MCP9803-MSLASHMSG datasheet(20/30 Pages) MICROCHIP

20 / 30 page

MCP9800/1/2/3

DS21909C-page 20

 2010 Microchip Technology Inc.

5.3.3

TEMPERATURE HYSTERESIS

The

MCP9800/1/2/3

has

16-bit

read/write

Temperature Hysteresis register 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 5.3.4.3 “ALERT Output Configuration”

This register uses the nine Most Significant bits (MSbs)

and all other bits are “don’t cares”.

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

or <0100 1011 0>b in binary.

TEMPERATURE HYSTERESIS REGISTER (THYST) – ADDRESS <0000 0010>b

Upper Half:

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

R/W-1

Sign

26 °C

25 °C

24 °C

23 °C

22 °C

21 °C

20 °C

bit 15

bit 8

Lower Half:

R/W-0

R-0

2-1 °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

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