CY8C4247LQI-BL483 - Problems getting 24 MHz oscillator to start/run

jricher_3587386 Jul 19, 2018 10:32 AM

I have a PSoC4-BLE device on a custom board. The device programs and the IMO and 32.768KHz oscillator spin up fine. The 24MHz oscillator does not start and does not run. Has anyone else run into a similar problem? The power supplies look good as far as I can tell, and the rails are thoroughly bypassed.

1. Re: CY8C4247LQI-BL483 - Problems getting 24 MHz oscillator to start/run

psyu Jul 20, 2018 1:46 AM (in response to jricher_3587386)

Hello Jacques Richer,

Please share the Schematic of your custom board.

Thanks,
PSYU.
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2. Re: CY8C4247LQI-BL483 - Problems getting 24 MHz oscillator to start/run

psyu Aug 14, 2018 4:41 AM (in response to jricher_3587386)

Hello,

Please refer the Clocking System section in the attached PSoC4 BLE Architecture TRM datasheet.

Thanks,
PSYU.
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3. Re: CY8C4247LQI-BL483 - Problems getting 24 MHz oscillator to start/run

odissey1 Aug 14, 2018 7:11 AM (in response to jricher_3587386)

jricher,
Try different bypass capacitor value for XTAL (10-24pf).
/odissey1
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