MSP430FG437: Does MSP430FG437 have internal temp sensor calibration data or TLV table?

Hi Janet,

Thanks for posting your question to E2E. The MSP430FG437 does have an integrated temperature sensor as part of the ADC12 module. Here's a figure copied from the user's guide illustrating how channel 1010b is connected to the temperature sensor. Section 28.2.8 in the user's guide discusses how to use it.

Unlike some of our newer devices, I couldn't find TLV data available in the MSP430FG437 datasheet. I did find a code example that demonstrates how to use the internal temperature sensor, but it does not show how to calibrate the sensor. Thus, I suspect that you'll need to calibrate (eliminate the offset of) the temp sensor manually for each device.

fet430_adc12_10.c

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//******************************************************************************
//  MSP-FET430P430 Demo - ADC12, Using the Temperature Sensor
//
//  This example shows how to use the intergrated temperature sensor to measure
//  temperature. When the temperature diode channel (A10) is selected for
//  conversion, the internal reference is automatically turned on as the source
//  for the sensor. Note however, that it is NOT automatically selected for the
//  conversion.  Any available reference can be used for the conversion.  In
//  this example, a single conversion is performed of the temperature diode.
//  The temperature is then calculated in degrees C and F, based on the A/D
//  conversion value. Test by setting and running to a break point at "_NOP()".
//  To view the temperature open a watch window with the debugger and view DegC
//  and DegF.
//  ACLK = n/a, MCLK = SMCLK = default DCO, ADC12CLK = ADC12OSC
//
//  Note: This example does not perform a calibration on the temperature sensor
//  A calibration of the temperature senosr may be necessary in an application.
//  see the device datasheet for the temperature sensor specification.
//
//               MSP430FG439
//             ---------------
//            |               |
//            |A10 (Temp)     |
//            |               |
//
//  M. Mitchell
//  Texas Instruments Inc.
//  Feb 2005
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.21A
//******************************************************************************
#include <msp430.h>

static unsigned int ADCresult;
static volatile unsigned long int DegC, DegF;

int main(void)
{
  volatile unsigned int i;
  WDTCTL = WDTPW+WDTHOLD;                   // Stop watchdog timer
  ADC12CTL0 = ADC12ON+REFON+REF2_5V+SHT0_6; // Setup ADC12, ref., sampling time
  ADC12CTL1 = SHP;                          // Use sampling timer
  ADC12MCTL0 = INCH_10+SREF_1;              // Select channel A10, Vref+
  ADC12IE = 0x01;                           // Enable ADC12IFG.0

  for (i=0; i<0x3600; i++)                  // Delay for reference start-up
  {
  }

  ADC12CTL0 |= ENC;                         // Enable conversions
  __enable_interrupt();                     // Enable interrupts

  while(1)
  {
    ADC12CTL0 |= ADC12SC;                   // Start conversion
    __bis_SR_register(LPM0_bits);           // Enter LPM0

    //  DegC = (Vsensor - 986mV)/3.55mV
    //  Vsensor = (Vref)(ADCresult)/4095)
    //  DegC -> ((ADCresult - 1615)*704)/4095
    DegC = ((((long)ADCresult-1615)*704)/4095);
    DegF = ((DegC * 9/5)+32);               // Calculate DegF
    __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
{
  ADCresult = ADC12MEM0;                    // Move results, IFG is cleared
  __bic_SR_register_on_exit(LPM0_bits);     // Clear LPM0
}

Regards,

James