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Table 29. Z-Lock Threshold Angles
Z-Lock Value
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
Table 30. Back/Front Orientation Definition
Threshold Angle
14°
18°
21°
25°
29°
33°
37°
42°
BKFR
00
01
10
11
Back/Front Transition
Z < 80° or Z > 280°
Z < 75° or Z > 285°
Z < 70° or Z > 290°
Z < 65° or Z > 295°
Front/Back Transition
Z > 100° and Z < 260°
Z > 105° and Z < 255°
Z > 110° and Z < 250°
Z > 115° and Z < 245°
0x14: P_L_THS_REG Portrait/Landscape Threshold and Hysteresis Register
This register represents the Portrait to Landscape trip threshold register used to set the trip angle for transitioning from Portrait
to Landscape and Landscape to Portrait. This register includes a value for the hysteresis.
0x14: P_L_THS_REG Register (Read/Write)
Bit 7
P_L_THS[4]
Bit 6
P_L_THS[3]
Bit 5
P_L_THS[2]
Bit 4
P_L_THS[1]
Bit 3
P_L_THS[0]
Bit 2
HYS[2]
Bit 1
HYS[1]
Bit 0
HYS[0]
:
Table 31. P_L_THS_REG Description
P_L_THS[7:3]
HYS[2:0]
Portrait/Landscape trip threshold angle from 15° to 75°. See Table 32 for the values with the corresponding approximate
threshold angle. Default value: 1_0000 (45°).
This angle is added to the threshold angle for a smoother transition from Portrait to Landscape and Landscape to Portrait.
This angle ranges from 0° to ±24°. The default is 100 (±14°).
Table 32 is a lookup table to set the threshold. This is the center value that will be set for the trip point from Portrait to
Landscape and Landscape to Portrait. The default Trip Angle is 45° (0x10). The default hysteresis is ±14°.
Note: The condition THS + HYS > 0 and THS + HYS < 32 must be met in order for Landscape/Portrait detection to work properly.
The value of 32 represents the sum of both P_L_THS and HYS register values in decimal. For example, THS angle = 75°,
P_L_THS = 25(dec) then max HYS must be set to 6 to meet the condition THS+HYS < 32. To configure correctly the hysteresis
(HYS) angle must be smaller than the threshold angle (P_L_THS).
Table 32. Threshold Angle Thresholds Lookup Table
Threshold Angle (approx.)
15°
20°
30°
35°
40°
45 °
55°
60°
70°
75°
Table 33. Trip Angles with Hysteresis for 45° Angle
5-bit
Register value
0x07
0x09
0x0C
0x0D
0x0F
0x10
0x13
0x14
0x17
0x19
Hysteresis
Register Value
0
1
2
3
4
Hysteresis
± Angle Range
±0
±4
±7
±11
±14
Landscape to Portrait
Trip Angle
45°
49°
52°
56°
59 °
Portrait to Landscape
Trip Angle
45°
41°
38°
34°
31 °
MMA8451Q
Sensors
Freescale Semiconductor, Inc.
29
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