ESP32 / ESP-PSRAM64

[slawekbikeman]

Hi, I am building my own version of the Meshtastic module based on the Hydra schematic. PSRAM comes in two models, powered by 1.8V (ESP-PSRAM64) and 3.3V (ESP-PSRAM64H). The Hydra schematic has the ESP-PSRAM64 symbol. However, the power supply is connected to 3.3V. So I used the ESP-PSRAM64H circuit, as the specification requires it to be powered by 3.3V. Unfortunately, ESP32 does not work with the memory. It does not see it at all. Is the ESP-PSRAM64 symbol (1.8V) on the schematic correct and is that the reason it does not work? Or is the ESP-PSRAM64H (3.3V) circuit correct, but the problem may be somewhere else?

TIA

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Slawek Bikeman