Schematic for custom PCB

[Ehsan]

Hi,

I am designing a custom PCB using the nRF51422 chip. I have a program that I developed on the nRF51-DK. The program reads the capacitance value of a proximity sensor at one of the analogue input pins and then the RTT is used for display this value on a terminal program. I want to do the same with my custom PCB and the design I have is attached. Is this design sufficient for this function or do I need to make any alterations? Thanks.

Schematic.PNG

[bjorn-spockeli]

Hi Ehsan,

You're missing several mandatory components like the 16MHz crystal, the DEC2 capacitor(C10) and the C9 capacitor between VSS and AVDD. Furthermore, adding a pulldown resistor to the SWCLK line is not a very good idea.

You should copy the reference circuitry in the nRF51422 Product Specification, found here. You will find the referance circuitry in Section 11: Reference Circuitry.

Bjørn

[Ehsan]

Hi,

I have redesigned my schematic to match the reference layout. I have attached the design in my original question. I am not planning on using the ANT system and hence, I have not included it. Do I still need to connect a capacitor to the VDD_PA pin? I would be grateful if you could let me know if my design is correct. Thanks.