Posted on June 11, 2018 at 15:01Hi,
I am trying to build a daughter card using the USB2642 to provide two USB ports and a SD card slot to a processor board. I am trying to do a minimalistic design that draws the least amount of power and smallest foot print. The daughter cards will be fixed. I have created the following design and tested it and it works, but having a few problems:
1. Power Draw, this board pulls 250mA of power with no SD card or USB devices attached and the USB2642 gets really hot. Is this normal? I don't believe it is so I am trying to figure out what wrong with my design. Do I need EEPROM to change register values to control the FET?
Also my USB cards are fixed and I tried power them from main power, and eliminate the MIC2026. It didn't effect the power drain.
Any thoughts?
#usb2642
