Description

STLM75

6/37

1

Description

The STLM75 is a high-precision digital CMOS temperature sensor IC with a sigma-delta

on page 7). It is targeted for general applications such as personal computers, system

thermal management, electronics equipment, and industrial controllers, and is packaged in

the industry standard 8-lead TSSOP and SO8 packages.

The device contains a band gap temperature sensor and 9-bit ADC which monitor and

digitize the temperature to a resolution up to 0.5°C. The STLM75 is typically accurate to

(±3°C - max) over the full temperature measurement range of –55°C to 125°C with ±2°C

accuracy in the –25°C to +100°C range. The STLM75 is pin-for-pin and software compatible

with the LM75B.

STLM75 is specified for operating at supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V,

the supply current is typically (125 µA).

The on-board sigma-delta analog-to-digital converter (ADC) converts the measured

temperature to a digital value that is calibrated in degrees centigrade; for Fahrenheit

applications a lookup table or conversion routine is required.

The STLM75 is factory-calibrated and requires no external components to measure

temperature.

1.1

Serial communications

user to access the data in the temperature register at any time. It communicates via the

serial interface with a master controller which operates at speeds up to 400 kHz. Three pins

(A0, A1, and A2) are available for address selection, and enable the user to connect up to 8

devices on the same bus without address conflict.

In addition, the serial interface gives the user easy access to all STLM75 registers to

customize operation of the device.