IDT 9TCS1083温度和风扇控制解决方案

关键词： 9TCS1083 , IDT , 风扇 , 温度

IDT公司的9TCS1083是业界首个集成了时序,多个温度传感器和PWM风扇控制的解决方案.温度测量在60-100度C时的精度为±1℃ ,在0-100度C时的精度为 ±2℃, 风扇控制采用高频或低频PWM输出,系统的PLL可产生超低频32.768 kHz输出,主要用在笔记本电脑,上网本,手持消费类电子,嵌入系统,网络设备如路由器,交换器以及网络局部存储.本文介绍了9TCS1083主要特性, 方框图,典型应用电路和参考设计电路.

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应用:

• Notebook Computers

• Netbook Computers

• Smartbook Computers

• Consumer Portable Devices

• Embedded Systems

• Networking Equipment (i.e. Routers, Switches)

• Network Area Storage

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图1. 9TCS1083方框图

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图2. 9TCS1083用于VBAT和DD_RTC的参考电路图

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