AURIX™ Forum Discussions

[abhishek-2138]

For AURIX MCU we are considering Murata ceramic resonator & optional crystal resonator.

The 20 MHz Ceramic resonator is - Murata Crystal Resonator.

And the crystal oscillator is (supply voltage = 3.3V) - Crystal Oscillator.

Are the above parts are compatible with TC364 AURIX MCU ?

Vext supply = 5V. Also, we have 3.3V supply for Flash memory. 

Regards,

Abhishek D.

[MoD]

When you use Vext supply = 5V then the crystal oscillator must be also supplied with 5V. On TC3xx the XTAL pins are connected to VEXT (3,3V or 5V).

[abhishek-2138]

Yes, when the output of crystal oscillator is high, Vext = 5V will be connected to XTAL1 or XTAL2 pins.

So, is it needed to add series resistor with XTAL1/2 ?

The max current = 70uA as per datasheet above. So, series R = 5 / 70uA <= 71.42kohm.

Can you please comment on above?

Regards,

Abhishek D.

[dw]

Please refer to AP56002 AP32369 AP32214 for Crystal Oscillator Configuration and Basics.

In summary, while both quartz crystals and ceramic resonators are used as resonant circuits in electronic devices, quartz crystals are more accurate, stable, and temperature-resistant than ceramic resonators. However, ceramic resonators are less expensive and easier to manufacture. The choice of which to use will depend on the specific application and the required frequency accuracy and stability.