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LM95221

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±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C

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Data sheet

LM95221

ACTIVE
Data sheet Order now

Product details

Local sensor accuracy (max) 3 Type Remote Operating temperature range (°C) 0 to 85 Supply voltage (min) (V) 3 Interface type I2C, SMBus Supply voltage (max) (V) 3.6 Features ALERT, One-shot conversion Supply current (max) (µA) 2600 Temp resolution (max) (bps) 10 Remote channels (#) 2 Addresses 1 Rating Catalog
Local sensor accuracy (max) 3 Type Remote Operating temperature range (°C) 0 to 85 Supply voltage (min) (V) 3 Interface type I2C, SMBus Supply voltage (max) (V) 3.6 Features ALERT, One-shot conversion Supply current (max) (µA) 2600 Temp resolution (max) (bps) 10 Remote channels (#) 2 Addresses 1 Rating Catalog
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • 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)

All trademarks are the property of their respective owners.

  • 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)

All trademarks are the property of their respective owners.

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.

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.
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* Data sheet LM95221 Dual Remote Diode Digital Temperature Sensor with SMBus Interface datasheet (Rev. B) 22 Mar 2013

Design & development

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Support software

DIGITALTEMPSENSORSEVM-SW — Eval Board Software for Hardware Monitors and Digital Temp Sensors

Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
  • LM63 — 1 remote and local temperature sensor with fan control
  • LM64 — 1 remote and local temp sensor with fan control and 5 GPIO's
  • LM71 — ±1.5°C Temperature Sensor with SPI Interface
  • LM71-Q1 — Automotive Grade, ±1.5°C Temperature Sensor with SPI Interface
  • LM73 — ±1°C Temperature Sensor with I2C/SMBus Interface
  • LM86 — ±0.75°C remote and local temperature sensor with SMBus interface
  • LM89 — ±0.75°C remote and local temperature sensor with SMBus interface and 2 addresses for bus sharing
  • LM90 — Remote and Local Temperature Sensor with SMBus Interface
  • LM93 — 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors
  • LM95010 — ±2°C Temperature Sensor with SensorPath Interface
  • LM95071 — ±1°C Temperature Sensor with SPI Interface
  • LM95221 — ±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C
  • LM95231 — Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95235 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 65/90n
  • LM95235-Q1 — Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus
  • LM96000 — Hardware monitor with fan control and 6 power supply voltage monitors
  • LM96080 — 1 local temp sensor with fan speed and power supply voltage monitor
  • LM96163 — 1 remote and local temp sensor with beta compensation and fan control
  • LM99 — Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
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Support software

SENSOREVAL — Eval Board Software For Hardware Monitors And Digital Temperature Sensors

SensorEval
SensorEval software supports the latest TI temperature sensor and hardware monitor evaluation boards via USB interface. It also allows access to sensors mounted directly on motherboards that support Intel chip sets.

  • Download SensorEval Software and Manual
  • Windows XP support is offered for (...)
Supported products & hardware

Supported products & hardware

Products
Digital temperature sensors
  • LM63 — 1 remote and local temperature sensor with fan control
  • LM64 — 1 remote and local temp sensor with fan control and 5 GPIO's
  • LM71 — ±1.5°C Temperature Sensor with SPI Interface
  • LM71-Q1 — Automotive Grade, ±1.5°C Temperature Sensor with SPI Interface
  • LM73 — ±1°C Temperature Sensor with I2C/SMBus Interface
  • LM75A — 2C industry standard temperature sensor, I2C/SMBus interface
  • LM86 — ±0.75°C remote and local temperature sensor with SMBus interface
  • LM89 — ±0.75°C remote and local temperature sensor with SMBus interface and 2 addresses for bus sharing
  • LM90 — Remote and Local Temperature Sensor with SMBus Interface
  • LM93 — 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors
  • LM95010 — ±2°C Temperature Sensor with SensorPath Interface
  • LM95071 — ±1°C Temperature Sensor with SPI Interface
  • LM95172-Q1 — Automotive Grade, ±1°C Temperature Sensor with 200°C Capability and SPI Interface
  • LM95214 — ±2°C Quad Remote and Local Temperature Sensor with SMBus Interface
  • LM95221 — ±3°C dual remote & local temperature sensor with beta compensation and SMBus, I2C
  • LM95231 — Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95233 — ±2°C Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95234 — ±2°C Quad Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
  • LM95235 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 65/90n
  • LM95235-Q1 — Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus
  • LM95241 — ±1.25°C dual remote & local temperature sensor with beta compensation and SMBus, I
  • LM95245 — ±0.75°C remote & local temperature sensor with SMBus, beta compensation for 45nm d
  • LM96000 — Hardware monitor with fan control and 6 power supply voltage monitors
  • LM96080 — 1 local temp sensor with fan speed and power supply voltage monitor
  • LM96163 — 1 remote and local temp sensor with beta compensation and fan control
  • LM99 — Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface
Precision ADCs
  • ADC128D818 — 12-Bit, 82SPS, 8-Ch Delta-Sigma ADC with Temp Sensor, INT / EXT Voltage Reference & I2C Interface
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