MCP960X datasheet(31/57 Pages) MICROCHIP

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DS20005426G-page 31

MCP960X/L0X/RL0X

5.1.3

COLD-JUNCTION/AMBIENT

TEMPERATURE REGISTER (TC)

The

MCP960X/L0X/RL0X

integrates

ambient

temperature sensor which can be used to measure the

thermocouple cold-junction temperature. For accurate

measurement, the device will have to be placed at close

proximity to the thermocouple cold-junction to detect the

junction ambient temperature. This is a 16-bit

double-buffered, read-only register. The temperature

resolution is user-selectable to 0.0625°C/LSb or

0.25°C/LSb resolutions and setting the resolution

determines the temperature update rate, as shown in

Table 5-2.

EQUATION 5-3:

TEMPERATURE

CONVERSION

The temperature bits are in two’s complement format;

therefore, positive temperature data and negative

temperature data are computed differently, as shown

in Equation 5-3.

FIGURE 5-4:

Thermocouple

Cold-Junction Register (TC) Block Diagram.

Temperature

 0°C

TC = (UpperByte x 16 + LowerByte/16)

Temperature

 0°C

TC = (UpperByte x 16 + LowerByte/16) – 4096

TABLE 5-2:

RESOLUTION vs.

CONVERSION TIME

Resolution

Conversion

Time

(typical)

(Note 1)

0.0625°C

250 ms

ssss xxxx xxxx xxxx

0.25°C

63 ms

ssss xxxx xxxx xx00

Note 1:

‘s’ is Sign and ‘x’ is unknown bit.

Ambient Temperature

Sensor Core

Selectable Resolution:

- 0.0625°C

-0.25°C

(see Register 5-8)

Thermocouple

Cold-Junction

Temperature –TC

COLD-JUNCTION TEMPERATURE REGISTER - TC (READ ONLY)

R-0

SIGN

128°C

64°C

32°C

16°C

bit 15

bit 8

R-0

8°C

4°C

2°C

1°C

0.5°C

0.25°C

0.125°C

0.0625°C

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-0

TC: Data in Two’s Complement Format. Bits 15-12 are sign bits and the bits are set when the

temperature data is less than 0°C.

This register contains the thermocouple cold-junction temperature or the device ambient temperature

data. Bits 1 and 0 may remain clear (‘0’) depending on the status of the Resolution setting, bit 7 of

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