Measuring temperature using LM335, MSP430g2553

Other Parts Discussed in Thread: LM335

Hello,

I am using LM335 to measure the temperature of the hand

so I am getting quite high values > 700 degree Celsius 

I am not sure why that is happening, I have the sensor connected to a ground pin through the negative terminal, and I used a 1 Kohm connected to Vcc and then to the positive terminal which is also connected to A1

I am sure of my code but I will show it just in case

#include <msp430g2553.h>

#ifndef TIMER0_A1_VECTOR
#define TIMER0_A1_VECTOR    TIMERA1_VECTOR
#define TIMER0_A0_VECTOR    TIMERA0_VECTOR
#endif

void FaultRoutine(void);
void ConfigWDT(void);
void ConfigClocks(void);
void ConfigLED(void);
void ConfigADC10(void);
void ConfigTimerA2(void);

//volatile int lightRead=0;
volatile float TRead=0;

int main(void) {
	volatile unsigned int i;

	ConfigWDT();
	ConfigClocks();
	ConfigLED();
	ConfigADC10();
	ConfigTimerA2();
	
	_BIS_SR(GIE);			//Enable global interrupts
	while(1);
}

void ConfigWDT(void)
 {
 WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
 }

void ConfigClocks(void)
 {
 if (CALBC1_1MHZ ==0xFF || CALDCO_1MHZ == 0xFF)
   FaultRoutine();		                    // If calibration data is erased
 				                            // run FaultRoutine()
  BCSCTL1 = CALBC1_1MHZ; 					// Set range
  DCOCTL = CALDCO_1MHZ;  					// Set DCO step + modulation
  BCSCTL3 |= LFXT1S_2;                      // LFXT1 = VLO
  IFG1 &= ~OFIFG;                           // Clear OSCFault flag
  BCSCTL2 |= SELM_0 + DIVM_3 + DIVS_3;      // MCLK = DCO/8, SMCLK = DCO/8
  BCSCTL1 |= DIVA_3;						// ACLK -> 1.5 KHz
 }

void FaultRoutine(void)
 {
   P1OUT = BIT0;                            // P1.0 on (red LED)
   while(1); 			                    // TRAP
 }

void ConfigLED(void){
  P1DIR = BIT0+BIT6;                             // P1.0 (red) output
  P1OUT = 0;                                // LED off
}

void ConfigADC10(void){
	ADC10CTL1 = INCH_1 + ADC10DIV_1;		//Choose input channel and choose clock frequency
	ADC10CTL0 |= SREF_0 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;    //Vcc to Vss as reference and turn on
	_delay_cycles(30);                         						// Wait for ADC Ref to settle
	ADC10AE0 = BIT1;    							//Enable ADC input through PIN 1.3

}

void ConfigTimerA2(void){
	CCTL0 = CCIE;							// Allow periodic interrupt
	TACTL = TASSEL_1 + MC_1+ ID_3;
	CCR0 = 187;							// Enable interrupts every 1 second


}

#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A_ISR (void){

	while (!(ADC10IFG & ADC10CTL0)){ 							 // Check if the conversion is completed
		ConfigADC10();
		ADC10CTL0 |= ENC + ADC10SC;								// Sampling and conversion start
	}
	TRead = ADC10MEM;
	TRead = TRead - 273.15;
	ADC10CTL0 &= ~ADC10IFG;


	ADC10CTL0 &= ~ENC;				   								// Disable ADC conversion
	ADC10CTL0 &= ~(REFON + ADC10ON);        						// Reference and ADC10 off

	CCR0 += 187;
}