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DS90UB913A VDDIO mode

Toshi
Expert 1780 points
Hi tean, I'd like to know the detailed information of VDDIO mode on the 913A and 914A ? (913A; addr 0x01, bit 4) (914A; addr 0x03, bit 4) My customer is using the device as VDDIO=2.8V, which is better to set the bit 1(3.3V) or 0(1.8V) ?
  • 0
    TI__Expert 5210 points

    Hi Toshi,

    If "VDDIO Control" (bit 5) is set to a "1", then the device automatically determines the VDDIO supply voltage that the user is applying. This simply means that if VDDIO control (bit 5) is set to a "1", then bit 4 will be updated automatically depending upon the voltage applied (i.e. 3.3V or 1.8V). If VDDIO control is set to a "0", then the user must update bit 4 manually depending upon the VDDIO voltage applied.

    We recommend keeping bit 5 enabled on both devices for auto voltage control as this will update bit 4 accordingly depending upon which voltages the customer applies to the 913A and 914A. If the 913A device is operating at 2.8V, I believe the auto voltage control will select bit 1(3.3V) for the VDDIO mode. You can verify this by reading the register through I2C after system startup.

    This E2E post might also be helpful in explaining the concept:
    http://e2e.ti.com/support/interface/high_speed_interface/f/138/p/350587/1231792#1231792

    -Sean