MCP9801 datasheet(11/30 Pages) MICROCHIP

11 / 30 page

 2004 Microchip Technology Inc.

DS21909B-page 11

MCP9800/1/2/3

4.3.2

TEMPERATURE LIMIT-SET

The MCP9800/1/2/3 has a 16-bit read/write Tempera-

ture Limit-Set register (TSET) which contains a 9-bit data

in two’s compliment format. This data represents a

maximum temperature limit. If the ambient temperature

exceeds this specified limit, the MCP9800/1/2/3 asserts

an alert output. (Refer to Section 4.3.4.3 “ALERT Out-

put Configuration”).

This register uses the nine Most Significant bits (MSb)

and all other bits are don’t cares.

The power-up default value of TSET register is 80°C

<0 1010 0000>

in binary.

TEMPERATURE LIMIT-SET REGISTER (TSET)

Upper Half:

R/W-0

Sign

26 °C/bit

25 °C/bit

24 °C/bit

23 °C/bit

22 °C/bit

21 °C/bit

20 °C/bit

bit 15

bit 8

Lower Half:

R/W-0

R-0

2-1 °C/bit

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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