Modifying a USB cable to charge iPod without PC connection

[Man-wai Chang]

http://www.gizmodo.com.au/2008/07/simple_hack_turns_usb_charger_units_into_iphone_chargers-2/


+5V ---50k --- D-
|
10k
|
GND ---40K --- D+

Is this safe? Would it work?

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 22:00:02 up 5 days 2:01 1 user load average: 1.10 1.08 1.05
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[Man-wai Chang]

+5V ---50k --- D-

Show your work -- why make people duplicate your analysis?

I dont' wanna kill my iPod Touch...

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 23:40:01 up 5 days 3:41 1 user load average: 1.00 1.04 1.05
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[Jasen Betts]

http://www.gizmodo.com.au/2008/07/simple_hack_turns_usb_charger_units_into_iphone_chargers-2/


+5V ---50k --- D-
|
10k
|
GND ---40K --- D+

Is this safe? Would it work?

As you're not putting more than 3.3V on the data lines it looks fine
to me.

There's a standard for power-only USB sockets.
it's basically 5V and some resistors, I'm not sure how close to it
that layout it is, I'd research and try the standard way first.

 

[Jasen Betts]

http://www.gizmodo.com.au/2008/07/simple_hack_turns_usb_charger_units_into_iphone_chargers-2/


+5V ---50k --- D-
|
10k
|
GND ---40K --- D+

Is this safe? Would it work?

At initial glance it seems good, but I haven't read the whole USB
charging specification.

http://www.usb.org/developers/devclass_docs/Battery_Charging_V1_2.zip

 

[Man-wai Chang]

At initial glance it seems good, but I haven't read the whole USB

charging specification.
http://www.usb.org/developers/devclass_docs/Battery_Charging_V1_2.zip

Too much information.... -_-"

Are you saying that the voltage over D+ and D- should be smaller than
2.0V and 2.5V respectively?

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 18:57:01 up 5 days 22:58 1 user load average: 1.01 1.06 1.05
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[Jasen Betts]

Too much information.... -_-"

Are you saying that the voltage over D+ and D- should be smaller than
2.0V and 2.5V respectively?

The only maximum voltage number I saw quoted for those pins was 3.6V
I skimmed it, mostly I did searches and looked at the diagrams.