ESP32 Wrover B PCB Design

[Jay Vadoliya]

After Some problems in previous board I am designing new board with ESP32 Wrover B and i am using reference design of module but there are some questions that i want to ask before sending this design to PCB routing.

1.Why IO22 and IO21 is pulled up ?
2.Is there any other protection required in power supply of ESP32-Wrover(like Transient Surepression and Overvoltage)
3.Is it overkill to add 470uf Capacitor in power supply?
4.What are some important things to consider while PCB routing of module?

[ESP_Minatel]

Hi,

1.Why IO22 and IO21 is pulled up ?
2.Is there any other protection required in power supply of ESP32-Wrover(like Transient Surepression and Overvoltage)
3.Is it overkill to add 470uf Capacitor in power supply?
4.What are some important things to consider while PCB routing of module?

1 - Why did you pulled-up IO22 and IO21?
2 - It's on our Reference Design one TVS in the 3V3 supply.
3 - It depends on your power supply. For your design, I think it is, but I don't know about your power supply capabilities.
4 - You can see all reference design material from Espressif. You can follow all the best practices from this document.

[Jay Vadoliya]

We did working Prototype with LILYGO Board so for reference we used schematic of same board. In schematic of board IO21 & IO22 is pulled up.
5V power supply is taken From Industrial SMPS which can deliver 3 to 4 amps

schematic file is attached.

[ESP_Minatel]

If you take a look at the schematics, you will see that the IP5306-I2C is connected to the IO21 and IO22.

Screenshot from 2022-04-11 11-39-38.png (234.31 KiB) Viewed 2913 times

[Jay Vadoliya]

Thanks

what about 470uf capacitor i dont generally see this heavy capacitor on any board

[ESP_Minatel]

I see no advantage in using this large capacitor since you have a good power source.