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MCP9800/1/2/3
5.3.3
TEMPERATURE HYSTERESIS
REGISTER (T HYST )
The MCP9800/1/2/3 has a 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 T SET 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 T HYST register is 75°C,
or <0100 1011 0>b in binary.
REGISTER 5-4:
Upper Half:
TEMPERATURE HYSTERESIS REGISTER (T HYST ) – ADDRESS < 0000 0010 >b
R/W-0
R/W-1
R/W-0
R/W-0
R/W-1
R/W-0
R/W-1
R/W-1
Sign
2
6 °C
2 5 °C
2 4 °C
2 3 °C
2 2 °C
2 1 °C
2 0 °C
bit 15
Lower Half:
bit 8
R/W-0
2 -1 °C
R-0
0
R-0
0
R-0
0
R-0
0
R-0
0
R-0
0
R-0
0
bit 7
Legend:
bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
DS21909D-page 20
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
? 2010 Microchip Technology Inc.
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