ADI ADXL345血压计解决方案

ADI公司的血压计解决方案采用3轴±2 g/±4 g/±8 g/±16 g 数字加速度计ADXL345,
12位电容-数字转换器AD7152/AD7153, 全速/低速USB数字绝缘器ADuM4160,单电极容性传感器CapTouch可编程控制器AD7147,以及带低部端口和数字输出的iMEMS麦克风ADMP421等器件.本文介绍了血压计解决方案方框图,以及所采用的主要元器件的主要特性,方框图和应用电路等.


图1.电子血压计方框图

主要元器件介绍:

ADXL345: 3-Axis, ±2 g/±4 g/±8 g/±16 g Digital Accelerometer

The ADXL345 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is acces-sible through either a SPI (3- or 4-wire) or I2C digital interface.

The ADXL345 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing appli-cations, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes less than 1.0°.
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