MMA8652FC datasheet(36/65 Pages) NXP

36 / 65 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

Table 47, “Threshold angle thresholds look-up table,” on page 36 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°.

7–3

P_L_THS[7:3]

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

See Table 47, “Threshold angle thresholds look-up table,” on

page 36 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 47. 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 48. 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°

Table 46. P_L_THS_REG register (Continued)

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