© 2011 Microchip Technology Inc. DS25095A-page 1
MCP9808
Features
•Accuracy:
- ±0.25 (typic al) 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
- 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 Inte rfac e: I
2
C™/SMBus Compatible
• Available Package s : 2x3 DFN-8, MSOP- 8
Typical Applications
• General Purpose
• In dus tri al Appl ic atio ns
• Industrial Freezers and Refrigerators
• Food Processing
• Personal Computers and Servers
• PC Peripherals
• Consumer Electronics
• Handheld/Portable Devices
Temperature Accuracy
Description
Microchip Technology Inc.’s MCP9808 digital
temperature sensor converts temperatures between
-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 thermost at operation, or as a
temperature Alert interrupt output for microprocessor-
based systems. The Alert output can also be configured
as a criti c al te mperature output onl y.
This sensor has an industry standard 400 kHz, 2-wire,
SMBus/I
2
C compatible serial interface, allowing up to
eight or sixteen sensors to be controlled with a single
serial bus (see Table 3-2 for available Add res s co des ).
These features make the MCP9808 ideal for
sophisticated, multi-zone, temperature-monitoring
applications.
Package Types
0%
10%
20%
30%
40%
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
Occurrences
Temperature Accuracy (°C)
T
A
= -20°C, 25°C, 85°C, 100°C
V
DD
= 3.3V
854 units
8-Pin 2x3 DFN*
1
2
3
4
8-Pin MSOP
8
7
6
5
* Includes Exposed Thermal Pad (EP); see Table 3-1.
A1
A0
A2
SCL
Alert
1
2
3
4
8
7
6
5
GND
SDA V
DD
EP
9
SCL
Alert
GND
SDA
A1
A0
A2
V
DD
±0.5°C Maximum Accuracy Digital Temperature Sensor
MCP9808
DS25095A-page 2 © 2011 Microchip Technology Inc.
Functional Block Diagram
Clear Alert
+0.5°C
+0.25°C
+0.125°C
+0.0625°C
Temperature
T
LOWER
Limit
Configuration
ΔΣ ADC
Band Gap
Temperature
Sensor
Alert Status
Output Contr ol
Critical Alert only
Alert Polarity
Alert Comp./Int.
T
CRITICAL
Limit
Register
Pointer
Critical Trip Lock
Alarm Window Lock
Shutdown
Hysteresis
Manuf actur er ID
Resolution
Device ID/Rev
SMBus/Standard I
2
C™
Interface
A0
A1
A2
Alert
SDA
SCL
V
DD
GND
T
UPPER
Limit