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5.9
Orientation Detection
The MMA8451Q incorporates an advanced algorithm for orientation detection (ability to detect all 6 orientations) with
configurable trip points. The embedded algorithm allows the selection of the mid point with the desired hysteresis value.
The MMA8451Q Orientation Detection algorithm confirms the reliability of the function with a configurable Z-lockout angle.
Based on known functionality of linear accelerometers, it is not possible to rotate the device about the Z-axis to detect change in
acceleration at slow angular speeds. The angle at which the device no longer detects the orientation change is referred to as the
“Z-Lockout angle”. The device operates down to 14° from the flat position.
For further information on the configuration settings of the orientation detection function, including recommendations for
configuring the device to support various application use cases, refer to Freescale application note, AN4068 .
Figure 8 shows the definitions of the trip angles going from Landscape to Portrait (A) and then also from Portrait to Landscape
(B).
Top View
PU
Pin 1
Earth Gravity
Side View
BACK
LL
Xout @ -1g
Xout @ 0g
Yout @ -1g
Zout @ 0g
PD
LR
Xout @ 1g
Xout @ 0g
Yout @ 0g
Zout @ -1g
FRONT
Yout @ 0g
Zout @ 0g
Yout @ 0g
Zout @ 0g
Xout @ 0g
Yout @ 0g
Zout @ 1g
Xout @ 0g
Yout @ 1g
Zout @ 0g
Figure 7. Landscape/Portrait Orientation
PORTRAIT
90°
Landscape to Portrait
Trip Angle = 60°
PORTRAIT
90°
Portrait to Landscape
Trip Angle = 30°
(A)
0° Landscape
(B)
0° Landscape
Figure 8. Illustration of Landscape to Portrait Transition (A) and Portrait to Landscape Transition (B)
MMA8451Q
Sensors
Freescale Semiconductor, Inc.
15
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相关代理商/技术参数
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MMA8452QR1 功能描述:加速计 - 板上安装 LOW G 3-AXIS 12BT EX VLT RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8452QT 功能描述:加速计 - 板上安装 LOW G 3-AXIS 12BT EX VLT RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
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MMA8453QR1 功能描述:加速计 - 板上安装 LOW G 3-AXIS DGTL ACCEL RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8453QT 功能描述:加速计 - 板上安装 LOW G 3-AXIS DGTL ACCEL RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8491Q 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA8491Q 3-Axis Multifunction Digital Accelerometer
MMA8491QR1 功能描述:加速计 - 板上安装 3-Axis Low Voltage Discrete Tilt Sensor RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C