Texas Instruments LM95241CIMM/NOPB

Overview

LM95241CIMM/NOPB from Texas Instruments is a dual remote diode temperature sensor IC with SMBus 2.0 interface and TruTherm™ technology for precision thermal monitoring of Intel 65nm/90nm processors and discrete diode-connected transistors. It measures local die temperature plus two remote junctions with ±1.25°C accuracy (TA=20–40°C, TD=45–85°C), 0.03125°C resolution with digital filtering, and operates from 3.0 V to 3.6 V supply. It is used in laptop and server thermal management systems requiring high-accuracy, multi-zone sensing.

For engineers reviewing the LM95241CIMM/NOPB datasheet, LM95241CIMM/NOPB pinout, LM95241CIMM/NOPB application, or LM95241CIMM/NOPB equivalent, key selection considerations include remote diode non-ideality configuration (Intel 65nm/90nm vs. MMBT3904), programmable 11-/13-bit resolution, SMBus timing compliance (100 kHz max), local/remote conversion timing (≤88.9 ms), and VSSOP-8 package thermal resistance (210°C/W).

Technical Context

The LM95241CIMM/NOPB implements ΔV_BE-based remote temperature sensing using a sigma-delta ADC with analog filtering in the diode input stage and optional 13-bit digital filtering. Its TruTherm™ circuitry compensates for process-dependent non-ideality spread in Intel 65nm/90nm thermal diodes, enabling accurate measurement without external calibration.

It supports two independent remote diode channels (D1+/D1− and D2+/D2−), each configurable via register for Intel processor or MMBT3904 model selection and TruTherm mode enable/disable. Local temperature sensing uses an on-die sensor with fixed 9-bit+sign resolution (0.25°C LSB) and ±3.0°C accuracy over 0°C to +85°C.

Key Specifications

Pinout & Package

LM95241CIMM/NOPB is housed in an 8-pin Very Small Outline Package (VSSOP) with 0.5 mm pitch, optimized for thermal performance (θ_JA = 210°C/W) and space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual remote diode temperature sensing applications.

Compared with LM95241CIMM/NOPB, LM95235CIMM/NOPB reduces channel count but retains identical accuracy and SMBus behavior, while MAX6642AESA+ trades Intel-optimized precision for broader supply compatibility and simplified calibration.

Availability

LM95241CIMM/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, server processor monitoring, and workstation GPU control requiring stable component supply and long-term lifecycle support.

Supply support for LM95241CIMM/NOPB 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 leader specializing in analog, embedded processing, and connectivity technologies with decades of thermal sensing innovation.

The LM95241CIMM/NOPB belongs to TI's precision temperature sensor product line, designed specifically for high-accuracy multi-zone thermal monitoring in computing platforms with Intel 65nm/90nm processors.

FAQ

What is the remote temperature accuracy specification for LM95241CIMM/NOPB under typical operating conditions?

The LM95241CIMM/NOPB achieves ±1.25°C maximum remote diode temperature accuracy when ambient temperature is 20°C to 40°C and remote diode junction temperature is 45°C to 85°C. This specification applies specifically when using an Intel processor on 65nm or 90nm process with TruTherm™ mode enabled. The LM95241CIMM/NOPB maintains ±2.5°C accuracy across the full remote range of 25°C to 140°C at ambient 0°C to 85°C.

How does LM95241CIMM/NOPB support both Intel processors and discrete transistors as remote diodes?

The LM95241CIMM/NOPB includes a programmable Remote Diode Model Select register that configures internal bias and compensation for either Intel 65nm/90nm thermal diodes or MMBT3904-type discrete transistors. TruTherm™ mode is automatically enabled for Intel models and disabled for MMBT3904, ensuring optimal accuracy without external component changes. The LM95241CIMM/NOPB validates this selection at power-up with default settings for D1 (Intel) and D2 (MMBT3904).

What SMBus timing parameters must be observed when interfacing with LM95241CIMM/NOPB?

The LM95241CIMM/NOPB complies fully with SMBus 2.0 specifications: clock frequency 10–100 kHz, minimum tLOW/tHIGH of 4.7 µs/4.0 µs, rise/fall times ≤1 µs/0.3 µs, and TIMEOUT reset threshold of 25–35 ms. It does not support clock stretching. These parameters ensure reliable communication with standard platform controller hubs (PCH) and baseboard management controllers (BMC) without custom timing adjustments.

Can LM95241CIMM/NOPB measure temperatures above 127°C, and how is this achieved?

Yes, the LM95241CIMM/NOPB supports remote temperature measurements above 127°C by configuring its resolution mode to unsigned 11-bit (with filtering disabled) or unsigned 13-bit (with filtering enabled). In unsigned 13-bit mode, the LM95241CIMM/NOPB resolves temperatures up to +255.875°C with 0.03125°C LSB granularity. This capability is essential for monitoring high-power VRMs or GPUs where junction temperatures exceed conventional signed ranges.

What fault conditions does LM95241CIMM/NOPB detect on its remote diode inputs, and how are they reported?

The LM95241CIMM/NOPB detects D1+/D1− or D2+/D2− faults including shorts to GND/VDD, open circuits, or floating connections. When detected, it reports –128.000°C (signed) or +255.875°C (unsigned) in the corresponding remote temperature register and sets status bits RD1M (bit D1) or RD2M (bit D0) in the Status Register (02h). This enables firmware to distinguish between valid readings and hardware connection failures without additional external circuitry.