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doc on reset circuit

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Wolfgang Hottgenroth 2024-03-06 10:44:31 +01:00
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@ -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.