Document
MCP9844
±1°C Accurate, 1.8V Digital Temperature Sensor
Features
• 1MHz, 2-wire I2C™ Interface • 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 • Specified VDD Range: 1.7V to 3.6V • Operating Current: 100 µA (typical) • Available Package: 8-Pin TDFN
Temperature Sensor Features
• Temperature-to-Digital Converter (°C) • Sensor Accuracy (Grade B):
- ±0.2°C/±1°C (typ./max.) +75°C to +95°C - ±0.5°C/±2°C (typ./max.) +40°C to +125°C - ±1°C/±3°C (typ./max.) -40°C to +125°C
Typical Applications
• Temperature sensing for Solid State Drive (SSD) • General Purpose Temperature Datalog • General Purpose • Industrial Applications • Industrial Freezers and Refrigerators • Food Processing • Personal Computers and Servers • PC Peripherals • Consumer Electronics • Handheld/Portable Devices
Temperature Accuracy (°C)
3.0
VDD = 1.7 V to 3.6 V
2.0 16 units
Spec. Limits
1.0
0.0
-1.0 -2.0
+Std. Dev. Average
-Std. Dev.
-3.0
-40 -20 0 20 40 60 80 100 120 TA (°C)
Description
Microchip Technology Inc.’s MCP9844 digital temperature sensor converts temperature from -40°C to +125°C to a digital word. It provides an accuracy of ±0.2°C/±1°C (typical/maximum) from +75°C to +95°C with an operating voltage of 1.7V to 3.6V.
The MCP9844 digital temperature sensor comes with user programmable registers that provide flexibility for temperature sensing applications. The registers allow user selectable settings such as Shutdown or LowPower modes, and the specification of temperature event boundaries. When the temperature changes beyond the specified event boundary limits, the MCP9844 outputs an Alert signal at the Event pin. The user has the option of setting the temperature event output signal polarity as either an active-low or activehigh comparator output for the thermostat operation, or as a temperature event interrupt output for microprocessor-based systems.
This sensor has an industry standard I2C Fast Mode Plus compatible 1 MHz serial interface.
Package Types
8-Pin 2x3 TDFN *
A0 1
8 VDD
A1 2 EP 7 Event A2 3 9 6 SCL
GND 4
5 SDA
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2013 Microchip Technology Inc.
DS20005192A-page 1
MCP9844
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
VDD.................................................................................. 4.0V Voltage at all Input/Output pins ............... GND – 0.3V to 4.0V Pin A0....................................................... GND – 0.3V to 11V Storage temperature .....................................-65°C to +150°C Ambient temp. with power applied ................-40°C to +125°C Junction Temperature (TJ)........................................... +150°C ESD protection on all pins (HBM:MM) ................. (4 kV:200V) Latch-Up Current at each pin (25°C)........................ ±200 mA
†Notice: Str.