Project

General

Profile

Bug #1870

V1 hardware does not enumerate as long as JP4 is set

Added by roh about 1 year ago. Updated 5 months ago.

Status:
Closed
Priority:
Normal
Assignee:
Target version:
-
Start date:
12/05/2016
Due date:
% Done:

100%

Spec Reference:

Description

if JP4 is connected at powerup (usb connect) the cp2105 stays in reset.
this happens since its _RST is pulled up to VIO which stays powered off till the cp2105 comes out of reset and pulls _SUSPEND high which in turn enables the ldo for VIO.

the solution is to disconnect _SUSPEND of the cp21015 and _SUSPEND of the ldo and pull the ldo side high against Vbus or VDD_3V45 (does not seem to matter which)

History

#1 Updated by roh about 1 year ago

rework manual:

- cut trace right next to R1
- place 0Ohm over the pad 3 of U3 and VBus on C6 (0603 or 0805)

#2 Updated by laforge about 1 year ago

  • Checklist item re-work the existing units @ sysmocom added
  • Assignee set to roh
  • % Done changed from 0 to 10

#3 Updated by laforge about 1 year ago

  • Checklist item change design for future production runs added

#4 Updated by laforge about 1 year ago

  • Checklist item change design for future production runs set to Done

design files updated in git commit 9b5d540b1ffb669effeb4ea523254935e5444278

#5 Updated by roh 8 months ago

  • Status changed from New to Resolved
  • % Done changed from 10 to 100

reworked all existing v1 boards

#6 Updated by laforge 5 months ago

  • Status changed from Resolved to Closed

Also available in: Atom PDF