器件名称:
TC655EUN
功能描述:
Dual SMBus
文件大小:
706.72KB 共36页
简 介:
M Features Temperature Proportional Fan Speed for Reduced Acoustic Noise and Longer Fan Life FanSense Protects against Fan Failure and Eliminates the Need for 3-wire Fans Over Temperature Detection (TC655) Efficient PWM Fan Drive Provides RPM Data 2-Wire SMBus-Compatible Interface Supports Any Fan Voltage Software Controlled Shutdown Mode for "Green" Systems Supports Low Cost NTC/PTC Thermistors Space Saving 10-Pin MSOP Package Temperature Range: -40°C to +85C TC654/TC655 Description The TC654 and TC655 are PWM mode fan speed controllers with FanSense technology for use with brushless DC fans. These devices implement temperature proportional fan speed control which lowers acoustic fan noise and increases fan life. The voltage at VIN (Pin 1) represents temperature and is typically provided by an external thermistor or voltage output temperature sensor. The PWM output (VOUT) is adjusted between 30% and 100%, based on the voltage at VIN. The PWM duty cycle can also be programmed via SMBus to allow fan speed control without the need for an external thermistor. If VIN is not connected, the TC654/TC655 will start driving the fan at a default duty cycle of 39.33%. See Section 4.3, "Fan Startup", for more details. In normal fan operation, pulse trains are present at SENSE1 (Pin 8) and SENSE2 (Pin 7). The TC654/ TC655 use these pulses to calculate the fan revolutions per minute (RPM). The fan RPM data is used to detect a worn out, stalled, open or unconnected fan. An RPM l……
