Pulster fixe(s) and rework
Quakeman1 at gmx.net
Thu Mar 5 01:19:07 CET 2009
Andy Green wrote:
> Somebody in the thread at some point said:
> | 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.
> Johnny Tenfinger is right despite it sounds strange. On some or all A5s
> there is no base current limit resistor on the bipolar transistor used
> to light the AUX LED.
> This "50mA" fault current then flows not through the LED (which has a
> reasonable series current limit resistor), but through the GPIO IO cell
> and the driver transistor base.
If this is the problem than it really is a bad design flaw...
Maybe i should test the AUX LED on my gta02v5 how much current it uses
when it is on.
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