MMA8652FC datasheet(41/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.8.4

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).

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]

Figure 33. 0x13: PL_BF_ZCOMP register (Read/Write)

Table 29. PL_BF_ZCOMP register

Bit(s)

Field

Description

Notes

7–6

BKFR[7:6]

Back/Front trip angle threshold

• Step size = 5°

• Range = ±(65° to 80°)

≥ ±75° (default)

All angles are accurate to ±2°.

2–0

ZLOCK[2:0]

Z-lock sngle threshold

• Step size is 4°

• Range is from 14° to 43°

100

≥ 29° (default)

111

≥ 43° (maximum)

Table 30. 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 31. Back/Front orientation definitions

BKFR

Back/Front Transition

Front/Back Transition

Z < 80° or Z > 280°

Z > 100° and Z < 260°

Z < 75° or Z > 285°

Z > 105° and Z < 255°

Z < 70° or Z > 290°

Z > 110° and Z < 250°

Z < 65° or Z > 295°

Z > 115° and Z < 245°

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