FXLS8471Q datasheet(49/75 Pages) FREESCALE

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FXLS8471Q

Sensors

Freescale Semiconductor, Inc.

10.7.5

PL_THS_REG (0x14) register

Portrait to landscape trip threshold registers.

10.8

Freefall and Motion detection

The Freefall/Motion detection block can be configured to detect low-g (freefall) or high-g (motion) events utilizing the

A_FFMT_CFG[a_ffmt_oae] bit.

In low-g detect mode (A_FFMT_CFG[a_ffmt_oae] = 0) a low-g condition will need to occur on all enabled axes (ex. X, Y and Z)

for the A_FFMT_SRC[a_ffmt_ea] bit to be affected. And, in high-g detect mode (A_FFMT_CFG[a_ffmt_oae] = 1) a high-g

condition occurring in any of the enabled axes (ex. X, Y or Z) will suffice to affect the A_FFMT_SRC[a_ffmt_ea] bit.

The detection threshold(s) are programed in register 0x17 (A_FFMT_THS) for common threshold operation, and 0x73-0x78

(A_FFMT_THS_X/Y/Z) for individual axis threshold operation.

A_FFMT_CFG[a_ffmt_ele] bit determines the behavior of A_FFMT_SRC[a_ffmt_ea] bit in response to the desired acceleration

event (low-g/high-g). When A_FFMT_CFG[a_ffmt_ele] = 1, the freefall or motion event is latched and the

Table 70. PL_THS_REG register

pl_ths[4:0]

hys[2:0]

5’b01000

3’b100

Table 71. Threshold angle lookup table

pl_ths[4:0] value

Threshold angle (approx.)

0x07

15°

0x09

20°

0x0C

30°

0x0D

35°

0x0F

40°

0x10

45°

0x13

55°

0x14

60°

0x17

70°

0x19

75°

Table 72. Trip angles versus hysteresis settings

hys[2:0] value

Landscape to Portrait trip angle

Portrait to Landscape trip angle

45°

49°

41°

52°

38°

56°

34°

59°

31°

62°

28°

66°

24°

69°

21°

Table 73. Portrait/Landscape ideal orientation definitions

Position

Description

y ~ -1 g, x ~ 0

y ~ +1 g, x ~ 0

y ~ 0, x ~ +1 g

y ~ 0, x ~ -1 g

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