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MAX6651EEE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6651EEE Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 25 page  General Description The MAX6650/MAX6651 fan controllers use an SMBus/I2C-compatible interface to regulate and moni- tor the speed of 5VDC/12VDC brushless fans with built- in tachometers. They automatically force the fan’s tachometer frequency (fan speed) to match a prepro- grammed value in the Fan-Speed Register by using an external MOSFET or bipolar transistor to linearly regu- late the voltage across the fan. The MAX6650 regulates the speed of a single fan by monitoring its tachometer output. The MAX6651 also regulates the speed of a sin- gle fan, but it contains additional tachometer inputs to monitor up to four fans and control them as a single unit when they are used in parallel. The MAX6650/MAX6651 provide general-purpose input/output (GPIO) pins that serve as digital inputs, digital outputs, or various hardware interfaces. Capable of sinking 10mA, these open-drain inputs/outputs can drive an LED. To add additional hardware control, con- figure GPIO1 to fully turn on the fan in case of software failure. To generate an interrupt when a fault condition is detected, configure GPIO0 to behave as an active- low alert output. Synchronize multiple devices by set- ting GPIO2 (MAX6651 only) as an internal clock output or an external clock input. The MAX6650 is available in a space-saving 10-pin µMAX® package, and the MAX6651 is available in a small 16-pin QSOP package. ________________________Applications RAID Desktop Computers Servers Networking Workstations Telecommunications ____________________________Features ♦ Closed/Open-Loop Fan-Speed Control for 5V/12V Fans ♦ 2-Wire SMBus/I2C-Compatible Interface ♦ Monitors Tachometer Output Single Tachometer (MAX6650) Up to Four Tachometers (MAX6651) ♦ Programmable Alert Output ♦ GPIOs ♦ Hardware Full-On Override ♦ Synchronize Multiple Fans ♦ Four Selectable Slave Addresses ♦ 3V to 5.5V Supply Voltage ♦ Small Packages 10-Pin µMAX (MAX6650) 16-Pin QSOP (MAX6651) Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface MAX6650/MAX6651 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. EVALUATION KIT AVAILABLE 19-1784; Rev 5; 12/12 Ordering Information µMAX is a registered trademark of Maxim Integrated Products, Inc. + Denotes a lead(Pb)-free/RoHS-compliant package. MAX6650 VCC SCL 10k Ω SDA GPIO0 OUT ADD GND FB TACH0 VCC 3V TO 5.5V VFAN 5V OR 12V CCOMP 10 μF SMBus/I2C INTERFACE GPIO1 LED FAN FULL ON ALERT Typical Operating Circuit Pin Configurations appear at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX6650EUB -40 °C to +85°C 10 µMAX MAX6650EUB+ -40 °C to +85°C 10 µMAX MAX6651EEE -40 °C to +85°C 16 QSOP MAX6651EEE+ -40 °C to +85°C 16 QSOP |
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