[参考译文] TMP61：我们能否使用10位 ADC (MSP430FR2433 MCU)实现1C 级精度？

Jevant、

我能够通过使用1.5V 偏置而不是3.3V 来解决这个问题。  这是因为 MSP430FR2433只有1.5V 的内部基准电压。  我已附加一些 Energia 代码、用于配置器件并通过终端上的 UART 发送数据。  请参阅以下在~8C 下测得的测试结果。  红线是用于参考的 TMP117、蓝线是滤波和偏移后的 TMP61。  请告诉我、您是否也能够利用此功能来解决您的问题。

这是代码。

/*
  AnalogReadSerial TMP6
  Reads an analog input on pin 6, prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A3, and the outside pins to ~3V and ground.

  Hardware Required:
    MSP-EXP430F5529 LaunchPad
    TMP6 with bias resistor
    hook-up wire

  This example code is in the public domain.


*/
#include <Wire.h>
int sensorPin = A6;    // select the input pin for the potentiometer
int sensorValue = 0;
float VTEMP = 0;
float AMB_TEMP = 0;
float Meas_Temp = 0;        //
float Alpha = 0.01;       // .001<α<1, adjust as required
float Filtered_Temp = 21;        // Set a default filtered temperature value equal to the first measured value to reduce the ramp time
//float THRM_A0 =  -5.479495E+02 ;     //using TMP6131DYAR here on MSP430F5529LP
//float THRM_A1 = 7.540674E+02  ;
//float THRM_A2 =   -4.376661E+02 ;
//float THRM_A3 =   1.387438E+02  ;
//float THRM_A4 =   -1.366970E+01 ;

    float THRM_A0 =  -4.054532E+02 ;
    float THRM_A1 = 9.517609E+02  ;
    float THRM_A2 =   -7.891225E+02 ;
    float THRM_A3 =   3.701203E+02  ;
    float THRM_A4 =   2.121926E+01  ;




// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 115200 bps:
  Serial.begin(115200);
  Wire.begin(0);
  Wire.setTimeout(0);
  delay(1000);

  //    analogReference (DEFAULT);
      analogReference (INTERNAL1V5);
//      analogReference (INTERNAL2V5);
//      analogReference (EXTERNAL);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin A6:
  sensorValue = analogRead(sensorPin);
  // convert to voltage
  VTEMP = ((1.5 / 1023) * sensorValue);
  //convert to temp in C
  AMB_TEMP = ((THRM_A4 * powf(VTEMP, 4)) + (THRM_A3 * powf(VTEMP, 3)) + (THRM_A2 * powf(VTEMP, 2)) + (THRM_A1 *  powf(VTEMP, 1)) + THRM_A0); // 4th order regression to get temperature

  //  Serial.print(",");
  //  Serial.println(sensorValue);
  //
//    Serial.print(",");
//    Serial.println(VTEMP, 4);

  //  Serial.print(AMB_TEMP, 4);
  //  Serial.print(",");

  // Filter
  Meas_Temp = AMB_TEMP;        // It's assumed that you have read the ADC and calculated your temperature
  Filtered_Temp = Filtered_Temp - (Alpha * (Filtered_Temp - Meas_Temp));
  Serial.print(Filtered_Temp + 0, 4);  //set offset
  Serial.print(",");

  //Read from the TMP117
//  Wire.requestFrom(72, 2);
//  while (Wire.available())
//  {
//    int Byte = Wire.read(); //reads the first Byte
//    Byte = Byte << 8; // shifts the first byte by 8 making it the high byte valuexz
//    Byte += Wire.read(); // reads the next byte and appends to the first byte
//    double tmp117_temp = Byte * .0078125; //converts the data to temp
//    Serial.println(tmp117_temp, 4); // displays the data
//   //     Serial.print(",");
//  }
//  delay(50); // delay in between reads for stability
}

/*
  AnalogReadSerial TMP6
  Reads an analog input on pin 6, prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A6, and the outside pins to ~1.5V and ground.

  Hardware Required:
    MSP430FR2433 LaunchPad
    TMP6 with bias resistor
    hook-up wire

  This example code is in the public domain.


*/
#include <Wire.h>
int sensorPin = A6;    // select the input pin for the potentiometer
int sensorValue = 0;
float VTEMP = 0;
float AMB_TEMP = 0;
float Meas_Temp = 0;        //
float Alpha = 0.01;       // .001<α<1, adjust as required
float Filtered_Temp = 21;        // Set a default filtered temperature value equal to the first measured value to reduce the ramp time
//float THRM_A0 =  -5.479495E+02 ;     
//float THRM_A1 = 7.540674E+02  ;
//float THRM_A2 =   -4.376661E+02 ;
//float THRM_A3 =   1.387438E+02  ;
//float THRM_A4 =   -1.366970E+01 ;

    float THRM_A0 =  -4.054532E+02 ;   //using TMP6131DYAR here on MSP430FR2433LP
    float THRM_A1 = 9.517609E+02  ;
    float THRM_A2 =   -7.891225E+02 ;
    float THRM_A3 =   3.701203E+02  ;
    float THRM_A4 =   2.121926E+01  ;




// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 115200 bps:
  Serial.begin(115200);
  Wire.begin(0);
  Wire.setTimeout(0);
  delay(1000);

  //    analogReference (DEFAULT);
      analogReference (INTERNAL1V5);
//      analogReference (INTERNAL2V5);
//      analogReference (EXTERNAL);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin A6:
  sensorValue = analogRead(sensorPin);
  // convert to voltage
  VTEMP = ((1.5 / 1023) * sensorValue);
  //convert to temp in C
  AMB_TEMP = ((THRM_A4 * powf(VTEMP, 4)) + (THRM_A3 * powf(VTEMP, 3)) + (THRM_A2 * powf(VTEMP, 2)) + (THRM_A1 *  powf(VTEMP, 1)) + THRM_A0); // 4th order regression to get temperature

  //  Serial.print(",");
  //  Serial.println(sensorValue);
  //
//    Serial.print(",");
//    Serial.println(VTEMP, 4);

  //  Serial.print(AMB_TEMP, 4);
  //  Serial.print(",");

  // Filter
  Meas_Temp = AMB_TEMP;        // It's assumed that you have read the ADC and calculated your temperature
  Filtered_Temp = Filtered_Temp - (Alpha * (Filtered_Temp - Meas_Temp));
  Serial.print(Filtered_Temp + 0, 4);  //set offset
  Serial.print(",");

  //Read from the TMP117
//  Wire.requestFrom(72, 2);
//  while (Wire.available())
//  {
//    int Byte = Wire.read(); //reads the first Byte
//    Byte = Byte << 8; // shifts the first byte by 8 making it the high byte valuexz
//    Byte += Wire.read(); // reads the next byte and appends to the first byte
//    double tmp117_temp = Byte * .0078125; //converts the data to temp
//    Serial.println(tmp117_temp, 4); // displays the data
//   //     Serial.print(",");
//  }
//  delay(50); // delay in between reads for stability
}