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Reg. EMC issue with I2C communication

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umesh49

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Hi,
I had designed a product and was testing it. By fortune or misfortune I made my test setup near a wall (30cm Thicness) on the other side of which was some high intensity sodium bulb were there. When I started testing my I2C communication was showing some error. I made the bulbs "off" and there was no problem on board. So I am clearly able to replicate the problem by switching the bulb ON/OFF and when ever these bulbs are ON my I2C communication is geting Bad.
I am a new person to this mysterious world of EMI/EMC issue. It will be great help if anybody could suggest me how I can approach this issue from hardware design point of view.

Umesh.
 

How many layers has your PCB, has it a contigous ground plane, how are the SDA SCA lines routed, especially the clock line.
 

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