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PART NUMBER:
± 2.5g Tri-axis Analog
Accelerometer Specifications
KXTH9-2083
Rev. 3
Sep-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:
C 2 ? C 3 ? C 4 ?
4 . 97 x 10 ? 6
f BW
USING THE MULTIPLEXED OUTPUT OF THE KXTH9
Multiplexer Data Select
The KXTH9 features an integrated 4-channel multiplexer. This feature reduces system MCU
requirements to only 1 ADC and 2 digital I/O’s. The KXTH9 uses two select inputs (S0, S1) to contro l
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 KXTH9 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 KXTH9 will be operating with a typical bandwidth of ~50Hz and a maximum of
1000Hz.
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