#118 Capacitor C18-19 values are wrong

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Michael Schloh von Bennewitz4年前に作成 · 1件のコメント

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 がラベル
bug
を追加 4年前
Michael Schloh von Bennewitz がマイルストーン Layout design に追加 4年前
Michael Schloh von Bennewitz がマイルストーンを Layout design から Final schematic and layout design へ変更 4年前
Michael Schloh von Bennewitz4年前 にコメント
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Resolved in a6fcbdf.

Resolved in a6fcbdf.
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