The MCP9801 is a digital temperature sensor capable of reading temperatures from -55°C to +125°C. Temperature data is measured from an integrated temperature sensor and converted to digital word with a user selectable 9 to 12-bit Sigma Delta Analog to Digital Converter.The MCP9801 notifies the host controller when the ambient temperature exceeds a user programmed set point. The ALERT output is programmable as either a simple comparator for thermostat operation or as a temperature event interrupt. Communication with the sensor is accomplished via a two-wire bus that is compatible with industry standard protocols. This permits reading the current temperature, programming the set point and hysteresis and configuring the device. Address selection inputs allow up to eight MCP9801 sensors to share the same 2-wire bus for multizone monitoring.Small physical size, low installed cost and ease of usemake the MCP9801 an ideal choice for implementingsophisticated temperature system management schemes in a variety of applications.

  2-wire I²C™/SMBus Compatible Interface

  User Selectable 9- to 12-Bit Resolution

  ±1°C Accuracy from -10°C to +85°C

  ±2°C Accuracy from +85°C to +125°C

  Low Operating Current: 220 µA (typical)

  Shutdown Mode: 1 µA (max)

  Power Saving One-Shot Temperature Conversion Measurement

  Space Saving MSOP and SOIC Packages

  AEC-Q100 Qualified Grade 1