MCP960X datasheet(27/57 Pages) MICROCHIP

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DS20005426G-page 27

MCP960X/L0X/RL0X

The MCP960X/L0X/RL0X device has several registers

that are user-accessible. These registers include the

Thermocouple Temperature (cold-junction compen-

sated), Hot-Junction Temperature, Cold-Junction Tem-

perature, Raw ADC Data, user-programmable Alert

Limit registers, and STATUS and Configuration regis-

ters.

The Temperature and the Raw ADC Data registers are

read-only registers, used to access the thermocouple

and the ambient temperature data. In addition, the four

Alert Temperature registers are individually controlled,

and can be used to detect a rising and/or a falling

temperature change. If the ambient temperature drifts

beyond

the

user-specified

limits,

the

MCP960X/L0X/RL0X device outputs an alert flag at the

corresponding pin (refer to Section 5.3.3 “Alert Con-

figuration Registers”). The alert limits can also be

used to detect critical temperature events.

The MCP960X/L0X/RL0X also provides STATUS and

Configuration registers, which allow users to detect

device statuses. The Configuration registers provide

various features, such as adjustable temperature

measurement resolution and Shutdown modes. The

thermocouple types can also be selected using the

Configuration registers.

The registers are accessed by sending a Register

Pointer to the MCP960X/L0X/RL0X using the serial

interface. This

is an

8-bit

write-only

pointer.

U-0

W-0

——

P[5:0]

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 7-6

Unimplemented: Read as ‘0’

bit 5-0

P[5:0]: Pointer bits

0000 0000 = Thermocouple Hot-Junction register, TH

0000 0001 = Junctions Temperature Delta register, TΔ

0000 0010 = Cold-Junction Temperature register, TC

0000 0011 = Raw ADC Data register

0000 0100 = STATUS register

0000 0101 = Thermocouple Sensor Configuration register

0000 0110 = Device Configuration register

0000 1000 = Alert 1 Configuration register

0000 1001 = Alert 2 Configuration register

0000 1010 = Alert 3 Configuration register

0000 1011 = Alert 4 Configuration register

0000 1100 = Alert 1 Hysteresis register, THYST1

0000 1101 = Alert 2 Hysteresis register, THYST2

0000 1110 = Alert 3 Hysteresis register, THYST3

0000 1111 = Alert 4 Hysteresis register, THYST4

0001 0000 = Temperature Alert 1 Limit register, TALERT1

0001 0001 = Temperature Alert 2 Limit register, TALERT2

0001 0010 = Temperature Alert 3 Limit register, TALERT3

0001 0011 = Temperature Alert 4 Limit register, TALERT4

0010 0000 = Device ID/Revision register

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