MCP960X datasheet(29/57 Pages) MICROCHIP

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DS20005426G-page 29

MCP960X/L0X/RL0X

5.1

Thermocouple Temperature

Sensor Registers

This device integrates three Temperature registers that

are used to read the cold and hot-junction temperatures,

and the sum of the two junctions to output the absolute

thermocouple temperature. In addition, the Raw ADC

Data register, which is used to derive the thermocouple

temperature, is available. The following sections

describe each register in detail.

5.1.1

THERMOCOUPLE TEMPERATURE

This register contains the cold-junction compensated and

error-corrected thermocouple temperature in degree

Celsius. The temperature data from this register is the

absolute Thermocouple Hot-Junction temperature, TH, to

the specified accuracy (see Section 1.0 “Electrical

Characteristics”. TH is the sum of the values in the TΔ

and TC registers, as shown in Figure 5-2.

EQUATION 5-1:

TEMPERATURE

CONVERSION

The temperature bits are in two’s complement format;

therefore, positive temperature data and negative

temperature

data

are

computed

differently.

Equation 5-1 shows how to convert the binary data to

temperature in degree Celsius.

FIGURE 5-2:

Thermocouple Temperature

Temperature

 0°C

TH = (UpperByte x 16 + LowerByte/16)

Temperature

 0°C

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

VIN+

VIN-



Temperature

Sensor Core

ADC Core

Delta-Sigma

18-Bit

Error Corrected

Temperature

ADC

Thermocouple

Temperature

TΔ

THERMOCOUPLE TEMPERATURE REGISTER - TH (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

TH: 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 the error corrected and cold-junction compensated thermocouple temperature.

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