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#128 USB bus power destroys MCU PA07

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öppnade 4 år sedan av Michael Schloh von Bennewitz · 1 kommentarer
Michael Schloh von Bennewitz kommenterad 4 år sedan

USB bus power destroys MCU PA07

Problem environment

The electrical area above the ball at F3 (bottom left corner corresponding with PA07) is smoke burned and destroyed when 5V bus power is present.

Steps to reproduce

  1. Observe the area above ball F3
  2. Insert a powered USB cable in J2

Expected result

Part of the MCU should not be destroyed when bus power is applied.

Actual result

Part of the MCU is destroyed and magic smoke escapes.

Workaround

Cut the trace from C5 to PA07.

Severity level

This is high priority because circuit damage is imminent.

# USB bus power destroys MCU PA07 ## Problem environment The electrical area above the ball at F3 (bottom left corner corresponding with PA07) is smoke burned and destroyed when 5V bus power is present. ## Steps to reproduce 1. Observe the area above ball F3 1. Insert a powered USB cable in J2 ## Expected result Part of the MCU should not be destroyed when bus power is applied. ## Actual result Part of the MCU is destroyed and magic smoke escapes. ## Workaround Cut the trace from C5 to PA07. ## Severity level This is **high priority** because circuit damage is imminent.
Michael Schloh von Bennewitz added the
bug
label 4 år sedan
Michael Schloh von Bennewitz lade till denna till milstolpe Final schematic and layout design 4 år sedan
Michael Schloh von Bennewitz kommenterad 4 år sedan
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Resolved by 95df659.

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