MCP9808
±0.5°C Maximum Accuracy Digital Temperature Sensor
Features
Description
• Accuracy:
Microchip Technology Inc.’s MCP9808 digital
temperature sensor converts temperatures between
- ±0.25 (typical) from -40°C to +125°C
- ±0.5°C (maximum) from -20°C to 100°C
- ±1°C (maximum) from -40°C to +125°C
• User-Selectable Measurement Resolution:
- +0.5°C, +0.25°C, +0.125°C, +0.0625°C
• User-Programmable Temperature Limits:
- Temperature Window Limit
-20°C and +100°C to
a
digital word with
±0.25°C/±0.5°C (typical/maximum) accuracy.
The MCP9808 comes with user-programmable registers
that provide flexibility for temperature sensing
applications. The registers allow user-selectable
settings such as Shutdown or Low-Power modes and
the specification of temperature Alert window limits and
critical output limits. When the temperature changes
beyond the specified boundary limits, the MCP9808
outputs an Alert signal. The user has the option of setting
the Alert output signal polarity as an active-low or active-
high comparator output for thermostat operation, or as a
temperature Alert interrupt output for microprocessor-
based systems. The Alert output can also be configured
as a critical temperature output only.
- Critical Temperature Limit
• User-Programmable Temperature Alert Output
• Operating Voltage Range: 2.7V to 5.5V
• Operating Current: 200 µA (typical)
• Shutdown Current: 0.1 µA (typical)
• 2-wire Interface: I2C™/SMBus Compatible
• Available Packages: 2x3 DFN-8, MSOP-8
This sensor has an industry standard 400 kHz, 2-wire,
SMBus/I2C compatible serial interface, allowing up to
eight or sixteen sensors to be controlled with a single
serial bus (see Table 3-2 for available Address codes).
These features make the MCP9808 ideal for
sophisticated, multi-zone, temperature-monitoring
applications.
Typical Applications
• General Purpose
• Industrial Applications
• Industrial Freezers and Refrigerators
• Food Processing
• Personal Computers and Servers
• PC Peripherals
Package Types
• Consumer Electronics
• Handheld/Portable Devices
8-Pin 2x3 DFN*
8-Pin MSOP
V
SDA 1
8
7
6
5
SDA
SCL
V
DD
1
2
8
7
DD
2
3
4
A0
Temperature Accuracy
SCL
A0
EP
9
A1
A2
Alert
GND
Alert
GND
A1
A2
3
4
6
5
40%
TA = -20°C, 25°C, 85°C, 100°C
VDD = 3.3V
854 units
30%
* Includes Exposed Thermal Pad (EP); see Table 3-1.
20%
10%
0%
Temperature Accuracy (°C)
© 2011 Microchip Technology Inc.
DS25095A-page 1
MICROCHIP [ MICROCHIP ]
