Integrated Technology Express, Inc.: Their IT8702F chip has twelve logical devices integrated. One of them is a fan speed controller responsible for controlling three fan speeds through three 128 steps of Pulse width modulation (PWM) output pins and to monitor three fans' tachometer inputs. Their IT8712 chip also provides the latest Environment Control initiatives, such as H/W Monitor, Fan Speed Controller and ITE's "SmartGuardian" function?
Pulse width modulation