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no GND connection on ESP32 PICO D4 chip
Posted: Wed May 15, 2019 12:28 pm
by dark99dark
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.
Re: no GND connection on ESP32 PICO D4 chip
Posted: Wed May 15, 2019 1:16 pm
by mikemoy
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.
Re: no GND connection on ESP32 PICO D4 chip
Posted: Wed May 15, 2019 1:33 pm
by dark99dark
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?
Re: no GND connection on ESP32 PICO D4 chip
Posted: Thu May 16, 2019 1:56 am
by ESP_Sprite
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 (123.63 KiB) Viewed 3976 times