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Part Number: TUSB2077A
I'm have a PCB with TUSB2077A I am getting a no USB device descriptor error when i plug into windows. I get power successfully both 5V & 3.3V but there is no crystal.
I have verified that the device is not in suspend mode ( suspend = high 3.3V). The crystal is stuck at 1.5V and there is never any 6MHz crystal oscillation. I have used the same crystal part on other TI hubs and it works so I don't think it's an issue with the crystal.
I have tried modified the Power On Reset circuit and have verified with the scope a timing of 600 uS between 90 % of 3.3V( 2.97V) and Reset no longer asserted. I have also tried other resistors instead of 15K an 0.1uF but nothing has changed.
Can you please review my schematic and let me know if you notice anything ? I'm happy to try any change or collect scope captures to further investigate.
Is the E2E thread linked below the same as the issue reported here? If so we will continue to respond on the other E2E thread.If not please provide the schematic by attaching it to this thread.
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In reply to Malik Barton57:
Yes sorry, this is the same issue. this thread wouldn't allow me to upload the schematic so i made another. Please just respond on the other thread.
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