MAX1645EVKIT [MAXIM]

Evaluation Kit for the MAX1645 ; 评估板MAX1645\n


型号：	MAX1645EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Evaluation Kit for the MAX1645 评估板MAX1645\n
文件：	总8页 (文件大小：192K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-1596; Rev 0; 3/00

MAX1645 Evaluation System

General Description

Features

The MAX1645 evaluation system (EV system) consists of

a MAX1645 evaluation kit (EV kit) and a companion

Maxim System Management Bus (SMBus™) interface

board. The EV kit simplifies evaluation of the MAX1645

chemistry-independent Level 2 smart battery charger.

ꢀ Charges Any Battery Chemistry: Li-Ion, NiCd,

NiMH, Lead Acid, etc.

ꢀ SMBus-Compatible 2-Wire Serial Interface

ꢀ 3A max Battery Charge Current

ꢀ Up to 18.4V Battery Voltage

The Maxim SMBus interface board (MAXSMBus) allows

an IBM-compatible personal computer to use its paral-

lel port to emulate an Intel SMBus 2-wire interface.

Windows 95/98^®software provides a user-friendly inter-

face to exercise the MAX1645’s features.

ꢀ Up to +28V Input Voltage

ꢀ Easy-to-Use Software Included

ꢀ Proven PC Board Layout

Order the MAX1645EVSYS for complete IBM PC-based

evaluation of the MAX1645. Order the MAX1645EVKIT if

you already have an SMBus interface.

ꢀ Fully Assembled and Tested Surface-Mount Board

EV System

Component List

Ordering Information

DESIGNATION QTY

DESCRIPTION

MAX1645 EV kit

MAXSMBus interface

PART

TEMP. RANGE

0°C to +70°C

IC PACKAGE

28 QSOP

None

MAX1645EVKIT

MAX1645EVSYS

28 QSOP

EV Kit Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

2x10 right-angle female header

5-element terminal block

2-pin headers

22µF, 35V low-ESR tantalum caps

AVX TPSE226M035R0300

C1, C2

C3, C4

JU1, JU2, JU3

22µF, 25V low-ESR tantalum caps

AVX TPSD226M025R0200

22µH, 3.6A inductor

Sumida CDRH127-220

LED1

1µF, 50V ceramic capacitors (1210)

Murata GRM42-2X7R105K050

C5, C19, C20

C6, C7, C12

Red LED

1µF, 10V ceramic capacitors (0805)

Taiyo Yuden LMK212BJ105MG

30V, 11.5A N-channel MOSFET

Fairchild FDS6680

C8, C14, C15,

C16

0.1µF, 16V ceramic capacitors (0603)

Taiyo Yuden EMK107BJ104MA

30V, 8.4A N-channel MOSFET

Fairchild FDS6612A

P1, P2

C9, C10, C11

C13

0.01µF ceramic capacitors (0603)

1500pF ceramic capacitor (0603)

30V, 11A P-channel MOSFETs

Fairchild FDS6675

0.1µF, 50V ceramic capacitors (0805)

Taiyo Yuden UMK212BJ104MG

0.040Ω 1ꢀ, 0.5W resistor

Dale WSL-2010/0.040Ω/1ꢀ

C18, C23, C24

D1, D2

40V, 2A Schottky diodes

Central Semiconductor CMSH2-40

0.050Ω 1ꢀ, 0.5W resistor

Dale WSL-2010/0.050Ω/1ꢀ

R3, R4

100kΩ 1ꢀ resistors (0603)

10kΩ 5ꢀ resistors (0603)

10kΩ 1ꢀ resistor (0603)

Schottky diodes (SOT23)

Central Semiconductor CMPSH-3

D3, D4

R5, R7, R9,

R10, R17

SMBus is a registered trademark of Intel Corp.

Windows 95/98 are registered trademarks of Microsoft Corp.

________________________________________________________________ Maxim Integrated Products

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

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

MAX1645 Evaluation System

EV Kit Component List (cont.)

Table 1. Jumper Functions

DESIGNATION QTY

DESCRIPTION

1kΩ 5ꢀ resistors (0603)

1Ω 5ꢀ resistors (0603)

33Ω 5ꢀ resistor (0603)

4.7Ω 5ꢀ resistors (0603)

MAX1645EEI (28-pin QSOP)

Shunts (JU1, JU2, JU3)

MAX1645 PC board

JUMPER

STATE

FUNCTION

R8, R13

R11, R16

R12

SCL pulled up to V

through

Closed*

a 10kΩ resistor.

JU1

SCL not pulled up to V

SCL must be pulled up to

external supply.

;

Open

Closed*

Open

R14, R15

SDA pulled up to V

through

None

a 10kΩ resistor.

None

JU2

JU3

SDA not pulled up to V

SDA must be pulled up to

external supply.

;

None

MAX1645 data sheet

None

MAX1645 EV kit data sheet

MAX1645 EV kit software disk

None

10kΩ resistor connected

between thermistor and ground

nodes, simulating the attach-

ment of a smart battery.

Closed*

Open

Component Suppliers

10kΩ resistor disconnected;

for use when an actual smart

battery will be connected to

the EV kit.

SUPPLIER

PHONE

FAX

AVX

803-946-0690

803-626-3123

Central

Semiconductor

516-435-1110

516-435-1824

*Indicates default jumper setting

Dale

402-564-3131

408-822-2000

814-237-1431

847-956-0666

408-573-4150

402-563-6418

408-822-2102

814-238-0490

847-956-0702

408-573-4159

Procedure

Fairchild

Murata

See Figure 1 as you follow these steps:

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

connector of the MAX1645 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.

Sumida

Taiyo Yuden

Note: Please indicate that you are using the MAX1645 when

contacting the above component suppliers.

2) Verify that jumpers JU1, JU2, and JU3 are all

shunted. JU1 and JU2 pull up the SMBus clock and

Quick Start

Required Equipment

Before you begin, you will need the following equip-

ment:

data lines to the V

supply. JU3 connects a 10kΩ

resistor between the ground and thermistor nodes,

making it appear to the MAX1645 as if a smart battery

were connected. Table 1 describes the jumper func-

tions.

• IBM PC-compatible computer capable of running

Windows 95/98

Caution: Do not turn on the power until all connec-

tions are made.

• Parallel printer port (this is a 25-pin socket on the

back of the computer)

3) Connect a +20VDC to +28VDC power supply

between the VIN pad and the adjacent GND pad on

the MAX1645 EV kit board.

• Standard 25-pin, straight-through, male-to-female

cable to connect the computer’s parallel port to the

Maxim SMBus interface 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.

• DC power supply capable of supplying +20V to

+28V at 3A

Note: Do not connect a power supply to the

MAXSMBus board. Power is supplied through the

MAX1645 EV kit board.

_______________________________________________________________________________________

MAX1645 Evaluation System

TO PC

PARALLEL PORT

DC POWER SUPPLY

MAXSMBus

MAX1645 EVALUATION KIT

LOAD

GND VIN

REF

JU1

BATT

GND

JU2

JU3

LED1

(+)

(-)

SMART BATTERY

Figure 1. Block Diagram of MAX1645 EV System

_______________________________________________________________________________________

MAX1645 Evaluation System

5) Install the MAX1645 EV kit software on your comput-

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

py disk. This program copies the MAX1645 program

file and creates an icon for it.

device. The software enables the command panel

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

allowed SMBus commands to the MAX1645. Refer to

the MAX1645 data sheet for more information regarding

the allowed SMBus commands.

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

7) Start the MAX1645 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, signifying

that communication between the PC and the

MAX1645 has been established.

Command Panel

ChargingVoltage()

To issue the ChargingVoltage() command to the

MAX1645, enter the desired voltage, in millivolts, into the

Charging Voltage text edit box and select the adjacent

[Send] button. By default, the software issues the

ChargingVoltage() command three times a second. To

enable/disable this feature, check/uncheck the Voltage

Polling checkbox. If a smart battery is connected to the

charger, the Charging Voltage value displayed will be

identical to the value being broadcast by the smart bat-

tery.

8) The software should appear as shown in Figure 2.

Verify that Charging Voltage = 65535mV, Charging

Current = 128mA; HOT_STOP is checked; Voltage

Polling, Current Polling, and Status Polling are

checked; and the following checkboxes are checked

in the Charger Status panel: VOLTAGE_NOTREG,

VOLTAGE_OR, BATTERY_PRESENT, and AC_PRE-

SENT.

ChargingCurrent()

To issue the ChargingCurrent() command to the

MAX1645, enter the desired current, in milliamps, into

the Charging Current text edit box and select the adja-

cent [Send] button. By default, the software issues the

ChargingCurrent() command three times a second. To

Detailed Description

of Software

Upon execution of the MAX1645 program, the software

automatically resolves the SMBus address of the

Figure 2. MAX1645 EV Kit Software Command Panel

_______________________________________________________________________________________

MAX1645 Evaluation System

enable/disable this feature, check/uncheck the Current

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 sys-

tem, is connected to all the devices and then pulled up

Polling checkbox. If a smart battery is connected to the

charger, the Charging Current value displayed will be

identical to the value being broadcast by the smart bat-

tery.

to V . 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.

Note that when either Voltage Polling or Current

Polling are checked, the action of issuing the

ChargingVoltage() or ChargingCurrent() commands

automatically services the watchdog timer. If both of

these checkboxes are unchecked, the watchdog timer

will eventually time out and charging will stop. For more

information about the watchdog timer, refer to the

MAX1645 data sheet. If the watchdog timer period of

175s is exceeded, reset the watchdog timer by issuing

both the ChargingVoltage() and ChargingCurrent()

commands.

AlarmWarning()

To issue the AlarmWarning() command to the

MAX1645, select the [Alarm Warning] button. This

operation sends the AlarmWarning() command byte

with a data word of 0x8000.

ChargerMode()

To issue the ChargerMode() command to the MAX1645,

select a combination of checkboxes in the Charger

Mode panel of commands. Check the checkboxes next

to commands for which the software should write a 1,

uncheck the checkboxes next to commands for which

the software should write a 0, and then select the [Send]

button.

ChargerSpecInfo()

To issue the ChargerSpecInfo() command to the

MAX1645, select the [Spec Info] button. The response

of the MAX1645 is displayed to the right of the [Spec

Info] button.

ChargerStatus()

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

the Status Polling checkbox and the Charger Status

panel. If the Status 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 Status

Polling checkbox disables automatic software polling.

If polling is disabled, the user can issue the

ChargerStatus() command to the MAX1645 by select-

ing the [Charger Status] button, which is adjacent to

the Status Polling checkbox.

Communication with a Smart Battery

If a smart battery is connected to the MAX1645 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

AlertResponse()

The MAX1645 has an external interrupt pin that is

polled by the software if the Status 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.

Figure 3. MAX1645 EV Kit Smart Battery Window

_______________________________________________________________________________________

MAX1645 Evaluation System

automatically polls the status of the smart battery, and

Connecting an Electronic Load

If a smart battery is unavailable, an electronic load can

be connected across the BATT and GND pads on the

MAX1645 EV kit board. Make sure that the EV kit power

is turned off before connecting a load. Make sure that

JU3 is shunted, making it appear to the MAX1645 as if

a smart battery were connected. 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 MAX1645 with a charging voltage

of 12V at the maximum charging current. Verify that the

MAX1645 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 MAX1645 transitions from current regu-

lation to voltage regulation; as the electronic load voltage

increases beyond 12V, the BATT voltage should remain

fixed at 12V.

the parameters displayed in the smart battery window

always represent the current status of the smart battery.

If polling is disabled, manually query the smart battery

by selecting the [Update] button. When finished, select

the [Done] button to return to the main MAX1645 user

interface window.

Serial Communications Interface

When the user issues a command, the MAX1645 soft-

ware first determines the command byte, then, if the

command is a Write-Word type, the data word corre-

sponding to the selected function. The software and

MAX1645 device communicate serially through the

MAXSMBus board. Refer to the MAX1645 data sheet

for more information regarding the serial communica-

tions protocol.

Detailed Description

of Hardware

Layout Considerations

The MAX1645 EV kit layout is optimized for fast switching

and high currents. The traces connecting the power

components must be able to carry at least 3A. Take

care to ensure that C1 and C2 (the input capacitors),

D2 and N2 (the synchronous rectifier), and C3 and C4

(the output capacitors) are all connected to GND at a

common point, and to isolate the power GND from the

quiet analog GND.

Input Current Limiting

The MAX1645 EV kit is configured to regulate the battery

current so that the total V input current does not

exceed 2.5A. If a load is connected across the LOAD

and GND pads (another system power supply, for

example) that would cause the total current from V to

exceed 2.5A, the MAX1645 will automatically decrease

its charging current to regulate the input current to

2.5A. Refer to the MAX1645 data sheet for more infor-

mation regarding input current limiting.

Connecting a Smart Battery

The MAX1645 EV kit includes a five-element terminal

block to facilitate connecting the EV kit to a smart battery.

Refer to the smart battery specification to identify the

type of smart battery connector suited to your application.

Make sure that the EV kit power is turned off, and connect

the (+), C, D, T, and (-) terminals from the EV kit board

to the smart battery connector using no more than 2

inches of wire. Remove the JU3 shunt, attach a smart

battery to the smart battery connector, and turn the EV

kit power back on. See Figure 1 if necessary.

_______________________________________________________________________________________

MAX1645 Evaluation System

1µF

50V

= 3A TRACES

R13

R14

4.7Ω

C23

0.1µF

50V

LDO

CVS

PDS

DCIN

C20

1µF

50V

LDO

R15

4.7Ω

0.040Ω

1µF

CSSP

CSSN

BST

GND

REF

1/2W

C19

1µF 50V

22µF

35V

22µF

35V

REF

C14

0.1µF

1µF

DHI

100k

MAX1645

R12

33Ω

CLS

DAC

C15

0.1µF

LDO

DLOV

0.1µF

100k

C16

0.1µF

DLO

22µH

CCV

CCI

10k

PGND

R11

1Ω

C10

0.01µF

C18

CSIP

CSIN

PDL

CCS

LOAD

0.050Ω

R16

1Ω

0.1µF

C11

0.01µF

50V

1/2W

C24

0.1µF

50V

H1-1

H1-2

H1-4

H1-5

H1-6

C12

1µF

10k

C13

1500pF

THM

INT

BATT

SDA

BATT

10k

SCL

22µF

25V

H1-3

H1-7

GND

1k LED1

JU3

LOAD

(+)

(-)

10k

R17

10k

H1-20

JU1

JU2

R10

10k

Figure 4. MAX1645 EV Kit Schematic

_______________________________________________________________________________________

MAX1645 Evaluation System

1.0"

Figure 5. MAX1645 EV Kit Component Placement Guide—

Component Side

Figure 6. MAX1645 EV Kit Component Placement Guide—

Solder Side

1.0"

Figure 7. MAX1645 EV Kit PC Board Layout—Component Side

Figure 8. MAX1645 EV Kit PC Board Layout—Solder Side

_______________________________________________________________________________________

MAX1645EVKIT [MAXIM]

相关型号：

MAX1645EVSYSTEM

MAX1647

MAX1647-MAX1648

MAX1647EAP

MAX1647EAP+

MAX1647EAP+T

MAX1647EAP-T

MAX1648

MAX1648ESE

MAX1648ESE+T

MAX1648ESE-T

MAX1649