MCP9800 Ver la hoja de datos (PDF) - Microchip Technology
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MCP9800 Datasheet PDF : 42 Pages
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MCP9800/1/2/3
5.3.3 TEMPERATURE HYSTERESIS
REGISTER (THYST)
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 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.
REGISTER 5-4:
Upper Half:
TEMPERATURE HYSTERESIS REGISTER (THYST) – ADDRESS <0000 0010>b
R/W-0
Sign
R/W-1
26 °C
R/W-0
25 °C
R/W-0
24 °C
R/W-1
23 °C
R/W-0
22 °C
R/W-1
21 °C
R/W-1
20 °C
bit 15
bit 8
Lower Half:
R/W-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2-1 °C
0
0
0
0
0
0
0
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
DS21909D-page 20
2010 Microchip Technology Inc.
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