UG:309
Page 1
PI33xx‑xx‑EVAL1
ZVS Switching Regulators
I
2
C™ Digital Interface Guide
Introduction
The PI33xx‑xx I
2
C digital interface guide provides an overview of how to read and write to the user
accessible registers within the PI33xx‑xx series. This guide details use of the Vicor I
2
C digital interface
software tool coupled with a USB based I
2
C hardware interface device. Information is also provided for
I
2
C communication protocol using generic tools and/or embedded hardware.
Program Capability
The PI33xx‑xx devices provide an I
2
C digital interface that enables the user to program the EN pin
polarity (from high to low assertion) and input switching frequency synchronization phase/delay.
Margining the output is also available via the I
2
C interface.
All settings are one‑time programmable except for the V
OUT
margining, which settings are stored in
volatile memory only and not retained by the device.
Fault Telemetry
The PI33xx‑xx can report when a fault is detected via the I
2
C interface.
Reported faults include:
n
Input Undervoltage Lockout (UVLO)
n
Input Overvoltage Lockout (OVLO)
n
Output Voltage Overvoltage (OVP)
n
Overtemperature Protection (OTP)
n
Slow Current Limit
n
Fast Current Limit
n
V
CC
(internal to the SiP) Undervoltage
I
2
C Communication Compatibility
The PI33xx‑xx is hardware‑compatible with the NXP I
2
C bus specification Version 2.1 Standard Mode
(100kHz) January 2000 for all bus timing and voltage resistors levels up to 5.5V maximum. The
PI33xx‑xx is configured as an I
2
C child device with no internal bus pull up or pull down.
Interface Software Tool
The Buck GUI software tool offered by Vicor allows quick access to the one time programmable
parameters and user adjustable parameters. The one time user programmable parameters include
enable (EN) polarity, synchronization (SYNCI) delay and edge trigger. User‑adjustable parameters include
output margin (MRGN) level percentage and the ability to clear the fault (FLT) register. This software also
provides the user with the ability to read and decode fault telemetry information.
The Buck GUI operates under the Windows™ 7 or XP (Service Pack 3) environment. Java™ version 1.5
or greater 32‑bit version is required. This software has been tested using Windows 7, 32 bit and 64 bit
and Windows XP with service pack 3.
USER GUIDE | UG:309
Contents Page
Summary of Contents for PI33 EVAL1 Series
Page 13: ...UG 309 Page 13 Figure 14 PI33xx xx SYNC 1000 timing Figure 15 PI33xx xx SYNC 1111 1 4MP ...
Page 14: ...UG 309 Page 14 Figure 16 PI33xx xx SYNC 1110 1 3MP Figure 17 PI33xx xx SYNC 1101 1 2MP ...
Page 15: ...UG 309 Page 15 Figure 18 PI33xx xx SYNC 1100 2 3MP Figure 19 PI33xx xx SYNC 1001 3 4MP ...
