MCP9843 datasheet(24/62 Pages) MICROCHIP

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MCP9843/98243

DS22153C-page 24

5.1.3

UPPER/LOWER/CRITICAL

TEMPERATURE LIMIT REGISTERS

(TUPPER/TLOWER/TCRIT)

The MCP9843/98243 device has a 16-bit read/write

Event output Temperature Upper-Boundary Trip

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 MCP9843/98243

asserts an Event output. (Refer to 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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