AMC6821

BurrĆBrown Products AMC6821 from Texas Instruments AMC6821 SBAS386C – MAY 2006 – REVISED JULY 2007 Intelligent Temperature Monitor and PWM Fan Controller FEATURES 1 23456 Remote Temperature Sensor: ±2°C Accuracy, 0.125°C Resolution Local Temperature Sensor: ±2°C Accuracy, 0.125°C Resolution PWM Controller PWM Frequency: 10Hz to 40kHz Duty Cycle: 0% to 100%, 8 Bits Automatic Fan Speed Control Loops SMBus Interface Power: 2.7V to 5.5V Package (Green): QSOP-16 (4mm × 5mm) RoHS Compliant APPLICATIONS Notebook and Desktop PCs Network Servers Telecommunications Equipment PC-Based Equipment DLP™ and LCD Projectors VDD GND FAN-FAULT THERM OVR Alarm Detectors AMC6821 SMBus 2 IC Interface SMBALERT SDA SCLK A1 A0 Temperature Data IN+ MUX IN- ADC (11-Bit) On-Chip Temperature Sensor Ref Remote Temperature Sensing TACH-DATA TACH COUNTER TACH PWM Driver PWM-Out PWM-MODE Auto Fan Speed Controller DESCRIPTION The AMC6821 is an intelligent temperature monitor and pulse-width modulation (PWM) fan controller. It is designed for noise-sensitive or power-sensitive applications that require active system cooling. Using either a low-frequency or a high-frequency PWM signal, this device can simultaneously drive a fan, monitor remote sensor diode temperatures, and measure and control the fan speed so that it operates with minimal acoustic noise at the lowest possible speed. The AMC6821 has three fan control modes: Auto Temperature-Fan mode, Software-RPM...