topic Re: PCA9614 in Other NXP Products

PCA9614

sd23 — Thu, 16 Dec 2021 07:56:40 GMT

How do we determine termination resistor values for PCA9614?

guoweisun — Thu, 16 Dec 2021 08:01:51 GMT

The termination resistor determined by the VCCA/VCCB setting,what're value of them in your side?

sd23 — Thu, 16 Dec 2021 08:43:50 GMT

Both are 3.3V.

TomasVaverka — Thu, 16 Dec 2021 11:00:54 GMT

Hello Sedef,

I would recommend you to take a look at the AN847 which includes the calculations of proper bus termination resistors.

Best regards,

Tomas

sd23 — Thu, 16 Dec 2021 14:55:45 GMT

Thank you Thomas.

Mietto2 — Fri, 09 May 2025 10:49:46 GMT

Hi,

I have a similar application with Vdd=3.3V on both sides, and Z0=100R.

Going through the app note, two questions arised:

1) The app note mentions the FAILSAFE bias = 200mV. What is that value with the PCA9614?

2) The app note do not consider 3 resistors on both sides of the cable, while the PCA9614 asks for that. What is the impact?

Best regards.