CC8520: Our company recently made CC8520+CC2590 wireless earphones, but found that the effect is not very good.

weiby

Part Number: CC8520
Other Parts Discussed in Thread: CC2590

The wireless communication distance is about 8m, and the sound will be intermittent if someone stands in the middle. Hope to get your help, thank you.Is there a problem with software?

over 2 years ago

0 weiby over 2 years ago

Prodigy 20 points

0 Ryan Brown1 over 2 years ago in reply to weiby

TI__Guru**** 207047 points

Hello,

Did you reference the CC85XX-CC2590EM-RD hardware to make this design and what default PUREPATH-WL-CFG settings are being used?

Regards,
Ryan

0 weiby over 2 years ago in reply to Ryan Brown1

Prodigy 20 points

HI,Ryan.

I designed it according to the guidance document, but the effect was not ideal, and I felt very anxious. I can send you the whole data (including hardware and software). Could you please help me have a look? Thank you very much for your help!

0 desouza over 2 years ago in reply to weiby

TI__Guru**** 168884 points

Hi,

I am unsure what you expected from your design; if you are comparing the maximum distance of your design and our reference designs, this can certainly isolate the issue to the HW of your board. In case both designs are having the same performance, the maximum distance across two wireless nodes requires that several aspects must be taken into consideration (the Real world range testing using CC85xx app note covers this subject). Not only the distance itself but also the type and size of obstacles, noise floor and interference levels, reflections or multipath attenuations in case of enclosed spaces, etc. That is one of the reasons why we cannot make a general statement about the maximum distance of our devices and development boards.

In addition to that, the HW and SW aspects also matter. If your HW is performing differently than our CC85XX-CC2590EM-RD reference design, the use of a chip antenna will yield a different irradiated power when compared to the inverted F antenna of our reference design. You would need to perform calculations and tests for antenna matching (the Antenna Selection Guide app note can help). We also recommend having a SMA connector to perform conducted measurements and properly evaluate the RF performance, harmonics, etc. For SW, the wireless bitrate and the audio bit depth will influence the ability to transmit to longer distances - in general, the lower the bitrate and the bit depth will allow reliable links to longer distances.

There are a few threads that go through some of these measurements that may help you further debug the root cause of this issue, which might help your scenario.

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/702879/cc85xx-cc2590em-rd-sensitivity-test-issue

https://e2e.ti.com/support/wireless-connectivity/other-wireless-group/other-wireless/f/other-wireless-technologies-forum/821809/cc8520-cc8520-cc2590-wireless-outdoor-distance-issue

Hope this helps,

Rafael

0 weiby over 2 years ago in reply to desouza

Prodigy 20 points

Thank you very much for your answer. I would like to ask whether the impedance from CC2590 to the antenna is the same as described in the picture

0 desouza over 2 years ago in reply to weiby

TI__Guru**** 168884 points

Hi,

I can't possibly know that with the images published. I strongly suggest to use a microstrip calculator and use both the physical dimensions and the board stackup to calculate the impedance of the RF path. This calculator can be found online (search for "microstrip impedance calculator") and one suggestion is mentioned in section 4.9 of our CC13xx/CC26xx Hardware Configuration and PCB Design Considerations application note.

Regards,

Rafael

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CC8520: Our company recently made CC8520+CC2590 wireless earphones, but found that the effect is not very good.