TCAN1043HG-Q1: External schematic devices parameter calculations tools

Hi Beida,

Eric's reply is exactly we will recommend for all CAN applications using our chips, we do not design system or require a single component, thus we can only recommend the typical value, it is customer's willing to choose a specific value to meet their system's requirements.

For the split capacitor C6, refer to the 4.5.2 in this app note.

https://www.ti.com/lit/an/slla270/slla270.pdf

For the bus filters C2 and C7, it's simply used to filter out high frequency noise, different capacitors can handle different frequency ranges but typically low value caps filter high frequency and higher value caps filter lower frequency. Adding capacitive load will increase the rise/fall time so they need to pick a value that can work well in their system.

For the choke L1, refer to this app note.

https://www.ti.com/lit/an/slla271/slla271.pdf

 51uH - 100uH range is high enough to filter out common mode noise while being low enough to not heavily impact the CAN data itself or contribute negatively to transient behaviors through inductive kickback. This range is pretty standard throughout the industry. Our EMC test reports also use 100 uH.

Regards,

Sean