Microchip Technology TMPSNSRD-TCPL1 데이터 시트
MCP9804
DS22203C-page 22
© 2009-2012 Microchip Technology Inc.
5.1.2
UPPER/LOWER/CRITICAL
TEMPERATURE LIMIT REGISTERS
(T
TEMPERATURE LIMIT REGISTERS
(T
UPPER
/T
LOWER
/T
CRIT
)
The MCP9804 has a 16-bit read/write Alert Output
Temperature Upper Boundary register (T
Temperature Upper Boundary register (T
UPPER
), a 16-bit
Lower Boundary register (T
LOWER
) and a 16-bit Critical
Boundary register (T
CRIT
) that contain 11-bit 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
(
temperature window that can be used to monitor
ambient temperature. If this feature is enabled
(
) and the ambient temperature exceeds the
specified boundary or window, the MCP9804 asserts an
Alert output. (Refer to
Alert output. (Refer to
).
REGISTER 5-3:
T
UPPER
/T
LOWER
/T
CRIT:
UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER
(
→ ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b)
(
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
Sign
2
7
°C
2
6
°C
2
5
°C
2
4
°C
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
2
3
°C
2
2
°C
2
1
°C
2
0
°C
2
-1
°C
2
-2
°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
bit 15-13
Unimplemented: Read as ‘0’
bit 12
Sign: Sign bit
0
= T
A
≥ 0°C
1
= T
A
< 0°C
bit 11-2
T
UPPER
/T
LOWER
/T
CRIT
: Temperature Boundary bits
Temperature boundary trip data in two’s complement format.
bit 1-0
Unimplemented: Read as ‘0’
Note 1:
This table shows two 16-bit registers for T
UPPER
, T
LOWER
and T
CRIT
, located at ‘0000 0010b’,
‘0000 0011b’ and ‘0000 0100b’, respectively.