MCP9808 MICROCHIP [Microchip Technology], MCP9808 Datasheet - Page 22

• Manufacturer Part Number: MCP9808
• Manufacturer: MICROCHIP [Microchip Technology]

MCP9808
5.1.2
The MCP9808 has a 16-bit read/write Alert Output
Temperature Upper Boundary register (T
Lower Boundary register (T
Boundary register (T
two’s complement format (0.25°C). This data represents
REGISTER 5-3:
DS25095A-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 1:
R/W-0
2
U-0
—
3
°C
This table shows two 16-bit registers for T
‘0000 0011b’ and ‘0000 0100b’, respectively.
UPPER/LOWER/CRITICAL
TEMPERATURE LIMIT REGISTERS
(T
UPPER
Unimplemented: Read as ‘0’
Sign: Sign bit
0 = T
1 = T
T
Temperature boundary trip data in two’s complement format.
Unimplemented: Read as ‘0’
UPPER
R/W-0
2
/T
U-0
CRIT
—
2
A
A
T
(→ ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b)
°C
LOWER
UPPER
≥ 0°C
< 0°C
/T
) that contain 11-bit data in
LOWER
LOWER
/T
/T
W = Writable bit
‘1’ = Bit is set
CRIT
LOWER
/T
) and a 16-bit Critical
R/W-0
CRIT
2
U-0
—
1
)
°C
: Temperature Boundary bits
UPPER
/T
CRIT
), a 16-bit
UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER
R/W-0
R/W-0
Sign
2
0
°C
UPPER
, T
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
LOWER
R/W-0
R/W-0
2
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
(CONFIG)”) and the ambient temperature exceeds the
specified boundary or window, the MCP9808 asserts an
Alert output. (Refer to
Configuration”).
2
-1
7
°C
°C
and T
CRIT
R/W-0
R/W-0
2
2
, located at ‘0000 0010b’,
-2
6
“Sensor
°C
°C
© 2011 Microchip Technology Inc.
Section 5.2.3 “Alert Output
x = Bit is unknown
Configuration
R/W-0
2
U-0
5
—
°C
(1)
R/W-0
2
U-0
Register
4
—
°C
bit 8
bit 0