MCP9805T-BE/ST Microchip Technology, MCP9805T-BE/ST Datasheet - Page 13

• Manufacturer Part Number: MCP9805T-BE/ST
• Description: IC,TEMPERATURE SENSOR,TSSOP,8PIN,PLASTIC
• Manufacturer: Microchip Technology

Specifications of MCP9805T-BE/ST

• Rohs Compliant: YES
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP
• Temperature Threshold: Programmable
• Full Temp Accuracy: 3 C
• Digital Output - Bus Interface: I2C, SMBus
• Digital Output - Number Of Bits: 10 bit
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 20 C
• Supply Current: 500 uA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.1.3
The MCP9805 has a 16-bit read/write Event output
Temperature Upper-Boundary Trip register (T
16-bit Lower-Boundary Trip register (T
16-bit Critical Boundary Trip register (T
contains 11-bit data in two’s compliment format
(0.25 °C/LSb). This data represents the maximum and
minimum temperature boundary or temperature
window that can be used to monitor ambient tempera-
ture. If this feature is enabled (Section 4.1.2 “Sensor
Configuration Register (CONFIG)”) and the ambient
temperature exceeds the specified boundary or
window, the MCP9805 asserts an Event output. (Refer
to Section 4.2.3 “Event Output Configuration”).
REGISTER 4-4:
© 2005 Microchip Technology Inc.
bit 15-13
bit 12
bit 11-2
bit 1-0
Upper-Half:
bit 15
Legend:
R = Readable bit
-n = Value at POR
Note: This table reflects the three 16-bit registers T
U-0
—
‘0000 0011’b and ‘0000 0100’b, respectively (see Register 4-1).
TEMPERATURE EVENT
UPPER/LOWER/CRITICAL
BOUNDARY TRIP REGISTERS
(T
UPPER
Unimplemented: Read as ‘0’
SIGN bit:
0
1
T
Temperature boundary trip data in two’s compliment format.
Unimplemented: Read as ‘0’
UPPER
= T
= T
Lower-Half:
bit 7
2
U-0
—
3
R/W-0
°C/LSb
A
A
/T
UPPER/LOWER/CRITICAL TEMPERATURE BOUNDARY TRIP REGISTERS
(T
/T
LOWER
0°C
0°C
UPPER
LOWER
/T
2
U-0
/T
/T
—
2
R/W-0
CRIT
CRIT
°C/LSb
LOWER
W = Writable bit
‘1’ = bit is set
)
bits:
LOWER
/T
R/W-0
SIGN
CRIT
CRIT
2
UPPER
1
R/W-0
) and a
°C/LSb
) that
)
), a
2
ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b
7
R/W-0
UPPER
°C/LSb 2
2
0
R/W-0
°C/LSb
, T
U = Unimplemented bit, read as ‘0’
‘0’ = bit is cleared
LOWER
6
R/W-0
°C/LSb 2
2
-1
R/W-0
and T
°C/LSb 2
CRIT
5
R/W-0
°C/LSb 2
-2
located at address ‘0000 0010’b,
R/W-0
°C/LSb
x = bit is unknown
4
R/W-0
°C/LSb
MCP9805
bit 8
U-0
—
DS21977B-page 13
U-0
—
bit 0