Vicor PI33XX-2X I2C Digital Interface Guide - Manual (Page 7)

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PI33XX-2X I
2
C Digital Interface Guide
FLT[0] – VCC_UV; if this bit is set, it indicates that the internal power supply for the PI33XX-2X has gone into under
voltage.
FLT[1] – UVLO; if this bit is set, the indication is that the input voltage decreased below the under voltage lock out
threshold (UVLO) at some point while the unit was in operate mode. The UVLO threshold is defined as the
minimum value required for a PI33XX-2X to be able to meet all specified parameters of operation.
FLT[2] – OVLO; if set indicates that the input voltage exceeded the over voltage lockout threshold (OVLO) at some
point while the unit was in operate mode. The OVLO threshold is that value where the input voltage is too high for
a PI33XX-2X to be able to meet all specified parameters of operation.
FLT[3] – VOUT_HI; if this bit is set, it indicates that the error amplifier input was higher than it should be for the
programmed output voltage during operate mode, indicating that the output voltage may be too high.
FLT[4] – SLOW_IL; if this bit is set, it indicates that the error amplifier output was at the positive rail for more than
1 ms during operate mode. This means that the load current demand was higher than the maximum output
current available from the PI33XX-2X.
FLT[5] – FAST_IL; if this bit is set, it indicates that the peak current in the output inductor was higher than the
maximum peak current allowed during operate mode. It is an indicator of output short circuit or inductor failure.
FLT[6] – OTP; if this bit is set, it indicates that the PI33XX-2X internal temperature exceeded the maximum
temperature for safe operation during operate mode and that the PI33XX-2X shut down to prevent damage.
The “Clear” button allows the user to clear the PI33XX-2X fault telemetry information.
The “ENA POL” button allows the user to read the EN polarity by left clicking on it. Changing the polarity can be
accomplished by entering the desired value in the dialog box and then left clicking the “BURN” button. The Picor
Buck GUI will then instruct the user for the remaining steps. The burn function is irreversible and requires careful
consideration. For that reason, further details can be found in the section “Configuration Programming”
The “SYNC” button allows the user to read the SYNC polarity and delay settings by left clicking on it. Changing the
polarity can be accomplished by entering the desired value in the dialog box and then left clicking the “BURN”
button. The Picor Buck GUI will then instruct the user for the remaining steps. The burn function is irreversible and
requires careful consideration. For that reason, further details can be found in the section “Configuration
Programming”
The “KILL BIT2” button allows the user to prevent further changes to any programmed register value when used in
conjunction with the “BURN” button. The burn function is irreversible and requires careful consideration. For that
reason, further details can be found in the section “Configuration Programming”
The “MARGIN” button operates using volatile memory. Any changes made to this register are dynamic and will
change as soon as the command is sent. The user simply enters the value they wish to margin and then clicks
margin. Any value sent to this register will be lost as soon as power is removed. Note that margining down 20% or
more in one step may cause a VOUT_HI fault, which is a normal condition.