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Original question:
Hi,
we are facing noise issues with TLK106LRHBT. Basically the PHY module has a reset when a varying electrical field is applied close < 1.5 mm the IC package. The electric field is caused by the switching node (PWM at ~ 48 V) of a motor controller phases cable at around 20 kHz frequency.
When the phases are physically close to the IC it resets and EtherNet communication stops. The link LED shuts down. Once the distance increase, it restarts and work correctly. No error log is readable from TwinCat. Pins 1 to 8 are the ones closest to the noise generating power phase. Adding a thin aluminum foil connected to the PHY GND on TOP of the package VQFN-32 has solved the problem. However we would prefer avoiding this solution. Placing the cables far away is also difficult as it is a very small and compact device.
What is the electrical field immunity of the device? Do you think the noise is coupled to some of the pins (1 to 8)? The reset pin is the most distant from the noise source. Any advice or recommendation would be greatly appreciated!
Thanks,
Ernest
Hi Ross,
we tried using the DP83822 and it did not solve the issue. The problem still appears.
Please see the layout near the PHYs. Hope you understand there are several layers and ground planes and I tried to make them transparent. For IP issues I can't send more files.
Looking forward to your feedback.
