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UCD9090 Power on/off sequence implementation with closed loop

Other Parts Discussed in Thread: UCD9090

Hi Team,

We used UCD9090 for controlling all rails in our board. 

  1. Initially we implemented power on sequence with auto enable (0x00) option and that worked as we expected. similarly we have done for power off sequence.

  2. we moved towards  power on/ off  sequence implementation in UCD9090 with PMBUS control pin. By using PMBUS_control pin we have implemented power on/off sequence.

 3.Now, we need to make closed loop merging with under and over output voltage fault conditions and that I need to configure to GPO. That GPO I need to feed into PMBUS control pin.

Can guide us , how to implement closed loop merging with these fault conditions and How to drive PMBUS control pin along with these fault condtions?

 

  • Why do you need to connect GPO to CONTROL pin?

    If you want to shut down the rail when there is a fault, you can configure fault response.

    If you want to avoid fault shut down during margin, you can do so by setting a bit in OPERATION command. In the GUI, in Monitor section, you can select a button to disable fault response during marginning.