TCAN4551-Q1: SCH review

Hi Jingguo,

I have reviewed the schematic and I have the following comments.

If a single-ended clock is used on the OSC1 pin instead of a crystal, the OSC2 pin will need to be connected to GND.  I would suggest adding a 0-ohm resistor to GND option on OSC2 pin that would allow OSC2 pin to be "Grounded" when the single-ended clock is used.

I would also recommend placing a 0-ohm resistor between the OSC1 pin and the Crystal that can used to isolate the crystal from the single-ended clock so that it does not try to start oscillating when the single-ended clock is used.  This resistor will also be needed when optimizing the crystal circuit when the crystal is used instead of a single-ended clock.

Please review the TCAN455x Clock Optimization and Design Guidelines Application Note (Link).

The FLTR pin requires a minimum capacitance of 300nF to ensure stability of LDO used to run the digital core.  A 330nF capacitor is commonly used on the FLTR pin instead of the 100nF shown in the schematic.

The nINT pin is an open-drain pin that requires an external pull-up resistor to VIO.

Regards,

Jonathan