ESP32-WROOM-32D Ground Plane PCB vs. Schematic

westmarkm
Posts: 2
Joined: Sun Mar 22, 2020 4:43 pm

ESP32-WROOM-32D Ground Plane PCB vs. Schematic

Postby westmarkm » Sun Mar 22, 2020 4:54 pm

According to Figure 8 (Recommended PCB Land Pattern of ESP32-WROOM-32D) of the ESP32-WROOM-32D datasheet, the ground plane on the bottom of the module consists of nine SMD pads that are each 1.33 mm x 1.33 mm in size. However, Figure 5 (ESP32-WROOM-32D & ESP32-WROOM-32U Peripheral Schematics) of the same datasheet shows a schematic with a single pin (P_GND). This results in a mismatch between my PCB design (9 pads) and schematic (1 pin), which cannot be connected.

Please let me know the correct PCB and schematic configuration for this situation. Thanks in advance.

Regards, Mark

WiFive
Posts: 2952
Joined: Tue Dec 01, 2015 7:35 am

Re: ESP32-WROOM-32D Ground Plane PCB vs. Schematic

Postby WiFive » Mon Mar 23, 2020 9:09 am

The ground pad on the module is a single pad but the recommended ground plane on the host pcb is the divided pad with vias. I think this is for thermal considerations and to prevent solder wicking or pooling.

ESP_Sprite
Posts: 3746
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-WROOM-32D Ground Plane PCB vs. Schematic

Postby ESP_Sprite » Mon Mar 23, 2020 5:33 pm

Additionally, at least most PCB programs I used see pads that have the same pin number as one pad; perhaps you can use that.

westmarkm
Posts: 2
Joined: Sun Mar 22, 2020 4:43 pm

Re: ESP32-WROOM-32D Ground Plane PCB vs. Schematic

Postby westmarkm » Wed Mar 25, 2020 9:53 pm

ESP_Sprite wrote:
Mon Mar 23, 2020 5:33 pm
Additionally, at least most PCB programs I used see pads that have the same pin number as one pad; perhaps you can use that.
I am using Eagle. That should be doable. I will give it a go. Thanks for your time and assistance.

Regards, Mark

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