Schematic for custom PCB

RE: Schematic for custom PCB

bjorn-spockeli — Thu, 20 Jul 2017 13:26:43 GMT

If you plan on using the nRF51422 for BLE then you need to add all the components connected to ANT1, ANT2 and VDD_PA.

RE: Schematic for custom PCB

Ehsan — Thu, 20 Jul 2017 13:23:10 GMT

I am planning on using the bluetooth capacibities of the chip later on. I won't be using the ANT protocol or any other radio comms. Do I need the VDD_PA pin connection?

RE: Schematic for custom PCB

bjorn-spockeli — Thu, 20 Jul 2017 13:20:14 GMT

Do you mean that you are not going to use the Radio on the nRF51 at all? Or do you mean that you're not going to use the ANT protocol support? If that is the case then you should go for the nRF51822 which only support BLE.

RE: Schematic for custom PCB

Ehsan — Thu, 20 Jul 2017 12:30:01 GMT

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.

RE: Schematic for custom PCB

bjorn-spockeli — Thu, 20 Jul 2017 09:24:12 GMT

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