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
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Table 25. 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0: Decrements debounce whenever condition of interest is no longer valid.
1: Clears counter whenever condition of interest is no longer valid.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 27 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 26. PL_COUNT Description
DBCNE[7:0]
Debounce Count value. Default value: 0000_0000.
Table 27. 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 bits allow the user to adjust the Z-lockout region from 14° up to 43°. The default Z-lockout angle
is set to the default value of 29° upon power up. The Back to Front trip angle is set by default to ±75° but this angle also can be
adjusted from a range of 65° to 80° with 5° step increments.
0x13: PL_BF_ZCOMP Register (Read/Write)
Bit 7
BKFR[1]
Bit 6
BKFR[0]
Bit 5
Bit 4
Bit 3
Bit 2
ZLOCK[2]
Bit 1
ZLOCK[1]
Bit 0
ZLOCK[0]
Table 28. PL_BF_ZCOMP Description
BKFR[7:6]
ZLOCK[2:0]
Back/Front Trip Angle Threshold. Default: 01 ≥ ±75° . Step size is 5°.
Range: ±(65° to 80°).
Z-Lock Angle Threshold. Range is from 14° to 43°. Step size is 4°.
Default value: 100 ≥ 29° . Maximum value: 111 ≥ 43° .
Note: All angles are accurate to ±2°.
MMA8451Q
Sensors
28
Freescale Semiconductor, Inc.
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