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LPC55S69: crystal-less design

Question asked by Eugene Hiihtaja on Nov 21, 2019
Latest reply on Nov 25, 2019 by Felipe García

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 ?