MCP9805T-BESLASHST datasheet(13/34 Pages) MICROCHIP

13 / 34 page

DS21977B-page 13

MCP9805

4.1.3

TEMPERATURE EVENT

UPPER/LOWER/CRITICAL

BOUNDARY TRIP REGISTERS

(TUPPER/TLOWER/TCRIT)

The MCP9805 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 compliment format

(0.25 °C/LSb). This data represents the maximum and

minimum

temperature

boundary

temperature

window that can be used to monitor ambient tempera-

ture. If this feature is enabled (Section 4.1.2 “Sensor

Configuration Register (CONFIG)”) and the ambient

temperature exceeds the specified boundary or

window, the MCP9805 asserts an Event output. (Refer

to Section 4.2.3 “Event Output Configuration”).

UPPER/LOWER/CRITICAL TEMPERATURE BOUNDARY TRIP REGISTERS

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

bit 15-13

Unimplemented: Read as ‘0’

bit 12

SIGN bit:

=TA ≥ 0°C

=TA < 0°C

bit 11-2

TUPPER/TLOWER/TCRIT bits:

Temperature boundary trip data in two’s compliment format.

bit 1-0

Unimplemented: Read as ‘0’

Note: This table reflects the three 16-bit registers TUPPER, TLOWER and TCRIT located at address ‘0000 0010’b,

‘0000 0011’b and ‘0000 0100’b, respectively (see Register 4-1).

Upper-Half:

U-0

R/W-0

——

—

SIGN

27 °C/LSb

26 °C/LSb 25 °C/LSb 24 °C/LSb

bit 15

bit 8

Lower-Half:

R/W-0

U-0

23 °C/LSb

22 °C/LSb

21 °C/LSb

20 °C/LSb

2-1 °C/LSb 2-2 °C/LSb

—

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

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