Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

Tellef Goderstad Sunne — Tue, 17 Sep 2019 12:21:11 GMT

Hi Marjeris,

Thank you for your answer. I use a 4-layer PCB but for now I have VDD planes in the internal layers, but I can chang at least one to GND.

Tellef

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

Marjeris Romero — Tue, 17 Sep 2019 12:12:52 GMT

Hi Tellef,

No problem doing this, but you need to have a internal ground plane between the two. So for 2-layer PCB it will not work, but 4-layers will be fine. You can send your files for review in a private ticket here in Devzone as well if you have any more questions.

EDIT: but you will have the same limitation as if the two chips where place right beside each other. You will not be able to receive while the other one is transmitting and same the other way withouth interferance.

Best regards,

Marjeris

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

awneil — Tue, 17 Sep 2019 08:54:13 GMT

https://devzone.nordicsemi.com/f/nordic-q-a/49460/synchronization-of-two-placed-closed-nrf52840

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

Tellef Goderstad Sunne — Tue, 17 Sep 2019 08:47:24 GMT

Yes, I do need both of them. I have orientated the chips so that the antennas are placed in opposite corners on the board.

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

awneil — Tue, 17 Sep 2019 08:36:06 GMT

But the nRF52 chips are not just microcontrollers: they a Systems-On-Chips - with a microcontroller plus a full radio system.

It's the radios that'll give you issues - so do you really need two radios ... ?

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

Tellef Goderstad Sunne — Tue, 17 Sep 2019 05:44:38 GMT

The project requires two microcontrollers

RE: Placing nRF52832 and nRF52840 on oposite sides of a four layer PCB

awneil — Mon, 16 Sep 2019 14:35:36 GMT

Why do you need both chips?