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AMC6821 Datasheet(PDF) 1 Page - Texas Instruments |
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AMC6821 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 56 page  AMC6821 BurrBrown Products from Texas Instruments 1 FEATURES DESCRIPTION APPLICATIONS Alarm Detectors AMC6821 FAN-FAULT V DD THERM OVR IN+ IN- Remote Temperature Sensing Temperature Data MUX On-Chip TemperatureSensor Ref ADC (11-Bit) SMBus I C 2 Interface PWM Driver TACH-DATA TACHCOUNTER AutoFanSpeed Controller PWM-MODE PWM-Out TACH A0 A1 SCLK SDA SMBALERT GND AMC6821 SBAS386C – MAY 2006 – REVISED JULY 2007 Intelligent Temperature Monitor and PWM Fan Controller 23456 • Remote Temperature Sensor: The AMC6821 is an intelligent temperature monitor ±2 °C Accuracy, 0.125°C Resolution and pulse-width modulation (PWM) fan controller. It is designed for noise-sensitive or power-sensitive • Local Temperature Sensor: applications that require active system cooling. Using ±2 °C Accuracy, 0.125°C Resolution either a low-frequency or a high-frequency PWM • PWM Controller signal, this device can simultaneously drive a fan, • PWM Frequency: 10Hz to 40kHz monitor remote sensor diode temperatures, and Duty Cycle: 0% to 100%, 8 Bits measure and control the fan speed so that it operates with minimal acoustic noise at the lowest possible • Automatic Fan Speed Control Loops speed. • SMBus Interface The AMC6821 has three fan control modes: Auto • Power: 2.7V to 5.5V Temperature-Fan mode, Software-RPM mode, and • Package (Green): QSOP-16 (4mm × 5mm) Software-DCY mode. Each mode controls the fan • RoHS Compliant speed by changing the duty cycle of a PWM output. Auto Temperature-Fan mode is an intelligent, closed-loop control that optimizes fan speed according to user-defined parameters. This mode • Notebook and Desktop PCs allows the AMC6821 to run as a stand-alone device • Network Servers without CPU intervention; the fan can continue to be • Telecommunications Equipment controlled (based on temperature measurements) even if the CPU or system locks up. Software-RPM • PC-Based Equipment mode is a second closed-loop control. In this mode, • DLP™ and LCD Projectors the AMC6821 adjusts the PWM output to maintain a consistent fan speed at a user-specified target value; that is, the device functions as a fan speed regulator. Software-RPM mode can also be used to allow the AMC6821 to operate as a stand-alone device. The third mode, Software-DCY, is open-loop. In Software-DCY mode, the PWM duty cycle is set directly by the value written to the device. The AMC6821 has a programmable SMBALERT output to indicate error conditions and a dedicated FAN-FAULT output to indicate fan failure. The THERM pin is a fail-safe output for over-temperature conditions that can be used to throttle a CPU clock. Additionally, the OVR pin indicates the over-temperature limit as well. All of the alarm thresholds are set through the device registers. The AMC6821 is available in a QSOP-16 package. Patents 7, 083,328 and 7,098,617. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 DLP is a trademark of Texas Instruments. 3 Pentium M, Pentium-IV are trademarks of Intel. 4 JMC is a trademark of JMC Products. 5 I2C is a trademark of Philips International, Inc. 6 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2006–2007, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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