LM95221 Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus, I2C Interface | TI.com

LM95221 (ACTIVE)

Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus, I2C Interface

Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus, I2C Interface - LM95221
 

Description

The LM95221 is a dual remote diode temperature sensor in an 8-lead VSSOP package. The 2-wire serial interface of the LM95221 is compatible with SMBus 2.0. The LM95221 can sense three temperature zones, it can measure the temperature of its own die as well as two diode connected transistors. The diode connected transistors can be a thermal diode as found in Pentium and AMD processors or can simply be a diode connected MMBT3904 transistor. The LM95221 resolution format for remote temperature readings can be programmed to be 10-bits plus sign or 11-bits unsigned. In the unsigned mode the LM95221 remote diode readings can resolve temperatures above 127°C. Local temperature readings have a resolution of 9-bits plus sign.

The temperature of any ASIC can be accurately determined using the LM95221 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM95221 remote sensor accuracy of ±1°C is factory trimmed for a series resistance of 2.7 ohms and 1.008 non-ideality factor.

Features

  • Accurately Senses Die Temperature of Remote ICs or Diode Junctions
  • Remote Diode Fault Detection
  • On-board Local Temperature Sensing
  • Remote Temperature Readings
    • 0.125°C LSb
    • 10-bits Plus Sign or 11-bits Programmable Resolution
    • 11-bits Resolves Temperatures Above 127°C
  • Local Temperature Readings
    • 0.25°C
    • 9-bits Plus Sign
  • Status Register Support
  • Programmable Conversion Rate Allows User Optimization of Power Consumption
  • Shutdown Mode One-shot Conversion Control
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-pin VSSOP Package

Key Specifications

  • Local Temperature Accuracy
    • TA = 0°C to 85°C ± 3.0°C (max)
  • Remote Diode Temperature Accuracy
    • TA = 30°C to 50°C, TD = 45°C to 85°C
      ±1.0 °C (Max)
    • TA = 0°C to 85°C, TD = 25°C to 140°C
      ±3.0°C (Max)
  • Supply Voltage 3.0 V to 3.6 V
  • Supply Current 2 mA (Typ)

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Parametrics Compare all products in Digital Temperature Sensors

 
Device Type
Interface
Local Sensor Accuracy (Max) (+/- C)
Temp Resolution (Max) (bits)
Operating Temperature Range (C)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Max) (uA)
Features
Remote Channels (#)
Addresses
Rating
Package Group
Package Size: mm2:W x L (PKG)
LM95221
Remote    
I2C
SMBus    
3    
10    
0 to 85    
3    
3.6    
2600    
One shot conversion control
Programmable conversion rate
Remote diode fault detection
Shutdown    
2    
1    
Catalog    
VSSOP    
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)