MCP960X datasheet(30/57 Pages) MICROCHIP

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DS20005426G-page 30

MCP960X/L0X/RL0X

5.1.2

THERMOCOUPLE JUNCTIONS

DELTA TEMPERATURE

This

contains

the

error

corrected

Thermocouple Hot-Junction temperature without the

Cold-Junction compensation. The error correction

methodology uses several coefficients to convert the

digitized Thermocouple EMF voltage to degree

Celsius. Each Thermocouple type has a unique set of

coefficients as specified by NIST, and these

coefficients are available in the configuration register

for user selection as shown in Figure 5-3.

EQUATION 5-2:

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 5-2.

FIGURE 5-3:

Thermocouple Hot-Junction

Temperature

 0°C

TΔ = (UpperByte x 16 + LowerByte / 16)

Temperature

 0°C

TΔ = (UpperByte x 16 + LowerByte / 16) - 4096

VIN+

VIN-

ADC code to

degree Celsius

conversion using

coefficients derived

from NIST look-up

table database

User-Selectable,

Thermocouple Types:

- Type K

- Type J

- Type T

- Type N

- Type S

- Type E

- Type B

- Type R

(see Register 5-6)

Thermocouple

Junctions Delta

Temperature – TΔ

Check if the ADC

code is within range

for the selected

thermocouple type

TΔ

Delta-Sigma

18-Bit

ADC Core

ADC

HOT-JUNCTION TEMPERATURE REGISTER -TΔ (READ-ONLY)

R-0

SIGN

1024°C

512°C

256°C

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

TΔ: Data in Two’s Complement Format. Bit 15 is the sign bit and it is set when the temperature data is

less than 0°C.

This register contains Thermocouple Hot-Junction temperature data without the cold-junction

compensation.

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