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AN 009
Delay Time = 80mS
MOT_DELAY = (0001 0100 or 0x14)
Expected Results
When the registers are loaded with the recommended values and the MOT Enable pin (12) is
pulled high, the KXPS5 becomes armed for HDD protection. This means that the FF/MOT
interrupt will be triggered if the accelerometer experiences an event that exceeds any of the
above described thresholds and delays. In this case, FF/MOT will go high if all accelerometer
axis (X, Y, and Z) simultaneously drop below 0.4g for more than 80mS or if any accelerometer
axis (X, Y, or Z) go rise above 2.5g for more than 80mS. Figures 6 and 7 show how the KXPS5
interrupts will react to a typical event.
© Kionix 2006
9 March 2006
Page 5 of 6
By monitoring the interrupt pin (11), or repeatedly reading the status register, CTRL_REGA
(0x0C), the user will be notified of a harmful event and must park/unload the HDD head for
protection. Note that the interrupts are selected to be unlatched, so they will return low after the
event has concluded. For additional information, please refer to the KXPS5 Data Sheet.
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