Openmoko Bug #2310: charging N900 with gta02 causes the gta02 to overheat

Openmoko Public Trac bugs at
Fri Sep 11 12:35:52 CEST 2009

#2310: charging N900 with gta02 causes the gta02 to overheat
 Reporter:  lindi            |          Owner:  openmoko-kernel     
     Type:  defect           |         Status:  new                 
 Priority:  normal           |      Milestone:                      
Component:  System Software  |        Version:  unspecified         
 Severity:  normal           |       Keywords:  battery pmu charging
 Haspatch:  0                |      Blockedby:                      
Estimated:                   |    Patchreview:                      
 Blocking:                   |   Reproducible:                      

Comment(by lindi):

 Some comments from IRC:

 < DocScrutinizer> lindi-: could you check USB_FLT aka GPM5 GPIO

 < DocScrutinizer> maybe AAT1276 does no current limiting but simply
 triggers USB_FLT. Maybe we have a short on datalines. Maybe we have
 massive drop of efficiency on choke getting satturated and thus all the
 current runs into that choke and heats it up (i prefer that idea for now)

 < PaulFertser> DocScrutinizer-8: btw, i would be amazed to know N900
 actually can draw more than 500mA without negotiating.

 I have not removed the main can yet so I can not investigate what damage
 might have occured to the components. I also can not measure USB_FLT since
 I don't have the N900 anymore to test with.

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openmoko trac

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