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3.8.10.4 Arming Pulse Stretch Function
A pulse stretch function can be applied to the arming output in moving average mode, or count mode.
If the pulse stretch function is not used (APS[1:0] = ‘00’), the arming output is asserted if and only if an arming condition exists
for the associated axis after the most recent evaluated sample. The arming output is de-asserted if and only if an arming condition
does not exist for the associated axis after the most recent evaluated sample.
If the pulse stretch function is used, (APS[1:0] not equal ‘00’), the arming output is controlled only by the value of the pulse
stretch timer value. If the pulse stretch timer value is non-zero, the arming output is asserted. If the pulse stretch timer is zero,
the arming output is de-asserted. The pulse stretch counter continuously decrements until it reaches zero. The pulse stretch
counter is reset to the programmed pulse stretch value if and only if an arming condition exists for the associated axis after the
most recent evaluated sample. Reference Figure 28 .
The desired pulse stretch time is programmable for via the APS[1:0] bits in the ARMCFG register.
Exception conditions listed in Section 4.5 do not impact prior arming function responses. If an exception occurs after an arming
activation, the corresponding pulse stretch for the existing arming condition will continue. However, new acceleration reads will
not reset the pulse stretch counter regardless of the acceleration value.
3.8.10.5 Arming Pin Output Structure
The arming output pin structure can be set to active high, or active low with the A_CFG bits in the DEVCFG register as de-
scribed in Section 3.1.6.6 . The active high and active low pin output structures are shown in Figure 31 .
Open Drain, Active High
V CC
Open Drain, Active Low
V CC
Arm Function
Gating
ARM
Arm Function
Gating
ARM
Figure 31. Arming Function - Pin Output Structure
MMA655x
Sensor
Freescale Semiconductor, Inc.
39
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