MCP9808 datasheet(22/52 Pages) MICROCHIP

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MCP9808

DS25095A-page 22

5.1.2

UPPER/LOWER/CRITICAL

TEMPERATURE LIMIT REGISTERS

(TUPPER/TLOWER/TCRIT)

The MCP9808 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 contain 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.

this

feature

enabled

(

Section 5.1.1

“Sensor

Configuration

(CONFIG)”) and the ambient temperature exceeds the

specified boundary or window, the MCP9808 asserts an

Alert output. (Refer to

Section 5.2.3 “Alert Output

Configuration”).

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

(

→ ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b)(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: Sign bit

=TA ≥ 0°C

=TA < 0°C

bit 11-2

TUPPER/TLOWER/TCRIT: Temperature Boundary bits

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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