how to operate nrf8002 smd chip as standalone?

RE: how to operate nrf8002 smd chip as standalone?

awneil — Thu, 31 Mar 2016 21:02:09 GMT

You really need to get a dev kit, or use a module which will have all this stuff done properly for you.

RF design & layout is a specialist subject!

RE: how to operate nrf8002 smd chip as standalone?

FormerMember — Thu, 31 Mar 2016 11:05:20 GMT

Yes, long wires result in too much loss.

Yes, you will have to use a PCB to make it work properly. For the components in the matching network for matching the chip to 50 Ohm, the components on ANT1/ANT2 in the reference layout, not only the component value matter, but also the distance between the components and the relative geometry between the components. The purpose of the matching network is to damp harmonics and RX LO and match the chip to 50 Ohm, while keeping the output power as good as possible.

In general in RF, a transmission line of 1 mm is equivalent to a 1 nH inductor.

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Thu, 31 Mar 2016 09:15:40 GMT

Inductors do operate at that frequency.
I completely understaood what you said. Do you mean that because of jumper wires there can be noise, signal loss & impedance mismatch in RF circuit. Do only PCB can give optimum performance?

RE: how to operate nrf8002 smd chip as standalone?

FormerMember — Thu, 31 Mar 2016 08:34:43 GMT

I have updated my answer.

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Thu, 31 Mar 2016 08:09:40 GMT

Check now, This is how we are using Breakout. The Blue wire in center is our antenna. currently Inductors in nH range are unavailable here. Hence, we are using 1uH inductors instead.

RE: how to operate nrf8002 smd chip as standalone?

FormerMember — Thu, 31 Mar 2016 07:55:38 GMT

Okay, I see. How is the antenna connected? Could you upload a picture showing the nRF8002 connected on the breakout board?

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Thu, 31 Mar 2016 07:49:39 GMT

We are using BLE breakout with Breadboard. We are not using full PCB as of now.

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Thu, 31 Mar 2016 07:49:04 GMT

We are testing BLE breakout with Breadboard. We are not using full PCb as of now.

RE: how to operate nrf8002 smd chip as standalone?

FormerMember — Thu, 31 Mar 2016 07:37:22 GMT

Could you upload the layout as well? The layout is also very important the performance.

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Wed, 30 Mar 2016 14:05:24 GMT

Check now.. I uploaded schematics in question

RE: how to operate nrf8002 smd chip as standalone?

FormerMember — Wed, 30 Mar 2016 13:58:37 GMT

Could you upload your layout and schematic?

Update 31.03.16:

The reason that you don't get any range is because of the "layout".

The inductors that you use, how is their specification at 2.4 GHz? Are they made to operate at that frequency?
The antenna: In RF, things work differently than in "regular" electronics, due to high frequencies (and short wavelengths). One of the resulting effects is that the phase of a signal will vary along the transmissions lines, as opposed to low frequencies where the wavelengths >> transmission lines, and this effect can be disregarded. When the antenna is connected to the chip via a wire, this will result in a lot of loss and no range. If you need to connect the antenna through a longer wire, it should be done using a 50 Ohm transmission line.

Instead of using the nRF8002, you can consider to use the nRF51822 or the nRF52832, and do development with the respective development kits, nRF51-DK or nRF52-DK. nRF51822 and nRF52832 are much more flexible than the nRF8002.

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Tue, 29 Mar 2016 10:40:10 GMT

On serial Monitor BLE is responding with following message:

F00001 L00315

Please configure

S00001

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Tue, 29 Mar 2016 10:27:33 GMT

Yeah dats what. Configuration from nrfgostudio is happening without errors. But BLE is undiscoverable in bluetooth scanning. So, can you go through my question again & help me out?

RE: how to operate nrf8002 smd chip as standalone?

awneil — Tue, 29 Mar 2016 10:22:54 GMT

Sorry, I was thinking of nRF8001.

Yes, it looks like downloading the configuration from nRFgo Studio should set it going ...

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Tue, 29 Mar 2016 10:11:56 GMT

When you power upmit for first time, if thers no configuration istalled then it will fall into direct test mode. We can upload services configurations by nrfgostudio. Baudrate for UART interface is 19200. Nrfgostudio works on UART connection.

RE: how to operate nrf8002 smd chip as standalone?

awneil — Tue, 29 Mar 2016 09:48:17 GMT

Have you studied the nRF8002 datasheet? What does it tell you?

RE: how to operate nrf8002 smd chip as standalone?

mitul desai — Tue, 29 Mar 2016 09:12:17 GMT

I know. We are using Teensy3.2 board. Before interface with teensy for testing purpose I connected nrf8002 with FTDI cable for nrfgostudio applications.Between teensy & nrf8002, we can make UART interface. So is it that, BLE will be discoverable only after connection with microcontroller?

RE: how to operate nrf8002 smd chip as standalone?

awneil — Tue, 29 Mar 2016 08:57:44 GMT

If you feel that your previous question is now resolved:

devzone.nordicsemi.com/.../

please accept the answer and mark it as closed.

RE: how to operate nrf8002 smd chip as standalone?

awneil — Tue, 29 Mar 2016 08:55:36 GMT

Note that the nRF8002 is, effectively, just a modem - you need an external microcontroller - or "host" - to control it.

That's what the ACI is all about ...