NRF52832 Schematic Review

[calibrexnick]

As the title suggests, I'd like some help reviewing my schematic for a 52832 pcb. I have tried to stay as close as possible to the DCDC reference design. 
Some notes on the uncommon parts:
- The STAT output on the battery charger is open drain or high Z
- The LED pin (LED data in) is not tied to the LED supply voltage
- All non-MCU supporting parts are moved over from a confirmed working design that was using an Espressif chip

[X4ce]

A Quick observation reveals that the schematic is missing caps C13 & C14 at P0.26 & P0.25, respectively, according to the reference design.

Moreover, check VCC LDO that it can still regulate after diode's forward voltage drop.

Further, your adc VDRs comprise high impedances that may not be of much concern.

Regards

Shahid

[calibrexnick]

Thanks! Do you know if C13 and C14 are critical for operation?

[Bendik Heiskel]

Hi,

C13 and C14 are only needed if you are planning on getting the device certified in Europe, as they are related to errata 138.

Since you are not using the pins, a easier fix is to just ground P0.25 and P0.26 directly, this will reduce the spurious emissions sufficiently.

 

Best regards,

Bendik

[calibrexnick]

Good to know, thanks. Another quick question: the ESR of my crystal is 150 max. I see this is pretty far out of tolerance - would this prevent BLE from working? I intend to swap these out but this board has already been spun and I'm not debugging