Other NXP ProductsのトピックRe: SC16IS741A with a different crystal from example.

SC16IS741A with a different crystal from example.

guillep2k — Mon, 31 Oct 2016 18:05:56 GMT

I'd like to use SC16IS741A with an SMD crystal (i.e., not 1.8432 MHz); something like ABLS-LR-3.072MHZ-T (18pF load capacitance) or smaller.

If possible, what values should I use for C1/C2 which should be 0805 on a 2-layer PCB?

Re: SC16IS741A with a different crystal from example.

TomasVaverka — Wed, 02 Nov 2016 08:21:30 GMT

Hi Guillermo,

Yes, you can use the the 3.072 MHz or smaller crystal and the C1/C2 value are 22/33 pF.

Best regards,

Tomas

Re: SC16IS741A with a different crystal from example.

guillep2k — Wed, 02 Nov 2016 12:18:22 GMT

Thank you, Tomas; I see I can still use the capacitor values given for the 1.8432 MHZ crystal. Is there a range of crystal frequencies I could use? Like 11.0592 MHz or others, in case I need further miniaturization of my design? How can I calculate the right capacitors in those cases?

Kind regards,

Guillermo

Re: SC16IS741A with a different crystal from example.

TomasVaverka — Mon, 07 Nov 2016 08:39:28 GMT

Hi Guillermo,

The datasheet specifies the crystal oscillator max. 24 MHz and it is okay to use both C1/C2 as 22/33 pF.

Best regards,

Tomas