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ADUM4160 VDDx & VBUSx connections

Question asked by yu-li on Sep 18, 2017
Latest reply on Sep 18, 2017 by MSCantrell


Upstream data lines connect to a microprocessor that acts a HS USB Host (3.3V I/O interface)

ADUM VBUSx on both sides applied with 5V supply and desire the digital I/Fs to be at 3.3V level

With connections as per diagram below I have measured: VDD1=5V and not 3.3V as expected.

Same on PDEN/SPU of course as these are shorted to VDD1. Have I missed something on the VDD1 connection?


On downstream port: VBUS2 measured at 5V and VDD2 measured at 3.3V as expected.