Intersil ISL88731EVAL2Z, ISL88731CEVAL2Z Setup Procedure

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Application Note 1404

ISL88731EVAL2Z and ISL88731CEVAL2Z Evaluation Boards Setup Procedure

Introduction

The ISL88731 and ISL88731C are highly integrated battery charger controllers for Li-ion/Li-ion polymer batteries with SMBus interface controlling charge voltage, charge current and input current limiting. The evaluation board includes a USB to SMBus interface to allow users to control the ISL88731 or ISL88731C from a Personal Computer.

What’s Inside

This Evaluation Board Kit contains the following materials:

• Qty (1) ISL88731EVAL2Z or ISL88731CEVAL2Z Evaluation Board

• Qty (1) USB cable

ISL88731(C)EVAL2Z

ISL88731 EVAL2Z REVB

AC ADAPTER

INPUT

AC ADAPTER

ADJUSTABLE DC POWER

DC POWER SUPPLY

SUPPLY

5V – 20V, 5A

INPUT

INTERSIL

What is Needed

The following materials are recommended to perform testing:

• One AC adaptor or one adjustable 25V/6A DC power supply

• Two adjustable electronic loads with constant current mode and constant voltage mode

•One Volt Meter

• One 500MHz four-channel oscilloscope with voltage and current probes

• A Personal Computer (PC) with ISL88731(C) control software and drivers (all available on the self extracting archive file ISL88731_v3.0_Installer.exe available for download from www.Intersil.com)

Note: The National Instruments Runtime Engine must be installed before connecting the evaluation board to your PC. The Runtime Engine contains driver files required by the New Hardware Wizard.

SYSTEM

OUTPUT

SYSTEM LOAD

ELECTRONIC LOAD

FIGURE 1. ISL88731(C)EVAL2Z HARDWARE CONNECTION DIAGRAM

June 27, 2011 AN1404.2

1-888-INTERSIL or 1-888-468-3774

USB

TO VARIOUS

TO VARIOUS TEST POINTS

TEST POINTS

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

| Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

BATTERY

OUTPUT

All other trademarks mentioned are the property of their respective owners.

BATTERY PACK

ELECTRONIC LOAD

DC VOLTMETER

<10mV to >20v

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Application Note 1404

Download, Extract and Install the Software

Download the self extracting archive file ISL88731_v3.0_Installer.exe. The URL for the file is:

http://www.intersil.com/data/ev/isl88731_control_v3_sw_in staller.zip

It will create a folder (“ISL88731 Installer”) in the folder that holds the self extracting file. A dialog box will give you the opportunity to change the location of the extracted files.

Make a note of the location of the folder. You will need to direct the New Hardware Wizard to this folder for the driver.

Software Installation

Both the ISL88731(C) control program and the National Instruments run time engine are installed from the “ISL88731 Installer” folder. Navigate to the folder and double click the “AutoRun.exe” file. You should see the window as shown in Figure 2.

Click on the “Install or Uninstall ISL88731 Control Software” to run the Installation Wizard.

You should now see a window as shown in Figure 3.

FIGURE 2. ISL88731(C)EVAL2Z CONTROL SOFTWARE INSTALLATION MENU

FIGURE 3. ISL88731(C)EVAL2Z CONTROL SOFTWARE INSTALLATION WIZARD

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Application Note 1404

In most PCs the National Instruments Runtime Engine will be installed automatically after the ISL88731(C) control software. You should see the window as shown in Figure 4.

FIGURE 4. NATIONAL INSTRUMENTS RUNTIME ENGINE INSTALLATION WIZARD

Follow the instructions to install the Runtime Engine. If it does not run automatically, click “Install National Instruments Runtime Engine” on the ISL88731(C)EVAL2Z Control Software Installation Menu (see Figure 2). After installation, click on the Close Menu button.

Driver Installation

Connect the ISL88731(C)EVAL2Z to the USB port of your PC.

Note: The SMBus part of the ISL88731(C) and the USB-SMBus interface are powered by the 5V from the USB port on the PC. It is not necessary to have other power supplies connected to the evaluation board to read or write to the ISL88731(C).

When WINDOWS detects new hardware, the new hardware wizard should appear. Direct it to look for the driver information file in the “ISL88731 Installer” folder (extracted from the downloaded file). In some systems, it may be necessary to specify the driver information file (USB-I2C_WDM.inf).

Run the ISL88731 Application

ISL88731(C) control software should now appear in your Start/All Programs list. Click on it to run the application.

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Application Note 1404

Figure 5 shows a screen shot of the ISL88731(C) control software user interface.

FIGURE 5. ISL88731(C)EVAL2Z CONTROL SOFTWARE SCREEN SHOT

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Application Note 1404

Enable the Output

When power is applied to the ISL88731(C), the Charge Current and Charge Voltage Registers are 0x0000 and the output is disabled. The output is enabled by writing valid, non-zero values to these 2 registers. See the ISL88731(C) datasheet for valid values.

The ISL88731(C) is also disabled if the ACIN pin is below 3.2V. An Input voltage >13.1V will pull ACIN above 3.2V. The minimum input voltage can be adjusted on the evaluation board by changing R

or R7 (see Figure 10).

Description of the User Interface Controls and Display Information

Clicking the “Write All” button will write the indicated SMBus sequences to Registers 14, 15 and 3F in the ISL88731(C).

Clicking on the “Read All” button will read all 5 registers in the ISL88731(C) and display the results in the grey indicators below the “Read All” button.

If the device and the interface are operating normally, the VendorID (reg FE) and the DeviceID (reg FF) will display as follows:

If the VendorID (reg FE) and DeviceID (reg FF) remain 0000 it indicates a communication problem.

If the Visa resource name is blank, it indicates a problem with the USB communication.

Clicking on the “RESET INTERFACE” button may correct the problem. If not, try closing the software, remove power and USB connections from the evaluation board, then reconnect and restart.

Note the register contents in the user interface are updated ONLY when the “Read All” button is clicked.

The “Write Charge Current” button sends only the charge current command to the ISL88731(C). Other registers are unchanged.

The small white window next to “Charge Current” accepts inputs in Amps, and converts them the hexadecimal (hex) value to be written to the ISL88731(C) in the grey window.

the enter key, the display will change to 4.096. The value can be incremented and decremented with the up/down arrows at the left of the window.

The Sense R inputs are used to calculate the hexadecimal (hex) values and the SMBus sequences for the Charge Current limit and Input Current limit entered in the white boxes. The evaluation board is built with 10mΩ sense resistors. If you change them to another value, enter the new value to get correct calculations.

After entering a number in the white box, hitting the enter key or clicking on another area will enter the value and the resulting hex value and the SMBus sequence will be calculated and displayed.

S = the Start condition, A = the Acknowledge, P = the Stop condition.

Note: The LO byte is sent first. The HI byte is sent second.

When writing 0x41A0, 0xA0 is written first and 0x41 is sent second.

Important Note: The SMBus commands are NOT sent until one of the WRITE buttons is clicked (i.e. Write All or Write Charge Current).

The “Write Charge Voltage” button writes only the Charge Voltage register. Other registers are unchanged.

The small white window accepts Charge Voltage (in Volts) and calculates the hexadecimal value and the SMBus sequence to write to the ISL88731(C). The SMBus command is sent when the “Write Charge Voltage” or “Write All” button is clicked. See Figure 8.

The “Write Input Current” button writes only the Input Current register. Other registers are unchanged. The small white window accepts Input Current Limit in Amps and calculates the hex value and the SMBus sequence to be written to the ISL88731(C). The Sense R input Is used to calculate the hex value and the SMBus sequence. The SMBus command is sent when the “Write Input Current” or “Write All” button is clicked. See Figure 9.

The ISL88731(C) will shut down unless it receives Charge Voltage or Charge Current commands every 175s. This is a safety feature that prevents overcharging batteries if bus master has stopped functioning. The control software includes the function to write the Charge Current register every 60 seconds, which can be enabled or disabled as shown in Figure 6 and Figure 7.

The hex value depends on the value entered in Sense R.

The value in the white window will be forced to the nearest valid number that can be produced by the DAC in the ISL88731(C). That is, after entering 4 and hitting the enter key, the display will change to 3.968. After entering 4.1 and hitting

FIGURE 6. ENABLE WRITING CHARGE CURRENT REGISTER EVERY

60 SECONDS

FIGURE 7. DISABLE WRITING CHARGE CURRENT

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Application Note 1404

FIGURE 8. WRITE CHARGE VOLTAGE BLOCK

FIGURE 9. WRITE INPUT CURRENT BLOCK

Interface Troubleshooting

When the evaluation board is connected to the PC by a USB cable and the software is running, the software assigns a VISA resource name.

If this window is blank, it indicates a problem with communication between the PC and the micro controller on the evaluation board. Check and correct the connection of the USB cable to your PC and the evaluation board. Click on the “RESET INTERFACE” button.

If you still get no VISA resource name, Close and restart the ISL88731(C) control software.

If you still get no VISA resource name, Open the Device Manager (Control Panel/System/Device Manager) with the ISL88731(C)EVAL2Z evaluation board connected to your USB port. You should see a device named “NI-VISA USB Device”. If it is not in the list of devices, the driver may not be correctly installed. Run the New Hardware wizard.

If you still get no VISA resource name, contact your Intersil Field Application Engineer for assistance.

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Application Note 1404

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ISL88731(C)EVAL2Z Schematics

SEE PAGE 2

LGATE-PGDN

PHASE-PGND

UGATE-PGND

CSON

R20

100

TP27TP26

CSOP

R17

4.7

C11

1UF

LGATE

C10

1UF

BOOT

CSSN

R13

R23

0.1UF

C24

0.01

R19

TP19 TP20

TP25

0.01

R24

SCL

TP10

10UF

C14

PHASE

C17

10UF

VREF

VCC

ACIN

VBAT

CSSP

0.01UF

TP7

TP6

TP9

TP8

TP5

TP4

TP12

33K

0.01UF

R30

100K

R11

TP1

TP2

SI4835BDY

BSS138

0.1UF

100K

R4 R2

0.1UF

0.047UF

0.01

TP11

0.01UF

10K

R10

TP31

TP30

214

876

Q11

TP17

TP16

TP15

TP14

TP13

314

876

R18

876

IRF7821

1UF

VDDSMB

0.22UF

1UF

ISL88731

SDA

UGATE

0.01UF

100K

C16

VCOMP

ICOMP

TP18

VDDP

8.2UH

100K

OPEN

R22C23

OPEN

TP21

TP22

TP23

TP24

C12

0.1UF

C13

10UF

C15

1 2

VREF

ICM

ACOK

CSON

DCIN

PHASE

UGATE

BOOT

VCC

CSSN

CSSP

LGATE

PGND

CSOP

VDDSMB

ICOMP

VCOMP

SDA

SCL

VFB

VDDP

GND

ACIN

FIGURE 10. ISL88731(C)EVAL2Z SCHEMATIC

(C)

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Application Note 1404

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ISL88731(C)EVAL2Z Schematics (Continued)

SDA

GND

SCL

DEBUG

R311

R310

F325

U303

C304

C307

R304

C305

R303

J301

R302

C308

C309

TP3041TP305

R305

10111213141516

U301

TP306

TP303

R307

R309

R399

TP300

TP3011TP302

1.8K

VDDSMB

SCL

SDA

SN65220DBV

1UF

0.1UF

897-30-004-90-000

1UF

0.1UF

C8051F320

GND

USB

MOUNT

P0.1

GND

D+

D-

VDD

P3.0/C2D

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

P2.0

P2.1

P0.6

P1.1

P0.3

P0.4

P0.5

P0.7

P0.2

P1.0

P0.0

REGIN

VBUS

RST/C2CK

FIGURE 11. ISL88731(C)EVAL2Z SCHEMATIC (USB - SMBUS INTERFACE)

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Application Note 1404

TABLE 1. ISL88731(C)EVAL2Z BILL OF MATERIALS

REF DES PART NUMBER VALUE MANUFACTURER DESCRIPTION

C1, C10, C11 H1045-00105-6R3V10 1µF GENERIC Multilayer Capacitor

C24 H1044-00104-16V10 0.1µF GENERIC Multilayer Capacitor

C2-C4, C7 H1045-00103-25V10 0.01µF GENERIC Multilayer Capacitor

C304, C308 H1045-00105-6R3V10 1µF GENERIC Multilayer Capacitor

C5 H1046-00105-25V10 1µF GENERIC Multilayer Capacitor

C6, C16 H1045-00104-25V10 0.1µF GENERIC Multilayer Capacitor

C8 H1045-00224-25V20 0.22µF GENERIC Multilayer Capacitor

C9 H1045-00473-25V10 0.047µF GENERIC Multilayer Capacitor

D1, D2 BAT54 DIODES 30V Schottky Diode

J1, J6, J8 164-6218 MOUSER Single Point RA PCB Mount (Black)

J2, J5, J7 164-6219 MOUSER Single Point RA PCB Mount (Red)

J9, TP25 131-4353-00 TEKTRONIX Scope Probe Test Point PCB Mount

L1 HM65-8R2 8.2µH BI-Tech Shielded SMD Inductor

Q1 SI4835BDY VISHAY 30V, -7.4A P-Channel MOSFET

Q2 BSS138LT1 ON-SEMI 200mA 50V N-Channel Power MOSFET

R1, R3 H2511-00100-1/16W5 10 GENERIC Thick Film Chip Resistor

R10 H2511-01002-1/10W5 10k GENERIC Thick Film Chip Resistor

R13 H2511-00R00-1/16W1 0 GENERIC Thick Film Chip Resistor

R17 H2511-004R7-1/16W5 4.7 GENERIC Thick Film Chip Resistor

R18 H2511-00R00-1/16W 0 GENERIC Thick Film Chip Resistor

R2, R4 H2511-01003-1/16W1 100k GENERIC Thick Film Chip Resistor

R20 H2511-01000-1/16W5 100 GENERIC Thick Film Chip Resistor

R23 H2511-00220-1/16W5 22 GENERIC Thick Film Chip Resistor

R30 H2511-01001-1/16W5 1k GENERIC Thick Film Chip Resistor

R310, R311 H2511-01801-1/16W5 1.8k GENERIC Thick Film Chip Resistor

R5, R19, R24 WSL2512R0100FEA 0.01 VISHAY Power Metal Strip Resistor

R6, R11 H2511-01003-1/10W5 100k GENERIC Thick Film Chip Resistor

R7 H2511-03302-1/16W5 33k GENERIC Thick Film Chip Resistor

U1 ISL88731HRTZ

or ISL88731CHRTZ

C12 C1608X7R1H104M 0.1µF TDK Multilayer Capacitor

C13-C15, C17 H1065-00106-25V20 10µF GENERIC Multilayer Capacitor

C305, C307, C309 H1045-00104-16V10 0.1µF GENERIC Multilayer Capacitor

F325 MICROSMD050F RAYCHEM-TYCO PolySwitch SM Resetable Fuse

INTERSIL SMBus Level 2 Battery Charger

J301 897-30-004-90-000 MIL-MAX Type B Receptacle USB Connector

Q8, Q9, Q11 IRF7821PBF IR 30V, +13.6A N-Channel HEXFET Power MOSFET

R302, R303, R307,

R309, R399

R304, R305 H2511-01001-1/16W1 1k GENERIC Thick Film Chip Resistor

U301 C8051F320 SILICON

U303 SN65220DBV TI SINGLE USB Port Transient Suppressors

H2511-00R00-1/16W1 GENERIC Thick Film Chip Resistor

LABRATORIES

General Purpose MicroControllers

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Application Note 1404

ISL88731(C)EVAL2Z Evaluation Board Layout

FIGURE 12. TOP SILK SCREEN

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Application Note 1404

ISL88731(C)EVAL2Z Evaluation Board Layout (Continued)

FIGURE 13. TOP COPPER

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Application Note 1404

ISL88731(C)EVAL2Z Evaluation Board Layout (Continued)

FIGURE 14. LAYER 2 (GROUNDS) (TOP VIEW)

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Application Note 1404

ISL88731(C)EVAL2Z Evaluation Board Layout (Continued)

FIGURE 15. LAYER 3 (GROUNDS) (TOP VIEW)

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Application Note 1404

ISL88731(C)EVAL2Z Evaluation Board Layout (Continued)

FIGURE 16. BOTTOM COPPER (BOTTOM VIEW)

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Application Note 1404

ISL88731(C)EVAL2Z Evaluation Board Layout (Continued)

Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is

cautioned to verify that the Application Note or Technical Brief is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

FIGURE 17. BOTTOM SILK SCREEN (BOTTOM VIEW)

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