Using standby with DC-DC system - Page 2

EBJUSTIN · 12-01-2003, 09:33 PM

Quote: Originally Posted by MeanGT

EBJUSTIN, I had the exact same setup you are using, with the +5v regulator into the purple wire setup. It worked, the only thing I didn't like was that for some reason my power draw would vary quite a bit, at some times it would be only 180ma, but sometimes it would draw up to 900+ma!! Perhaps it was my USB devices.

I finally gave up on it, and am instead using my regulator to power my GPS unit

. I will follow your results closely to see if you resolve the USB power issues.

I may have to hardwire the standard +5V to power the USB instead of the +5VSB this way the USB devices would lose power during standby....I'm concerned that if I do that the USB devices may not wake up properly when coming out of standby...well there is only one way to find out

EBJUSTIN · 12-01-2003, 11:19 PM

Well it turns out that everything draws ~140mA if I leave the XM-PCR disconnected.

USB devices:
Powermate
Serial 2 USB Convertor for CIMR IR remote
Gyration RF receiver for moust/keyboard

It appears that the drivers for the powermate and rf receiver put the devices in a low power state because the LED's on both devices turn off even though they are still powered. Unfortunately the XM-PCR draws ~120mA in standby or when off

I'll have to find a way to unpower it when in standby.

I tried disconnecting all usb cables after putting the carputer in standby, reconnected them and woke up the computer.....the powermate and IR remote were not recognized...I had to restart the computer before they were functional. This is probably why the Epia keeps USB devices powered during standby.