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| IDT 9TCS1083温度和风扇控制解决方案 | |||||
作者：IDT 文章来源：IDT 点击数： 更新时间：2011-10-26  |
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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应用: • Notebook Computers • Netbook Computers • Smartbook Computers • Consumer Portable Devices • Embedded Systems • Networking Equipment (i.e. Routers, Switches) • Network Area Storage  图1. 9TCS1083方框图  图2. 9TCS1083用于VBAT和DD_RTC的参考电路图  图3. 9TCS1083风扇控制系统框图  图4. 9TCS1083参考设计电路图 详情请见: http://www.idt.com/?genId=9TCS1083&cid=18742291# |
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