Datasheet

MMA8652FC
Sensors
Freescale Semiconductor, Inc. 35
6.7.4 0x13: PL_BF_ZCOMP Back/Front and Z Compensation register
The Z-Lock angle compensation bits allows you to adjust the Z-lockout region from 14° up to 43°. On power-up, the default Z-lockout
angle is set to the default value of 29°. The back-to-front trip angle is set by default to ±75°, and this angle can be adjusted from
a range of 65° to 80° (with 5° step increments).
6.7.5 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 mode and from Landscape to Portrait mode. This register includes a value for the hysteresis.
Table 41. 0x13: PL_BF_ZCOMP register (Read/Write)
Back to Register Address Map
Bit
7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
BKFR[1] BKFR[0] — — — ZLOCK[2] ZLOCK[1] ZLOCK[0]
Table 42. PL_BF_ZCOMP register
Bit(s) Field Description Notes
7–6 BKFR[7:6]
Back/Front trip angle threshold
(1)
• Step size = 5°
• Range = ±(65° to 80°)
1. All angles are accurate to ±2°.
01
≥ ±75° (default)
5–3 — Can be 0 or 1.
2–0 ZLOCK[2:0]
Z-lock angle threshold
(1)
• Step size is 4°
• Range is from 14° to 43°
100
≥ 29° (default)
111
≥ 43° (maximum)
Table 43. Z-lock threshold angles
Z-lock Value Threshold Angle
0x00 14°
0x01 18°
0x02 21°
0x03 25°
0x04 29°
0x05 33°
0x06 37°
0x07 42°
Table 44. Back/Front orientation definitions
BKFR Back/Front Transition Front/Back Transition
00 Z < 80° or Z
> 280° Z > 100° and Z < 260°
01 Z < 75° or Z
> 285° Z > 105° and Z < 255°
10 Z < 70° or Z
> 290° Z > 110° and Z < 250°
11 Z < 65° or Z
> 295° Z > 115° and Z < 245°
Table 45. 0x14: P_L_THS_REG register (Read/Write) Back to Register Address Map
Bit
7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
P_L_THS[4] P_L_THS[3] P_L_THS[2] P_L_THS[1] P_L_THS[0] HYS[2] HYS[1] HYS[0]
Table 46. P_L_THS_REG register
Bit(s) Field Description Notes