STMicroelectronics STTS75M2E

Overview

STTS75M2E 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 PCs, industrial controllers, and power modules.

For engineers reviewing the STTS75M2E datasheet, STTS75M2E pinout, STTS75M2E application, or STTS75M2E equivalent, key selection considerations include its open-drain OS/INT alert output, 8-device I²C bus addressability via A0–A2 pins, 45 ms typical 9-bit conversion time, shutdown + one-shot low-power modes, and factory-calibrated operation without external components.

Technical Context

The STTS75M2E integrates a bandgap-based temperature sensing element with a 9–12-bit delta-sigma ADC, delivering calibrated two's complement digital output directly in °C. Its I²C-compatible 2-wire interface supports up to 400 kHz clock rate and uses three address pins (A0–A2) to configure one of eight unique slave addresses.

It implements dual-mode thermal monitoring: comparator mode triggers OS/INT when temperature exceeds TOS register value for a fault-tolerant count (configurable via FT bits), while interrupt mode asserts OS/INT on each threshold breach. The OS/INT pin is open-drain, polarity-programmable, and functions as either thermostat alert or system interrupt signal.

Key Specifications

Pinout & Package

STTS75M2E 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, 8-pin plastic packages with standard footprint compatibility.

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, STTS75M2E adds hysteresis programming and fault-tolerant alarm logic for robust hardware thermal shutdown; compared with MAX31826ATP+, it offers faster I²C communication, lower quiescent current, and simpler power architecture - making it optimal for tightly controlled, high-reliability thermal management.

Availability

STTS75M2E is available at Aetrix Electronics and suitable for server thermal management, industrial PLC protection, power supply module sensing, and battery pack safety monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STTS75M2E 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 solutions for industrial, automotive, and consumer markets.

STTS75M2E belongs to ST's precision analog sensor product line, engineered specifically for embedded thermal monitoring and autonomous thermal protection in space-constrained, reliability-critical systems.

FAQ

What is the default I²C address of STTS75M2E at power-up?

The STTS75M2E defaults to I²C slave address 0x48 (1001000b) when all address pins A2–A0 are grounded. This base address shifts by +1 for each address pin pulled high, enabling eight unique addresses (0x48–0x4F) on the same bus without software reconfiguration.

Can STTS75M2E operate without a microcontroller?

Yes - STTS75M2E supports standalone thermostat operation. With TOS and THYS registers preconfigured, it autonomously asserts the OS/INT pin on overtemperature events using comparator mode, requiring no host intervention for basic thermal cutoff functionality.

How does the fault tolerance feature prevent false alarms?

The fault tolerance setting (FT1/FT0 bits) configures a counter that requires 1–4 consecutive temperature readings above TOS before asserting OS/INT. This eliminates spurious triggers caused by electrical noise or short thermal transients, ensuring reliable hardware-level thermal protection.

Is an external bypass capacitor required for STTS75M2E?

A 0.1 µF ceramic bypass capacitor between VDD and GND is recommended per the datasheet to suppress high-frequency supply noise, which improves ADC stability and measurement repeatability - especially critical in electrically noisy industrial or power-conversion environments.