I'd like to interface the ESP32 with an lcd that runs at slightly lower voltages. The LCD has a recommended voltage of 2.8V with an upper limit of 3.3V.
From the esp32 datasheet it seems that going under 3.0V has issues with the flash. Would a voltage of say 3.1V or 3.2V be sufficient and stable?
ESP32 at lower voltages
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ESP_Minatel
- Posts: 364
- Joined: Mon Jan 04, 2021 2:06 pm
Re: ESP32 at lower voltages
Hi,
It depends on your chip version.
According to the datasheet, you can supply the ESP32 from 2V3 up to 3V6, but if you have the SoC version with embedded flash, the safe zone is about 3V0.
You have two options:
First option: Adding a second LDO to 2V8 for the LCD and keep the ESP32 with 3V3.
Second: Use a 3V0 or 3V1 LDO with at least 500mA for all. Most of the LDO you can find different voltages with the same pinout.
The question regarding stability is more relative to the current. Be sure to add a good quality LDO or buck converter that supplies enough current to your circuit.
It depends on your chip version.
According to the datasheet, you can supply the ESP32 from 2V3 up to 3V6, but if you have the SoC version with embedded flash, the safe zone is about 3V0.
- Screenshot from 2021-08-11 12-26-20.png (131.11 KiB) Viewed 3370 times
First option: Adding a second LDO to 2V8 for the LCD and keep the ESP32 with 3V3.
Second: Use a 3V0 or 3V1 LDO with at least 500mA for all. Most of the LDO you can find different voltages with the same pinout.
The question regarding stability is more relative to the current. Be sure to add a good quality LDO or buck converter that supplies enough current to your circuit.
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