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0x11 Portrait/Landscape Configuration Register
This register enables the Portrait/Landscape function and sets the behavior of the debounce counter.
0x11 PL_CFG Register (Read/Write)
Bit 7
DBCNTM
Bit 6
PL_EN
Bit 5
0
Bit 4
0
Bit 3
0
Bit 2
0
Bit 1
0
Bit 0
0
Table 21. PL_CFG Description
Debounce counter mode selection. Default value: 1
DBCNTM
PL_EN
0: Decrements debounce whenever condition of interest is no longer valid.
1: Clears counter whenever condition of interest is no longer valid.
Portrait/Landscape Detection Enable. Default value: 0
0: Portrait/Landscape Detection is Disabled.
1: Portrait/Landscape Detection is Enabled.
0x12 Portrait/Landscape Debounce Counter
This register sets the debounce count for the orientation state transition. The minimum debounce latency is determined by the
data rate set by the product of the selected system ODR and PL_COUNT registers. Any transition from WAKE to SLEEP or vice
versa resets the internal Landscape/Portrait debounce counter. Note: The debounce counter weighting (time step) changes
based on the ODR and the Oversampling mode. Table 23 explains the time step value for all sample rates and all Oversampling
modes.
0x12 PL_COUNT Register (Read/Write)
Bit 7
DBNCE[7]
Bit 6
DBNCE[6]
Bit 5
DBNCE[5]
Bit 4
DBNCE[4]
Bit 3
DBNCE[3]
Bit 2
DBNCE[2]
Bit 1
DBNCE[1]
Bit 0
DBNCE[0]
Table 22. PL_COUNT Description
DBCNE[7:0]
Debounce Count value. Default value: 0000_0000.
Table 23. PL_COUNT Relationship with the ODR
ODR (Hz)
Normal
Max Time Range (s)
LPLN HighRes
LP
Normal
Time Step (ms)
LPLN HighRes
LP
800
400
200
100
50
12.5
6.25
1.56
0.319
0.638
1.28
2.55
5.1
5.1
5.1
5.1
0.319
0.638
1.28
2.55
5.1
20.4
20.4
20.4
0.319
0.638
0.638
0.638
0.638
0.638
0.638
0.638
0.319
0.638
1.28
2.55
5.1
20.4
40.8
40.8
1.25
2.5
5
10
20
20
20
20
1.25
2.5
5
10
20
80
80
80
1.25
2.5
2.5
2.5
2.5
2.5
2.5
2.5
1.25
2.5
5
10
20
80
160
160
0x13: PL_BF_ZCOMP Back/Front and Z Compensation Register
The Z-Lock angle compensation is set to 29°. The Back to Front trip angle is set to ±75°.
0x13: PL_BF_ZCOMP Register (Read Only)
Bit 7
BKFR[1]
Bit 6
BKFR[0]
Bit 5
0
Bit 4
0
Bit 3
0
Bit 2
ZLOCK[2]
Bit 1
ZLOCK[1]
Bit 0
ZLOCK[0]
Table 24. PL_BF_ZCOMP Description
BKFR[7:6]
ZLOCK[2:0]
Back Front Trip Angle Fixed Threshold = 01 which is ≥ ±75°.
Z-Lock Angle Fixed Threshold = 100 which is 29°.
Note: All angles are accurate to ±2°.
MMA8453Q
Sensors
24
Freescale Semiconductor, Inc.
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