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problem about UCD9222's VID

Feng
Expert 2985 points
Other Parts Discussed in Thread: UCD9222, UCD7242

Hi all,

In C6678 EVM schematics, I found that one channel of the UCD9222 connected C6678's VID pins. This channel will control the UCD7242 to output the scaled voltage.

The other channel of UCD9222 must control the UCD7242 to output fixed voltage. Does this mean that the VID pins of this channel are not necessary to connect anythings? But in the C6678 EVM schematics, this channel's VID pins connect to FPGA, I want to know what the FPGA has done about the UCD9222?

Thanks for any replies!

Feng

  • 0
    TI__Genius 13700 points

    Reviewing the configuration file for the UCD9222 used on the C6678 EVM, there is no VID configured so the connections to the FPGA are unused. 

  • 0
    TI__Prodigy 180 points

    Hi Feng,

    On UCD9222, if the VID pins are not used to change Vout, then it is not necessary to connect them to FPGA.

    On C6678EVM, rail 2 controls UCD7242 to offer a fixed output voltage. If not connecting VID pins to FPGA, for this rail 2, VID2S must be tighten to either DGND or AGND. VID2A, 2B, 2C can be left open or tighten to GND (either DGND or AGND).

    And further configure on Fusion GUI is need. You must choose "Ingore VID input pins and commands" for VID Mode for rail 2. VID Mode setting is on Fusion GUI Designer \ Configure \ VID Config. With this configuration, UCD9222 will ignore VID pins' input and also VID commands from host for rail 2.

  • 0 in reply to Brad
    Expert 2985 points

    Thanks Brad, your message is useful to me!