Pulster fixe(s) and rework

Joerg Reisenweber joerg at openmoko.org
Thu Mar 5 06:55:22 CET 2009

Am Mi  4. März 2009 schrieb Fox Mulder:
> Johny Tenfinger wrote:
> > On Wed, Mar 4, 2009 at 08:32, Joerg Reisenweber <joerg at openmoko.org> 
> >>> * Change the led transistor power hungry stuff
> >> Guys, this has been fixed for *ALL* FR ever sold!!!
> > 
> > No, no, no. You are right only for GTA02v6. On GTA02v5 (which I have)
> > this has been fixed only for orange and blue LEDs under POWER button.
> > Red AUX button is still power hungry - it is eating 50mA.
> Your mentioned 50mA for the AUX LED is ridiculous. It would burn out
> with this high current. Normal LEDs only use ~20mA and low current LEDs
> ~2mA. 50mA would be for a higher power led which isn't build into the
> freerunner.
> And when you are on battery the AUX led is off by default and even if it
> blinks (like i modified my led behaviour) it isn't really much it uses.
> Ciao,
>      Rainer

The power is consumed by driving a common-emitter transistor driver for LED 
without base resistor. Current flows from GPIO via base to emitter, and it 
for sure had been wiser to drive LED directly from GPIO ;-), instead of 
burning 40mA base current for 10mA collector current. (ballpark numbers)

For the non-fixed AUX LED: I wasn't aware these versions have been sold :-/

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