MCP19124 datasheet(149/236 Pages) MICROCHIP

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DS20005619A-page 149

MCP19124/5

25.0 INTERNAL TEMPERATURE

INDICATOR MODULE

The MCP19124/5 devices are equipped with a

temperature sensor designed to measure operating

temperature of the silicon die. The silicon die

temperature range of operation is from -40°C and

+125°C. The temperature sensing circuitry typically

ranges from -20°C to +125°C. The temperature

sensing circuit output is a voltage that is proportional to

the silicon die temperature. The output is internally

connected to the device Analog to Digital Converter.

25.1

Circuit Operation

This internal temperature measurement circuit is

always enabled.

FIGURE 25-1:

TEMPERATURE CIRCUIT

DIAGRAM

25.2

Temperature Output

The output of the circuit is measured using the internal

analog-to-digital converter. Channel 13 is reserved for

the temperature circuit output. Refer to Section 19.0

“Analog-to-Digital Converter (ADC) Module” for

detailed information.

The temperature of the silicon die can be calculated by

the ADC measurement by using Equation 25-1. A

factory-stored 10-bit ADC value for 30°C is located at

address 2084h. The temperature coefficient for this

circuit is is typically 14.0mV/°C +/-0.8mV/°C from -20°C

to +125°C. Other temperature readings can be

calculated from this 30°C mark as shown in Equation

25-1. Equation 25-1 is based on the ADC Reference

connected to the AVDD.

EQUATION 25-1:

SILICON DIE TEMPERATURE

ADC

MUX

VDD

ADC

CHS bits

(ADCON0 register)

VOUT

TEMP_DIE(

C 

ADC_READING (counts)

ADC_30

C_READING (counts

–



3.5(counts/

C 

-----------------------------------------------------------------------------------------------------------------------------------------------------30

C

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