nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

AlanH — Fri, 12 Feb 2021 20:46:03 GMT

Wouldn't connecting to VDD_PA potentially introduce parasitics that could throw off the matching / balun circuit?

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

RPi23 — Wed, 10 Feb 2021 04:31:17 GMT

Hi, what would be the status of VDD_PA when CSN is high (Power Down mode)? Will it be LOW or Floating/High Impedance?

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Fadi Bunni — Wed, 25 Sep 2019 03:54:18 GMT

Yes 🙂

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

HenryTR — Wed, 25 Sep 2019 03:53:10 GMT

Thanks! I had a question regarding how the RFX2401C module switches between TX and RX. It looks to me like since RX is logic high, it will be in receive mode; unless TX is also logic high. So NRF24L01 only raises VCC_PA high when it is transmitting.

Is my understanding correct?

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Fadi Bunni — Thu, 05 Sep 2019 02:13:56 GMT

Here is the newest schematics, tested and it works :)

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

HenryTR — Thu, 05 Sep 2019 02:07:41 GMT

Hello,

I see a potential concern, regarding the 0.3pF capactior between the RFX2401C ANT pin and the 24508P1400100 IN pin. I think this should be tied to GND according to the RFX2401C datasheet page 7. It is my understanding that this cap is thesame as the C3 cap in Figure 3.

Is this schematic up to date with the design that you built and tested?

I am curious since I am currently designing a PCB for a remote control car.

-Henry

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Mehdi Mohammadpour — Thu, 20 Jun 2019 21:54:08 GMT

Hello
firstly, pardon my bad English. my native language is not English.

you really gain to 2300 meters? fantastic. can you please guide me to follow your path to be able design such a wonderful transceiver?

can you please send me schematic of your circuit?

can you please send me your documentation to my email? my email is "mr.mohammadpour[atcomehere]gmail.com"
best regards : Mehdi

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Fadi Bunni — Wed, 29 May 2019 12:21:33 GMT

Hello, i have build it and tested it, and it works perfectly, up to 2300 meters as of now, going to test with a high gain antenna, and hopefully reach 5-7km rage :)

Thanks for your help.

Regards
Fadi

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Fadi Bunni — Wed, 29 May 2019 11:12:21 GMT

Hello, I can confirm it works fine. I have tested in with a range up to 2300 meters, it can probably go twice the distance, once i have solved some software problems :)

I am just curious, what are you going to use it for?

If you need any help, you can contact me on my mail: fadibunni1994@gmail.com

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

KAMEN — Wed, 29 May 2019 11:06:09 GMT

hello,

while i was searching for nrf24 with pa lna schematics i found this thread. i was wondering if the schematic worked out for you in the end

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Kenneth — Sun, 03 Feb 2019 14:10:07 GMT

A common ground plane is typically the safest option, since ground currents can be hard to control if you start splitting ground planes.

On a 4-layer pcb, make sure inner layers have cut-out on inner layers for the radio matching network, as the radio matching layout (circuitry connected to ANT1/2 and VDD_PA) has been designed for a 2-layer board. I suggest you create a new case for a proper review once you have made a layout.

Best regards,
Kenneth

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Fadi Bunni — Thu, 31 Jan 2019 00:16:58 GMT

Nice, just what I wanted to hear, saves me some pins and programming time. 1.8V is good the PA needs >1.2V. So no problem.

Now that I have you. I have a question about grounding multiple transceivers, on one PCB with the following 4 layers: RF/signal, Ground, VDD, Signal. How should the grounding be for 4 transceivers? A star type of typology, where each transceiver is connected to their own groundplane which in turn is connected to a common groundplane (where the MCU is also connected) or should all transceivers be connected to the same groundplane.

Thank you for your valuable time.

Regards
Fadi Bunni

RE: nRF24l01+ 2450BM14A0002 + RFX2401C + 2450BP14D0100. Using VDD_PA pin for controlling PA/LNA.

Kenneth — Wed, 30 Jan 2019 12:26:53 GMT

Hi,

A long long time ago (in a galaxy not so far), we did a prototype board that show how it can be possible to connect a PA to the nRF24L01. You can find it attached, page 1 must always follow reference layout, page 2 depends on your PA design, maybe you can use it as reference. The VDD_PA pin will go high during transmission (start ~50us prior), and low during reception (and idle). Please be aware that the VDD_PA high is 1.8V (not VDD).

Best regards,
Kenneth

devzone.nordicsemi.com/.../nRF24L01-and-SE2425U_5F00_schematics.pdf