Jean Delvare wrote: > On Sat, 02 Jun 2007 20:48:46 +0100, Phil Endecott wrote: >> So, has anyone else had any experience with this board? Has PWM been >> known to work with other boards with this chip? Is it common for fan >> connectors to not have PWM control? > > I have a Jetway K8M8MS motherboard with a Fintek F71805F chip, where > pwm1 controls fan1. So I am reasonably certain that fan speed control is > properly implemented by my f71805f driver. However, you are not the > first one to report about being enable to control the fans using this > driver. It seems to be common that motherboard manufacturers don't > bother wiring things properly :( Thanks Jean. I have scoped the three outputs and they all seem to be outputting the expected PWM waveforms. Curiously, the PWM1 pin has a track that goes somewhere; it's not a fan (unless I have screwed up) so what could it be? I'm a bit concerned that it is used for something else that I'm going to break... Anyway I have constructed a driver circuit based on the example from the datasheet and will be trying it out soon. The most difficult part was attaching a wire to the pin; despite a reasonably fine soldering iron and a magnifying glass I still managed to bridge it to its neighbours. I have glued the wire down to the board as strain-relief for my soldering, and will try it out once the glue is dry. Regards, Phil.
