N4_32new/USER/ntc.c

#include "ntc.h"

u32 NTC_ADC_VALUE_SUM = 0;

float Get_Temperature(u16 ADC_VALUE)
{
	float Rp = 10000.0;          //分压电阻
	float Rn = 10000.0;          //在TN常温下的标称阻值
	float T2 = (273.15 + 25.0);  //开尔文温度，K度=273.15(绝对温度)+摄氏度
	float Bx = 3950.0;
	
	float Rt = 0.0;
	float valta = 0.0;
	
	valta = (float)ADC_VALUE*3.3/4095;
	
	Rt = (Rp*valta)/(3.3-valta);
	
	return (1/( log(Rt/Rn)/Bx+ (1/T2) )) - 273.15;//272.65
}