MCP9802 Microchip Technology Inc., MCP9802 Datasheet - Page 12

• Manufacturer Part Number: MCP9802
• Description: 2-wire High-accuracy Temperature Sensor
• Manufacturer: Microchip Technology Inc.

MCP9800/1/2/3
4.3.3
The MCP9800/1/2/3 has a 16-bit read/write tempera-
ture hysteresis register (T
data in two’s compliment format. This register is used
to set a hysteresis for the T
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 T
<0 1001 0110> in binary.
REGISTER 4-4:
DS21909B-page 12
Upper Half:
bit 15
Legend:
R = Readable bit
- n = Value at POR
R/W-0
Sign
TEMPERATURE HYSTERESIS
REGISTER (T
2
R/W-0
6
°C/bit
Lower Half:
bit 7
2
-1
R/W-0
TEMPERATURE HYSTERESIS REGISTER (T
°C/bit
SET
HYST
HYST
2
R/W-0
5
limit. Therefore, the data
°C/bit
) that contains a 9-bit
HYST
)
R-0
W = Writable bit
‘1’ = Bit is set
0
register is 75°C
2
R/W-0
4
°C/bit
R-0
0
2
R/W-0
3
°C/bit
R-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
0
2
R/W-0
2
°C/bit
R-0
HYST
0
2
R/W-0
1
°C/bit
)
R-0
 2004 Microchip Technology Inc.
0
2
x = Bit is unknown
R/W-0
0
°C/bit
bit 8
R-0
0
R-0
0
bit 0