MAX6651 Datasheet (Maxim) - Fan-Speed Regulators and Monitors

MAX6651, Fan-Speed Regulators and Monitors

The MAX6650/MAX6651 fan controllers use an SMBus/I2C-compatible interface to regulate and monitor the speed of 5VDC/12VDC brushless fans with builtin tachometers.

They automatically force the fan’s tachometer frequency (fan speed) to match a preprogrammed value in the Fan-Speed Register by using an

MAX6651 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