This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TUSB1210 set up

Other Parts Discussed in Thread: TUSB1210, TUSB1211

Team,

My customer has the following questions per the data sheet.  

I had a couple of questions:

1.  We plan onusing this in both Host and Device Mode.  We have been struggling with how
to hook up the CPEN and Vbus signals to support both modes.  My assumption
would be Figure 10-1 would cover both options where as Figure 10-2 is a Device only
mode.  

2.  Do you havea suggestion for a Vbus switch to use with this component.  There are
quite a few on TI, and it was not obvious what would be the best solution.
 Our driving requirement is cost and -40 to 105C temp range.  We also
need lead-free.

3.  Per Figure 5-1, it shows that Vdd33 (3.3V) should come up before Vdd18 (1.8V).
 However, no additional information is provided on the requirements for
that power sequencing.  We have an issue on our board in which all of our
other multi-voltage devices require 1.8V to come up before or at the same time
as 3.3V.  What would be the implications of bringing up 1.8 before 3.3 or
at the same time?

Regards,

Aaron

  • Hello Aaron,

       1.- Yes you are right, the figure 10-1 covers both functionalities.

        2.- I don't have any good suggestion, since there is no EVM for the TUSB1210 and  these switches are not in our group. 

        3.- The recommended operation is for VBAT (as well as VDD33) to be present before VDDIO. Applying VDDIO before VBAT to TUSB1210 is not recommended as there is a diode from VDDIO to VBAT which will be forward biased when VDDIO is present but VBAT is not present. Consequently VBAT node will be charged to a diode drop below VDDIO, and may cause some internal leakage in TUSB1210. However it is unlikely this leakage will be significant (3uA in typical lab measurements on TUSB1211), and since it is transitory only, it should be acceptable.  

    Best regards,

    Diego.