#118 Capacitor C18-19 values are wrong

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aperto 4 anni fa da Michael Schloh von Bennewitz · 1 commenti

Capacitor C18-19 values are wrong

Problem environment

The low speed external (LSE) crystal load capacitance is fixed but the stray capacitance is not, and our board adds more capacitance than is reflected in the schematic.

Steps to reproduce

  1. Use a oscilloscope
  2. Test the LSE frequency

Expected result

The LSE frequency (according to load capacitance and C18/C19 is exactly the specified value.

Actual result

The LSE frequency is so wrong, that DFLL and DPLL clocks cannot synchronise to it.

Severity level

This is high priority because the MCU clocks fail to lock and program execution is accordingly corrupted.

# Capacitor C18-19 values are wrong ## Problem environment The low speed external (LSE) crystal load capacitance is fixed but the stray capacitance is not, and our board adds more capacitance than is reflected in the schematic. ## Steps to reproduce 1. Use a oscilloscope 1. Test the LSE frequency ## Expected result The LSE frequency (according to load capacitance and C18/C19 is exactly the specified value. ## Actual result The LSE frequency is so wrong, that DFLL and DPLL clocks cannot synchronise to it. ## Severity level This is **high priority** because the MCU clocks fail to lock and program execution is accordingly corrupted.
Michael Schloh von Bennewitz added the
bug
label 4 anni fa
Michael Schloh von Bennewitz aggiunta alle pietre miliari Layout design 4 anni fa
Michael Schloh von Bennewitz pietra miliare modificata da Layout design a Final schematic and layout design 4 anni fa
Michael Schloh von Bennewitz 4 anni fa ha commentato
Proprietario

Resolved in a6fcbdf.

Resolved in a6fcbdf.
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