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MMA8652FC 데이터시트(PDF) 42 Page - Freescale Semiconductor, Inc

부품명 MMA8652FC
상세설명  Xtrinsic MMA8652FC 3-Axis, 12-bit Digital Accelerometer
PDF  77 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
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MMA8652FC 데이터시트(HTML) 42 Page - Freescale Semiconductor, Inc

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MMA8652FC
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42
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
Register Value
Hysteresis
± Angle Range
Landscape-to-Portrait
Trip Angle
Portrait-to-Landscape
Trip Angle
0
±0
45°
45°
1
±4
49°
41°
2
±7
52°
38°
3
±11
56°
34°
4
±14
59°
31°
5
±17
62°
28°
6
±21
66°
24°
7
±24
69°
21°



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