MCP9804-ESLASHMS datasheet(22/54 Pages) MICROCHIP

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MCP9804

DS22203A-page 22

5.1.2

UPPER/LOWER/CRITICAL

TEMPERATURE LIMIT REGISTERS

(TUPPER/TLOWER/TCRIT)

The MCP9804 has a 16-bit read/write Alert Output

Temperature Upper-Boundary register (TUPPER), a 16-

bit Lower-Boundary register (TLOWER) and a 16-bit

Critical Boundary 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 5.1.1) and the ambient temperature exceeds

the specified boundary or window, the MCP9804

asserts an Alert output. (Refer to

Section 5.2.3).

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

TCRIT) → ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b (NOTE)

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:

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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