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How should I understand VCC(I/O) of TUSB1106?

Hiroshi Hashimoto16564
Intellectual 310 points
Other Parts Discussed in Thread: TUSB1106, TUSB1105

Hello,

I was asked about the explanation of VCC(I/O) on the datasheet from customer.

  In the page 4, VCC(I/O) must never exceed the Vreg(3.3) voltage.

  In the page 6, Sharing mode is VCC(I/O) connected, and VCC(5.0) or Vreg(3.3) is not connected.


In the case of sharing mode, VCC(I/O) voltage is greater than Vreg(3.3) voltage.

Customer pointed out in this case is mismatch to explanation of page 4.

How we should be understand?

Also, When "VCC(I/O)" is staying ON, Change "VCC(5.0)" and "Vreg(3.3)" from ON to OFF.
Are any problems happen during change?

  • 0
    TI__Prodigy 750 points

    Hello,

    The TUSB1105 and TUSB1106 have 3 voltage regions that are Vcc(5.0), Vreg(3.3) and Vcc(I/O). Vcc(5.0) is used for only 5V power line in circuit and generate internal regulator to 3.3V to activate USB side. However Vcc(I/O) is independent from those 2 Vcc(5.0) and Vreg(3.3). What datasheet meaning is Vcc(I/O) can accept Vreg(3.3) range spec, so it should be OK even Vreg(3.3) is not presented, the device can accept Vcc(I/O) within Vreg(3.3) spec, I mean the device can accept Vcc(I/O) up to 3.6V.