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5
Functionality
The MMA8451Q is a low-power, digital output 3-axis linear accelerometer with a I 2 C interface and embedded logic used to
detect events and notify an external microprocessor over interrupt lines. The functionality includes the following:
? 8-bit or 14-bit data, High-Pass Filtered data, 8-bit or 14-bit configurable 32 sample FIFO
? Four different oversampling options for compromising between resolution and current consumption based on application
requirements
? Additional Low Noise mode that functions independently of the Oversampling modes for higher resolution
? Low Power and Auto-WAKE/SLEEP modes for conservation of current consumption
? Single/Double tap with directional information 1 channel
? Motion detection with directional information or Freefall 1 channel
? Transient/Jolt detection based on a high-pass filter and settable threshold for detecting the change in acceleration above
a threshold with directional information 1 channel
? Flexible user configurable portrait landscape detection algorithm addressing many use cases for screen orientation
All functionality is available in 2g, 4g or 8g dynamic ranges. There are many configuration settings for enabling all the different
functions. Separate application notes have been provided to help configure the device for each embedded functionality.
Table 8. Features of the MMA845xQ devices
Feature List
Digital Resolution (Bits)
Digital Sensitivity (Counts/g)
Data-Ready Interrupt
Single-Pulse Interrupt
Double-Pulse Interrupt
Directional-Pulse Interrupt
Auto-WAKE
Auto-SLEEP
Freefall Interrupt
32 Level FIFO
High-Pass Filter
Low-Pass Filter
Orientation Detection Portrait/Landscape = 30°, Landscape to Portrait = 60°,
and Fixed 45° Threshold
Programmable Orientation Detection
Motion Interrupt with Direction
Transient Detection with High-Pass Filter
Low Power Mode
5.1
Device Calibration
MMA8451
14
4096
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
MMA8452
12
1024
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
MMA8453
10
256
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
The device interface is factory calibrated for sensitivity and Zero-g offset for each axis. The trim values are stored in Non
Volatile Memory (NVM). On power-up, the trim parameters are read from NVM and applied to the circuitry. In normal use, further
calibration in the end application is not necessary. However, the MMA8451Q allows the user to adjust the Zero-g offset for each
axis after power-up, changing the default offset values. The user offset adjustments are stored in 6 volatile registers. For more
information on device calibration, refer to Freescale application note, AN4069 .
MMA8451Q
Sensors
12
Freescale Semiconductor, Inc.
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相关代理商/技术参数
MMA8452Q 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:3-Axis, 12-bit/8-bit Digital Accelerometer
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
MMA8453Q 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA8453Q 3-Axis, 10-bit/8-bit Digital Accelerometer
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