USB2244 IC CARD POWER is never supplied AND USB PORT NOT DETECTING

Projects General Guidance
1

Hello,

I have been trying to use the USB2244 on a board but i can't seem to get it working and I am not sure what the problem is. I have went over and over the datasheet but can't seem to figure out what i'm missing . I have attached my schematics, I have verified i have 3.3V, and also that the 1.8 Rails are both being generated internally, i do have a 24MHz clock as well.

when i insert a MicroSD card i see the CD line go low BUT the CRD_PWR is never supplied. and USB2244 is connected to system ,usb port not detected.

I can't figure out what i could be missing ?

usb2244
usb2244980×787 137 KB

4

Have you had a read through the design checklist that Microchip provide? It might hold some clues.

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