Microchip's TCN75A is a digital temperature sensor capable of reading temperatures from -40°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 ΣΔ analog-to-digital converter. The TCN75A notifies the host controller when the ambient temperature exceeds a user-programmed set point. The ALERT output is programmable either as 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. Small physical size, low installed cost, and ease of use make the TCN75A an ideal choice for implementing sophisticated temperature system management schemes in a variety of applications.