Microchip Technology introduced their MCP9808 silicon temperature sensor. The digital temperature sensor converts temperatures between -20°C and +100°C to a digital word with ±0.5°C accuracy. The chip features high temperature resolution of 12 bits (0.0625 degrees Celsius/LSB), shutdown, under/over-temperature monitor and critical-temperature alert. The Microchip MCP9808 is available now in 8-pin MSOP and 2×3 mm DFN packages. Prices start at $0.84 each (5,000-unit quantities). The IC is ideal for thermostats, personal computers and industrial/automotive applications.
The MCP9808 comes with user-programmable registers for temperature sensing applications. The registers enable user-selectable settings such as shutdown or low-power modes and the specification of temperature Event and Critical output boundaries. When the temperature changes beyond the specified boundary limits, the MCP9808 outputs an event signal.
The user has the option of setting the event output signal polarity as an active-low or active-high comparator output for thermostat operation, or as temperature event interrupt output for microprocessor-based systems. The event output can also be configured as a critical temperature output. The sensor has an industry standard 2-wire, SMBus and Standard I2C compatible (100kHz/400kHz bus clock) serial interface. It can support up to eight sensors to be controlled in a single serial bus.
Microchip MCP9808 Silicon Temp Sensor Features
- Accuracy of ±0.25°C (typical) from -40°C to +125°C
- ±0.5°C (maximum) accuracy from -20°C to +100°C
- User selectable measurement resolution of – 0.5°C, 0.25°C, 0.125°C, 0.0625°C
- User programmable temperature limits: temperature window limit and critical temperature limit
- User programmable temperature alert output
- 2.7V to 5.5V operating voltage range
- Operating current: 200 µA (typical)
- Shutdown current: 0.1 µA (typical)
- 2-wire interface: I2C/SMBus compatible
- Available packages: 2×3 DFN-8 and MSOP-8
More info: Microchip Technology