MCP9844 datasheet(20/44 Pages) MICROCHIP

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MCP9844

DS20005192A-page 20

 2013 Microchip Technology Inc.

5.1.3

UPPER/LOWER/CRITICAL

TEMPERATURE LIMIT REGISTERS

(TUPPER/TLOWER/TCRIT)

The MCP9844 device has a 16-bit read/write Event

Output Temperature Upper-Boundary Trip register

(TUPPER), a 16-bit Lower-Boundary Trip register

(TLOWER) and a 16-bit Critical Boundary Trip register

(TCRIT) that contains 11-bit data in two’s complement

format (0.25°C). This data represents the maximum

and minimum temperature boundary or temperature

window that can be used to monitor ambient

temperature. If this feature is enabled (Section 5.1.2

“Sensor Configuration Register (CONFIG)”

) and the

ambient temperature exceeds the specified boundary

or window, the MCP9844 asserts an event output.

(Refer

Section 5.2.3

“Event

Output

Configuration”

UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER (TUPPER/TLOWER/

TCRIT)  ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b (Note 1)

U-0

R/W-0

——

—

Sign

27°C

26°C

25°C

24°C

bit 15

bit 8

R/W-0

U-0

23°C

22°C

21°C

20°C

2-1°C

2-2°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 15-13

Unimplemented:

Read as ‘0’

bit 12

Sign:

=TA 0°C

=TA  0°C

bit 11-2

TUPPER/TLOWER/TCRIT:

Temperature boundary trip data in two’s complement format.

bit 1-0

Unimplemented:

Read as ‘0’

Note 1:

This table shows two 16-bit registers for TUPPER, TLOWER and TCRIT located at ‘0000 0010b’,

‘0000 0011b’ and ‘0000 0100b’, respectively.

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