± 2g Tri-axis Accelerometer
Specifications
PART NUMBER:
KXRB5-2050
Rev. 2
May-2014
36 Thornwood Dr. – Ithaca, NY 14850 © 2014 Kionix – All Rights Reserved
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USING THE MULTIPLEXED OUTPUT OF THE KXRB5
Multiplexer Data Select
The KXRB5 features an integrated 4-channel multiplexer. This feature reduces system MCU
requirements to only 1 ADC and 2 digital I/O’s. The KXRB5 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.
Output Select Table
Data Sampling Rate
When operating in its multiplexed mode, the KXRB5 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. Note that this is a differential capacitance sampling of each sensor
element, which stores an analog voltage on the filter cap for each 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 KXRB5 will be operating with a typical
bandwidth of ~50Hz and a maximum of 1000Hz.
