MMA8652FC datasheet(42/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.8.5

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 33 is a look-up table to set the threshold. This is the center value that will be set for the trip point from portrait to landscape

and from landscape to portrait. The default trip angle is 45° (0x10). The default hysteresis is ±14°.

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]

Figure 34. 0x14: P_L_THS_REG register (Read/Write)

Table 32. P_L_THS_REG register

Bit(s)

Field

Description

Notes

7–3

P_L_THS[7:3]

Portrait/Landscape trip threshold angle (from 15° to 75°)

See Table 33 for the values with the corresponding approximate

threshold angle.

1_0000

(45°) (default)

For the landscape/portrait detection to work

correctly,

THS + HYS > 0

and THS + HYS < 32.

All angles are accurate to ±2°.

2–0

HYS[2:0]

Hysteresis value

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°.

100 (±14°) (default)

Table 33. Threshold angle thresholds look-up table

Threshold Angle

(approximately)

5-bit Register

Value

15°

0x07

20°

0x09

30°

0x0C

35°

0x0D

40°

0x0F

45°

0x10

55°

0x13

60°

0x14

70°

0x17

75°

0x19

Table 34. Trip angles with hysteresis for 45° angle

Hysteresis

± Angle Range

Landscape-to-Portrait

Trip Angle

Portrait-to-Landscape

Trip Angle

±0

45°

±4

49°

41°

±7

52°

38°

±11

56°

34°

±14

59°

31°

±17

62°

28°

±21

66°

24°

±24

69°

21°

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