Description

The 9TCS1085 is a highly programmable IC that integrates

clock synthesizers with a PWM Fan controller and

temperature sensor 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 of

life powered by a CR2032 coin cell battery. The 9TCS1085

can output computer system clock frequencies of 24, 25, 27

and 48 MHz which reduces 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 follows a detected fault condition.

The 9TCS1085 includes temperature monitor function that

measures an external diode. The temperature sensor is

optimized to be accurate within ±1°C between 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 the temperature sensor. The hardware limits drive

dedicated ALERT and THERM pins for system shutdown.

The 9TCS1085 is available in a 32-pin QFN package and is

available for commercial temperature range.

Applications

• Notebook Computers

• Netbook Computers

• Smartbook Computers

• Consumer Portable Devices

• Embedded Systems

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

• Network Area Storage