Regarding external oscillator for PSOC 4 BLE

[manu_ks]

Hello,

I am using the CY8c4247LQI-BL473  IC for my project. My requirement is to create a custom PCB using the IC and communicate with a mobile application over BLE.  I have written the code and tested with a PSOC 4 pioneer kit, and it is working fine. But when i use my custom PCB, nothing is being advertised.

I have currently not used any external oscillators. Is an external oscillator mandatory for the BLE subsystem to work?. Also I am using a wired antenna of length approximately 7-8 cm.  Will antenna tuning be required even for the advertisement to be read by the CySmart app?.

Thanks in advance.

Manu

[ncbs · Accepted solution]

Hi @manu_ks,

The datasheet mentions that ECO (external crystal oscillator) is required for the BLE subsystem (https://www.cypress.com/file/416486/download)

Regards,
Nikhil

[manu_ks]

Thanks a lot for clarifying @ncbs