Vicor PI33XX-2X I2C Digital Interface Guide - Manual

vicorpower.com Rev 1.0 Cool-Power
®
800 735.6200 11/2012 Page 1 of 22
Cool-Power
®
PI33XX-2X
PI33XX-2X I
2
C Digital Interface Guide
Description
The PI33XX-2X I
2
C Digital Interface Guide provides an
overview of how to read and write to the user
accessible registers within the PI33XX-2X series. This
guide details use of the Picor 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.
Contents
Section Page
Program Capability………………………….….. 1
Fault Telemetry……………………………………. 1
I
2
C Communication Compatibility ……….. 1
Interface Software Tool……………………….. 1
USB Interface Hardware………………………. 2
Addressing & Register Mapping…………… 3
Software Installation and Operation……. 4
Fault Telemetry Command Description.. 8
Configuration Programming………………… 12
Programming Initial Conditions…………... 16
Configuration Examples
Sync Delay…………………………....…...……. 17
Enable polarity……………….……………….. 19
Setting Kill Bit……………….……………..….. 20
Error Messages……………………………………. 21
Notes…………………………………………………... 22
Program Capability
The PI33XX-2X 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 Vout margining which settings are stored in
volatile memory only and not retained by the device.
Fault Telemetry
The PI33XX-2X can report when a fault is detected
via the I
2
C interface. Reported faults include:

Input Under Voltage Lock Out (UVLO)

Input Over Voltage Lockout (OVLO)

Output Voltage Over Voltage

Over-Temperature Protection (OVP)

Slow Current Limit

Fast Current Limit

VCC (internal to the SIP) Undervoltage
I
2
C Communication Compatibility
The PI33XX-2X 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-2X
is configured as an I
2
C slave device with no internal
bus pull up or pull down.
Interface Software Tool
The Picor Buck GUI software tool 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.