Other Parts Discussed in Thread: TUSB216, TUSB212
C1: Single Board Computer with USB OTG
C2: 1m Micro-USB to USB-A Cable
C3: PCB with TUSB21x on it
C4: 5m USB-B to USB-A Cable
C3: PC or Laptop
In our application scenario (as seen above) we do not see any improvement when using a PCB with TUSB21x (C3) instead of just using a USB-A to USB-B coupler.
In fact, results are slightly worse compared to a plain coupler. Our goal is to get 5m USB Cables (C4) working between a PC (C5) and our housed device but the maximum working cable length for C4 is 2-3m.
We started off with a TUSB211 then changed to TUSB212 as we thought it could be DC offset issues (which wasn’t the case) and finally we changed to TUSB216 because we wanted to try it the additional RX sensitivity possibility. For all TUSB21x we have systematically tried the different settings (if supported by the respective IC) on AC boost, DC boost and RX sensitivity without success.
For some reason we can’t see why the signal quality does not seem to get better in any case.
We could provide schematics and PCB layout via a non-public way…
Unfortunately, we do not have eye-diagram measuring equipment to provide further details (which makes it hard to judge I guess...)
Questions are:
- Is the TUSB21x (TUSB211, TUSB212, TUSB216) intended for the setup described?
- As we are running out of ideas – does TI have some ideas which we may not have thought of?
Any help would be much appreciated! Thanks in advance