|
IDT公司的9TCS1083是業界首個集成了時序,多個溫度傳感器和PWM風扇控制的解決方案.溫度測量在60-100度C時的精度為±1℃ ,在0-100度C時的精度為 ±2℃, 風扇控制采用高頻或低頻PWM輸出,系統的PLL可產生超低頻32.768 kHz輸出,主要用在筆記本電腦,上網本,手持消費類電子,嵌入系統,網絡設備如路由器,交換器以及網絡局部存儲.本文介紹了9TCS1083主要特性, 方框圖,典型應用電路和參考設計電路. The 9TCS1083 is a highly programmable IC that integrates clock synthesizers with a PWM Fan controller and multiple temperature sensors for hardware thermal protection. The device has an ultra-low-power 32.768 kHz frequency generator to support Real Time Clocks (RTC). This device can generate the 32.768 kHz frequency up to four years powered by a CR2032 battery. The 9TCS1083 can output computer system clock frequencies of 24, 25, 27, and 48 MHz which will reduce the component count on the circuit board. The fan controller is pulsed width modulated (PWM) used for the temperature proportional speed control. The device is highly configurable through I2C for ease and flexibility of use. The fan controller has three different modes of operation and will work with multiple pole, brushless DC fans. An integrated Start-up Timer ensures reliable motor start-up and turn-on, or following a detected fault condition. The 9TCS1083 includes a temperature monitor that measures two diodes. The temperature sensor is optimized to be accurate within ±1°C within the temperature range of 60°C to 100°C. This device is highly programmable through the use of I2C to set high and low limits for all the temperature channels as well as set critical limits. The hardware limits drive dedicated fault and alert pins for system shutdown. The 9TCS1083 is available in a 32-pin QFN package and is available for commercial temperature range. 9TCS1083主要特性: Thermal Sensor • Two temperature sensor channels • Both H/W & S/W programmable over/under temperature alarms • No Calibration required in application • Diode failure detection • Support SMBUS Alert • Accuracy: ±1℃ (+60℃ to +100℃); ±2℃ (0℃ to+100℃) • Offset register for system calibration • Series resistor cancellation feature Fan Controller • High Frequency or Low Frequency PWM Outputs for Use with 4-Wire Fans • TACH Inputs to Measure Fan Speed • OS Independent Automatic Fan Speed Control Based on Thermal Information • Dynamic TMIN Control Mode to Optimize System Acoustics • Default Startup at 100% PWM for All Fans for Robust Operation System Clock PLL Synthesizers • Scalable Low Voltage VDD I/O (1.5V to 1.05V) to reduce power consumption (apply to 25MHz output) • Integrated series termination resistors • Selectable – Single-ended 24MHz/27MHz/48MHz clock output @ VDD3.3V • 3 – single ended 25MHz clock outputs (buffer out) • 32.768 kHz outputs with < 1.8μA power consumption for system RTC circuit 9TCS1083應用: • Notebook Computers • Netbook Computers • Smartbook Computers • Consumer Portable Devices • Embedded Systems • Networking Equipment (i.e. Routers, Switches) • Network Area Storage 
圖1. 9TCS1083方框圖
圖2. 9TCS1083用于VBAT和DD_RTC的參考電路圖
圖3. 9TCS1083風扇控制系統框圖
圖4. 9TCS1083參考設計電路圖 詳情請見: http://www.idt.com/?genId=9TCS1083&cid=18742291# |
