Migrating nRF52840 to nRF52833

RE: Migrating nRF52840 to nRF52833

Marjeris Romero — Fri, 18 Feb 2022 16:30:30 GMT

Sorry for the late reply. If you are referring to the N.C capacitor C13 connected to DEC2 pin in the nRF52840 aQFN73 reference design, it was laid out in case of any issues or something else required an extra decoupling, but it was rarely never needed, so it is up to you if you want to keep it in your design or not. In the nRF52833 the same pin (A18) should be kept N.C.

If you want a closer review of your design please feel free to open a private Devzone ticket and we will give you a more in-depth review.

Best regards,

Marjeris

RE: Migrating nRF52840 to nRF52833

chethans — Wed, 09 Feb 2022 14:55:44 GMT

Marjeris Romero One more change from 52840 to 52833 is the additional NC cap on DEC2 pin. Currently we do not have this cap due to space constraints. Is there any scenario where this would be required?

RE: Migrating nRF52840 to nRF52833

chethans — Tue, 25 Aug 2020 05:58:33 GMT

NRF52833 has higher operating temperature, up to 105 deg

RE: Migrating nRF52840 to nRF52833

Bill Choi — Mon, 24 Aug 2020 15:45:44 GMT

Can I ask why you are migrating from nRF52840 to nRF52833 ?

RE: Migrating nRF52840 to nRF52833

Marjeris Romero — Fri, 07 Feb 2020 12:02:33 GMT

Hi,

Please refer to the PS for both the nRF52840 and nRF52833 in our infocenter.

RE: Migrating nRF52840 to nRF52833

Anarchira — Fri, 24 Jan 2020 18:39:33 GMT

are there documentation for which pins and configs are different?

Thanks.

RE: Migrating nRF52840 to nRF52833

Marjeris Romero — Tue, 07 Jan 2020 12:16:28 GMT

Hi,

It shouldn't be too complicated to migrate from one chip to the other, it would be only a matter of changing the target board in preprocessor definitions, board config and some GPIO pins may need remapping.

BR,

Marjeris

RE: Migrating nRF52840 to nRF52833

Joel — Sat, 28 Dec 2019 14:50:18 GMT

Hi msromero. I'm in the same boat. I have nrf52840 to be used for first few K production units and then will be switching to nRF52833. Software code wise is there any migration documentation made by nordic semi? Or is it as simple as changing target processor in config? Please advise. Thnx

RE: Migrating nRF52840 to nRF52833

Marjeris Romero — Wed, 04 Dec 2019 13:48:07 GMT

They are pin compatible but not "drop-in" pin compatible. In the pin assigment table for both chips you'll see that some pins are N.C. in the nRF52833 compared to the nRF52840, and also some of the IO pins names are different so they will need application-level remapping.

Best regards,

Marjeris

RE: Migrating nRF52840 to nRF52833

chethans — Wed, 04 Dec 2019 12:19:49 GMT

Except for the ANT circuit and extra L2 for NRF52833, they are pin compatible according to the reference schematics provided. Am I missing anything else here?

RE: Migrating nRF52840 to nRF52833

Marjeris Romero — Wed, 04 Dec 2019 12:14:09 GMT

Hi chethans,

Yes you can. The matching network in the reference design for 52833 will be the best alternative for your schematics, as it works best when using +8dBm as TX power for both 52833 and 52840.

Keep in mind that although the nRF52833 has the same footprint as the nRF52840, they are not "drop-in" pin compatible, so take a close look to the pin assigment for both chips when developing both hardware and software compatible for both chips.

Best regards,

Marjeris

RE: Migrating nRF52840 to nRF52833

chethans — Tue, 03 Dec 2019 07:34:42 GMT

Hi,

I have similar question. Can we make NRF52833 schematic compatible with NRF52840 by adding a 0 ohm placeholder resistor at L2? Does it affect antenna performance?

We will be using a wire antenna connected via UFL connector.

Since NRF52833 is not available yet, we want to first production with NRF52840 and then move to NRF52833 without changing PCB design.

RE: Migrating nRF52840 to nRF52833

Marjeris Romero — Mon, 04 Nov 2019 13:36:00 GMT

Hi Maximiliano,

It will depend. You will have to measure the RF TX harmonics and tune the RF matching network if needed. If you want you can send us at least 2 PCBs with the nRF52833 and we can help you with the tuning.

Best regards,

Marjeris