The TC654 is a dual SMBus™ PWM fan speed controller with fan fault detection. This device is suitable for brushless DC motors. It permits temperature proportional fan speed control which lowers ...

Here's an odd one. I've got a site with two C2921 units (one from an ISP and one doing internal routing) where the fan speeds differ greatly. The unit the site controls is mounted directly underneath ...

Speed reporting (the "RPM" wire) is a pulse per rotation, so the only way it'd actually be OK is if both fans spun at exactly the same speed (unlikely due to manufacturing tolerances and varying ...