MCP9803 datasheet(12/30 Pages) MICROCHIP

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MCP9800/1/2/3

DS21909B-page 12

 2004 Microchip Technology Inc.

4.3.3

TEMPERATURE HYSTERESIS

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

ture hysteresis register (THYST) that contains a 9-bit

data in two’s compliment format. This register is used

to set a hysteresis for the TSET limit. Therefore, the data

represents a minimum temperature limit. If the ambient

temperature drifts below the specified limit, the

MCP9800/1/2/3 asserts an alert output (refer to

Section 4.3.4.3 “ALERT Output Configuration”).

This register uses the nine Most Significant bits (MSb)

and all other bits are don’t cares.

The power-up default value of THYST register is 75°C

<0 1001 0110>

in binary.

TEMPERATURE HYSTERESIS REGISTER (THYST)

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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