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| 07:54.13 | DocScrutinizer05 | ((so they must be single-digit cents in the rest of the world)) rather like 3 digit cents |
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| 08:52.27 | DocScrutinizer05 | arossdotme: there is no such resistor to "put across USB socket", so also no value for it |
| 08:53.23 | DocScrutinizer05 | arossdotme: and yes, the docs are charger amendment to USB spec |
| 08:53.54 | DocScrutinizer05 | but you don't want to read those since they are obfuscated wording |
| 08:56.27 | DocScrutinizer05 | http://en.wikipedia.org/wiki/USB#Power for a short introduction |
| 08:57.33 | DocScrutinizer05 | http://web.archive.org/web/20140329080504/http://www.usb.org/developers/devclass_docs/batt_charging_1_1.zip for the gory details |
| 08:59.34 | DocScrutinizer05 | http://www.instructables.com/id/Modify-a-cheap-USB-charger-to-feed-an-iPod-iPhone/ for *CHRAGER*, *NOT* device side |
| 09:00.14 | DocScrutinizer05 | generally chargers are dumb PSU and don't need _anything_ to provide whatever they can |
| 09:01.04 | DocScrutinizer05 | it's up to your device to *detect* the resistors in charger to determine how much power your device may draw from it |
| 09:01.48 | DocScrutinizer05 | or you simply ignore all such detection hassly and draw as much as you need, hoping that the charger won't explode ;-) |
| 09:02.01 | DocScrutinizer05 | hassle* |
| 09:23.14 | whitequark | in a charger you often short D+ D- to indicate that it's well |
| 09:23.15 | whitequark | a charger |
| 09:23.25 | whitequark | the device will then usually place no current limit and draw 2A or so |
| 09:23.31 | whitequark | tablets even 4A sometimes |
| 09:27.23 | DocScrutinizer05 | 4A via USB? Duh! |
| 09:28.28 | whitequark | some large 10" or such tablet |
| 09:28.34 | whitequark | crazy but they do it |
| 09:29.01 | DocScrutinizer05 | generally it's correct, there are 3 ways a charger can signal it's a charger: ID pin resistor to GND, D+/- short, and a number of resistor networks on D+/- to signal several apple-compatible chargers of different power |
| 09:29.44 | DocScrutinizer05 | a device however usually needs one particular of those 3 alternative/complementary methods |
| 09:30.06 | DocScrutinizer05 | only a very few devices check for more than just one method |
| 09:30.22 | DocScrutinizer05 | e.g. Neo900 will |
| 09:30.56 | DocScrutinizer05 | it checks for all D+/- based signaling |
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| 13:10.01 | arossdotme | arr ok, i see so in this case i don't need to do anything fancy. |
| 13:10.06 | arossdotme | thanks muchly |
| 13:11.59 | arossdotme | the resistor across the data,id pins are for the devices sake and not for the charger... what was i thinking... silly me |
| 13:12.20 | arossdotme | but thx for the links |
| 13:12.26 | arossdotme | i'll have a loot in a bit |
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