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Original question:

ADS1299: Schematic review for 4 channel single ended measurement with ESP32

ADS1299: ADS1299 short circuiting

roavmf
Prodigy 140 points
Part Number: ADS1299


Tool/software:

Could you please help debug this schematic for connecting a single ended ADS1299 connected to a ESP32-pico for 4 channel EMG measurements? 

I have a PCB connected as shown in the diagram, but once powered, the ADS1299 somehow shorts the AVDD to the GND signal. I found somewhere that the nPWDN and the RESET pins need to be pulled up to DVDD via 10 kohm pull-ups, but as it was connected to the ESP32 GPIO directly, I programed the ESP32 to pull up the two pins at startup but wasn't able to fix it.

At an attempt to debug, I also cut off the nPWDN and RESET connections to the MCU to make them floating, but the ADS1299 still causes a short. If I unsolder the ADS1299 from the PCB there is no short circuit. Is there some issue in the connections above?

Thanks