TUSB212: TUSB211ARWBRQ1

is this I2C mode is defined only by the part selected ?

Hello,

This device enters I2C mode when it sees a 4.7KOhm pull-up on the SDA and SCL pins on device reset. If it does not see these pull-ups, the device will enter pin-strap mode. However, that should not affect CD pin functionality.

If you are not seeing the CD pin go high when a device is connected, then either the device is not powered, or it does not see a valid USB connection. Pease make sure that the USB2 trace stays connected under the device, as the redriver does not carry the signal through the device, it only passively boosts the signal.

Please make sure the redriver is powered and enabled BEFORE any data is sent through the USB2 lines, or else the redriver may not enable.

Additionally, in general, we recommend the TUSB216 over the TUSB212, due to improvements in boosting performance and noise performance.

Thanks,

Ryan

USB trace under the device is connected 

USB interface is up Device is detected but the pin is not changing state 

no activity at this point 

USB device connected in the connector at is detecting at the host CPU 

Hello,

You aren't seeing any activity on the CD pin or the ENA_HS pin? Is it possible to monitor the signal to see if there is any boosting being done to the signal, I.E an eye diagram?

Can you monitor VREG and VCC to ensure that the device is powered? If the redriver is enabled, VREG should be 1.8V.

If the redriver sees any connection whatsoever, the CD pin should enable, so either it is not powered, or it is not seeing that connection.

Thanks,

Ryan

VREG Is 2.5V VCC IS 3.3V

the behavior is CD is changing state when i first plugged the USB if i un plug and plug it back  its not changing state ,but device is detected on all the time in the CPU 

After second plug in plug out the GPIO stays high 

Hello,

So just to confirm:

USB Device is plugged in, unplugged, and then plugged back in: CD pin stays low.

After this, USB Device is unplugged and plugged back in, CD turns high.

Or is the CD pin low or high in all scenarios?

Would it be possible to switch and test with the TUSB211A or the TUSB216? Typically, the CD and ENA_HS pin performance is a bit more consistent on those devices than the TUSB212.

Thanks,

Ryan

In next build i am using TUSB216 

initially the CD pin is low first plug in goes high plug out goes low  then plugin goes high and stays in high if i plugin plug out 

Hello,

Understood, that's not the behavior we expect. Do you have an EVM on hand to see if you can replicate that? If not, no worries.

I believe the TUSB216 should resolve this.

Thanks,

Ryan