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ADT7301ART датащи(PDF) 11 Page - Analog Devices

номер детали ADT7301ART
подробное описание детали  13-Bit, 0.5C Accurate, MicroPower Digital Temperature Sensor in 6-Lead SOT-23
PDF  14 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADT7301ART датащи(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
ADT7301
Rev. PrJ | Page 11 of 14
#include <16F873.h>
#device adc=8
#use delay(clock=4000000)
#fuses NOWDT,XT, PUT, NOPROTECT, BROWNOUT, LVP
#BIT CKP = 0x14.4
#define CS PIN_A1
void main(){
int MSByte,LSByte;
long int ADC_Temp_Code;
float TempVal,ADC_Temp_Code_dec;
setup_spi(spi_master);
//Pic is set up as Master device.
CKP = 1;
//Idle state of clock is high.
do{
delay_ms(10);
//Allow time for conversions.
Output_low(CS);
//Pull CS low.
delay_us(10);
//CS to SCLK setup time.
MSByte = SPI_Read(0);
//The first byte is clocked in.
LSByte = SPI_Read(0);
//The second byte is clocked in.
delay_us(10);
//SCLK to CS setup time.
Output_High(CS);
//Bring CS high.
MSByte = 0x03;
LSByte = 0x20;
ADC_Temp_Code = make16(MSByte,LSByte);
//16bit ADC code is stored ADC_Temp_Code.
ADC_Temp_Code_dec = (float)ADC_Temp_Code;
//Covert to float for division.
if ((0x2000 & ADC_Temp_Code) == 0x2000)
//Check sign bit for negative value.
{
TempVal = (ADC_Temp_Code_dec - 16384)/32;
//Conversion formula if negative temperature.
}
else
{
TempVal = (ADC_Temp_Code_dec/32);
//Conversion formula if positive temperature.
}
}while(True);
//Temperature value stored in TempVal.
}



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