MCP9804 Microchip Technology, MCP9804 Datasheet - Page 22

• Manufacturer Part Number: MCP9804
• Description: Accuracy Digital Temperature Sensor
• Manufacturer: Microchip Technology

MCP9804
5.1.2
The MCP9804 has a 16-bit read/write Alert Output
Temperature Upper-Boundary register (T
bit Lower-Boundary register (T
Critical Boundary register (T
data in two’s complement format (0.25°C). This data
represents the maximum and minimum temperature
boundary or temperature window that can be used to
monitor ambient temperature. If this feature is enabled
(Section 5.1.1) and the ambient temperature exceeds
the specified boundary or window, the MCP9804
asserts an Alert output. (Refer to Section 5.2.3).
REGISTER 5-3:
DS22203A-page 22
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15-13
bit 12
bit 11-2
bit 1-0
Note:
R/W-0
2
U-0
—
3
°C
UPPER/LOWER/CRITICAL
TEMPERATURE LIMIT REGISTERS
(T
This table shows two 16-bit registers for T
‘0000 0011b’ and ‘0000 0100b’, respectively.
UPPER
Unimplemented: Read as ‘0’
Sign:
0 =
1 =
T
Temperature boundary trip data in two’s complement format.
Unimplemented: Read as ‘0’
UPPER
R/W-0
2
/T
U-0
—
2
UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER (T
T
T
T
°C
LOWER
A
A
CRIT
/T
≥ 0°C
< 0°C
LOWER
) → ADDRESS
CRIT
/T
W = Writable bit
‘1’ = Bit is set
LOWER
CRIT
/T
) that contains 11-bit
R/W-0
CRIT
2
U-0
—
1
)
°C
:
) and a 16-bit
UPPER
‘0000 0010’b/‘0000 0011’b/‘0000 0100’b
), a 16-
R/W-0
R/W-0
2
Sign
0
°C
UPPER
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
R/W-0
2
2
-1
7
, T
°C
°C
LOWER
and T
R/W-0
R/W-0
2
2
-2
6
°C
°C
CRIT
© 2009 Microchip Technology Inc.
x = Bit is unknown
located at ‘0000 0010b’,
R/W-0
2
U-0
5
—
°C
UPPER
(NOTE)
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/T
LOWER
R/W-0
2
U-0
4
—
°C
bit 8
bit 0
/