AD5933 是ADI公司出品的 1 MSPS、12位阻抗转换器和网络分析仪，可用于电化学分析、生物电阻抗分析、阻抗频谱分析，复阻抗测量、生物医学和汽车传感器、材料性质分析等，使用IIC通信方式。
本想做一个完整的基于Arduino的AD5933阻抗测量系统，目前由于时间关系，先探索下其IIC通信方式，尝试实现控制AD5933进行温度采集并通过串口发送
软件代码主要包括以下个部分
1 发送温度采集命令
2 读取状态寄存器并判断温度采集是否完成
3 读取温度高位字节
4 读取温度低位字节
5 温度格式转换
6 串口发送温度数据
由于我的Arduino开发环境没有配置，不支持中文注释，所以采用了英文注释
代码如下，编译通过
#include <Wire.h> // IIC control AD5933
char temphigh = 0;
char templow = 0;
char statusnow = 0;
float temperature = 0;
void setup()
{
// initialize the serial communication:
Serial.begin(9600);
Wire.begin(); // join i2c bus (address optional for master)
}
void loop()
{
delay(500);
// 1. begin measure temperature
Wire.beginTransmission(13); // transmit to device #13 (0x0D)
Wire.write(byte(0x80)); // sends instruction byte
Wire.write(byte(0x90)); // Measure temperature
Wire.endTransmission(); // stop transmitting
// 2. read status
do
{
Wire.beginTransmission(13); // transmit to device #13 (0x0D) // 0x0D
Wire.write(byte(0xB0)); // sends instruction byte -> read
Wire.write(byte(0x8F)); // status register address
Wire.endTransmission(); // stop transmitting
Wire.requestFrom(13, 1, true); // request 1 bytes from slave device #13
while(Wire.available()) // slave may send less than requested
statusnow = Wire.read(); // receive a byte as character
}
while((statusnow | byte(0xFE)) != byte(0xFF));
// 3. read temperature high address
Wire.beginTransmission(13); // transmit to device #13 (0x0D) // 0x0D
Wire.write(byte(0xB0)); // sends instruction byte -> read
Wire.write(byte(0x92)); // temperature register high address
Wire.endTransmission(); // stop transmitting
Wire.requestFrom(13, 1, true); // request 1 bytes from slave device #13
while(Wire.available()) // slave may send less than requested
{
temphigh = Wire.read(); // receive a byte as character
}
// 4. read temperature low address
Wire.beginTransmission(13); // transmit to device #13 (0x0D) // 0x0D
Wire.write(byte(0xB0)); // sends instruction byte -> read
Wire.write(byte(0x93)); // temperature register low address 1
Wire.endTransmission(); // stop transmitting
Wire.requestFrom(13, 1, true); // request 1 bytes from slave device #13
while(Wire.available()) // slave may send less than requested
{
templow = Wire.read(); // receive a byte as character
}
// 5. trans temperature;
temperature = (temphigh<< 8) | templow;
if(temphigh & 0x20 == 0x20)
temperature = temperature - 16384;
temperature = temperature /32 ;
// 6. send temperature by uart
Serial.print("The Temperature is: ");
Serial.println(temperature,2);
delay(500);
}
