No, we do not recommend that you leave the FULL_SPEED pin on the MAX31790 floating. When a pin is left floating, there is no guarantee of what state the pin will be in. If the part is detecting the floating…
The Rate of Change Control is a large factor in stable fan feedback in RPM mode. When the MAX31790 is trying to reach a programmed TACH count, it increments the duty cycle. The PWM Rate-of-Change setting…
We can use Fan Fault Mask Registers (12h, 13h) to mask faults on selected fans from asserting the FAN_FAIL output.
Also in PWM mode you can set the target duty cycle of the unused fans as zero to mask…
We can use Fan Fault Mask Registers (12h, 13h) to mask faults on selected fans from asserting the FAN_FAIL output.
Also in PWM mode you can set the target duty cycle of the unused fans as zero to mask…
Formula to calculate the speed in RPM from TACH register value,
RPM = 60*SR*8192/(NP * TACH count decimal value)
where,
SR - 1, 2, 4, 8, 16, or 32. This is the number of tachometer periods over…
In RPM mode when the fan’s speed is near the target speed, that is, when the TACH count is near the TACH target count, the control loop dynamics can often be improved by slowing the rate of change of the…
One possibility is that the ~FULL_SPEED input pin is near ground level. If you have the pin floating it may be pulled near common ground. If this pin is at a voltage Low, all fans will be forced to full…
Question: MAX31790 is a 5V part, if my motor is 12V. Do i need level translator between motor and the driver?
Answer: 12V should only be supplied to the fan and not connect to the MAX31790 directly…
