LPC55S69: crystal-less design

[EugeneHiihtaja]

Hello !

Do I understand right and MCU can be totally crystalless  ? And supports whole declared temperature range ?

PLL0 can use FRO_12MHz and generate 100 or 150 Mhz clocks without any problems.

SPi and I2C can use FRO_12Mhz for clocking ( SPI speed can be 10Mhz ?).

RTC can own FRO32KHz oscillator but it may be not so precise for keep calendar time.

Is this so ? How to calculate possible drift while 1 week ?

What can be problems if no any crystals is not in use ?

Regards,

Eugene

[FelipeGarcia · Accepted solution]

Hi Eugene,

LPC55S69 can be used without external crystal. However, you will not be able to use USB High-Speed without it and RTC will not be as accurate as using external crystal.

Have a great day,
Felipe

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