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5.1.3 I 2 C options
In the as-shipped configuration, the KXTF9 accelerometer is connected to the
auxiliary I 2 C bus that is controlled by the IMU-3000 gyroscope. The IMU-3000 will
pass data from the primary I 2 C bus directly through to the KXTF9. This allows the
Digital Motion Processor in the IMU-3000 to directly control the KXTF9. See the IMU-
3000 datasheet for further details on this feature. If it is desired to connect the KXTF9
directly to the MCU I 2 C data bus, remove the two zero-ohm resistors, R8 and R9, and
insert them into positions R5 and R6. This will then bypass the IMU-3000 and allow
direct control of the KXTF9.
5.1.4 Regulator power control
In normal operation, the Regulator Enable input on the voltage regulator is pulled up
by resistor R10. This pull-up is controlled by pin 8 on the J2 digital header, which is
normally in high-impedance mode. If it is desired to power cycle the sensor board,
switch pin 8 to ground. This will disable the regulator and turn off all the sensors.
6
AVR4018
8369A-AVR-01/11
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