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PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
Motion Interrupt Feature Description
The Motion interrupt feature of the KXTF9 reports qualified high-pass filtered acceleration based on the Wake
Up (WUF) threshold. If the high-pass filtered acceleration on any axis is greater than the user-defined wake
up threshold (WUF_THRESH), the device has transitioned from an inactive state to an active state. When
configured in the unlatched mode, the KXTF9 will report when the motion event finished and the device has
returned to an inactive state. Equation 4 shows how to calculate the WUF_THRESH register value for a
desired wake up threshold.
WUF_THRESH (counts) = Wake Up Threshold (g) x 16 (counts/g)
Equation 4. Wake Up Threshold
A WUF (WUF_TIMER) 8-bit raw unsigned value represents a counter that permits the user to qualify each
active/inactive state change. Note that each WUF Timer count qualifies 1 (one) user-defined ODR period
(OWUF). Equation 5 shows how to calculate the WUF_TIMER register value for a desired wake up delay
time.
WUF_TIMER (counts) = Wake Up Delay Time (sec) x OWUF (Hz)
Equation 5. Wake Up Delay Time
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