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BelaSigna 200

1.0 General Description

BelaSigna 200 is

a high-performance, programmable, mixed-signal digital signal processor (DSP) that is based on

ON Semiconductor’s patented second-generation SignaKlara™ technology.

This single-chip solution is ideally suited for embedded applications where audio performance, low power consumption and

miniaturization are critical. BelaSigna 200 targets a wide variety of digital speech- and audio-centric applications, including:

Communication headsets

Smart phones

Personal digital assistants (PDAs)

Hands-free car kits

Bluetooth™ wireless technology systems

BelaSigna 200 provides numerous analog and digital interfaces including parallel, serial, synchronous, and asynchronous interfaces to

facilitate the connection with transducers from various applications.

BelaSigna 200 contains two primary processing blocks, which all work together to provide a complete audio processing chain. The

analog section includes two 16-bit A/D converters and two 16-bit D/A converters. Two on-chip direct digital output stages allow

BelaSigna 200 to drive various output transducers directly, eliminating the need for external power amplifiers.

BelaSigna 200 features internal clock generation and power regulation for excellent noise and power performance. Two DSP

subsystems operate concurrently: the RCore, which is a fully programmable DSP core, and the weighted overlap-add (WOLA)

filterbank coprocessor, which is a dedicated, configurable processor that executes time-frequency domain transforms and other vector-

based computations. In addition to these processors, there are several other peripherals, which optimize the architecture to audio

processing, such as the onput/output processor (IOP) – an audio-targeted direct memory access (DMA) processor, which runs in the

background and manages the data flow between the converters and the two processors. The BelaSigna 200 functional block diagram is

shown in Figure 1.

Figure 1: BelaSigna 200 Functional Block Diagram

June 2008 – Rev. 16

Publication Order Number:

BELASIGNA200/D

BelaSigna 200

2.0 Key Features

2.1 System

• 16-bit programmable fixed-point DSP core

• Configurable WOLA filterbank coprocessor optimized for filterbank calculations

• 12-Kword program memory (PRAM)

• Two 4-Kword data memories (XRAM and YRAM)

• Two 384-word dual-port FIFO memories

• Two 128-word dual-port 18-bit memories dedicated to WOLA output results

• 576-word memory dedicated to WOLA gain values, WOLA windows and other configuration data

• Internal oscillator

• Operating voltage of 1.8V nominal

• Ultra-low power: less than 1mW @ 1.28MHz system clock frequency, 1.8V nominal operating voltage, both processors running

• Available in a QFN package; other packages available upon request

2.2 RCore DSP

• Dual-Harvard architecture, 16-bit programmable fixed-point DSP with three execution units

• Single-cycle multiply-accumulate (MAC) with 40-bit accumulator

• Highly parallel instruction set with powerful addressing modes

• Flexible address generation (including modulo addressing) for accessing program memory and data memories, plus control and

configuration registers

• Separate system and user stacks with dedicated stack pointers

• Fast normalization and de-normalization operations optimized for signal level calculation and block-floating point calculations

• Supports time-domain pre- and post-processing of input data stream and frequency-domain processing of WOLA output

• Master processor for entire system

2.3 WOLA Filterbank Coprocessor

• Mono and stereo time-frequency transforms providing real or complex data results

• Standard library of overlap-add (OLA) and WOLA filterbank configurations

o

Configurable number of frequency bands

Configurable oversampling and decimation factors

Configurable windows

• Low group delay (< 4ms for 16 bands possible)

• Fast real and complex gain application for magnitude and phase processing

• Block floating-point calculations (4-bit exponent, 18-bit mantissa) to achieve high fidelity

• Maximum digital gain of 90dB possible

• High-fidelity time-frequency domain processing

• Low-overhead interaction with the RCore through shared memories, control registers and interrupts

2.4 Input Output Processor (IOP)

• Block-based DMA for all audio data provides automatic management of input and output FIFOs that reduces processor overhead

• Mono (one in, one out), simple stereo (two in, one out), full stereo (two in, two out) and digital mixed (two in, one out) operating

modes

• Interacts with the RCore through interrupts and shared memories

• Normal and smart FIFO audio data accessing schemes available

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BelaSigna 200

2.5 Input Stage

• Two separate input channels, each with two multiplexed inputs

• Two configurable preamplifiers for improved input dynamic range matching

• Two analog third-order anti-aliasing filters

• Two 16-bit oversampling ΣΔ A/D converters

• Two ninth-order low-delay wave digital filters (WDFs) for decimation and DC removal with configurable digital gains for optimal

channel matching

2.6 Output Stage

• Two output channels (full stereo)

• Two 16-bit oversampling ΣΔ D/A converters

• Two line-level analog outputs

• Two configurable output attenuators for improved output dynamic range matching

• Two analog third-order anti-aliasing filters

• Two pulse-density modulation (PDM)-based direct digital outputs capable of driving low-impedance loads

2.7 Peripherals and Interfaces

2.7.1. Analog Interfaces

• Six external low-speed A/D converter (LSAD) inputs can be used with analog trimmers (e.g., potentiometers, analog switches, etc.)

• Two internal LSAD inputs tied directly to ground and supply can be used for supply monitoring

2.7.2. Digital Interfaces

• 16-pin general-purpose I/O (GPIO) interface

• Serial peripheral interface (SPI) communications port with interface speeds up to 640kbps at 1.28MHz system clock

• Pulse-code modulation (PCM) interface for high-bandwidth digital audio I/O

• Configurable RS-232 universal asynchronous receiver/transmitter (UART)

• RS-232-based communications port for debugging and in-circuit emulation

• Two-wire synchronous serial (TWSS) interface with speeds up to 100kbps at 1.28MHz system clock and up to 400kbps at higher

system clocks (slave mode support only)

2.7.3. System

• Integrated watchdog timer

• General-purpose timer

• External clock input division circuitry to support a wide range of external clock speeds

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BelaSigna 200

3.0 BelaSigna 200 Design and Layout Strategies

BelaSigna 200 is designed to allow both digital and analog processing in a single system. Due to the mixed-signal nature of this

system, the design of the printed circuit board (PCB) layout is critical to maintain the high audio fidelity of BelaSigna 200. To avoid

coupling noise into the audio signal path, keep the digital traces away from the analog traces. To avoid electrical feedback coupling,

isolate the input traces from the output traces.

3.1 Recommended Ground Design Strategy

The ground plane should be partitioned into two: the analog ground plane (AGND) and the digital ground plane (DGND). These two

planes should be connected together at a single point, known as the star point. The star point should be located at the ground terminal

of a capacitor on the output of the power regulator as illustrated in Figure 2.

Figure 2: Schematic of Ground Scheme

The DGND plane is used as the ground return for digital circuits and should be placed under digital circuits.

The AGND plane should be kept as noise-free as possible. It is used as the ground return for analog circuits and it should surround

analog components and pins. It should not be connected to or placed under any noisy circuits such as RF chips, switching supplies or

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BelaSigna 200

digital pads of BelaSigna 200 itself. Analog ground returns associated with the audio output stage should connect back to the star point

on separate individual traces.

For more information on the recommended ground design strategy, see Table 1.

In some designs, space constraints may make separate ground planes impractical. In this case a star configuration strategy should be

used. Each analog ground return should connect to the star point with separate traces.

3.2 Internal Power Supplies

Power management circuitry in BelaSigna 200 generates separate digital (VDDC) and analog (VREG, VDBL) regulated supplies. Each

supply requires an external decoupling capacitor, even if the supply is not used externally. Decoupling capacitors should be placed as

close as possible to the power pads. Further details are provided in Table 1. Non-critical signals are outlined in Table 2.

Table 1: Critical Signal

Pin Name

Description

Routing Guideline

Place 1μF (min) decoupling capacitor close to pin. Connect negative

terminal of capacitor to DGND plane.

VBAT

Power supply

Place separate 1μF decoupling capacitors close to each pin. Connect

negative capacitor terminal to AGND. Keep away from digital traces and

output traces. VREG may be used to generate microphone bias. VDBL

shall not be used to supply external circuitry.

Internal regulator for analog

sections

VREG, VDBL

AGND

VDDC

Analog ground return

Connect to AGND plane.

Place 10μF decoupling capacitor close to pin. Connect negative terminal

of capacitor to DGND. Should be connected to VDDO pins and to

EEPROM power.

Internal regulator for digital

sections

Digital ground return (pads and

core)

GNDO, GNDC

Connect to digital ground.

Keep as short as possible. Keep away from all digital traces and audio

outputs. Avoid routing in parallel with other traces. Connect unused inputs

to AGND.

Microphone inputs

AI0, AI1 / LOUT, AI2, AI3

Connect to AGND. If no analog ground plane, should share trace with

microphone grounds to star point.

AIR

Input stage reference voltage

Analog audio output

AO0, AO1

Keep away from microphone inputs.

RCVR0+, RCVR0-, RCVR1+,

RCVR1-

Keep away from analog traces, particularly microphone inputs.

Corresponding traces should be of approximately the same length.

Direct digital audio output

AOR

Output stage reference voltage

Output stage ground return

Connect to star point. Share trace with power amplifier (if present).

Connect to star point.

RCVRGND

External clock input / internal

clock output

Minimize trace length. Keep away from analog signals. If possible,

surround with digital ground.

EXT_CLK

AI_RC

Infrared receiver input

If used, minimize trace length to photodiode.

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BelaSigna 200

Table 2: Non-Critical Signal

Pin Name

Description

Routing Guideline

CAP0, CAP1

Internal charge pump - capacitor connection

Place 100nF capacitor close to pins

Not critical

Connect to test points

DEBUG_TX, DEBUG_RX

Debug port

TWSS_SDA, TWSS_CLK

GPIO[14..0]

TWSS port

Not critical

General-purpose I/O

GPIO[15]

Determines voltage mode during boot. For 1.8V operation,

should be connected to DGND

Not critical

UART_RX, UART_TX

General-purpose UART

Not critical

PCM_FRAME, PCM_CLK, PCM_OUT,

PCM_IN

Pulse code modulation port

I2S_INA, I2S_IND, I2S_FA, I2S_FD,

I2S_OUTA, I2S_OUTD

Philips I²S compatible port

Not critical

DCLK

Programmable clock output

Low-speed A/D converters

If used, keep away from analog

inputs/outputs

LSAD[5..0]

Not critical

SPI_CLK, SPI_CS, SPI_SERI,

SPI_SERO

Serial peripheral interface port

Connect to EEPROM

Not critical

3.3 Audio Inputs

The audio input traces should be as short as possible. The input impedance of each audio input pad (e.g., AI0, AI1, etc.,) is high

(approximately 500kΩ); therefore a 10nF capacitor is sufficient to decouple the DC bias¹. Keep audio input traces strictly away from

output traces. Microphone ground terminals should be connected to the AGND plane (if present) or share a trace with the input ground

reference voltage pin (AIR) to the star point.

Analog and digital outputs MUST be kept away from microphone inputs.

3.4 Audio Outputs

The audio output traces should be as short as possible. If the direct digital output is used, the trace length of RCVRx+ and RCVRx-

should be approximately the same to provide matched impedances. If the analog audio output is used, the ground return for the

external power amplifier should share a trace with the output ground reference voltage pin (AOR) to the star point.

¹The capacitor and the internal resistance form a first-order analog high pass filter whose cutoff frequency can be calculated by f_3dB(Hz) = 1/(RC2π), which results with

~30Hz for 10nF capacitor.

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BelaSigna 200

4.0 Mechanical and Environmental Information

BelaSigna 200 is available in two packages:

•

The QFN package measures 8x8mm, has easy-to-probe signals and all I/O available.

The CSP package is the ultra-miniature option, measuring only 2.3x3.7mm; this package has reduced I/O and flexibility, but

still meets a wide range of application needs.

4.1 QFN Package Option

4.1.1. QFN Mechanical Information

Figure 3: QFN Mechanical Drawings

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BelaSigna 200

4.1.2. QFN Pad Out

Pad # Pad Name

Pad Function

Charge pump capacitor pin 0

Double voltage

Audio signal input to ADC0

Audio signal input to ADC0/line level output signal from preamp 0

Reference voltage for microphone

Audio signal input to ADC1

Regulated voltage for microphone bias

Analog ground

I/O

N/A

O

U/D

N/A

1

CAP0

2

VDBL

3

A|0

I

4

5

A|1/LOUT

A|R

I/O

N/A

I

O

N/A

I

N/A

O

6

A|2

7

A|3

8

9

10

11

12

13

VREG

AGND

AI_RC

AOR

AO1/RCVR1-

AO0/RCVR1+

Remote control input

Reference voltage for DAC

Audio signal output from DAC1/output from direct digital drive 1-

Audio signal output from DAC0/output from direct digital drive 1+

O

Pad # Pad Name

Pad Function

Positive power supply

Output from direct digital drive 0

Receiver return current

General-purpose I/O/clock divider reset/I2S interface

analog blocks frame output

General-purpose I/O/I2S interface analog blocks input

General-purpose I/O/I2S interface digital blocks frame

Digital pads supply input

I/O

I

O

N/A

U/D

N/A

14

15

16

17

VBAT

RCVR0-

RCVR0+

RCVRGND

GPIO[3]/

18

I/O

U

NCLK_DIV_RESET/I2S_FA

GPIO[2]/I2S_INA

GPIO[1]/I2S_IND

GPIO[0]/I2S_FD

VDDO

GNDO

EXT_CLK

DEBUG_RX

DEBUG_TX

19

20

21

22

23

24

25

26

I/O

I

N/A

I/O

I

U

N/A

U

Digital pads ground

External clock input/internal clock output

Debug port receive

U

Debut port transmit

O

Pad # Pad Name

Pad Function

I/O

N/A

I/O

I

N/A

O

U/D

N/A

U

27

28

29

30

31

32

33

34

35

36

37

38

39

RESERVED

TWSS_SDA

TWSS_CLK

GNDC

VDDC

SPI_SERO

SPI_SERI

SPI_CS

SPI_CLK

GPIO[15]

TWSS data

TWSS clock

Core logic ground

U

N/A

D

U

D

N/A

U

Core logic, EEPROM and pad supply output

Serial peripheral interface serial data out

Serial peripheral interface serial data in

Serial peripheral interface chip select

Serial peripheral interface clock

General-purpose I/O

General-purpose I/O/PCM interface frame

General-purpose I/O/PCM interface output

General-purpose I/O/PCM interface input

I/O

I

I/O

GPIO[14]/PCM_FRAME

GPIO[13]/PCM_OUT

GPIO[12]/PCM_IN

Pad # Pad Name

Pad Function

No connection

General-purpose I/O/PCM interface clock

Digital pads ground

I/O

N/A

I/O

N/A

I

U/D

N/A

U

N/A

U

40

41

42

43

44

45

N/C

GPIO[11]/PCM_CLK

GNDO

VDDO

Digital pads supply input

GPIO[10]/DCLK

General-purpose I/O/class D receiver clock

Low-speed A/D/general-purpose I/O/general-purpose

UART receive

Low-speed A/D input/general-purpose I/O/general-

purpose UART transmit

I/O

46

47

LSAD[5]/GPIO[9]/UART_RX

LSAD[4]/GPIO[8]/UART_TX

I/O

U

48

49

LSAD[3]/GPIO[7]

LSAD[2]/GPIO[6]

Low-speed A/D input/general purpose I/P

Low-speed A/D inputs/general-purpose I/O/I2S interface

analog blocks output

I/O

U

50

LSAD[1]/GPIO[5]/I2S_OUTA

I/O

U

Low-speed A/D inputs/general-purpose I/O/I2S interface

analog blocks output

Charge pump capacitor pin 1

51

52

LSAD[0]/GPIO[4]/I2S_OUTD

CAP1

I/O

U

N/A

Rev. 16 | Page 8 of 43 | www.onsemi.com

BelaSigna 200

4.1.3. QFN Environmental Characteristics

All parts supplied against this specification have been qualified as follows:

Table 3: Environmental Characteristics

Characteristics

Packaging Level

Moisture sensitivity level

JEDEC Level 3

30°C / 60% RH for 192 hours

121°C / 100% RH / 2 atm for 168 hours

-65°C to 150°C for 1000 cycles

130°C / 85% RH for 100 hours

150°C for 1000 hours

Pressure cooker test (PCT)

Thermal cycling test (TCT)

Highly accelerated stress test (HAST)

High temperature stress test (HTST)

Board Level

Temperature

Drop

-40°C to 125°C for 2500 cycles with no failures

1m height with no failures

Bending

1mm deflection / 2Hz

4.1.4. QFN Carrier Information

ON Semiconductor offers tape and reel packing for BelaSigna 200 QFN packages. The packing consists of a pocketed carrier tape, a

cover tape, and a molded anti-static polystyrene reel. The carrier and cover tape create an ESD safe environment, protecting the QFNs

from physical and electro-static damage during shipping and handling.

Reel Top View

Carrier Tape

ESD Label

Lokreel

Protective

Retainer

Q.A. Inspection

Passed Stamp

Reel Diameter: 13 inches

Quantity Per Reel: 500 pieces

Date Codes: Max. of two date codes can

be combined into one reel

Mfg. Packing Label

Figure 4: QFN Reel Format

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BelaSigna 200

All Dimensions in Millimeters

Ao = 8.3 mm

Bo = 8.3 mm

Ko = 2.0 mm

K1 = 1.0 mm

Figure 5: QFN Tape Dimensions

Notes:

1. 10 sprocket hole pitch cumulative tolerance ± 0.02.

2. Camber not to exceed 1 mm in 100 mm.

3. Material: PS+C.2.

4. Ao and Bo measured on a plane 0.3 mm above the bottom of the pocket.

5. Ko measured from a plane on the inside bottom of the pocket to the top surface of the carrier.

6. Pocket position relative to sprocket hole measured as true position of pocket, not pocket hole.

Figure 6: QFN Orientation in Tape

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BelaSigna 200

4.2 CSP Package Option

4.2.1. CSP Mechanical Information

Figure 7: CSP Mechanical Drawings

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BelaSigna 200

4.2.2. CSP Pad Out

Table 4: Pad Out (Advance Information)

Pad

Pad Name

Index

Pad Function

I/O

U/D

B2

A2

A1

C3

B3

B1

C2

C1

B4

C4

D1

E1

D2

D3

E3

D4

E2

E5

A6

E6

D6

E7

D7

E8

D8

C8

C7

B8

C6

A8

B7

A7

B6

A5

B5

CAP0

Charge pump capacitor pin 0

N/A

O

N/A

U

CAP1

Charge pump capacitor pin 1

VDBL

Double voltage

VREG

Regulated voltage for microphone bias

Audio signal input to ADC0

O

A|0

I

A|1/LOUT

A|2

Audio signal input to ADC0/line level output signal from preamp 0

Audio signal input to ADC1

I/O

I

A|3

Audio signal input to ADC1

I

A|R

Reference voltage for microphone

Analog ground

N/A

O

AGND

AOR

Reference voltage for DAC

AO1/RCVR1-

AO0/RCVR1+

RCVR0-

Audio signal output from DAC1/output from direct digital drive 1-

Audio signal output from DAC0/output from direct digital drive 1+

Output from direct digital drive 0

Receiver return current

O

RCVR0+

O

RCVRGND

VBAT

N/A

I

Positive power supply

VDD

Core logic, EEPROM and pad supply

Digital pads ground

I

GNDO

N/A

I/O

I

GNDC

Core logic and pads ground

EXT_CLK

DEBUG_RX

DEBUG_TX

TWSS_SDA

TWSS_CLK

SPI_SERO

SPI_SERI

SPI_CS

External clock input/internal clock output

Debug port receive

U

Debut port transmit

O

U

TWSS data

I/O

I

U

TWSS clock

U

Serial peripheral interface serial data out

Serial peripheral interface serial data in

Serial peripheral interface chip select

Serial peripheral interface clock

General-purpose I/O/PCM interface frame

General-purpose I/O/PCM interface output

General-purpose I/O/PCM interface input

General-purpose I/O/PCM interface clock

General-purpose I/O/class D receiver clock

Low-speed A/D/general-purpose I/O/general-purpose UART receive

I/O

I

D

U

I/O

D

SPI_CLK

N/A

U

GPIO[14]/PCM_FRAME

GPIO[13]/PCM_OUT

GPIO[12]/PCM_IN

GPIO[11]/PCM_CLK

GPIO[10]/DCLK

LSAD[5]/GPIO[9]/UART_RX

U

Low-speed A/D input/general-purpose I/O/general-purpose UART

transmit

A4

C5

A3

LSAD[4]/GPIO[8]/UART_TX

LSAD[3]/GPIO[7]

I/O

U

Low-speed A/D input/general purpose I/P

LSAD[1]/GPIO[5]/I2S_OUT

A

Low-speed A/D inputs/general-purpose I/O/I2S interface analog

blocks output

LSAD[0]/GPIO[4]/I2S_OUT

D

Low-speed A/D inputs/general-purpose I/O/I2S interface analog

blocks output

D5

E4

I/O

U

GPIO[3]/

NCLK_DIV_RESET/I2S_FA

General-purpose I/O/clock divider reset/I2S interface analog blocks

frame output

Rev. 16 | Page 12 of 43 | www.onsemi.com

BelaSigna 200

4.2.3. CSP Environmental Characteristics

All parts supplied against this specification have been qualified as follows:

Table 5:

Packaging Level

Moisture sensitivity level (MSL)

JEDEC Level 3

30°C / 60% RH for 192 hours

121°C / 100% RH / 2 atm for 168 hours

-65°C to 150°C for 1000 cycles

130°C / 85% RH for 100 hours

150°C for 1000 hours

Pressure cooker test (PCT)

Thermal cycling test (TCT)

Highly accelerated stress test (HAST)

High temperature stress test (HTST)

Board Level

Temperature

-40°C to 125°C for 1000 cycles with no failures

(for board thickness <40mils and underfilled CSP)

1m height with no failures

Drop

4.2.4. CSP Carrier Information

The devices will be provided in standard 7” Tape & Reel carrier with 5,000 parts per reel.

Note: all dimensions in millimeters

Figure 8: CSP Tape Dimensions

4.2.5. CSP Design Considerations

In order to achieve the highest level of miniaturization, the CSP package is constrained in ways that will factor into design decisions.

The CSP will only operate in HV mode, and therefore requires a 1.8V operating voltage. The number of pins is reduced to 40

(compared to 49 active pins on the QFN). This reduction eliminates access to GPIOs (0,1,2,6,15), LSAD 2, the I2S interface, and the IR

remote receiver.

For PCB manufacture with BelaSigna 200 CSP, ON Semiconductor recommends Solder-on-Pad (SoP) surface finish. With SoP, the

solder mask opening should be solder mask-defined and copper pad geometry will be dictated by the PCB vendor’s design

requirements.

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BelaSigna 200

Alternative surface finishes are ENiG and OSP; volume of screened solder paste (#5) should be less than 0.0008mm^3. If no pre-

screening of solder paste is used, then following conditions must be met:

(i) the solder mask opening should be >0.3mm in diameter,

(ii) the copper pad will have 0.25mm diameter, and

(iii) soldermask thickness should be less than 1mil thick above the copper surface.

ON Semiconductor can provide BelaSigna 200 CSP landpattern CAD files to assist your PCB design upon request.

Rev. 16 | Page 14 of 43 | www.onsemi.com

BelaSigna 200

5.0 Development Tools

5.1 Evaluation and Development Kit (EDK)

BelaSigna 200 is supported by a set of development tools included in the evaluation and development kit (EDK).

The EDK is intended for use by DSP software developers and hardware systems integrators. It consists of the following components:

• Hardware

•

BelaSigna 200 evaluation and development board (contains BelaSigna 200 device)

• Software

•

Complete assembly tool chain (assembler, linker, librarian, etc.)

Low-level hardware-specific libraries

Basic algorithm toolkit (BAT)

Basic operating system libraries (BOS)

WOLA windows and microcode

Real-time debugger

EEPROM file system manager

UltraEdit IDE

WOLA toolbox for Matlab for rapid application development and prototyping

BAT and BOS provide all the common processing routines in an easy-to-call macro structure. This streamlines the assembly level

coding by encapsulating redundant work, while maintaining the true efficiency of hardware-level coding.

For advanced DSP developers or application developers, ON Semiconductor provides an application development extension to the

EDK, which contains the following:

• Python language installer (version 2.2)

• The wxPython GUI toolkit

• Embedding toolkit (used to build standalone Python applications)

• ON Semiconductor extension

•

Python interface (pyLLCOM) to ON Semiconductor’s low-level communications library (LLCOM)

File I/O library (supports standard ON Semiconductor file formats)

EEPROM access library

DSH (ON Semiconductor Python Shell – standard command-line shell with customizations for BelaSigna 200)

5.2 BelaSigna 200 Rapid Prototyping Module

The rapid prototyping module (RPM) is fast and easy for designers to integrate with existing and future products that are not yet DSP-

enabled. It also allows for the quick implementation of field trials and rapid prototyping to evaluate the benefits of BelaSigna 200. The

RPM features BelaSigna 200 along with a 256-Kbit EEPROM for storing a variety of custom algorithms. On-board power regulation

circuitry allows the RPM to run off a wide variety of power supplies. A fast oscillator (included on the RPM) running at 24.576MHz

provides a choice of many sampling frequencies and can be enabled for when heavy-duty signal processing is required.

5.3 BelaSigna 200 Demonstrator

The BelaSigna 200 demonstrator lets device manufacturers quickly and easily assess the speech- and audio-centric benefits delivered

by BelaSigna 200 in a full-featured, self-contained portable unit. The demonstrator is housed in a durable, portable, lightweight package

complete with belt clip to facilitate demonstrations in the field. This tool can be easily utilized in real world scenarios to experience the

benefits of noise reduction, signal enhancement and a variety of other algorithms. The demonstrator can be connected to a wired

headset and function like a dongle to communicate with a Bluetooth mobile phone.

Contact your account manager for more information.

Rev. 16 | Page 15 of 43 | www.onsemi.com

BelaSigna 200

6.0 Architecture Overview

6.1 RCore DSP

The RCore is a 16-bit fixed-point, dual-Harvard-architecture DSP. It includes efficient normalize and de-normalize instructions, plus

support for double-precision operations to provide the additional dynamic range needed for many applications. All memory locations in

the system are accessible by the RCore using several addressing modes including indirect and circular modes. The RCore generally

assumes master functionality of the system.

6.1.1. RCore DSP Architecture

Internal Router

DCU

D_AUX_REG0

D_AUX_REG4

EXT3

D_INT_STATUS

D_INT_EBL

D_SYS_CTRL

X

Y

X_Bus

XRAM

MU

PH

PL

LC0

LC1

PCU

REP

X_AGU

R0

PCFG0

PCFG1

PCFG2

R1

R2

R3

CTRL

ALU

ST

Y_Bus

EXP

YRAM

PRAM

Y_AGU

PCFG4

Barrel

Shifter

AH

AE

AL

P_Bus

R4

R5

R6

R7

PCFG5

PCFG6

PC

Limiter

IMM/SIMM

Data registers

Internal Router

Figure 9: RCore Programming Model

The RCore is a single-cycle pipelined multiply-accumulate (MAC) architecture that feeds into a 40-bit accumulator complete with barrel

shifter for fast normalization and de-normalization operations. Program execution is controlled by a sequencer that employs a three-

stage pipeline (FETCH, DECODE, EXECUTE). Furthermore, the RCore incorporates pointer configuration registers for low cycle-count

address generation when accessing the three memories: program memory (PRAM), X data memory (XRAM) and Y data memory

(YRAM).

Rev. 16 | Page 16 of 43 | www.onsemi.com

BelaSigna 200

6.1.2. Instruction Set

The RCore instruction set can be divided into the following three classes:

1. Arithmetic and Logic Instructions

The RCore uses two's complement fractional as a native data format. Thus, the range of valid numbers is [-1; 1), which is represented

by 0x8000 to 0x7FFF. Other formats can be utilized by applying appropriate shifts to the data.

The multiplier takes 16-bit values and performs a multiplication every time an operand is loaded into either the X or Y register. A

number of instructions that allow loading of X and Y simultaneously and addition of the new product to the previous product (a MAC

operation), are available. Single-cycle MAC with data pointer update and fetch is supported.

The arithmetic logic unit (ALU) receives its input from either the accumpulator (AE|AH|AL) or the product register (PH|PL). Although the

RCORE is a 16-bit system, 32-bit additions or subtractions are also supported. Bit manipulation is also available on the accumulator as

well as operations to perform arithmetic or logic shifts, toggling of specific bits, limiting, and other functions.

2. Data Movement Instructions

Data movement instructions transfer data between RAM, control registers and the RCore’s internal registers (accumulator, PH, PL, etc).

Two address generators are available to simultaneously generate two addresses in a single cycle. The address pointers R0..2 and

R4..6 can be configured to support increment, decrement, add-by-offset, and two types of modulo-N circular buffer operations. Single-

cycle access to low X memory or low Y memory as well as two-cycle instructions for immediate access to any address are also

available.

3. Program Flow Control Instructions

The RCore supports repeating of both single-word instructions and larger segments of code using dedicated repeat instructions or

hardware loop counters. Furthermore, instructions to manipulate the program counter (PC) register such as calls to subroutines,

conditional branches and unconditional branches are also provided.

Rev. 16 | Page 17 of 43 | www.onsemi.com

BelaSigna 200

7.0 Instruction Set

Table 6: Instruction Set

Instruction

Description

Instruction

Description

ABS A [,Cond] [,DW]

ADD A, Reg [,C]

ADD A, (Rij) [,C]

ADD A, DRAM [,B]

Calculate absolute value of A on condition

Add register to A

DCMP

Compare PH | PL to A

DEC A [,Cond] [,DW]

DEC Reg [Cond]

DEC (Rij) [,Cond]

Decrement A on condition

Decrement register on condition

Decrement memory on condition

Add memory to A

Add (DRAM) to A

Subtract PH | PL from A,

update PH | PL on condition

ADD A, (Rij)p [,C]

Add program memory to A

DSUB [Cond] [,P]

ADD A, Rc [,C]

ADDI A, IMM [,C]

ADSI A, SIMM

Add Rc register to A

Add IMM to A

EOR A, Reg

Exclusive-OR register with AH to AH

Exclusive-OR memory with AH to AH

Exclusive-OR (DRAM) with AH to AH

EOR A, (Rij)

Add signed SIMM to A

EOR A, DRAM [,B]

Exclusive-OR program memory with

AH to AH

AND A, Reg

AND register with AH to AH

EOR A, (Rij)p

Exclusive-OR Rc register with AH to

AH

AND A, (Rij)

AND memory with AH to AH

EOR A, Rc

AND A, DRAM [,B]

AND A, (Rij)p

AND (DRAM) with AH to AH

EORI A, IMM

EOSI A, SIMM

Exclusive-OR IMM with AH to AH

Exclusive-OR unsigned SIMM with AH

to AH

AND program memory with AH to AH

AND A, Rc

AND Rc register with AH to AH

AND IMM with AH to AH

INC A [,Cond] [,DW]

INC Reg [,Cond]

INC (Rij) [,Cond]

LD Rc, Rc

Increment A on condition

ANDI A, IMM

ANSI A, SIMM

BRA PRAM [,Cond]

BREAK

Increment register on condition

Increment memory on condition

Load Rc register with Rc register

Load register with register

AND unsigned SIMM with AH to AH

Branch to new address on condition

Stop the DSP for debugging purposes

LD Reg, Reg

Push PC and branch to new address

on condition

CALL PRAM [,Cond] [,B]

LD Reg, (Rij)

Load register with memory

CLB A

Calculate the leading bits on A

Clear accumulator

LD (Rij), Reg

LD A, DRAM [,B]

LD DRAM, A [,B]

LD Rc, (Rij)

Load memory with register

Load A with (DRAM)

CLR A [,DW]

CLR Reg

Clear register

Load (DRAM) with A

CMP A, Reg [,C]

CMP A, (Rij) [,C]

CMP A, DRAM [,B]

CMP A, (Rij)p [,C]

Compare register to A

Compare memory to A

Compare (DRAM) to A

Compare program memory to A

Load Rc register with memory

Load memory with Rc register

Load register with program memory

Load program memory with register

LD (Rij), Rc

LD Reg, (Rij)p

LD (Rij)p, Reg

Load register with program memory via

register

CMP A, Rc [,C]

Compare Rc register to A

LD Reg, (Reg)p

CMPI A, IMM [,C]

CMSI A, SIMM

Compare IMM to A

LD Reg, Rc

LD Rc, Reg

LDI Reg, IMM

Load register with Rc register

Load Rc register with register

Load register with IMM

Compare signed SIMM to A

Calculate logical inverse of A on condition

CMPL A [,Cond] [,DW]

Add PH | PL to A, update PH | PL

on condition

DADD [Cond] [,P]

DBNZ0/1 PRAM

LDI Rc, IMM

Load Rc register with IMM

Load memory with IMM

Branch to new address if LC0/1 <> 0

LDI (Rij), IMM

Rev. 16 | Page 18 of 43 | www.onsemi.com

BelaSigna 200

Table 7: Instruction Set Continued

Instruction

Description

Instruction

Description

Load loop counter with 8-bit unsigned

SIMM

LDLC0/1 SIMM

PUSH IMM [,B]

Push IMM on stack

Repeat next instruction n+1 times

(9-bit unsigned)

LDSI A, SIMM

LDSI Rij, SIMM

Load A with signed SIMM

REP n

Load pointer register with unsigned

SIMM

REP Reg

Repeat next instruction Reg+1 times

MLD (Rj), (Ri) [,SQ]

MLD Reg, (Ri) [,SQ]

MODR Rj, Ri

Multiplier load and clear A

Pointer register modification

Multiplier load and accumulate

REP (Rij)

RES Reg, Bit

RES (Rij), Bit

RET [B]

Repeat next instruction (Rij)+1 times

Clear bit in register

Clear bit in memory

MPYA (Rj), (Ri) [,SQ]

MPYA Reg, (Ri) [,SQ]

Return from subroutine

Round A with AL

RND A

Multiplier load and accumulate

negative

Multiplier load and accumulate

negative

MPYS (Rj), (Ri) [,SQ]

MPYS Reg, (Ri) [,SQ]

SET Reg, Bit

SET (Rij), Bit

Set bit in register

Set bit in memory

MSET (Rj), (Ri) [,SQ]

MSET Reg, (Ri) [,SQ]

Multiplier load

SET_IE

SHFT n

Set interrupt enable flag

Shift A by +/- n bits (6-bit signed)

Update A and/or PH | PL with X*Y on

condition

Calculate negative value of A on

condition

MUL [Cond] [,A] [,P]

NEG A [,Cond] [,DW]

SHFT A [,Cond] [,INV]

SLEEP [IE]

Shift A by EXP bits on condition

Sleep

NOP

No operation

SUB A, Reg [,C]

SUB A, (Rij) [,C]

SUB A, DRAM [,B]

SUB A, (Rij)p [,C]

SUB A, Rc [,C]

SUBI A, IMM [,C]

SUSI A, SIMM

SWAP A [,Cond]

TGL Reg, Bit

Subtract register from A

Subtract memory from A

Subtract (DRAM) from A

Subtract program memory from A

Subtract Rc register from A

Subtract IMM from A

OR A, Reg

OR register with AH to AH

OR memory with AH to AH

OR (DRAM) with AH to AH

OR program memory with AH to AH

OR Rc register with AH to AH

OR IMM with AH to AH

OR A, (Rij)

OR A, DRAM [,B]

OR A, (Rij)p

OR A, Rc

ORI A, IMM

ORSI A, SIMM

POP Reg [,B]

POP Rc [,B]

PUSH Reg [,B]

PUSH Rc [,B]

Subtract signed SIMM from A

Swap AH, AL on condition

Toggle bit in register

OR unsigned SIMM with AH to AH

Pop register from stack

Pop Rc register from stack

Push register on stack

TGL (Rij), Bit

Toggle bit in memory

TST Reg, Bit

Test bit in register

Push Rc register on stack

TST (Rij), Bit

Test bit in memory

Table 8: Notation

Symbol

Meaning

Accumulator update

Memory bank selection (X or Y)

Symbol

Meaning

A

B

INV

Inverse shift

P

PH | PL update

Program memory address (16 bits)

C

Carry bit

PRAM

Cond

DRAM

Condition in status register

Rc

Rc register (R0..7, PCFG0..2, PCFG4..6, LC0/1)

Data register (AL, AH, X, Y, ST, PC, PL, PH, EXT0, EXP, AE,

EXT3..EXT7)

Low data (X or Y) memory address (8 bits)

Reg

DW

IE

Double word

Ri / Rj / Rij

SIMM

Pointer to X / Y / either data memory

Short immediate data (10 bits)

Square

Interrupt enable flag

Immediate data (16 bits)

IMM

SQ

Rev. 16 | Page 19 of 43 | www.onsemi.com

BelaSigna 200

7.1 Weighted Overlap-Add (WOLA) Filterbank Coprocessor

The WOLA coprocessor performs low-delay, high-fidelity filterbank processing to provide efficient time-frequency processing. The

coprocessor stores intermediate data values, program code and window coefficients in its own memory space. Audio data are

accessed directly from the input and output FIFOs where they are automatically managed by the IOP.

The WOLA coprocessor can be configured to handle different sizes and types of transforms, such as mono, simple stereo or full stereo

configurations. The number of bands, the stacking mode (even or odd), the oversampling factor, and the shape of the analysis and

synthesis windows used are all configurable. The selected set of parameters affects both the frequency resolution, the group delay

through the WOLA coprocessor and the number of cycles needed for complete execution.

The WOLA coprocessor can generate both real and complex data. Either real or complex gains can be applied. The RCore always has

access to these values through shared memories. All parameters are configurable with microcode, which is used to control the WOLA

during execution.

The RCore initiates all WOLA functions (analysis, gain applications, synthesis) through dedicated control registers. A dedicated

interrupt is used to signal completion of a WOLA function.

Many standard WOLA microcode configurations are delivered with the EDK. These configurations have been specially designed for low

group delay and high fidelity.

7.2 Input Output Processor (IOP)

The IOP is an audio-optimized configurable DMA unit for audio data samples. It manages the collection of data from the A/D converters

to the input FIFO and feeds digital data to the audio output stage from the output FIFO. The IOP can be configured to access data in

the FIFOs in four different ways:

• Mono mode: Input samples are stored sequentially in the input FIFO. Output samples are stored sequentially in the output FIFO.

• Simple stereo mode: Input samples from the two channels are stored interleaved in the input FIFO. Output samples for the single

output channel are stored in the lower part of the output FIFO.

• Digital mixed mode: Input samples from the two channels are stored in each half of the input FIFO. Output samples for the single

output channel are stored in the lower half of the output FIFO.

• Full stereo mode: Input samples from the two channels are stored interleaved in the input FIFO. Output samples for the two output

channels are stored interleaved in the output FIFO. (Note: A one-in, two-out configuration can be achieved in this mode by leaving

the second input unused).

Figure 10: Four Audio Modes

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BelaSigna 200

The IOP places and retrieves FIFO data in memories shared with the RCore. Each FIFO (input and output) has two memory interfaces.

The first corresponds with the normal FIFO. Here the address of the most recent input block changes as new blocks arrive. The second

corresponds with the Smart FIFO. In this scheme the address of the most recent input block is fixed. The smart FIFO interface is

especially useful for time-domain filters.

In the case where the WOLA and the IOP no longer work together as a result of a low battery condition, an IOP end-of-battery-life auto-

mute feature is available.

7.3 General-Purpose Timer

The general-purpose timer is a 12-bit countdown timer with a 3-bit prescaler that interrupts the RCore when it reaches zero. It can

operate in two modes, single-shot or continuous. In single-shot mode the timer counts down only once and then generates an interrupt.

It will then have to be restarted from the RCore. In continuous mode the timer restarts with full timeout setting every time it hits zero and

interrupts are generated continuously. This unit is often useful in scheduling tasks that are not part of the sample-based signal

processing scheme, such as checking a battery voltage, or reading the value of a volume control.

7.4 Watchdog Timer

The watchdog timer is a configurable hardware timer that operates from the system clock and is used to prevent unexpected or

unstable system states. It is always active and must be periodically acknowledged as a check that an application is still running. Once

the watchdog times out, it generates an interrupt. If left to time out a second consecutive time without acknowledgement, a system reset

will occur.

7.5 RAM and ROM

There are 20 Kwords of on-chip program and data RAM on BelaSigna 200. These are divided into three entities: a 12-Kword program

memory, and two 4-Kword data memories ("X" and "Y" as are common in a dual-Harvard architecture).

There are also three RAM banks that are shared between the RCore and WOLA coprocessor. These memory banks contain the input

and output FIFOs, gain tables for the WOLA coprocessor, temporary memory for WOLA calculations, WOLA coprocessor results, and

the WOLA coprocessor microcode.

There is a 128-word lookup table (LUT) ROM that contains log₂(x), 2^x, 1/x and sqrt(x) values, and a 1-Kword ProgramROM that is used

during booting and configuration of the system.

Complete memory maps for BelaSigna 200 are shown in Figure 11.

Rev. 16 | Page 21 of 43 | www.onsemi.com

BelaSigna 200

Figure 11: Memory Maps

7.6 Interrupts

The RCore DSP has a single interrupt channel that serves eleven interrupt sources in a prioritized manner. The interrupt controller also

handles interrupt acknowledge flags. Every interrupt source has its own interrupt vector. Furthermore, the priority scheme of the

interrupt sources can be modified. Refer to Table 9 for a description of all the interrupts.

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BelaSigna 200

Table 9: Interrupts

Interrupt

Description

WOLA_DONE

IO_BLOCK_FULL

PCM

WOLA function done

IOP interrupt

PCM interface interrupt

UART_RX

General-purpose UART receive interrupt

General-purpose UART transmit interrupt

General-purpose timer interrupt

Watchdog timer interrupt

UART_TX

GP_TIMER

WATCHDOG_TIMER

SPI_INTERFACE

TWSS_INTERFACE

EXT3_RX

SPI interface interrupt

TWSS interface interrupt

EXT3 register receive interrupt

EXT3 register transmit interrupt

EXT3_TX

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BelaSigna 200

8.0 Description of Analog Blocks

8.1 Input Stage

The analog audio input stage is comprised of two individual channels. For each channel, one of two possible inputs is routed to the

input of the programmable preamplifier that can be configured for bypass or gain values of 12 to 30dB (3-dB steps).

The analog signal is filtered to remove frequencies above 10kHz before it is passed into the high-fidelity 16-bit oversampling ΣΔ A/D

converter. Subsequently, any necessary sample rate decimation is performed to downsample the signal to the desired sampling rate.

During decimation the level of the signal can be adjusted digitally for optimal gain matching between the two input channels. Any

undesired DC component can be removed by a configurable DC-removal filter that is part of the decimation circuitry. The DC removal

filter can be bypassed or configured for cut-off frequencies at 5, 10 and 20Hz.

A built-in feature allows a sampling delay to be configured between channel zero and channel one. This is useful in beam-forming

applications.

For power consumption savings either of the input channels can be disabled via software.

Figure 12: Input Stage

8.2 Output Stage

The analog audio output stage is composed of two individual channels. The first part of the output stage interpolates the signal for

highly oversampled D/A conversion and automatically configures itself for the desired oversampling rate. Here, the signal is routed to

both the ΣΔ D/A converter and the direct digital outputs. The D/A converter translates the signal into a high-fidelity analog signal and

passes it into a reconstruction filter to smooth out the effects of sampling. The reconstruction filter has a fixed cut-off frequency at

10kHz.

From the reconstruction filter, the signal passes through the programmable output attenuator, which can adjust the signal for various

line-level outputs or mute the signal altogether. The attenuator can be bypassed or configured to a value in the interval -12 to -30dB (3-

dB steps).

The direct digital output provides a bridge driven by a pulse-density modulated output that can be used to directly drive an output

transducer without the need for an external power amplifier.

Rev. 16 | Page 24 of 43 | www.onsemi.com

BelaSigna 200

Two analog outputs designed to drive external amplifiers are also available.

Figure 13: Output Stage

8.3 Clock-Generation Circuitry

BelaSigna 200 operates with two main clock domains: a domain running on the system clock (SYS_CLK) and a domain running on the

main clock (MCLK). SYS_CLK can either be internally generated or externally delivered. It is used to drive all on-chip processors such

as the RCore, the WOLA coprocessor and the IOP. MCLK is generated by division of SYS_CLK and is used to drive all A/D converters,

D/A converters and external interfaces (except SPI, PCM, I²S, and GPIO interfaces). The division factor used to create the desired

MCLK from SYS_CLK is configurable to support external clocks with a wide range of frequencies.

The sampling frequency of all A/D converters and D/A converters also depends on MCLK. When MCLK is 1.28MHz, sampling

frequencies in the interval 10.7kHz to 20kHz can be selected. Sampling frequencies up to 60kHz can be obtained with other MCLK

frequencies.

8.4 Battery Monitor

A programmable on-chip battery monitor is available for power management. The battery monitor works by incrementing a counter

value every time the battery voltage goes below a desired, configurable threshold value. This counter value can be used in an

application-specific power-management algorithm running on the RCore. The RCore can initiate any desired actions in case the battery

hits a predetermined value.

8.5 Multi-Chip Sample Clock Synchronization

BelaSigna 200 allows MCLK synchronization between two or more BelaSigna 200 chips connected in a multi-chip configuration.

Samples on multiple chips occur at the same instant in time. This is useful in applications using microphone arrays where synchronous

sampling is required. The sample clock synchronization is enabled using a control bit and a GPIO assignment that brings all MCLKs

across chips to zero phase at the same instant in time.

Rev. 16 | Page 25 of 43 | www.onsemi.com

BelaSigna 200

9.0 External Interfaces

9.1 External Digital Interfaces

9.1.1. Pulse-Code Modulation Interface (PCM I/F)

The PCM interface is a bi-directional, four-wire synchronous serial interface suitable for high-speed digital audio transfer. This

externally-clocked interface is capable of sending data serially at rates up to the clock speed of the RCore, providing the necessary

bandwidth for digital audio. This interface can also be used for a number of other functions, including multi-processing BelaSigna 200

chips. The interface is configurable for glueless connections to four-wire PCM interfaces as well as other BelaSigna 200 chips in a

BelaSigna 200 multi-chip configuration. Both master and slave modes are supported. The interface is configured via a memory-mapped

configuration register and interacts with the RCore through memory-mapped control registers and interrupts. Refer to Section 12.1 for

timing specifications.

9.1.2. General-Purpose Input/Output (GPIO)

Up to 16 GPIO pins are available to be configured as inputs or as outputs. All GPIO pins are pulled up internally. Data are read or

written via a memory-mapped control register. GPIO pins can be used to interface to digital switches, other devices, etc. The direction

of each bit is programmable via a direction register. Refer to Section 12.2 for timing specifications.

9.1.3. Serial Peripheral Interface (SPI) Port

The SPI port allows BelaSigna 200 to communicate synchronously with other devices such as external memory or EEPROM. This SPI

interface conforms to the standard SPI bus protocol supporting modes zero and two as a master, and transfer speeds up to half the

system clock frequency. The interface is configured via a memory-mapped configuration register and interacts with the RCore through

memory-mapped control registers and interrupts. Refer to Section 12.3 for timing specifications.

9.1.4. RS-232 Universal Asynchronous Receiver/Transmitter (UART)

The general-purpose UART is a low-voltage RS-232-compatible interface. All data are transmitted and received with eight data bits, no

parity and one stop bit (8N1). A range of standard data rates, up to a maximum of 115.2kbps, is supported. The interface is configured

via a memory-mapped configuration register and interacts with the RCore through memory-mapped control registers and interrupts.

9.1.5. Debug Port

The debug port is also a low-voltage RS-232-based UART, and it interfaces directly to the program controller. This interface differs from

the general-purpose UART in its access path to the RCore. It is used primarily by the evaluation and development tools to interface to,

program and debug BelaSigna 200 applications. Data rates up to 115.2kbps are supported. The protocol uses eight data bits, no parity

and one stop bit (8N1).

9.1.6. Two-Wire Synchronous Serial (TWSS) Interface

This industry standard two-wire high-speed synchronous serial interface allows communication to a variety of other integrated circuits

and memories. On BelaSigna 200, this interface operates in slave mode only. Data rates up to 400kbps are supported for MCLK

frequencies higher than 1.28MHz; for lower MCLK frequencies, the maximum rate is 100kbps. The interface is configured via memory

mapped configuration registers and interacts with the RCore through memory-mapped control registers and interrupts. The TWSS

interface is compatible with the Philips' I²C protocol.

9.1.7. I²S Interface

This industry standard digital audio interface uses a three-wire serial protocol to transmit and receive audio between BelaSigna 200 and

other systems. The interface operates at the system clock frequency and BelaSigna 200 always assumes master functionality.

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BelaSigna 200

9.2 External Analog Interfaces

9.2.1. Low-Speed A/D Converters (LSAD)

Six LSAD inputs are available on BelaSigna 200. Combined with two internal LSAD inputs (supply and ground) this gives a total of eight

multiplexed inputs to the LSAD converter. The multiplexed inputs are sampled sequentially at 1.6kHz per channel. The native data

format for the LSAD is 10-bit two's complement. However, a total of eight operation modes are provided that allow a configurable input

dynamic range in cases where certain minimum and maximum values for the converted inputs are desired; such as in the case of a

volume control where only input values up to a certain magnitude are allowed.

Rev. 16 | Page 27 of 43 | www.onsemi.com

BelaSigna 200

10.0 Boot Sequence

BelaSigna 200 boots in a two-stage boot sequence. The ProgramROM begins loading the bootloader from an external SPI EEPROM

200ms after power is applied to the chip. In this process the ProgramROM checks the EEPROM file structure to ensure validity. If the

file structure is validated, the bootloader is written to PRAM. In case of an error while reading the external EEPROM, all outputs are

muted. The system will then reset due to a watchdog timeout.

Once the bootloader is loaded into PRAM the program counter is set to point to the beginning of the bootloader code. Subsequently,

the signal-processing application that is stored in the EEPROM is downloaded to PRAM by the bootloader. The boot process generally

takes less than one second. ON Semiconductor provides a standard full-featured bootloader.

An alternative to bootloading is often used in development - program code can be loaded through the debug port after powering

BelaSigna 200. In this case, an SPI EEPROM may or may not be attached, and the debug port takes over control of the system. Some

products use this technique when an EEPROM is not suitable to the application.

Rev. 16 | Page 28 of 43 | www.onsemi.com

BelaSigna 200

11.0 Electrical Characteristics

11.1 Absolute Maximum Ratings

Table 10: Absolute Maximum Ratings

Parameter

Min.

Max.

2.0

Unit

V

Supply voltage

Operating temperature range²

Storage temperature range

Voltage at any input pin

-40

-55

-0.3

85

°C

V

125

2.1

Caution: Class 2 ESD sensitivity, JESD22-A114-B (2000V)

11.2 Electrical Characteristics

Conditions: Temperature = 25°C, f_{SYS_CLK}= 1.28MHz (internal), f_MCLK= 1.28MHz, f_SAMP= 16kHz, V_bat= 1.8V

Table 11: Electrical Characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Overall (1µF VBAT external capacitor)

Supply voltage

Vbat

Ibat

1.03

1.25

650

1.8

V

Current consumption⁴

VREG (1µF external capacitor)

Regulated output

PSRR

Vbat = 1.8V

μA

VREG

Ireg

unloaded

@ 1kHz

0.9

35

1.0

50

1.1

V

dB

Load current

2

18

5

mA

Load regulation

12

2

mV/mA

mV/V

Line regulation

VDBL (1µF external capacitor)

Regulated output

PSRR

VDBL

Ireg

1.8

2.0

45

2.2

V

dB

@ 1kHz

Load current

2

200

8

mA

Charge pump cap

= 100nF

Load regulation

130

5

mV/mA

mV/V

Line regulation

VDDC (1µF external capacitor)

HV output

HV

HV mode

Vbat

V

²Audio performance parameters may degrade outside the range of 0 to 70 degrees C. Internal oscillator speed will vary with temperature

³Device will operate down to 0.9V but with degraded system specifications

⁴DSP core active; single channel; direct digital output enabled and connected to 100kΩ resistance

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BelaSigna 200

11.3 Analog Characteristics

Conditions: Temperature = 25°C, f_{SYS_CLK}= 1.28MHz (internal), f_MCLK= 1.28MHz, f_SAMP= 16kHz, V_bat= 1.8V

Table 12: Analog Characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Input Stage

AI0, AI1, AI2, AI3 inputs

0dB preamp gain

Preamplifier gain 12, 15, 18, 21,

24, 27, 30dB

Unweighted, 20Hz to 8kHz BW,

30dB preamp gain

Unweighted, 20Hz to 8kHz BW,

0dB preamp gain

Input voltage

Vin

Rin

IRN

-1

1

Vp

kΩ

Input impedance⁵

Input referred noise

Input dynamic range

385

550

3

715

μVrms

dB

85

Unweighted, 20Hz to 8kHz BW,

0dB preamp gain,

input at 1 kHz

Input THD+N

-60

dB

Preamplifier gain tolerance

(0, 12, 15, 18, 21, 24, 27, 30dB)

50% re. FS input at 1kHz

-1.5

-1

1.5

1

Output Stage

Line out output level

Line out output impedance

Vlo

Rlo

AI1

Vp

5

kΩ

AO0. Attenuator = 12, 15, 18, 21,

24, 27, 30dB

Output impedance⁶

Rao

8.9

12.8

16.6

kΩ

Unweighted, 100Hz to 22kHz BW,

0dB output attenuation

Unweighted, 100Hz to 22kHz BW,

0dB output attenuation,

input at 1kHz

Output dynamic range

75

dB

Output THD+N

-60

dB

Output attenuator tolerance

(0,12,15,18,21,24,27,30dB)

50% re. FS input at 1kHz

-2

2

Low-Speed A/D

Input voltage

Peak input voltage, HV mode

-0.3

2.1

V

All channels sequentially

MCLK = 1.28MHz

Sampling frequency

Channel frequency

12.8

1.6

kHz

8 channels

Anti-Aliasing Filters (Input and Output)

Cut-off frequencies

7

10

80

13

1

kHz

dB

Passband flatness

-1

Stopband attenuation

dB

⁵Depends slightly on the preamp gain

⁶Depends strongly on the attenuator

Rev. 16 | Page 30 of 43 | www.onsemi.com

BelaSigna 200

11.4 Digital Characteristics

Conditions: Temperature = 25°C, f_{SYS_CLK}= 1.28MHz (internal), f_MCLK= 1.28MHz, f_SAMP= 16kHz, V_bat= 1.8V

Table 13: Digital Characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Output Stage

Direct digital output load current

Direct digital output resistance

Ido

25

20

mA

Rdo

10

77

Ω

Direct digital output 0 dynamic

range

Unweighted, 100Hz to 22kHz BW

dB

Unweighted, 100Hz to 10kHz BW

input at 1kHz

Unweighted, 100Hz to 22kHz BW

Direct digital output 0 THD+N

-63

75

Direct digital output 1 dynamic

range

Unweighted, 100Hz to 10kHz BW

input at 1kHz

Direct digital output 1 THD+N

-62

Internal Oscillator Characteristics

Clock frequency (internal)

Oscillator jitter

f_{SYS_CLK}

1.28

0.4

MHz

ns

1.0

Oscillator start-up voltage

0.55

0.7

0.85

V

Time required for frequency change

of ±20%

Oscillator settling time

1

ms

Other

f_{SYS_CLK}

VIH⁷

Clock frequency (external)

High-level input voltage

Low-level input voltage

HV mode

33

2.0

MHz

V

1.45

1.8

0

VIL⁷

0.35

V

High-level output voltage

Rout = 50ohm

Low-level output voltage

Rout = 50ohm

Input capacitance

(digital I/O pads)

Output capacitance

(digital I/O pads)

VOH⁷

Isource = 1mA

Isink = 1mA

1.8

V

VOL

0.05

0.1

5

CIN

pF

COUT

Maximum load

100

Pull-up resistors

Rup

215

430

645

KΩ

kΩ

Pull-down resistors

Rdown

⁷Digital low (0) represented below 20% of Vbat. Digital high (1) represented above 80% of Vbat.

Rev. 16 | Page 31 of 43 | www.onsemi.com

BelaSigna 200

12.0 Timing Diagrams

12.1 PCM Interface Timing Diagrams

12.1.1. 16-bit

Figure 14: LSB Advanced Short

Figure 15: LSB Advanced Wide

Rev. 16 | Page 32 of 43 | www.onsemi.com

BelaSigna 200

Figure 16: LSB Del Short

Figure 17: LSB Del Wide

Rev. 16 | Page 33 of 43 | www.onsemi.com

BelaSigna 200

Figure 18: MSB Advanced Short

Figure 19: MSB Advanced Wide

Rev. 16 | Page 34 of 43 | www.onsemi.com

BelaSigna 200

Figure 20: MSB Del Short

Figure 21: MSB Del Wide

Rev. 16 | Page 35 of 43 | www.onsemi.com

BelaSigna 200

12.1.2. 32-bit

Figure 22: LSB Advanced Short

Figure 23: LSB Advanced Wide

Rev. 16 | Page 36 of 43 | www.onsemi.com

BelaSigna 200

Figure 24: LSB Del Short

Figure 25: LSB Del Wide

Rev. 16 | Page 37 of 43 | www.onsemi.com

BelaSigna 200

Figure 26: MSB Advanced Short

Figure 27: MSB Advanced Wide

Rev. 16 | Page 38 of 43 | www.onsemi.com

BelaSigna 200

Figure 28: MSB Del Short

Figure 29: MSB Del Wide

Table 14: PCM Interface Descriptions

Parameter

Description

Min.

Max.

50

Unit

ns

PCM_CLK high to data valid

Setup time before PCM_CLK high

PCM_CLK high to PCM_FRAME high

PCM_CLK high period (1.28MHz)

PCM_CLK low period (1.28MHz)

T_dv

T_s

T_fr

T_ch

T_cl

10

ns

50

ns

390

ns

Rev. 16 | Page 39 of 43 | www.onsemi.com

BelaSigna 200

12.2 GPIO Timing Diagram

Figure 30: GPIO Timing Diagram

Table 15: GPIO Interface Descriptions

Parameter

Description

Min.

Max.

50

Unit

ns

SYS_CLK high to data valid

Setup time before SYS_CLK high

SYS_CLK high period (1.28MHz)

SYS_CLK low period (1.28MHz)

T_dv

T_s

T_ch

T_cl

10

ns

390

ns

Rev. 16 | Page 40 of 43 | www.onsemi.com

BelaSigna 200

12.3 SPI Port Timing Diagram

Figure 31: SPI Port Timing Diagram

Table 16: SPI Interface Descriptions

Parameter

Description

Min.

Max.

50

Unit

ns

SPI_CLK high to output data valid

Setup time before SPI_CLK high

SPI_CS low to first SPI_CLK high

T_dv

T_s

T_fce

10

ns

Rev. 16 | Page 41 of 43 | www.onsemi.com

BelaSigna 200

13.0 Re-flow Information

The re-flow profile depends on the equipment that is used for the reflow and the assembly that is being reflowed. Use the following

table from the JEDEC Standard 22-A113D Para 3.1.6 for Sn-Pb Eutectic Assembly as a guideline:

Table 17: Re-flow Information

Profile Feature

Sn-Pb Eutectic Assembly

Pb-free Assembly

Average Ramp-Up Rate (TL to TP)

Preheat

3°C/second maximum

Temperature minimum (TSMIN)

Temperature maximum (TSMAX)

Time (min. to max.) (ts)

TSMAX to TL

100°C

150°C

200°C

60-120 seconds

60-180 seconds

Ramp-up rate

3°C/second maximum

Time Maintained Above

Temperature (TL)

183°C

217°C

Time (tL)

60-150 seconds

240 +0/-5°C

60-150 seconds

260 +0/-5°C

Peak Temperature (TP)

Time within 5°C of Actual Peak Temperature

Ramp-Down Rate

10-30 seconds

6°C/second maximum

6 minutes maximum

10-30 seconds

6°C/second maximum

8 minutes maximum

Time 25°C to Peak Temperature

All BelaSigna 200 QFNs with part number revisions 003 (i.e. 0W344-003-XTP) and higher are Pb-free and should follow the re-flow

guidelines for Pb-free assemblies. All BelaSigna 200 CSPs are Pb-free.

14.0 ESD Sensitive Device

CAUTION: Electrostatic discharge (ESD) sensitive device. Permanent damage may occur on devices subjected

to high-energy electrostatic discharges. Proper ESD precautions in handling, packaging and testing are

recommended to avoid performance degradation or loss of functionality.

15.0 Training

To facilitate development on the BelaSigna 200 platform, training is available upon request. Contact your account manager for more

information.

Rev. 16 | Page 42 of 43 | www.onsemi.com

BelaSigna 200

16.0 Ordering Information

Part Number

Package

Shipping Configuration

Temperature Range

-85 to 40 °C

0W344-004-XTP

0W344-005-XTP

0W588-002-XUA

8x8mm QFN

2.3x2.8mm WLCSP

Tape & Reel (500 parts per reel)

Tape & Reel (1000 parts per reel)

Tape & Reel (5000 parts per reel)

-85 to 40 °C

17.0 Company or Product Inquiries

For more information about ON Semiconductor’s products or services visit our Web site at http://onsemi.com.

ON Semiconductor and

are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any

products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising

out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical”

parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating

parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the

rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to

support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or

use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors

harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such

unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action

Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

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Rev. 16 | Page 43 of 43 | www.onsemi.com