Vicor PI33XX-2X I2C Digital Interface Guide - Manual (Page 6)

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PI33XX-2X I
2
C Digital Interface Guide
installed with the power already applied to the PI33XX-2X. Always power down the PI33XX-2X prior to installing or
removing the LinkM.
The following information is intended to provide the user with a description of the various “soft” buttons and user
menus available in Picor Buck GUI.
The “File” menu provides “Exit” as the only option available when left clicking on it. If the user chooses “Exit”, a
dialog box will pop up to allow the user to confirm their selection. If “Yes” is chosen, the GUI will close and Picor
Buck GUI will terminate. If “No” is selected, the user will be returned to the main program without exiting the GUI.
The “Help” menu provides the current revision of Picor Buck GUI. There is no interactive user help or search utility
provided at this time, although there may be expanded help facilities in the future build releases of the software.
The “Address” menu will produce a drop down dialog box for the user to be able to select the decimal address of
the PI33XX-2X determined by the ADR0 and ADR1 decodes in Table 1. For example, if the PI33XX-2X unit has both
ADR0 and ADR1 floating or not connected, the slave address will be 76 decimal or 4C. Configuring ADRO and ADR1
allow for eight addressable locations from 72d to 79d or 48h to 4Fh.
The “FAULT” button allows the user to read the PI33XX-2X fault telemetry information. The fault register is 8 bits
wide with the most significant bit set to logic 0 always. The gray indicator panels for each fault on the Picor Buck
GUI display will illuminate bright red to indicate the decoded fault(s) for the user, so they don’t have to refer to
Table 3 for the decoded value. In addition, the binary value of the register will be displayed in the “FAULT”
window.
Table 3 - Fault Register Assignments
The PI33XX-2X fault logging only occurs when the controller is in normal operation mode. After a fault is detected
and assessed, the fault is latched into the register so long as the controller Vcc is active and above the minimum
threshold. The controller will take the appropriate action to protect the PI33XX-2X and system based on the type
of fault. If for example, the input voltage is high enough to power the controller but below the minimum under
voltage lock out threshold, the controller will prevent the unit from enabling and remain in a low power state.
Since it has not entered operate mode, the UVLO fault will not be logged. If the input voltage is higher than the
under voltage lock out threshold but drops to zero, the fault will remain latched as long as there is Vcc to the
controller. Once the controller Vcc dips below the minimum value, the fault data will not remain valid. The fault
register will be cleared upon power on reset. If Vcc remains after a logged fault, the fault register must be cleared
in order to log any new events. A description of the logged faults is as follows:
FLT[7] FLT[6] FLT[5] FLT[4] FLT[3] FLT[2] FLT[1] FLT[0]
0 OTP FAST_ IL SLOW_IL VOUT_HI OVLO UVLO VCC_UV