MAXIM INTEGRATED PRODUCTS MAX6650/MAX6651 Fan-Speed Regulators Monitors with SMBus/I2C-Compatible Interface handbook
Datasheet
MAX6650/MAX6651 are fan controllers for 5VDC/12VDC brushless fans with built-in tachometers. They support SMBus™/I2C* interface, can monitor fan speed and automatically adjust voltage to match the pre-programmed speed.
