N52832-CIAA don't work

[alex]

hi!

I use the reference design of  nrf52832_ciaa.IntLib ,but it didn't work

I use the internal-LDO ,but i measure the voltage of DEC4, it's 2.5V(not 1.3V), the VDD is 2.9V

which reason can cause the DEC4 to 2.5V?

[haakonsh]

Can you share the layout as well? 

[alex]

thanks ! i made a big mistake in layout, and i'll take your advise to improve it.

thanks again!

[haakonsh]

Send it to us for review before you print it next time :P

[alex]

N52832.zip

Here is my new files, thanks for review.

there is no place for the antennas impedance matching network , my application is just for advertising within 10 meters, maybe it can work as requested, I need your opinion.

[haakonsh]

Hey Alex,

It should be able to reach 10 meters, but I cannot guarantee that it will. This is a vast improvement on the previous design, even without the antennas matching network. 

Do note that you're missing the 4.7µF capacitor on VDD (pin A7). If this is a break-out/module intended to be soldered onto another board whos has such a capacitor already in its power supply then you're good. The function of the 4.7µF capacitor is to prevent voltage dips on VDD when the nRF consumes peak current. 

It will be a gamble, but i think you should print up a few boards, populate them, and send them to me. I will measure the harmonics of the radio and the impedance of the antenna, and then we will have some data on the performance of this design.