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6.6
Auto-WAKE/SLEEP Detection
The ASLP_COUNT register sets the minimum time period of inactivity required to change current ODR value from the value
specified in the DR[2:0] register to ASLP_RATE register value, provided the SLPE bit is set to a logic ‘1’ in the CTRL_REG2
register. See Table 52 for functional blocks that may be monitored for inactivity in order to trigger the “return to SLEEP” event.
0x29: ASLP_COUNT Register (Read/Write)
Bit 7
D7
Bit 6
D6
Bit 5
D5
Bit 4
D4
Bit 3
D3
Bit 2
D2
Bit 1
D1
Bit 0
D0
Table 50. ASLP_COUNT Description
D[7:0]
Duration value. Default value: 0000_0000.
D7-D0 defines the minimum duration time to change current ODR value from DR to ASLP_RATE . Time step and maximum
value depend on the ODR chosen as shown in Table 51 .
Table 51. ASLP_COUNT Relationship with ODR
Output Data Rate
(ODR)
800 Hz
400 Hz
200 Hz
100 Hz
50 Hz
12.5 Hz
6.25 Hz
1.56 Hz
Duration
0 to 81s
0 to 81s
0 to 81s
0 to 81s
0 to 81s
0 to 81s
0 to 81s
0 to 162s
ODR Time Step
1.25 ms
2.5 ms
5 ms
10 ms
20 ms
80 ms
160 ms
640 ms
ASLP_COUNT Step
320 ms
320 ms
320 ms
320 ms
320 ms
320 ms
320 ms
640 ms
Table 52. SLEEP/WAKE Mode Gates and Triggers
Interrupt Source
SRC_TRANS
SRC_LNDPRT
SRC_PULSE
SRC_FF_MT
SRC_ASLP
SRC_DRDY
Event restarts timer and
delays Return to SLEEP
Yes
Yes
Yes
Yes
No*
No
Event will WAKE from SLEEP
Yes
Yes
Yes
Yes
No*
No
In order to wake the device, the desired function or functions must be enabled in CTRL_REG4 and set to WAKE to SLEEP in
CTRL_REG3. All enabled functions will still function in SLEEP mode at the SLEEP ODR. Only the functions that have been
selected for WAKE from SLEEP will WAKE the device.
MMA8452Q has four functions that can be used to keep the sensor from falling asleep; Transient, Orientation, Pulse, and
Motion/FF. One or more of these functions can be enabled. In order to WAKE the device, four functions are provided; Transient,
Orientation, Pulse, and the Motion/Freefall. The Auto-WAKE/SLEEP interrupt does not affect the WAKE/SLEEP, nor does the data
ready interrupt. See Register 0x2C for the WAKE from SLEEP bits.
If the Auto-SLEEP bit is disabled, then the device can only toggle between STANDBY and WAKE mode. If Auto-SLEEP
interrupt is enabled, transitioning from ACTIVE mode to Auto-SLEEP mode and vice versa generates an interrupt.
MMA8452Q
Sensors
36
Freescale Semiconductor, Inc.
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