Texas Instruments LM92CIM

Overview

LM92CIM from Texas Instruments is a ±0.33°C accurate, 12-bit + sign digital temperature sensor with integrated thermal window comparator and two-wire (I²C) interface. It delivers precision temperature measurement across −25°C to +150°C, features dual open-drain outputs (INT and T_CRIT_A), operates from 2.7V to 5.5V, and supports up to four devices on a single bus - used in system thermal management for PCs, servers, and industrial controllers.

For engineers reviewing the LM92CIM datasheet, LM92CIM pinout, LM92CIM application, or LM92CIM equivalent, this page provides verified technical context, confirmed pin functions, real-world thermal monitoring use cases, validated alternative parts, and supply support details specific to the LM92CIM SOIC-8 variant.

Technical Context

The LM92CIM integrates a band-gap temperature sensor, 13-bit ADC (12-bit + sign output), and fully programmable digital comparator logic with independent upper (THIGH), lower (TLOW), and critical (T_CRIT) thresholds. Its dual open-drain outputs operate in configurable comparator or event modes, with programmable hysteresis (THYST) and a 4-fault queue to suppress noise-induced false triggers.

It implements a standard I²C slave interface with fixed 5-bit address prefix "10010" and user-selectable LSBs via A0/A1 pins, enabling up to four unique addresses on one bus. The device powers up with default thresholds (TLOW = 10°C, THIGH = 64°C, T_CRIT = 80°C, THYST = 2°C) and supports shutdown mode (5 µA typical) while retaining register accessibility.

Key Specifications

Pinout & Package

LM92CIM is packaged in an 8-pin SOIC (Package Number D, R-PDSO-G8) with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75BIMM/NOPB and MAX31820MUA+, the LM92CIM uniquely combines ±0.33°C accuracy, dual independent open-drain outputs, programmable hysteresis, and 4-fault queue filtering - making it the only option among the three qualified for ACPI-compliant thermal management and hardware-initiated shutdown in mission-critical systems.

Availability

LM92CIM is available at Aetrix Electronics and suitable for server thermal monitoring, industrial motor drive protection, medical imaging power supplies, and automotive infotainment SoC applications requiring stable component supply and long-term lifecycle continuity.

Supply support for LM92CIM 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and silicon innovation for industrial, automotive, and communications markets.

The LM92CIM belongs to TI's precision analog temperature sensor product line, designed specifically for high-accuracy, self-contained thermal monitoring with integrated window comparison and hardware alarm outputs in space-constrained systems.

FAQ

What is the maximum operating temperature range supported by the LM92CIM?

The LM92CIM is rated for operation from −55°C to +150°C. Its temperature accuracy specification is guaranteed across −25°C to +150°C (±1.5°C max), with best-in-class ±0.33°C max accuracy at +30°C. While full-scale range exceeds 128°C, TI recommends avoiding prolonged operation above +125°C to ensure long-term reliability and accuracy stability. The LM92CIM's SOIC-8 package supports this extended range via optimized thermal resistance (θJA = 200°C/W on 2 oz copper).

How does the LM92CIM's dual-output architecture (INT and T_CRIT_A) improve system safety?

LM92CIM's dual-output architecture separates window violation alerts (INT) from critical thermal shutdown signaling (T_CRIT_A). This enables independent routing: INT feeds software-controlled thermal management (e.g., CPU throttling), while T_CRIT_A directly drives hardware-level power cutoff circuits - ensuring fail-safe response even if the host processor locks up. Both outputs are open-drain, allowing wire-ORing or diode-ORing for layered fault handling without additional logic.

Can the LM92CIM be used in I²C bus systems with multiple sensors?

Yes. The LM92CIM supports up to four devices on a single I²C bus using its A0 and A1 address-select pins, which configure the two LSBs of its 7-bit slave address (fixed prefix "10010"). Each combination (00, 01, 10, 11) yields a unique address, eliminating bus contention. The LM92CIM also features robust noise immunity via its 4-fault queue, making it suitable for electrically noisy multi-sensor deployments in industrial or automotive ECUs.

What is the resolution and data format of temperature readings from the LM92CIM?

The LM92CIM provides 13-bit two's complement temperature data with 0.0625°C per LSB resolution. Temperature values are read from the 16-bit Temperature Register (D15–D0), where D3–D15 contain the signed magnitude and D0–D2 hold status bits (CRIT, HIGH, LOW). For example, +25°C maps to 0x0190 (0000 0001 1001 0000 binary), and −25°C maps to 0x1E70 (1111 0011 1000 0000 binary), enabling direct interpretation without floating-point math.

Does the LM92CIM support low-power operation, and how is it configured?

Yes. The LM92CIM supports a dedicated shutdown mode that reduces quiescent current to 5 µA typical. This mode is enabled by writing '1' to bit D0 (Shutdown) in the Configuration Register via I²C. In shutdown, conversions halt, INT and T_CRIT_A outputs reset, but the I²C interface remains active - allowing register reads/writes and immediate wake-up. The device resumes normal operation within milliseconds after clearing the shutdown bit, supporting duty-cycled thermal monitoring in battery-powered equipment.