PIC18F46K80T-I/SP データシートの表示（PDF） - Microchip Technology

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PIC18F46K80T-I/SP

28/40/44/64-Pin, Enhanced Flash Microcontrollers with ECAN™ and nanoWatt XLP Technology

Microchip Technology 

PIC18F66K80 FAMILY

18.9 Measuring Temperature with the

CTMU Module

The CTMU, along with an internal diode, can be used

to measure the temperature. The A/D can be con-

nected to the internal diode and the CTMU module can

source the current to the diode. The A/D reading will

reflect the temperature. With the increase, the A/D

readings will go low. This can be used for low-cost

temperature measurement applications.

EXAMPLE 18-6: ROUTINE FOR TEMPERATURE MEASUREMENT USING INTERNAL DIODE

// Initialize CTMU

CTMUICON = 0x03;

CTMUCONHbits.CTMUEN = 1;

CTMUCONLbits.EDG1STAT = 1;

// Initialize ADC

ADCON0 = 0xE5;

ADCON1 = 0x00;

ADCON2 = 0xBE;

// Enable ADC and connect to Internal diode

//Right Justified

ADCON0bits.GO = 1;

while(ADCON0bits.G0);

Temp = ADRES;

// Start conversion

// Read ADC results (inversely proportional to temperature)

Note: The temperature diode is not calibrated or standardized; the user must calibrate the diode to their application.

 2010-2012 Microchip Technology Inc.

DS39977F-page 251

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