MY9221
12-Channel LED Driver With Grayscale
Adaptive Pulse Density Modulation Control
MY-Semi
General Description
Features
✦ 3.3 ~ 5V Operating supply voltage (±10%
)
The MY9221, 12-channels (R/G/B x 4) constant
current APDM (Adaptive Pulse Density
Modulation) LED driver, operates over a 3.3V ~ 5V
input voltage range (±10%). The device provides 12
open-drain constant current sinking outputs that are
rated to 2 4 V and delivers up to 60mA of high accuracy
current to each string of LED. The current at each output
is programmable by means of three external current
setting resistors. MY9221 features a 10MHz EMI
reduction data clock input. MY9221 also offers a
2-wire serial interface to send the grayscale data, control
command including 16/14/12/8-bit grayscale selection,
grayscale clock frequency division selection, output
polarity selection for high power LED driving, output Tr/Tf
timing selection, current output waveform selection, and
to realize the internal-latch function. MY9221 provides
adaptive pulse density modulation method to increase the visual
refresh rate up to 1000 Hz @ 16-bit grayscale and reduce the
flickers, and it also provides output current bilateral
processing for EMI reduction. Moreover MY9221 utilizes
clock duty recovery technique and pulse re-timing to help
✦ R/G/B x4 Output Channels
✦ 3~60mA@5V Constant current output range
✦ 3~35mA@3.3V Constant current output range
✦ Current setting by 3 external resistors
✦ 24V Rated output channels for long LED strings
✦ ±1%(typ.) LED Current accuracy between channels
✦ ±2%(typ.) LED Current accuracy between chips
✦ 20Mbps(max.) ~ 140 Kbps(min.) data rate for EMI
[ patent pending ]
[ patent pending ]
reduction data transfer [ patent pending ]
✦ 16 / 14 / 12 / 8 bit grayscale selection
✦ Built-in internal grayscale clock supports refresh rate
>1000Hz@16-bit grayscale, >256KHz@8-bit grayscale
✦ Internal Grayscale clock frequency selection for High
Power LED driving application (min. 33.6KHz)
✦ Grayscale clock source selection (SSOP & TSSOP
only): internal or external
[ patent pending ]
[ patent pending ]
✦ PWM or APDM control selection [ patent pending ]
✦ Clock duty recovery for cascading application
✦ Schmitt trigger input
long distance and multiple cascading applications
.
MY9221 provides typical ±1% channel-to-channel
LED current accuracy. Additional features include a
±0.1% regulated output current capability and fast output
transient response. MY9221 is available in a 20-pin QFN
or 24-pin SSOP/TSSOP package and specified over the
-40°C to +85°C ambient temperature range.
✦ Output Current Tr / Tf programmable
✦ Output Current Bilateral Processing for EMI reduction
✦ -40°C to +85°C Ambient temperature range
Applications
Order information
Part
Package Information
SOP24-236mil-1.0mm
SSOP24-150mil-0.635mm
❑ Indoor and Outdoor LED Video Displays
❑ Full Color Mesh Display
MY9221SA
MY9221SS
2000 pcs/Reel
2500 pcs/Reel
3000 pcs/Reel
❑ Full Color Dot Matrix Module
❑ Architectural and Decorative Lighting
MY9221QD QFN20-4mmx4mm-0.5mm
❑
LCD Display Backlighting
TSSOP24-173mil-0.65mm
MY9221TE
2500 pcs/Reel
(Exposed Pad)
Typical Operating Circuits
Pin Configuration
SA / SS / TE
QD
Jul. 2013 Ver. 3.0
MY-Semi Inc.
0
For pricing, delivery, and ordering information, please contact MY-Semi Inc. at +886-3-560-1668,
or email to INFO@MY-Semi.com.tw or visit MY-Semi’s website at www.MY-Semi.com or www.MY-Semi.com.tw
