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Use embedded Watchdog #11

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opened 2022-11-16 03:04:56 +01:00 by o.winkels · 2 comments
o.winkels commented 2022-11-16 03:04:56 +01:00
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Ditch UCC, use STM Watchdog + GPIO

-> Implement PoR in SW

Ditch UCC, use STM Watchdog + GPIO -> Implement PoR in SW
o.winkels self-assigned this 2022-11-16 03:07:20 +01:00
o.winkels added this to the Schaltplanfreeze milestone 2022-11-16 03:09:56 +01:00
o.winkels added the
Watchdog
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o.winkels commented 2022-11-21 12:57:46 +01:00
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Not possible because the fact that the GPIO can be controlled from soft-/firmware would mean that the latch can reset itself through the power-on-reset mechanism. A hardware power-on-reset (RC?) would therefore be required.

Not possible because the fact that the GPIO can be controlled from soft-/firmware would mean that the latch can reset itself through the power-on-reset mechanism. A hardware power-on-reset (RC?) would therefore be required.
o.winkels commented 2022-11-21 13:08:35 +01:00
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Embedded Watchdog + External RC PoR seems to be the most cost-effective solution.

Rule compliance is given because the watchdog toggle happens from software anyway, and the watchdog output only trips the latch, can't reset it. Reset is covered by PoR circuit.

Embedded Watchdog + [External RC PoR](https://www.onelectrontech.com/wp-content/uploads/2020/08/External-RC-Power-On-Reset-POR-circuit-with-Schottky-Diode-fast-discharging--768x637.jpg) seems to be the most cost-effective solution. Rule compliance is given because the watchdog toggle happens from software anyway, and the watchdog output only trips the latch, can't reset it. Reset is covered by PoR circuit.
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