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LM64  Product Folder

±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's
Generic P/N 64
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing

Datasheet

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LM64 ±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's 376 Kbytes 3-Dec-03 View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM64EVALevaluation boardFull production N/AN/A   N/A-
6 weeks0

General Description

The LM64 is a remote diode temperature sensor with PWM fan control. The LM64 accurately measures its own temperature and that of a remote diode. The LM64 remote temperature accuracy is factory trimmed for a MMBT3904 diode-connected transistor with a 16°C offset for high temperatures.

The LM64 features a PWM, open-drain, fan control output, 5 GPIO (General Purpose Input/Output) and 5 GPD (General Purpose Default) pins. The 8-step Lookup Table allows for a non-linear fan speed vs. temperature transfer function often used to quiet acoustic fan noise.

Features

  • Accurately senses remote and local diode temperatures
  • Integrated PWM fan speed control output
  • Programmable 8-step Lookup Table for quieting fans
  • ALERT# and T_Crit# open-drain outputs
  • Tachometer input for measuring fan RPM
  • 10 bit plus sign remote diode temperature data format, with 0.125°C resolution
  • SMBus 2.0 compatible interface, supports TIMEOUT
  • 5 General Purpose Input/Output pins
  • 5 General Purpose Default input pins
  • 24-pin LLP package

Key Specification

  • Remote Diode Temperature Accuracy (includes quantization error)
Ambient TempDiode TempMax Error
30°C to 50°C 120°C to 140°C±1.0°C (max)
0°C to 85°C25°C to 140°C±3.0°C (max)
  • Local Temp Accuracy (includes quantization error)
Ambient TempMax Error
25°C to 125°C±3.0°C (max)
  • Power Supply Requirements
Supply DC Voltage3.0 V to 3.6 V
Supply DC Current1.1 mA (typ)

Applications

  • Computer Processor Thermal Management
  • Graphics Processor Thermal Management
  • Voltage Regulator Modules
  • Electronic Instrumentation
  • Power Supplies
  • Projectors
[Information as of 15-Jan-2004]

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