2007

V0.28P

-1-

F75133

1. General Description

The F75133S is a “Loading Gauge IC”. Loading detection and current monitor are the major applications

of the F75133S. The F75133S is following the PWM signal change of duty cycle to react related functions for

user application. For instance, the F75133S can be used to sense CPU loading for FAN speed control to cool

down the temperature of CPU surface. It also can be used to implement Over/Under-Clocking and

Over/Under-Voltage (Vcore) with higher performance/Lower power consumption. Anyway, the F75133S can be

implemented by user differential application.

In the past, if engineer would like to measure the parts consumption. He could connect a resistance

between power and parts, and then they detected ∆V and capitalized the value to understand the loading

condition. Although the method is convenient and needs just a cheap resistance, but some of the accuracy

issues and power consumption problem will be the critical points. For example, the resistance will cause more

consumption and heat questions if the end-equipment needs mass current to implement. Depends on these

problems, more accuracy and more efficiency sensor chip is necessary. The F75133S will handle previous

trouble.

The F75133S supports automatic PWM duty cycle detection, follows the result of detection to issue

TURBO#、FAULT# and PME# signals for end-application, provides I2C interface for communication, the

programmable Cycle-Length of detection rise the measurement accuracy.

The F75133S is packaged in 8-pin SOP and powered by 3.3V.

2. Feature List

Automatic PWM Duty Cycle Detect

Follows the Result of Detection to Issue TURBO#、FAULT# and PME# Signals for End-application

Programmable Cycle-Length of Detection for Flexible Use and Accuracy

4 Steps 5 Stages Over-Clocking Machine

Un-Hysteresis Function for CPU Over/Under-Clocking/Voltage Implementation

Internal Oscillator for System Implement.

2-Wire I2C Interface

3.3V operation voltage.

8-pin SOP package.

3. Key Specification

Supply Voltage

3.0V to 3.6V

Operating Supply Current

2 mA typ.

Noted: Patented TWI235553