The MAX31790ATI+ is a 6-channel PWM output fan RPM controller in 28 pin TQFN package. It controls the speeds of up to six fans using six independent PWM outputs. The desired fan speeds (or PWM duty cycles) is written through I2C interface. The outputs drive '4-wire' fans directly or can be used to modulate fan's power terminals using an external pass transistor. Tachometer inputs monitor fan tachometer logic outputs for precise (±1%) monitoring and control of fan RPM as well as detection of fan failure. Six pins are dedicated tachometer inputs. Any of the six PWM outputs can also be configured to serve as tachometer inputs. The PWM_START inputs select PWM output status at start-up to ensure appropriate fan drive when power is first applied. To ensure low acoustic impact of fan control, all changes in PWM duty cycle take place at a controlled, programmable rate. It is used in servers, networking and telecom.
Supply voltage range is 3V to 5.5V
Operating temperature range from -40°C to 125°C
Improves system reliability
I2C bus interface with timeout and watchdog
Provides precise fan control and monitoring for large fan count applications
Controls up to six independent fans with PWM drive
Up to 12 tachometer inputs
Controlled duty cycle rate of change for best acoustics
(EN)
