Datasheet

 2015-2017 Microchip Technology Inc. DS20005426C-page 27
MCP9600
5.1.4 ANALOG-TO-DIGITAL
CONVERTER (ADC)
The MCP9600 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
(27)
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/32 µV 20 ms 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.
2: See Section 6.2.2 “Conversion Time vs.
Self-Heat”.
V
IN+
V
IN-
Selectable Resolutions:
- 18 bit
- 16 bit
- 14 bit
- 12 bit
(see Register 5-7)
Raw ADC
Code Register
ADC Core
ADC
Delta-Sigma
REGISTER 5-5: ADC SAMPLE: 24-BIT REGISTER
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
SIGN ADC Data
bit 23 bit 16
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
ADC Data
bit 15 bit 8
R-0 R-0 R-0 R-0 R-0 R-0 R-0 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<23:0>: Raw ADC Data bits
Includes sign bits.