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19-1546; Rev 0; 9/99

MAX1667 Evaluation Kit

General Description

The MAX1667 evaluation kit (EV kit) simplifies evalua-

tion of the MAX1667 chemistry-independent Level 2

smart battery charger. The EV kit includes Windows

95/98

-compatible software, which provides a handy

user interface for exercising the MAX1667’s features.

Features

Charges Any Battery Chemistry: Li+, NiCd, NiMH,

Lead Acid, etc.

SMBus™-Compatible 2-Wire Serial Interface

4A, 3A, or 1A max Battery Charge Current

Up to 18.4V Battery Voltage

Up to +28V Input Voltage

Easy-to-Use Software Included

Proven PC Board Layout

Fully Assembled and Tested Surface-Mount

Board

Evaluates: MAX1667

Component Suppliers

SUPPLIER

AVX

Central

Semiconductor

Coilcraft

Dale

Fairchild

Murata

Sprague

PHONE

803-946-0690

516-435-1110

847-639-6400

402-564-3131

408-822-2000

814-237-1431

603-224-1961

FAX

803-626-3123

516-435-1824

847-639-1469

402-563-6418

408-822-2102

814-238-0490

603-224-1430

Ordering Information

PART

MAX1667EVKIT

TEMP. RANGE

0°C to +70°C

IC PACKAGE

20 SSOP

Note:

Please indicate that you are using the MAX1667 when

contacting the above component suppliers.

Windows 95/98 are registered trademarks of Microsoft Corp.

SMBus is a registered trademark of SBS Implementers Forum.

Component List

DESIGNATION QTY

C1, C15

C2, C4, C5, C7,

C11

C6, C12

C10

C14, C17

D1, D4

D2, D3

DESCRIPTION

33µF, 25V, low-ESR tantalum caps

Sprague 594D336X0025D2T

0.1µF ceramic capacitors

0.047µF ceramic capacitor

22µF, 35V, low-ESR tantalum caps

AVX TPSE226M035R0200

0.022µF ceramic capacitor

1µF, 50V ceramic capacitor

Murata GRM42-2X7R105K050AB

1500pF ceramic capacitor

1µF, 10V min ceramic capacitors

40V, 5A Schottky diodes

Central Semiconductor CMSH5-40

Small-signal Schottky diodes

Central Semiconductor CMPSH-3

33µH, 5.5A inductor

Coilcraft DO5022P-333

30V, 11.5A N-channel MOSFET

Fairchild FDS6680

Small-signal N-channel MOSFET

2N7002

R2, R4, R7, R8

R5, R6

LED1

JU1

None

DESIGNATION QTY

DESCRIPTION

2x10 right-angle female header

5-element terminal block

40mΩ ±1%, 1W resistor

Dale WSL-2512/40mΩ/1%

10kΩ ±5% resistors

10kΩ ±1% resistor

33Ω ±5% resistors

1kΩ ±5% resistor

Red LED

3-pin header

Shunt (JU1)

MAX1667EAP

MAX1667 PC board

MAX1667 data sheet

MAX1667 EV kit data sheet

MAX1667 EV kit software disk

MAXSMBus board

MAXSMBus data sheet

Addendum to MAXSMBus data sheet

________________________________________________________________

Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

MAX1667 Evaluation Kit

Evaluates: MAX1667

Table 1. Required Equipment

EQUIPMENT

An IBM PC-compatible

computer

A parallel printer port

A standard 25-pin, straight-

through, male-to-female

cable

A DC power supply

A standard smart battery

pack or an electronic load

DESCRIPTION

Capable of running Windows

95/98

This is a 25-pin socket on the

back of the computer.

To connect the computer’s

parallel port to the Maxim

SMBus Interface Board

Capable of supplying +20V

to +28V at 4A

Capable of sinking 4A

JU1

Table 2. Jumper Functions

JUMPER

STATE

1-2*

2-3

Open

FUNCTION

SEL tied to VL, full-scale cur-

rent set to 4A

SEL tied to GND, full-scale

current set to 1A

SEL floating, full-scale current

set to 3A

*Indicates

default jumper setting.

2) Configure desired charger current using jumper JU1

(Table 2).

Important: Do not turn on the power until all con-

nections are made.

3) Connect a +20V to +28V DC power supply between

the VIN pad and the adjacent GND pad on the

MAX1667 EV kit board.

4) Connect a cable from the computer’s parallel port to

the SMBus interface board. Use a straight-through

25-pin female-to-male cable. To avoid damaging the

EV kit or your computer, do not use a 25-pin SCSI

port or any other connector that is physically similar

to the 25-pin parallel printer port.

5) Install the MAX1667 EV kit software on your comput-

er by running the INSTALL.EXE program on the flop-

py disk. This program copies the MAX1667 program

file and creates an icon for it.

_________________________Quick Start

Before you begin, you will need the equipment listed in

Table 1.

Procedure

See Figure 1, which is a diagram of the MAX1667 EV kit

system, as you follow these steps:

1) Carefully connect the boards by aligning the 20-pin

connector of the MAX1667 EV kit with the 20-pin

header of the MAXSMBus interface board. Gently

press them together. The two boards should be

flush against each other.

TO PC

PARALLEL

PORT

MAXSMBUS

MAX1667 EVALUATION KIT

VIN

GND

BATT

POWER

SUPPLY

JU1

LED1

(+) C D T (-)

(+) C D S (-)

SMART

BATTERY

Figure 1. Functional Diagram

_______________________________________________________________________________________

MAX1667 Evaluation Kit

Evaluates: MAX1667

Figure 2. MAX1667 EV Kit Software Command Panel

6) Turn on the power supply. Verify that LED1 turns on.

7) Start the MAX1667 program by opening its icon in

the Start Menu. The EV kit software automatically

detects the correct port by testing for the pin 5 to

pin 13 loopback. Verify that LED1 turns off, signify-

ing that communication between the PC and the

MAX1667 has been established.

8) The software command panel should appear

(Figure 2). Verify that Charging Voltage = 65535mV,

Charging Current = 7mA; POWER_FAIL_MASK,

HOT_STOP, and Enable Polling are checked; and

the following checkboxes are checked in the

Charger Status panel: VOLTAGE_NOTREG, VOLT-

AGE_OR, THERMISTOR_OR, THERMISTOR_COLD,

and AC_PRESENT.

Detailed Description

Upon execution of the MAX1667 program, the software

automatically resolves the SMBus address of the

device. The software enables the command panel

(Figure 2), after which the user may issue any of the

allowed SMBus commands to the MAX1667. Refer to

the MAX1667 data sheet for more information regarding

the allowed SMBus commands.

Command Panel

ChargingVoltage()

To issue the ChargingVoltage() command to the

MAX1667, enter the desired voltage, in millivolts, into

the Charging Voltage text edit box and select the adja-

cent [Send] button.

_______________________________________________________________________________________

MAX1667 Evaluation Kit

Evaluates: MAX1667

Figure 3. MAX1667 EV Kit Smart Battery Window

ChargingCurrent()

To issue the ChargingCurrent() command to the

MAX1667, enter the desired current, in milliamperes,

into the Charging Current text edit box and select the

adjacent [Send] button.

ChargerMode()

To issue the ChargerMode() command to the

MAX1667, select the checkbox beside one of the five

available Charger Mode operations. Checkboxes in the

Charger Mode panel of commands may be either

checked or unchecked; the software writes a 0 to the

MAX1667 in each bit position corresponding to opera-

tions that are unchecked, and writes a 1 in each bit

position corresponding to checked operations.

ChargerStatus()

On the right-hand side of the command panel, locate

the Enable Polling checkbox and the Charger Status

panel. If the Enable Polling checkbox is checked (the

default setting), the software automatically issues the

ChargerStatus() command three times a second, in

which case the checkboxes in the Charger Status

panel are automatically updated and always represent

the charger’s current status. Unchecking the Enable

Polling checkbox disables automatic software polling. If

polling is disabled, the user can issue the ChargerStatus()

command to the MAX1667 by selecting the [Charger

Status] button, which is adjacent to the Enable Polling

checkbox.

AlertResponse()

The MAX1667 has an external interrupt pin that is

polled by the software if the Enable Polling checkbox is

checked. When an interrupt occurs, LED1 on the EV kit

board illuminates. If polling is enabled, the software

determines which event triggered the interrupt, clears

the interrupt, and prints a diagnostic message in the

Interrupts box. If polling is disabled and an interrupt

occurs, the user can manually service the interrupt by

selecting the [Alert Response] button.

The Alert Response operation works as follows: The

SMBus specification revision 1.0 describes an optional

wired-OR signal called SMBALERT that, in a typical

system, is connected to all the devices and then pulled

up to VDD. A SLAVE device can use this signal to notify

the bus MASTER that it wants to communicate. It does

this by pulling the SMBALERT line LOW. When the

MASTER sees the SMBALERT line go LOW, it knows

that one of the SLAVE devices wants attention, but not

which one. To determine which SLAVE pulled the

SMBALERT line LOW, the MASTER broadcasts the

Alert Response Address (0x18) to all of the SLAVE

devices on the bus using a modified RECEIVE BYTE

operation. The SLAVE device wanting to communicate

with the MASTER responds with its SMBus address

(0x13) during the second byte of the modified RECEIVE

BYTE operation.

AlarmWarning()

To issue the AlarmWarning() command to the MAX1667,

select the [Alarm Warning] button. This operation sends

the AlarmWarning() command byte with a data word of

0x8000.

_______________________________________________________________________________________

MAX1667 Evaluation Kit

Communication with a Smart Battery

If a Smart Battery is connected to the MAX1667 EV kit,

the user may observe the status of the Smart Battery by

selecting the [Battery] button. At this point, the Smart

Battery window appears (Figure 3). If software polling

of the charger’s status is enabled, the software also

automatically polls the status of the Smart Battery, and

the parameters displayed in the Smart Battery window

always represent the current status of the Smart

Battery. If polling is disabled, the user can manually

query the Smart Battery by selecting the [Update] but-

ton. When finished, select the [Done] button to return to

the main MAX1667 user interface window.

and connect the (+), C, D, T, and (-) terminals across

from the EV kit board to the smart battery connector

using no more than 2 inches of wire. Attach a smart

battery to the smart battery connector and turn the EV

kit power back on. See Figure 1 if necessary.

Evaluates: MAX1667

Connecting an Electronic Load

If a Smart Battery is unavailable, an electronic load can

be connected across the BATT and GND pads on the

MAX1667 EV kit board. Make sure that the EV kit power

is turned off before connecting a load. Connect the T

pin to the (-) pin of P2 through a 10kΩ resistor (this

makes it appear to the MAX1667 as if a Smart Battery

were connected to the socket). After the load is con-

nected, program the load in voltage mode and set the

electronic load to clamp at 5V. Turn on the power to the

EV kit, and program the MAX1667 with a Charging

Voltage of 12V at the maximum Charging Current (4A in

the default case). Verify that the MAX1667 is supplying

the maximum current to the load. Increase the electronic

load clamp voltage in 1V increments, and verify that as

the electronic load voltage crosses 12V, the MAX1667

transitions from current regulation to voltage regulation;

as the electronic load voltage increases beyond 12V,

the BATT voltage should remain fixed at 12V.

Serial Communications Interface

When the user issues a command, the MAX1667 soft-

ware first determines the command byte; then, if the

command is a Write-Word type, it determines the data

word corresponding to the selected function. The soft-

ware and MAX1667 device communicate serially via

the MAXSMBus board. Refer to the MAX1667 data

sheet for more information regarding the serial commu-

nications protocol.

Detailed Description

of Hardware

Selecting Maximum Output Current

The MAX1667 EV kit can be configured to provide a

maximum of 1A, 3A, or 4A output current. Jumper JU1

sets the maximum current. See Table 2 for a descrip-

tion of the JU1 jumper settings. The EV kit is optimized

for 4A of output current. If the maximum output current

is set lower than 4A and a smaller inductor is desired

due to board space or cost constraints, the following

inductors are suggested for L1: for 3A, the Sumida

CDRH127-330; for 1A, the Sumida CDR105B-330.

Layout Considerations

The MAX1667 EV kit layout is optimized for fast switch-

ing and high currents. The traces connecting the power

components must be able to carry at least 4A. Take

care to ensure that C6 and C12 (the input capacitors),

D1 (the rectifier diode), and C1 and C15 (the output

capacitors) are all connected to GND at a common

point, and to isolate the power GND from the quiet ana-

log GND. Additionally, place the current-sense resistor

as close to the IC as possible to keep the current-sense

traces short, and use Kelvin connections to connect the

current-sense resistor terminals to the CS and BATT

pins of the IC. Because the SMBus communications

line is especially susceptible to noise, the power com-

ponents and SMBus signal traces are strategically

placed on opposite sides of the PC board.

Connecting a Smart Battery

The MAX1667 EV kit includes a five-element terminal

block to facilitate connecting the EV kit to a smart bat-

tery. Refer to the Smart Battery Specification to identify

the type of smart battery connector suited to your appli-

cation. Make sure that the EV kit power is turned off,

_______________________________________________________________________________________

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