PART NUMBER:
± 2.75g Tri-axis Analog
Accelerometer Specifications
KXTH5-4325
Rev. 2
Feb-2011
Application Design Equations
The bandwidth is determined by a factory programmable switched capacitor filter. The filter can be set at the
factory to be 2kHz, 1kHz, 500Hz, 100Hz, 50Hz, or no low pass filter. Alternatively, bandwidth can be reduced
by addition of a capacitor on the output pins 5, 6, and 7 according to the equation:
4.97x10−6
C2 = C3 = C4 =
fBW
USING THE MULTIPLEXED OUTPUT OF THE KXTH5
Multiplexer Data Select
The KXTH5 features an integrated 4-channel multiplexer. This feature reduces system MCU
requirements to only 1 ADC and 2 digital I/O’s. The KXTH5 uses two select inputs (S0, S1) to control
the data flow from Vmux. When a microprocessor toggles the select inputs, the desired output is
attained based on the select table. Note that logic 0 is GND and logic 1 is Vdd.
S1
0
0
1
1
S0
0
1
0
1
Vmux
X Output
Y Output
Z Output
Aux In
Output Select Table
Data Sampling Rate
When operating in its multiplexed mode, the KXTH5 has the ability to achieve very high data sampling
rates. Internally, the sensor elements (X, Y, and Z) are sequentially sampled in a “round robin” fashion
at a rate of 32 kHz per axis. Combine this high sensor element sampling rate with the short 5 µs
settling time of the integrated multiplexer, and the user can achieve a performance very close to that of
the 3 separate analog outputs. This is more than sufficient to eliminate any aliasing in the final
application since the KXTH5 will be operating with a typical bandwidth of ~50Hz and a maximum of
1000Hz.
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