nRF52832 :- How many external components(capacitors, crystals, etc.) required for Proximity Tag profile?

[vmageshkumar]

I am planning to use nRF52832 SoC for proximity tag so I want to understand how many external components required for this profile.

You have any reference design for proximity tag using nRF52832?

[MartinBL]

Hi. Have a look at these Reference Layouts. We don't have any reference designs specific for proximity tags, but I guess you don't need much more than the minimum parts to drive the nRF52 and maybe a battery holder and a voltage regulator.

EDIT:

I will refer to the reference layout nrf52832_qfaa_schematic.pdf:

First, whenever you are using the radio you will need the external 32MHz crystal, X1, and the two capacitors, C1 and C2. This crystal is needed to provide an accurate clock to your radio. You will also need the capacitor and inductor, C3 and L1, to use the radio.

Second, decoupling the nRF52 is important as it is susceptible to noise and surrounded with high frequency signals (e.g. clocks and radio). Therefore I can not recommend omitting some of the decoupling capacitors, C5, C9 and C8. The capacitors C4 and C10, connected to DEC1 and DEC2, are decoupling the nRF52's internal voltage regulators.

Finally, as noted in the reference layout, the low frequency clock, X2, with its two capacitors, is optional. Instead you can use the internal low frequency RC oscillator or synthesize a clock from the 16MHz clock. This will, however, impact your current consumption. Read more about choosing clock sources here What low-frequency clock sources can I use? and here How to minimize current consumption for BLE application on nRF51822.

[vmageshkumar]

Thanks for your quick response. Wether we need all the components which is mentioned in the reference design or can we reduce couple of components based on the usage from the refernce design?

For Proximity tag profile, I must be ustilising only 3 GPIO's(Buzzer,button, Led) so whether there is any possiblity to reduce the no. of components further?

[Michael Dietz]

None of the external components included in the reference design schematics/layouts have anything to do with GPIO pins so the fact that you are only using 3 GPIOs wont reduce the number of external components required.