TCAN1042G-Q1: Schematic review

Hi Kevin,

Here is my schematic review:

• Pinout on schematic matches pinout on datasheet: Correct, keep in mind that pin 5 is not a split pin on this device. If you are buying the TCAN1042 non-V this is a NC pin. It is not internally connected to the device. You can remove anything connected to split pin as it will not do anything.
• Decoupling on VCC: Not optimal, the datasheet recommends a bulk capacitance of 4.7 uF as well as the bypass capacitor of 0.1 uF. If you can I recommend placing a 4.7uF capacitor as close as you can to the VCC pin.
• The rest of the pins look correct

CAN Bus

• Termination Resistors included and valued well: Correct
• Split capacitor included and valued well :Correct
• CMC included and placed well: Correct
• Filter capacitors included and valued well: Correct, the biggest deciding factor for these capacitors will be how many nodes you have on the bus. You do not want to overload the bus or you may no longer be able to drive a dominant signal.
• TVS diodes: Not optimal, The TVS diodes are meant to short any transients to GND before they reach any of the components behind the TVS diodes. Right now the filter capacitors are in front of the TVS diodes and any significant transient could damage those caps. I would recommend moving your TVS diodes in front of your filter caps so that the entire CAN bus is protected.

Best,

Chris