MCP9805-BE/ST Microchip Technology, MCP9805-BE/ST Datasheet - Page 10

• Manufacturer Part Number: MCP9805-BE/ST
• Description: IC,TEMPERATURE SENSOR,TSSOP,8PIN,PLASTIC
• Manufacturer: Microchip Technology

Specifications of MCP9805-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: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP9805
4.1.1
This is a read-only register used to identify the temper-
ature sensor capability. In this case, the MCP9805 is
capable of providing temperature at 0.25°C resolution,
measuring temperature below and above 0°C,
providing ±1°C and ±2°C accuracy over the active and
monitor temperature ranges (respectively) and provid-
ing user-programmable temperature event boundary
trip limits. Register 4-2 describes the Capability
register. These functions are described in further detail
in the following sections.
REGISTER 4-2:
DS21977B-page 10
bit 15-5
bit 4-3
bit 2
bit 1
bit 0
Upper-Half:
bit 15
Legend:
R = Readable bit
- n = Value at POR
U-0
—
Unimplemented: Read as ‘0’
RESOLUTION bits:
00 =
01 =
10 =
11 =
TEMPERATURE MEASUREMENT RANGE (Meas. Range) bit:
0
1
ACCURACY bit:
0
1
BASIC CAPABILITY (Temp. Event) bit:
0
1
CAPABILITY REGISTER
= T
= The part can measure temperature below 0°C
= Accuracy
= Accuracy
= No defined function (This bit will never be cleared or set to ‘0’).
= The part has temperature boundary trip limits (T
event output (JC 42.4 required feature).
(Monitor Range)
(Monitor Range)
A
U-0
0.5 °C/LSb
0.25 °C/LSb (default resolution)
0.125 °C/LSb
0.0625 °C/LSb
—
Lower-Half:
bit 7
0x0000 (Hexadecimal) for temperature below 0°C
U-0
CAPABILITY REGISTER (READ-ONLY)
±2°C from +75°C to +95°C (Active Range) and ±3°C from +40°C to +125°C
±1°C from +75°C to +95°C (Active Range) and ±2°C from +40°C to +125°C
U-0
—
U-0
W = Writable bit
‘1’ = Bit is set
—
U-0
—
U-0
U-0
—
R-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
UPPER
Resolution
U-0
—
/T
LOWER
ADDRESS ‘0000 0000’b
R-1
/T
U-0
CRIT
—
Range
Meas.
registers) and a temperautre
R-1
© 2005 Microchip Technology Inc.
x = Bit is unknown
U-0
—
Accuracy
bit 8
R-1
Temp.
Event
R-1
bit 0