STMicroelectronics STTS75DS2F

Overview

STTS75DS2F from STMicroelectronics is a high-precision digital temperature sensor IC with integrated delta-sigma ADC, I²C/SMBus interface, and programmable thermal watchdog functionality. It measures from –55 °C to +125 °C with ±0.5 °C typical accuracy (±2 °C max in –25 °C to +100 °C), operates from 2.7 V to 5.5 V, draws 75 µA typical supply current, and supports user-configurable 9–12-bit resolution (0.5 °C to 0.0625 °C step). It is used in system thermal management for servers, industrial controllers, and power supply modules.

For engineers reviewing the STTS75DS2F datasheet, STTS75DS2F pinout, STTS75DS2F application, or STTS75DS2F equivalent, key selection considerations include its open-drain OS/INT alert output, 8-device I²C bus addressability via A0–A2 pins, shutdown/one-shot low-power modes, and factory-calibrated standalone thermostat operation without external components.

Technical Context

The STTS75DS2F integrates a bandgap-based temperature sensor and a 9–12-bit delta-sigma ADC with two's complement output format. Its digital core includes a configuration register controlling resolution (FT1/FT0), fault tolerance queue (FTI/FTO), polarity (POL), and one-shot mode (OSM).

It implements dual-mode thermal event signaling: comparator mode triggers OS/INT on consecutive over-limit readings (configurable fault tolerance), while interrupt mode asserts OS/INT on first threshold breach. The OS/INT pin serves as both interrupt flag and comparator output, requiring external pull-up.

Key Specifications

Pinout & Package

STTS75DS2F is available in SO8 (4.90 mm × 3.90 mm) and MSOP8/TSSOP8 (3.00 mm × 3.00 mm) packages - both RoHS-compliant, surface-mount, and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor and thermal watchdog applications.

Compared with LM75BIMM/NOPB and MAX31820MUA+, STTS75DS2F uniquely combines I²C address flexibility, hardware-configurable fault tolerance, and dual-mode OS/INT output - enabling both polled telemetry and deterministic hardware-level thermal shutdown in a single device.

Availability

STTS75DS2F is available at Aetrix Electronics and suitable for server thermal management, industrial PLC supervision, AC-DC power supply protection, and battery pack safety monitoring requiring stable component supply across extended product lifecycles.

Supply support for STTS75DS2F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and power devices for industrial, automotive, and consumer markets.

The STTS75DS2F belongs to ST's precision analog sensor portfolio, engineered specifically for embedded thermal management where autonomous, accurate, and low-power temperature awareness is critical - not merely data acquisition.

FAQ

What is the default I²C address of STTS75DS2F at power-up?

The STTS75DS2F defaults to I²C slave address 0x48 (1001000b) when all address pins A2–A0 are grounded. This base address shifts by +1 for each pin tied to VDD, supporting eight unique addresses from 0x48 to 0x4F. Address is latched at power-on reset and remains fixed until next POR.

Can STTS75DS2F operate without a microcontroller?

Yes - STTS75DS2F supports standalone thermostat operation. With TOS and THYS registers pre-programmed via initial I²C setup, it autonomously asserts the OS/INT pin when temperature exceeds thresholds, requiring no ongoing host interaction. Power-up defaults enable immediate use as a hardware thermal cutoff.

How does the fault tolerance feature prevent false alarms?

The fault tolerance logic uses a 2–4 sample queue (set by FT1/FT0 bits) that requires consecutive over-limit measurements before asserting OS/INT. For example, with FT=4, four successive conversions must exceed TOS before activation - rejecting single-cycle noise spikes common in motor drives or switch-mode power supplies.

Is an external pull-up resistor required on the OS/INT pin?

Yes - OS/INT is an open-drain output and must be pulled up to a valid logic rail (typically VDD or 3.3 V) with a 4.7 kΩ to 10 kΩ resistor. Without pull-up, the pin cannot drive high-impedance loads or interface with standard CMOS inputs, and alarm signaling will fail.