From 8292d59cf04e4a2169efc6525cc25f96e8c1ead9 Mon Sep 17 00:00:00 2001 From: Wolfgang Hottgenroth Date: Wed, 6 Mar 2024 10:44:31 +0100 Subject: [PATCH] doc on reset circuit --- readme.md | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/readme.md b/readme.md index 30a23cf..90994ae 100644 --- a/readme.md +++ b/readme.md @@ -61,3 +61,23 @@ During of loading data into six LEDs: 297us | 100 | | 5.9ms | | 200 | | 11.8ms | + +## Reset Circuitry + +It appears that the output voltage of the power supply raises that slow, that the MCU +will not handle the reset correctly. + +The following circuitry should generate a valid reset signal far enough from the raise +of the supply voltage: + +![](./docs/reset-circuit.jpeg) + +The circuit generates the following signals: + +![](./docs/reset-signal.png) + +Yellow is the supply voltage, green is the voltage at the inverting input of the opamp +(reference voltage), purple is the voltage at the non-inverting input of the opamp at the RC element +and blue finally is the reset signal. Lets hope that the small peak when switching on power +won't hurt. +