MCP960X datasheet(32/57 Pages) MICROCHIP

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DS20005426G-page 32

MCP960X/L0X/RL0X

5.1.4

ANALOG-TO-DIGITAL

CONVERTER (ADC)

The MCP960X/L0X/RL0X uses an 18-bit Delta-Sigma

Analog-to-Digital Converter to digitize the Thermocouple

EMF voltage and the data is available in the ADC register.

The ADC measurement resolution is selectable, which

enables the user to choose faster conversion times with

reduced resolution. This feature is useful to detect fast

transient temperatures.

FIGURE 5-5:

Delta-Sigma

Analog-to-Digital Converter, ADC Core Block

Diagram.

TABLE 5-3:

ADC RESOLUTION(32)

Resolution/

Sensitivity

(typical)

Conversion

Time

(typical)

Raw ADC Register

Bit Format

(Note 1)

18-bit/2 µV

320 ms

ssss sssx xxxx xxxx

xxxx xxxx

16-bit/8 µV

80 ms

ssss sssx xxxx xxxx

xxxx xx00

14-bit/32µV

20ms

ssss sssx xxxx xxxx

xxxx 0000

12-bit/128 µV

5 ms

ssss sssx xxxx xxxx

xx00 0000

Note 1:

‘s’ is the Sign bit and ‘x’ is the ADC data bit.

See Section 6.2.2 “Conversion Time vs.

Self-Heat”.

VIN+

VIN-

Selectable Resolutions:

- 18-bit

- 16-bit

- 14-bit

- 12-bit

(see Register 5-7)

Raw ADC

Code Register

ADC Core

ADC

Delta-Sigma

24-BIT ADC REGISTER (READ-ONLY)

R-0

SIGN

ADC Data

bit 23

bit 16

R-0

ADC Data

bit 15

bit 8

R-0

ADC Data

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 23-0

ADC Data: Raw ADC Raw ADC data in Two's Compliment Format. Bits 23-18 are sign bits and the

bits are set when the ADC data is less than 0 micro-volt.

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