LM64

LM64 www.ti.com SNAS207A – MAY 2004 – REVISED MARCH 2013 LM64 ±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's Check for Samples: LM64 FEATURES 1 2 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 WQFN Package APPLICATIONS Computer Processor Thermal Management Graphics Processor Thermal Management Voltage Regulator Modules Electronic Instrumentation Power Supplies Projectors KEY SPECIFICATIONS Remote Diode Temperature Accuracy (includes quantization error) – Ambient Temp – 30°C to 50°C – 0°C to 85°C – Diode Temp – 120°C to 140°C – 25°C to 140°C – Max Error – ±1.0°C (max) – ±3.0°C (max) Local Temp Accuracy (includes quantization error) – Ambient Temp 25°C to 125°C – Max Error ±3.0°C (max) Power Supply Requirements – Supply DC Voltage 3.0 V to 3.6 V – Supply DC Current 1.1 mA (typ) 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...