This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430G2553: Pairing the LMT85-Q1 analog temperature sensor to the MSP430G2553

Part Number: MSP430G2553
Other Parts Discussed in Thread: LMT85-Q1, MSP-FET

This is my circuit. I'm feeding the LMT85-Q1 from the P2.1 of the MCU. Pin 2 on the MCU (A0) is used for reading the output from the sensor. 

#include <msp430.h> 

 * main.c

// Declare & initialize some variables
volatile unsigned counter = 0;
volatile unsigned temp_arr[20];

void main(void)
	WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer
	// Feed the temp. sensor
	P2DIR = 0x02; 
	P2OUT = 0x02;

	// Set the ADC from the documentation
	ADC10CTL0 = SREF_0 + ADC10SHT_3 + ADC10ON + ADC10IE + MSC;
	ADC10CTL1 = INCH_0 + ADC10DIV_1 + ADC10SSEL_0 + CONSEQ_2;

	// Start ADC10 module
	ADC10CTL0 |= ENC + ADC10SC;

	// Enable interrupt(s)


#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void) { // change to ADC10_banana

    // interrupt logic goes here
    if(counter < 20) {
        // Dump ADC10MEM value into the <array> on position/index <counter>
        temp_arr[counter] = ADC10MEM;

        // Increment counter

    else {

        // Reset counter to avoid <array> "out of bounds"
        counter = 0;

        // Turn off ACD10
        ADC10CTL0 &= ~(ENC + ADC10SC);

The voltage returns do not correspond to the ambiental temperature: 

What am I missing?

According to the documentation, 408 mV translates to 138C. 

**Attention** This is a public forum