Ble connection drops out on button press

RE: Ble connection drops out on button press

Susheel Nuguru — Tue, 10 Jul 2018 05:59:00 GMT

[quote user="ilkobg"]The software is working fine. I suspect that the antenna should be retuned by the T-network[/quote]

lliev, Did you see any better results after the retuning?

RE: Ble connection drops out on button press

ilkobg — Mon, 09 Jul 2018 13:10:11 GMT

The software is working fine. I suspect that the antenna should be retuned by the T-network, because of the plastic enclosure. According to Section 11.2 (page 22) of the following document by Cypress, putting the pcb in a plastic enclosure cause a shift in the resonant frequency.

Antenna Design and RF Layout Guidelines

To sum up, the following details should be taken into consideration:

This behaviour is caused when the pcb is inside the device body.
This behaviour is caused only by 2 of 4 buttons on the pcb.
We have only one pcb from the production series (25 pcbs in total) that is working properly and don't have any issues.

RE: Ble connection drops out on button press

Susheel Nuguru — Wed, 27 Jun 2018 06:54:43 GMT

have you verified to see if this is a software bug? an Hardfault exception could also cause this behaviour

RE: Ble connection drops out on button press

ilkobg — Mon, 25 Jun 2018 10:19:27 GMT

I powered a new pcb from a stable 3.3V source. The problem is still present, nothing changed.

RE: Ble connection drops out on button press

Susheel Nuguru — Mon, 25 Jun 2018 09:40:47 GMT

Hi,

My colleague reviewed your schematics and wants to clarify that the board is powered from 3.7 LiPo batter, which is connected to J3 and J5, which go directly to the chip This os out of specification. Can you test with a stable, external power supply and never connect the LiPO directly?