LM75B Datasheet -Temperature Sensor and thermal Watchdog

Part Number: LM75B

Function: Digital Temperature Sensor and thermal Watchdog

Package: SO, TSSOP, XSON 8 Type

Manufacturer: NXP Semiconductors.


LM75B datasheet



The LM75B is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma-Delta A-to-D conversion technique with an overtemperature detection output. The LM75B contains a number of data registers: Configuration register (Conf) to store the device settings such as device operation mode, OS operation mode, OS polarity and OS fault queue as described in Section 7 “Functional description”; temperature register (Temp) to store the digital temp reading, and set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, that can be communicated by a controller via the 2-wire serial I2C-bus interface.

The device also includes an open-drain output (OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins so that eight devices
can be connected on the same bus without address conflict.

The LM75B can be configured for different operation conditions. It can be set in normal mode to periodically monitor the ambient temperature, or in shutdown mode to minimize power consumption. The OS output operates in either of two selectable modes: OS comparator mode or OS interrupt mode. Its active state can be selected as either HIGH or LOW. The fault queue that defines the number of consecutive faults in order to activate the OS output is programmable as well as the set-point limits.


1. I2C-bus interface with up to 8 devices on the same bus

2. Power supply range from 2.8 V to 5.5 V

3. Temperatures range from -55 °C to +125 °C

4. 11-bit ADC that offers a temperature resolution of 0.125 °C

5. Programmable temperature threshold and hysteresis set points

6. Supply current of 1.0A in shutdown mode for power conservation

7. Stand-alone operation as thermostat at power-up


1. System thermal management

2. Personal computers

3. Electronics equipment

4. Industrial controllers

Other data sheets are available within the file: LM75BD, LM75BDP, LM75BGD, LM75BTP

LM75B Datasheet PDF Download

LM75B pdf