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LM95214CISD/NOPB

4 remote + 1 local temp sensor, ±1.1°C, SMBus, 11-bit, WSON-14

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Manufacturer Part：

LM95214CISD/NOPB

Package：

WSON-14 (4.0 × 4.0 × 0.8 mm, exposed pad)

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Description

Product Overview

The LM95214CISD/NOPB is a ±2°C quad remote diode and local temperature sensor from Texas Instruments, packaged in a 14-pin WSON (NHL) 4 × 4 mm package. It features four remote thermal diode inputs with ±1.1°C accuracy and one local temperature sensor with ±2.0°C accuracy, accessible via an SMBus 2.0 interface. The device supports programmable digital filters and analog front-end filtering for enhanced noise immunity in server and computing platforms.

Key Specifications

Function Quad Remote + Local Temperature Sensor
Remote Channels 4 (thermal diode inputs)
Local Sensor 1 (on-die)
Remote Accuracy ±1.1°C (max)
Local Accuracy ±2.0°C (max)
Resolution 11-bit (0.125°C), 0.03125°C with digital filter
Supply Voltage 3.0V to 3.6V
Interface SMBus 2.0
Features Programmable digital filters, TCRIT outputs, offset correction
Package WSON-14 (4.0 × 4.0 mm)
Operating Temperature -40°C to +140°C (remote), -40°C to +125°C (local)

Features

  • Four remote thermal diode inputs with industry-leading ±1.1°C accuracy
  • 11-bit resolution (0.125°C) with 0.03125°C using digital filter
  • Three programmable TCRIT outputs for critical temperature alerts
  • Programmable digital filters for noise rejection in server environments
  • Analog front-end filter for remote diode path noise immunity
  • Offset correction registers for sensor calibration

Applications

  • Server CPU and GPU multi-core temperature monitoring
  • Laptop and desktop thermal management systems
  • Network processor and ASIC junction temperature sensing
  • Data center rack environmental monitoring
  • Industrial motor drive thermal protection

The LM95214 is a high-precision multi-zone temperature sensor that monitors up to four remote thermal diodes and one local temperature zone. The remote channels achieve ±1.1°C maximum accuracy over the +25°C to +100°C range, making it suitable for critical thermal management in server and computing platforms. The device uses a switched-current measurement technique that biases the external thermal diode (typically integrated in Intel or AMD processors) at two current levels and measures the voltage difference to determine the junction temperature independent of diode process variations. The 11-bit ADC provides 0.125°C resolution, and the programmable digital filter can achieve 0.03125°C effective resolution with noise averaging.

The LM95214 measures remote temperature using the remote thermal diode technique. For each remote channel, the device alternately applies two bias currents (I1 and I2, where I2 ≈ 16 × I1) to the external diode-connected transistor and measures the resulting base-emitter voltages (VBE1 and VBE2). The temperature is calculated from the voltage difference: ΔVBE = VBE1 – VBE2 = (kT/q) × ln(I2/I1), where k is Boltzmann’s constant, q is the electron charge, and T is the absolute temperature. This ratio-metric measurement eliminates dependency on the transistor’s process parameters. The analog front-end filter removes high-frequency noise from the remote diode traces, while the programmable digital filter averages multiple conversions to achieve 0.03125°C effective resolution. The local temperature sensor uses an internal bandgap-based circuit. All results are accessible through the SMBus 2.0 interface.

Pin Name Type Function
1 D1+ Input Remote diode 1 positive (connect to CPU thermal diode)
2 D1- Input Remote diode 1 negative
3 D2+ Input Remote diode 2 positive
4 D2- Input Remote diode 2 negative
5 D3+ Input Remote diode 3 positive
6 D3- Input Remote diode 3 negative
7 D4+ Input Remote diode 4 positive
8 D4- Input Remote diode 4 negative
9 GND Power Ground
10 SMBDATA I/O SMBus data (open-drain)
11 SMBCLK Input SMBus clock
12 VDD Power 3.3V supply
13 TCRIT1 Output Critical temperature output 1
14 TCRIT2/ADDR I/O Critical temp output 2 / address select
EP Thermal Pad Power Exposed pad — connect to GND
  • Server platform quad-CPU core temperature monitoring with ±1.1°C accuracy
  • Laptop multi-zone thermal management: CPU, GPU, chipset, and battery
  • Network router ASIC junction temperature monitoring with TCRIT alerts
  • Data center blade server environmental monitoring with high resolution
  • Industrial motor drive IGBT junction temperature sensing
Manufacturer Part Number Package Notes
TI LM96000CIMT/NOPB TSSOP-24 HW monitor + fan control, 2 remote diodes
Maxim MAX6697 TQFN-24 7-channel remote temp sensor
ADI ADT7481 QSOP-16 3 remote + 1 local temp sensor
NXP SA56004ED TSSOP-24 Dual remote + local temp sensor
Microchip EMC1503 QFN-16 Dual remote temp sensor
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

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Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

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Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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