LM75DM-33R2

The LM75DM-33R2 is a serially programmable temperature sensor that notifies the host controller when ambient temperature exceeds a userprogrammed setpoint. Hysteresis is also programmable. The INT/CMPTR output is programmable as either a simple comparator for thermostat operation or as a temperature event interrupt. Communication with the LM75 is accomplished via a twowire bus that is compatible with industry standard protocols. This permits reading the current temperature, programming the setpoint and hysteresis, and configuring the device.

The LM75DM-33R2 powers up in Comparator Mode with a default setpoint of 80°C with 5°C hysteresis. Defaults allow independent operation as a standalone thermostat. A shutdown command may be sent via the 2wire bus to activate the lowpower standby mode. Address selection inputs allow up to eight LM75's to share the same 2wire bus for multizone monitoring.

All registers can be read by the host and the INT/CMPTR output's polarity is user programmable. Both polled and interrupt driven systems are easily accommodated. Small physical size, low installed cost, and ease of use make the LM75 an ideal choice for implementing sophisticated system management schemes.