1、我们是深圳本土最受客户青睐、成长最快、最关注增值服务的 MID 电子元件提供商之一。我们深圳的长期大量现货型号有：MMA7660, MMA7455, MMA8452QR1, MXC6225XU, MMC3140MS, TS1003,MPU-3050, ALC5621, ALC5625, WM8988, ES8388，联系热线：13714686590，杨先生Freescale 公司的 MMA8451Q 是 14 位/8 位智能低功耗三轴数字加速度计,工作电压 1.95V-3.6V,接口电压 1.6V-3.6V,动态可选择满刻度为2g/4g/8g,输出数据速率(ODR)从1.56 Hz 到 800
2、 Hz, 噪音为 99 ug/Hz,14 位和 8 位数字输出,I2C 数字输出接口,主要用在电子罗盘,静态方向检测,笔记电脑,电子阅读器,实时方向检测(如 3D 定位反馈)和实时行为分析(如计步器).本文介绍了 MMA8451Q 主要特性, 方框图, 应用框图以及 MMA845X 传感器加速度计板 LFSTBEB845X 电路图和元件布局图.我们是深圳本土最受客户青睐、成长最快、最关注增值服务的 MID 电子元件提供商之一。我们深圳的长期大量现货型号有：MMA7660, MMA7455, MMA8452QR1, MXC6225XU, MMC3140MS, TS1003,MPU-3050, A
3、LC5621, ALC5625, WM8988, ES8388，联系热线：13714686590，杨先生3-Axis, 14-bit/8-bit Digital AccelerometerThe MMA8451Q is a smart low-power, three-axis, capacitive micromachined accelerometer with 14 bits of resolution. This accelerometer is packed with embedded functions with flexible user programmable options
4、, configurable to two interrupt pins. Embedded interrupt functions allow for overall power savings relieving the host processor from continuously polling data. There is access to both low pass filtered data as well as high pass filtered data, which minimizes the data analysis required for jolt detec
5、tion and faster transitions. The device can be configured to generate inertial wake-up interrupt signals from any combination of the configurable embedded functions allowing the MMA8451Q to monitor events and remain in a low power mode during periods of inactivity. The MMA8451Q is available in a 3 m
6、m x 3 mm x 1 mm QFN package.MMA8451Q 主要特性: 1.95 V to 3.6 V supply voltage 1.6 V to 3.6 V interface voltage 2g/4g/8g dynamically able full-scale Output Data Rates (ODR) from 1.56 Hz to 800 Hz 99 ug/Hz noise 14-bit and 8-bit digital output I2C digital output interface (operates to 2.25 MHz pull-up)wit
7、h 4.7 k ohm 2 programmable interrupt pins for 7 interrupt sources 3 embedded channels of motion detection Freefall or Motion Detection: 1 channel Pulse Detection: 1 channel Jolt Detection: 1 channel Orientation (Portrait/Landscape) detection with programmable hysteresis Automatic ODR change for Auto
8、-WAKE and return to SLEEP 32 sample FIFO High Pass Filter Data available per sample and through the FIFO Self-Test RoHS compliant Current Consumption: 6 uA165uAMMA8451Q 典型应用: E-Compass applications Static orientation detection (Portrait/Landscape, Up/Down, Left/Right, Back/Front position identificat
9、ion) Notebook, E-Reader and Laptop Tumble and Freefall Detection Real-time orientation detection (virtual reality and gaming 3D user position feedback) Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup) Motion detection for portable prod
10、uct power saving (Auto-SLEEP and Auto-WAKE for cell phone, PDA, GPS, gaming) Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging) User interface (menu scrolling by orientation change, tap detection for button replacement)图 1.MMA8451Q 方框图图 2.MMA8451Q 应用框图LFST
11、BEB845X: MMA845X 传感器加速度计板The LFSTBEB845X is an evaluation board for the Freescale MMA845X family of 3-axis high performance, high functionality low-g accelerometers. The LFSTBEB845X kit includes daughter boards for each of the three devices in this family: MMA8451Q, MMA8452Q, and MMA8453Q. For custo
12、mers already familiar with the Sensor Toolbox Platform, the LFSTBEB845X is designed to work with the LFSTBBAT9 for power or LFSTBUSB for communication to a PC.The development kit RDMMA845X comes with both the LFSTBEB845X and the LFSTBUSB boards together for evaluating all of the embedded MMA845X fun
13、ctionality.LFSTBEB845X 包括: One Accelerometer Development Board One MMA8451 Daughter Board One MMA8452 Daughter Board One MMA8453 Daughter Board USB Cable Quick Start Guide 图 3.LFSTBEB845X 传感器加速度计板外形图图 4.LFSTBEB845X 电路图图 5.LFSTBEB845X MCU 电路图图 6.LFSTBEB845X 板元件布局图图 7. MMA8451Q 电路图图 8. MMA8452Q 电路图我们是深圳本土最受客户青睐、成长最快、最关注增值服务的 MID 电子元件提供商之一。我们深圳的长期大量现货型号有：MMA7660, MMA7455, MMA8452QR1, MXC6225XU, MMC3140MS, TS1003,MPU-3050, ALC5621, ALC5625, WM8988, ES8388，联系热线：13714686590，杨先生
