Description
Microchip Technology Inc.’s MCP9804 digital temperature sensor converts temperatures between -40°C and +125°C to a digital word with ±0.25°C/±1°C (typical/maximum) accuracy.
The MCP9804 comes with user-programmable registers that provide flexibility to 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 MCP9804 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.

FEATUREs
• Accuracy:
   - ±0.25°C (typical) from -40°C to +125°C
   - ±1°C (maximum) from -40°C to +125°C
   - +0.05°C (typical) lifetime drift
   - ±0.0625°C or ±1 LSb (typical) repeatability
• 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 Interface: I2C™/SMBus Compatible
• Available Packages: 2x3 DFN-8, MSOP-8

Typical Applications
• General Purpose
• Industrial Applications
• Industrial Freezers and Refrigerators
• Food Processing
• Personal Computers and Servers
• PC Peripherals
• Consumer Electronics
• Handheld/Portable Devices