maemo.org - Talk - Is the CA-146C adapter trash?

maemo.org - Talk (https://talk.maemo.org/index.php)

- Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)

- - Is the CA-146C adapter trash? (https://talk.maemo.org/showthread.php?t=49707)

Re: Is the CA-146C adapter trash?

Nokia has two different MicroUSB car chargers. The stronger one delivers 1200mA.

Fter ca-146c, dc-4 is probably down to 500mA :)

Re: Is the CA-146C adapter trash?

Quote:

Originally Posted by shadowjk (Post 605600)

Nokia has two different MicroUSB car chargers. The stronger one delivers 1200mA.

That would be the DC-10, a rather chunky thing. BTW, why does Nokia no longer have any technical info on products like this on their website?

Quote:

Originally Posted by shadowjk (Post 605600)

Fter ca-146c, dc-4 is probably down to 500mA :)

Of course Nokia says nothing about the currents, though they do claim this combination works.

By the way, I tried to get a word to a friend-of-a-friend at the Nokia development department, asking that logging about this kind of events (for example, the dialogue between devices over the MicroUSB port) be made available to the user, so that cases where it doesn't work won't stay "this just doesn't work" type mysteries. For example, it turns out quite a lot of the "no name" brand USB charger devices return more or less random device types to the N900, which often will refuse to talk to them because of this.

Re: Is the CA-146C adapter trash?

Quote:

Originally Posted by RockCreek1 (Post 604838)

If you get a chance and can look up and post online the exact names/models of the chargers you have that do work, that would be much appreciated. Thank you.

V + mA

thats all you need, not spesific models etc....

e: I have 4 CA-146C -adapters, all work perfectly unless using those with 3V 300mA chargers that almost can charge nokia 1100 in 5 hours....

Re: Is the CA-146C adapter trash?

Quote:

Originally Posted by extechop (Post 615296)

That would be the DC-10, a rather chunky thing. BTW, why does Nokia no longer have any technical info on products like this on their website?

Yeah it's very annoying. You'd think they no longer want to sell stuff.

Quote:

By the way, I tried to get a word to a friend-of-a-friend at the Nokia development department, asking that logging about this kind of events (for example, the dialogue between devices over the MicroUSB port) be made available to the user, so that cases where it doesn't work won't stay "this just doesn't work" type mysteries. For example, it turns out quite a lot of the "no name" brand USB charger devices return more or less random device types to the N900, which often will refuse to talk to them because of this.

For the powerusers/developers out there:

/sys/class/i2c-adapter/i2c-1/1-0048/twl4030_usb/
contains some nodes. 'vbus' is probably 1 when there is voltage on the microusb port. linkstat seems to change whenever something is connected. I am guessing microamps_requested* either shows how much power n900 was given permission to draw, or how much it asked for..

/sys/devices/platform/musb_hdrc/

has the node 'charger', which is 1 whenever a charger that identifies itself with shorted d+/d- is connected. vbus is probably same as before. Other intersting nodes like 'mA' and 'connect'.

What's missing is sysnodes for the actual charger. I get the impression bme is very lazy about checking the charger status, not noticing if the charger aborted because of too crap power available on the musb port. It will also, of course, happily claim charging when charging from an otherwise healthy powersource that's unable to charge faster than n900 uses power.

Re: Is the CA-146C adapter trash?

Quote:

Originally Posted by extechop (Post 605162)

I now have a Nokia round plug charger DC-4, which is also supposed to deliver 890 mA, let's see how well that works in the car with the CA-146C and the N900.

This is a combination that seems to work, albeit not very quickly, and the CA-146C does get hot.

I've ordered this Car Cigarette Powered 1000mA USB Adapter/Charger (there is also a white version). "evilalex" dissected it and did measurements, coming to the conclusion it does do what was promised. It just seems to be sold out at the moment, they should have more in a few days.

Re: Is the CA-146C adapter trash?

I doubt CA-146C can pass through 1000mA...

I don't mean that it wont work, just that you'll see something like 300-500mA after it

Re: Is the CA-146C adapter trash?

Quote:

Originally Posted by zlatko (Post 605143)

I normally charge my N900 overnight using older Nokia charger ACP-12E(800mA output) via CA-146 adapter. Charging takes ~ 2.5 hours. I tried to use AC-3E(350mA) with the idea that charging will take longer and thus the battery will start draining later so I will get few more hours autonomy, but with that charger charging almost never ends.

Here is the point. So hop hop and check out what your charger outputs. I realized what was going on after I once tried to charge N900 with 1100's charger(AC-3E) which just isn't enough to any modern smartphone and CA-146C.

Re: Is the CA-146C adapter trash?

Quote:

Originally Posted by shadowjk (Post 795183)

I doubt CA-146C can pass through 1000mA...
I don't mean that it wont work, just that you'll see something like 300-500mA after it

Indubitably, but the 1000 mA adapter I linked to above has an USB socket – I no longer would need the CA-146C :p