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| The Following User Says Thank You to peppino For This Useful Post: | ||
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2011-07-17
, 21:07
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Posts: 19 |
Thanked: 16 times |
Joined on Sep 2010
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#123
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Maybe the problem is desktop pc with windows. In my pc with Linux the charge work always good. I need about 4 hours for full charge.
I discovered somethings. With 200Ohms beetween D+ and D- the charge is 1000mA Wall Adapter.
In this post http://talk.maemo.org/showpost.php?p...&postcount=861 i read the settings of BME on the chip BQ24150. So I tried to stop BME and launch the script, the charge works well, but I don't have none graphical feedbacks.
Can I set the registers of BQ24150 while the BME is running?
Can I tell to BME with socket unix start the charge?
Thank you
EDIT:
In the script I changed the value of register 0x01 with 0x48 (500mA)
Last edited by peppino; 2011-07-17 at 21:11.
I discovered somethings. With 200Ohms beetween D+ and D- the charge is 1000mA Wall Adapter.
In this post http://talk.maemo.org/showpost.php?p...&postcount=861 i read the settings of BME on the chip BQ24150. So I tried to stop BME and launch the script, the charge works well, but I don't have none graphical feedbacks.
Can I set the registers of BQ24150 while the BME is running?
Can I tell to BME with socket unix start the charge?
Thank you
EDIT:
In the script I changed the value of register 0x01 with 0x48 (500mA)
Last edited by peppino; 2011-07-17 at 21:11.
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2011-07-18
, 14:07
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Posts: 1,258 |
Thanked: 672 times |
Joined on Mar 2009
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#124
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bme is not configurable.
Even if the charger can't get sufficient current it'll generally take what it can get, down to 300-400mA or so as long as the voltage is sufficiently stabilized.
Even if the charger can't get sufficient current it'll generally take what it can get, down to 300-400mA or so as long as the voltage is sufficiently stabilized.
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2011-10-14
, 12:41
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Posts: 361 |
Thanked: 219 times |
Joined on Sep 2010
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#125
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Originally Posted by Rebski
This may also help:
In trying to source the Energizer PC007 (PC07?) without much joy.
Is this the sort of thing we are looking for
http://www.lindy.co.uk/ipad-usb-char...FZBO4Qod_ms1jg
http://talk.maemo.org/showthread.php?t=75300
| The Following User Says Thank You to PMaff For This Useful Post: | ||
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2012-10-14
, 14:07
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#126
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Originally Posted by Master of Gizmo
As i've already written in another thread: The spec does not say to shorten them. Instead the spec says that you are supposed to connect them via 200 ohms. The n900 may work fine when shortening them, but shortening something always means that some significant power may flow over this short circuit. Using 200ohms instead is safe for any hardware as the current over the resistor is limited to 3.3V/200Ohms = 17mA.
These resistors cost nothing and may protect that hardware, so they are really a good investment.
Originally Posted by peppino
Hi, I trying this project for load battery on the road.
5V is generated without problem, the signal D- and D+ has 1.9V, when I try to attach N900 to my step up the charge not start. In dmesg I see:
I tried also with 0.7V on D- D+ as written in batt_charging_1_1_FINAL.pdf but nothing.Code:twl4030_usb twl4030_usb: HW_CONDITIONS 0x50/80; link 1 twl4030_usb twl4030_usb: HW_CONDITIONS 0xd0/208; link 2
I have the kernel 2.6.28.10power46.
I would like start the charge with only 500mA and not 1000mA. With 200 Ohms between D- and D+ which is the maximum source current?
Thank you for the help
Originally Posted by zimon
I browsed through all these 10 pages rather quickly, so sorry if this is already answered;
Could this however correct way (USB standard) of demand to shortcircuit D+ and D- be overridden somehow in software, through dbus or kernel parameter perhaps?
It would just be so convenient to click something from a menu, than always carry both either self made or bought adapter and normal USB-data cable.
So both synchronizations, fast data transfers and charge anywhere could be achieved.
Since somebody referred to this thread today, I like to add some late clarifications:
The spec says "SHORT D+ and D-", the 200Ohm are MAXIMUM. For any EE that's a pretty unambiguous spec that defines a valid range of 0 .. 200 Ohm for the shorting - pin to pin, including all cable resistance, contact resistance and all, which is what the 200 Ohm are meant to specify: you must not exceed this value.
Bottom line: using resistor is BAD, short the pins by simple solder jumper.
The max current with shorted (by significantly less than MAX 200Ohm, best value:0) D-pins is basically undefined, N900 will try to draw up to ~900mA from any charger that signals "fastcharger" by the shorting method.
For charging in software, there's shadowJK's http://enivax.net/jk/n900/charge21.sh.txt script now, based on my original draft quoted some posts back.
Alternative source edited by me for 500mA charge: http://maemo.cloud-7.de/maemo5/patch...t__UNTESTED.sh
Keep in mind you probably have to `stop bme`, otherwise the charging script and BME will conflict and not work correctly.
/j
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
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2012-11-06
, 08:47
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Posts: 77 |
Thanked: 53 times |
Joined on Dec 2007
@ Chester, CA
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#127
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I tried the data pins short trick today, i've heard of it before but never had to use it until now.
I was trying to charge my n900 of a solar battery/charger controller with a usb out, and wasn't getting anything. I tore the usb module out snice it has nice leads attached to it on a pcb, and shorted the data pins with a quick joint.
Hooked it up to a sepic tuned for 5v running off 8x nimh aa's in two sets of four (6v, ~4ah), soldered the leads to the output on the sepic and it charged now.
So what exactly does this mean in terms of mah's being put into the battery with the pins shorted, or time it takes to charge? More/less than the stock 1000ma 5v input?
I assume even if i get the full 2a my sepic is rated for, it should be fine, as i've hooked my n900 alone up to a 2a usb hub and nothing bad happened. I doubt its like a led where it takes all the current it can get, and all that really matters is the voltage (up to a point, super high current could short circut your phone).
Anyway, female usb cables are dirt cheap, this works just fine with an aftermarket usb cable as well. Get a cheap sepic, a lipo pack, and a female usb port and you got a nice little usb backup battery thats not rediculously overpriced, diy, and easy to upgrade parts/batteries.
I was trying to charge my n900 of a solar battery/charger controller with a usb out, and wasn't getting anything. I tore the usb module out snice it has nice leads attached to it on a pcb, and shorted the data pins with a quick joint.
Hooked it up to a sepic tuned for 5v running off 8x nimh aa's in two sets of four (6v, ~4ah), soldered the leads to the output on the sepic and it charged now.
So what exactly does this mean in terms of mah's being put into the battery with the pins shorted, or time it takes to charge? More/less than the stock 1000ma 5v input?
I assume even if i get the full 2a my sepic is rated for, it should be fine, as i've hooked my n900 alone up to a 2a usb hub and nothing bad happened. I doubt its like a led where it takes all the current it can get, and all that really matters is the voltage (up to a point, super high current could short circut your phone).
Anyway, female usb cables are dirt cheap, this works just fine with an aftermarket usb cable as well. Get a cheap sepic, a lipo pack, and a female usb port and you got a nice little usb backup battery thats not rediculously overpriced, diy, and easy to upgrade parts/batteries.
| The Following User Says Thank You to eleseur For This Useful Post: | ||
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2012-11-11
, 12:46
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Posts: 1,258 |
Thanked: 672 times |
Joined on Mar 2009
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#128
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N900 insructs its charger chip to charge at max 950mA. How much that translates to in the input depends on battery voltage and the efficiency of the charging chip.
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2013-09-02
, 08:28
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Posts: 7 |
Thanked: 3 times |
Joined on Jan 2008
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#130
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https://www.facebook.com/photo.php?f...51890228794497
probably I should have tried the software solutions before demolishing the cable, but I had quite a few spare ones and I enjoy soldering. this one works fine.
probably I should have tried the software solutions before demolishing the cable, but I had quite a few spare ones and I enjoy soldering. this one works fine.
| The Following User Says Thank You to mariotomo For This Useful Post: | ||
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| charging, nokia n900 |
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All times are GMT. The time now is 09:04.
5V is generated without problem, the signal D- and D+ has 1.9V, when I try to attach N900 to my step up the charge not start. In dmesg I see:
I have the kernel 2.6.28.10power46.
I would like start the charge with only 500mA and not 1000mA. With 200 Ohms between D- and D+ which is the maximum source current?
Thank you for the help