no GND connection on ESP32 PICO D4 chip

dark99dark
Posts: 2
Joined: Wed May 15, 2019 12:18 pm

no GND connection on ESP32 PICO D4 chip

Postby dark99dark » Wed May 15, 2019 12:28 pm

Hi,

can someone explain me how is the GND (PIN 49) of ESP32 PICO D4 connected to the PCB board. I have checked the Gerber files (all layers), but there is no connection to GND.
Attachments
ESP-32-PICO-D4.png
ESP-32-PICO-D4.png (507.21 KiB) Viewed 200 times

mikemoy
Posts: 302
Joined: Fri Jan 12, 2018 9:10 pm

Re: no GND connection on ESP32 PICO D4 chip

Postby mikemoy » Wed May 15, 2019 1:16 pm

According to the data sheet you don't have to connect the GND pad to GND. It mainly for thermals than GND.
Though IMHO I would never not connect it to GND.

dark99dark
Posts: 2
Joined: Wed May 15, 2019 12:18 pm

Re: no GND connection on ESP32 PICO D4 chip

Postby dark99dark » Wed May 15, 2019 1:33 pm

Hi,

but this is strange, because on schematic I can only see one PIN which is connected to GND and its PIN 49.
So the question is, where is GND?
Attachments
schematic.png
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ESP_Sprite
Posts: 2719
Joined: Thu Nov 26, 2015 4:08 am

Re: no GND connection on ESP32 PICO D4 chip

Postby ESP_Sprite » Thu May 16, 2019 1:56 am

FWIW, pin 49 indeed is the only GND pad on the PicoD4 and as such must be connected. From what I remember, the remark that the middle pad is only a thermal pad is valid for the non-Pico ESP32s though.

dark99dark: You're looking at the layers, but you probably also should look at the drill files. There's an array of 9 plated vias connecting the bottom pad with the ground layer:
gerbv.png
gerbv.png (123.63 KiB) Viewed 166 times

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