I use the SC16IS752IPW 16 times on a big PCB.
Since I made a new revision of the PCB the SC16IS752IPW allways looses its setting (makes a reset) after switching a relais near the chip. The astonishing thing is, that between the revision bevor and the actual one I din't change anything around the Relais or the SC16IS752IPW.
Measuring the souroundings of the chip I get a ripple at the 3.3V supply voltage (400mVpp for 1us) at the Reset input (1Vpp for 100ns) and at the I²S Data/Clock (1Vpp for 100ns) while switching the Reliais. Can this be the reason for the reset of the chip?