[Bug 16] New: bluetooth pullup / pulldown resistors

bugzilla-daemon at gta01.hmw-consulting.de bugzilla-daemon at gta01.hmw-consulting.de
Wed Jan 3 23:58:38 CET 2007


           Summary: bluetooth pullup / pulldown resistors
           Product: GTA01 (Neo1973)
           Version: GTA01Bv2
          Platform: GTA01
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: Bluetooth
        AssignedTo: sean_chiang at fic.com.tw
        ReportedBy: laforge at openmoko.org

I seem to be unable to get the Bluetooth USB device to show up at the
S3c2410 OHCI.

I have set BT_EN(GPB5) to 'high' level and configured the D1REG of the
PMU to 3.1 Volts.   Even after manually causing a reset on the USB bus,
there is no

>From looking at the schematics, it seems like there are by default no
pullup/pulldown resistors.  The resistors are all marked as NC.

I think, much like with any USB device, we'll need at least the pullup
from D+ to +3.3V  This should be connected to either BT_3V15 or to
BT_EN, since this way the software can cause a bus reset by switching
off either of them.

In the schematics, this seems to be R7705, where a 1.5kOhms resistor
should be used.

I'm also not sure whether we can live without the 15kOhms pulldown
resistors on D+ and D-, marked R7709 and R7710 in the schematics.

Since I don't yet have a component placement PDF for GTA01Bv2 (would you
_please_ always include this automatically with the schematics?), I
can't really tell whether they are indeed NC or actually present.

If you can tell me the locations, I'm confident I can connect matching
resistors - however, I don't have anything smaller than 0805 in stock
here, but I guess I will be able to fix it with some magnet wire or the

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