MSP430F5438A ADC片内温度读取设置及转化公式

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//******************************************************************************
//  MSP430F543xA Demo - ADC12_A, Sample A10 Temp and Convert to oC and oF
//
//  Description: A single sample is made on A10 with reference to internal
//  1.5V Vref. Software sets ADC12SC to start sample and conversion - ADC12SC
//  automatically cleared at EOC. ADC12 internal oscillator times sample
//  and conversion. In Mainloop MSP430 waits in LPM4 to save power until
//  ADC10 conversion complete, ADC12_ISR will force exit from any LPMx in
//  Mainloop on reti.
//  ACLK = n/a, MCLK = SMCLK = default DCO ~ 1.045MHz, ADC12CLK = ADC12OSC
//
//  Uncalibrated temperature measured from device to devive will vary due to
//  slope and offset variance from device to device - please see datasheet.
//  Note:Use the TLV calibrated temperature to measure temperature 
// (the TLV CALIBRATED DATA IS STORED IN THE INFORMATION SEGMENT, SEE DEVICE DATASHEET)
//
//                MSP430F5438A
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |A10              |
//
//   F. Chen
//   Texas Instruments Inc.
//   Dec. 2012
//   Built with IAR Embedded Workbench Version: 5.51.1 & Code Composer Studio V5.2.1
//******************************************************************************
#include <msp430.h>

#define CALADC12_15V_30C  *((unsigned int *)0x1A1A)   // Temperature Sensor Calibration-30 C
                                                      //See device datasheet for TLV table memory mapping
#define CALADC12_15V_85C  *((unsigned int *)0x1A1C)   // Temperature Sensor Calibration-85 C

unsigned int temp;
volatile float temperatureDegC;
volatile float temperatureDegF;

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  
  /* Initialize the shared reference module */ 
  REFCTL0 |= REFMSTR + REFVSEL_0 + REFON;    // Enable internal 1.5V reference
  
  /* Initialize ADC12_A */ 
  ADC12CTL0 = ADC12SHT0_8 + ADC12ON;		    // Set sample time 
  ADC12CTL1 = ADC12SHP;                     // Enable sample timer
  ADC12MCTL0 = ADC12SREF_1 + ADC12INCH_10;  // ADC input ch A10 => temp sense 
  ADC12IE = 0x001;                          // ADC_IFG upon conv result-ADCMEMO
  
  __delay_cycles(75);                       // delay to allow Ref to settle
                                            // based on default DCO frequency.
                                            // See Datasheet for typical settle
                                            // time.
  ADC12CTL0 |= ADC12ENC;

  while(1)
  {
    ADC12CTL0 &= ~ADC12SC; 
	ADC12CTL0 |= ADC12SC;                   // Sampling and conversion start

    __bis_SR_register(LPM4_bits + GIE);     // LPM4 with interrupts enabled
    __no_operation();
	
    // Temperature in Celsius. See the Device Descriptor Table section in the
    // System Resets, Interrupts, and Operating Modes, System Control Module
    // chapter in the device user's guide for background information on the
    // used formula.
    temperatureDegC = (float)(((long)temp - CALADC12_15V_30C) * (85 - 30)) /
            (CALADC12_15V_85C - CALADC12_15V_30C) + 30.0f;

    // Temperature in Fahrenheit Tf = (9/5)*Tc + 32
    temperatureDegF = temperatureDegC * 9.0f / 5.0f + 32.0f;
    
    __no_operation();                       // SET BREAKPOINT HERE
  }
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC12_VECTOR))) ADC12ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(ADC12IV,34))
  {
  case  0: break;                           // Vector  0:  No interrupt
  case  2: break;                           // Vector  2:  ADC overflow
  case  4: break;                           // Vector  4:  ADC timing overflow
  case  6:                                  // Vector  6:  ADC12IFG0
    temp = ADC12MEM0;                       // Move results, IFG is cleared
    __bic_SR_register_on_exit(LPM4_bits);   // Exit active CPU
    break;
  case  8: break;                           // Vector  8:  ADC12IFG1
  case 10: break;                           // Vector 10:  ADC12IFG2
  case 12: break;                           // Vector 12:  ADC12IFG3
  case 14: break;                           // Vector 14:  ADC12IFG4
  case 16: break;                           // Vector 16:  ADC12IFG5
  case 18: break;                           // Vector 18:  ADC12IFG6
  case 20: break;                           // Vector 20:  ADC12IFG7
  case 22: break;                           // Vector 22:  ADC12IFG8
  case 24: break;                           // Vector 24:  ADC12IFG9
  case 26: break;                           // Vector 26:  ADC12IFG10
  case 28: break;                           // Vector 28:  ADC12IFG11
  case 30: break;                           // Vector 30:  ADC12IFG12
  case 32: break;                           // Vector 32:  ADC12IFG13
  case 34: break;                           // Vector 34:  ADC12IFG14
  default: break;
  }
}

我用了你的程序，1.5V temperatureDegC = 18度左右，temperatureDegF = 65左右，摄氏度和华氏度应该差273度吧？？？想知道

#define CALADC12_15V_30C *((unsigned int *)0x1A1A) // Temperature Sensor Calibration-30 C

                                                                                                      //See device datasheet for TLV table memory mapping

#define CALADC12_15V_85C *((unsigned int *)0x1A1C) // Temperature Sensor Calibration-85 C

这些数据是从哪里得到的，现在我想用2.5V参考电压如何修改呢，非常感谢您的答复！！！

因为每个芯片出厂的时候存都在差异，在出厂的时候，TI做了一些典型温度下的校准，存在对应的位置里，可以在Datasheet里面TLV中看到。

楼上那个表格没截全，不同的参考电压，校准参数是不同的。具体可以看数据手册 http://www.ti.com.cn/cn/lit/ds/symlink/msp430f5438a.pdf 第92页