Timeline for How to create a power latching circuit without to exceed the GPIO specifications of an battery driven esp32 for a zero current power consumption
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Nov 8, 2023 at 0:26 | comment | added | playmobox | @Justme could you please confirm my new solution? | |
| Nov 7, 2023 at 18:04 | history | edited | playmobox | CC BY-SA 4.0 | edited body |
| Nov 7, 2023 at 17:54 | history | edited | playmobox | CC BY-SA 4.0 | added 290 characters in body |
| Nov 7, 2023 at 11:08 | comment | added | Justme | The problem is, when you want to turn the circuit on, the MCU is unpowered. Then you give it 3.3V to IO pin while it is unpowered. Then power supplies turn on and MCU is powered. Same when turning the circuit off. When you push the button, there is 3.3V on IO pin. 3.3V supply turns off. Now there is stll 3.3V on IO pin because you are still pushing the button while MCU no longer has supply. | |
| Nov 7, 2023 at 11:01 | comment | added | Justme | OK, so in that case, the problem only happens when MCU is unpowered and you push the button. Which also means problems when turning MCU on and turning the MCU off. | |
| Nov 7, 2023 at 10:54 | comment | added | playmobox | No, power ist reaching the MCU just if the button is pressed. | |
| Nov 6, 2023 at 21:55 | comment | added | Justme | Yes, it's wrong. If the MCU 3.3V is turned off, but you have 3.3V from button on a GPIO pin of unpowered MCU, it may push power through IO protection diodes to MCU supply and it will be on. It may also damage thr MCU. | |
| Nov 6, 2023 at 21:39 | history | answered | playmobox | CC BY-SA 4.0 |