ISL28025 Precision Digital Power Monitor Evaluation Kit User Guide

APPLICATION NOTE

AN1933 Rev 1.00 Page 1 of 19

March 9, 2016

AN1933

Rev 1.00

March 9, 2016

Introduction

The Precision Digital Power Monitor (DPM) Evaluation Kit is a

three evaluation board design that demonstrates the

functionality of the ISL28025. The ISL28025 is an IC with a

16-bit analog-to-digital converter (ADC), an 8-bit

digital-to-analog converter (DAC), and analog comparators that

monitor for undervoltage, overvoltage and overcurrent

conditions. The IC is serially controlled through an I

C bus. The

device abides by the PMBus standards.

The DPM Evaluation kit is accompanied by a graphical user

interface (GUI) that allows the user to configure ISL28025 for

monitoring bus voltage and current in a specific application.

The GUI has a data save feature allowing the transfer of

measurement data to another software application for

analysis.

The ISL28025 DPM evaluation kit consists of three boards; a

dongle, a generic ISL28025 board and an ISL28025

demonstration board.

Dongle Evaluation Board

(ISLUSBPWRDONGLE1Z)

The dongle board mates from a PC to the ISL28025 via a

microcontroller. The microcontroller converts USB commands

sourced from the PC to an I

C header. The I

C pins (SCL and

SDA) are connected to the right angle header at the edge of

the board. The dongle board has a circuit that converts the USB

supply voltage to 3.3V. The 3.3V supply circuit has an

ISL28022 connected to monitor the current sourced by the

supply. Each circuit has been optimized to measure 100mA at

full scale. The 3.3V supply output and the SDA and SCL lines of

the I

C bus are routed to the right angle connector.

ISL28025 Generic Board (ISL28025EVAL1Z)

The generic ISL28025 board is a non-configured ISL28025

that connects the analog inputs to the outside world. The

board allows a user to build a system that requires voltage,

current or power monitoring around the ISL28025. The analog

inputs (VINP, VINM and VBUS) of the ISL28025 accept input

voltages ranging from 0V to 60V. The ISL28025 allows the

user to uniquely configure the slave address via jumper

selections. The ISL28025 can be powered from a user defined

source or the 3.3V supply generated from the USB voltage. The

acceptable power supply voltage range for the ISL28025 is

from 3V to 5.5V. The external clock/interrupt pin is routed to

the outside world via a jumper selection. The maximum

measurable input differential (VINP - VINM) is ±80mV. The

differential voltage between the VINP and VINM pins can

withstand a magnitude of 60V. The differential supply

tolerance allows for the debugging of catastrophic circuit

events.

ISL28025 Demo Board (ISL28025EVAL2Z)

A peripheral circuit is required to demonstrate the functionality

of the ISL28025. The ISL28025 is paired up with a buck/boost

regulator (ISL9110) and some sample loads to measure the

current.

The buck/boost circuit allows the user to define a unique load

that connects to the regulator. All features of the ISL28025 are

available.

Ordering Information

PART NUMBER DESCRIPTION

ISL28025EVAL1Z Evaluation Board

ISL28025EVKIT1Z Evaluation Kit

FIGURE 1. ISL28025 EVALUATION KIT EVALUATION BOARDS

USB DONGLE ISL28025EVAL2Z

DEMO BOARD

ISL28025EVAL1Z

GENERIC EVAL BOARD

ISL28025 Precision Digital Power

Monitor Evaluation Kit User Guide

AN1933 Rev 1.00 Page 2 of 19

March 9, 2016

Evaluation Package (Online Order)

The Digital Power Monitor Generic Evaluation Kit contains the

following items:

• ISL28025 Demo Board (ISL28025EVAL2Z)

• ISL28025 Generic Board (ISL28025EVAL1Z)

•USB to I

C Dongle Board (ISLUSBPWRDONGLE1Z)

• Evaluation Software (Online)

•User Guide

• ISL28025

Datasheet

Documentation for individual device can be found in the

following link: http://www.intersil.com/products/ISL28025

System Requirements

• Windows 98/NT/2000/XP/VISTA/WIN7/WIN8

• Available USB Port

Software Installation

Download the latest Evaluation Board GUI (Graphical User

Interface) from the following link:

http://www.intersil.com/products/ISL28025

Installing the Software

From the link supplied in the previous section, download and run

the executable file to start installing the GUI. The user will be

greeted by the screen shown in Figure 2

. Continue through the

installer and read the instructions. The PC and PCB should not be

connected via the USB port until after the installation has

completed.

Hardware Setup

• Connect the USB 2.0 Cable to the PC first, and then to the

Evaluation Board

• The computer may ask about installing software for new found

hardware; select “Yes, this time only”

• On the following screen, it will ask about how to install

hardware. Select the recommended option (Installing from CD)

and follow the directions

• The USB is the only connector needed

Running the Software with the ISL28025

Generic Board

To run the program, go to the “Start” menu and choose the

ISL28025 setup folder, and then choose the

ISL28023_25EvalSoftwareSetup icon. Once clicked, the demo

software window should appear as illustrated in Figure 3

Enable communication between the evaluation board and the

computer by pressing the “Connect to Device” button at the

bottom right of the software window. If connection is successful,

the text on the button will be red and read “Disconnect Device” as

shown in Figure 3

. Otherwise, the button text will not change.

The evaluation program controls and measures an ISL28025

device on a single I

C/SMBus. The main software window

displays one site.

DATA COLLECTING

To start collecting data, press the “Start Data Collecting” button

located to the left of the “Connect to Device” button at the

bottom of the screen. Once pressed, the color of the text and

verbiage of the button will change to “Stop Data Collecting”. The

defaults state of the software reads each DPM for shunt and bus

voltages. To change the read settings of the DPM, toggle the

check box/label next to each numerical read out. The backlight

of the display will toggle between yellow and gray. A backlight of

yellow means a channel is enabled. A change in the functionality

of the DPM will change the mode value for the respective

channel. The mode of each DPM is displayed in the lower left

hand corner of each channel’s display.

FIGURE 2. INSTALLATION WELCOME SCREEN