MAX1662EVKIT

MAX1662EVKIT Datasheet

Evaluates MAX1661/MAX1662/MAX1663

Part	Datasheet
MAX1662EVKIT	MAX1662EVKIT (pdf)

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Evaluates MAX1661/MAX1662/MAX1663 MAX1662 Evaluation Kit/Evaluation System The MAX1662 evaluation system EV system consists of a MAX1662 evaluation kit EV kit and a companion Maxim SMBus Interface Board. The MAX1662 EV kit is an assembled and tested PC board that demonstrates the MAX1662 load-switch controller. In addition to controlling power-plane load switches, the MAX1662 is useful for many different SMBus I/O expansion tasks, such as controlling voltage regulators or detecting the state of mechanical switches. The Maxim SMBus interface board MAXSMBUS allows an IBM-compatible personal computer to use its parallel port to emulate an Intel System Management Bus SMBus two-wire interface. Windows 95 software provide a user-friendly interface to exercise the MAX1662’s features. The program is menu-driven and offers a graphics interface with control buttons and status display. The MAX1662 EV system can also be used to evaluate the MAX1661 or MAX1663. Contact the factory to order a free MAX1661EUB or MAX1663EUB sample. Order the MAX1662EVSYS for complete IBM PC-based evaluation of the MAX1662. Order the MAX1662EVKIT if you already have an SMBus interface. MAX1662EVKIT List DESIGNATION QTY C1, C2, C3 0 DESCRIPTION Not installed 0.1µF ceramic capacitor 2 x 10 right-angle female receptacle 3-pin jumper LED1, LED2, LED3 Red light-emitting diodes R1, R4, R7 R2, R5, R8 R10 R3, R6, R9 3 5% resistors 3 5% resistors 1 5% resistor 3 5% resistors P1, P2, P3 Logic-level, P-channel MOSFETs International Rectifier IRF7406 SW1 U1 1 Slide switch 1 Maxim MAX1662EUB None 3 1/2" software disk “MAX1662 Evaluation Kit” SMBus is a trademark of Intel Corp. Windows is a trademark of Microsoft Corp. o Controls up to Three Load Switches Independently o Configurable for Three General-Purpose Input/Outputs GPIO o Includes Three 30V, 4A P-Channel MOSFET Switches o SMBus Compatible o Easy-to-Use Menu Driven Software o Assembled and Tested Surface-Mount Board Ordering Information PART MAX1662EVKIT MAX1662EVSYS INTERFACE TYPE User-Supplied Windows Software IC PACKAGE 10 µMAX 10 µMAX Note The MAX1662 software can be used only with the complete evaluation system MAX1662EVSYS, which includes the MAXSMBUS interface board and the MAX1662EVKIT. MAX1662EVSYS List DESIGNATION None QTY 1 DESCRIPTION MAX1662EVKIT MAXSMBUS Component Suppliers SUPPLIER* International Rectifier PHONE 310 322-3331 FAX 310 322-3332 *Please indicate that you are using the MAX1662 when contacting International Rectifier. Maxim Integrated Products 1 For free samples & the latest literature or phone For small orders, phone 408-737-7600 ext. MAX1662 Evaluation Kit/Evaluation System Evaluates MAX1661/MAX1662/MAX1663 Start Required Equipment Before you begin, you will need the following equipment: • An IBM PC-compatible computer capable of running Windows or Windows 95 • A spare parallel printer port this is a 25-pin socket on the back of the computer • A standard 25-pin, straight-through, male-to-female cable to connect the computer’s parallel port to the Maxim SMBus interface board • A small DC power supply capable of supplying 7V to 20V at 100mA Procedure 1 Carefully connect the boards by aligning the 20-pin connector of the MAX1662 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. 2 Make sure switch SW1 on the MAX1662 EV kit is in the “off” position. 3 Connect a +7V to +20V DC power supply to the pads labeled POS9 and GND1 of the SMBus interface board. 4 Make sure JU1 is set to the 1-2 position. 5 Connect a cable from the computer’s parallel port to the SMBus interface board. Use a straightthrough 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. 6 Run the MAX1662.EXE software program from either the floppy drive or the hard drive. Simply use the Windows Program Manager to run the program. If desired, you may use the INSTALL.EXE program to copy the files and create icons for them in the Windows Program Manager or the Windows 95 Start Menu . An uninstall program is included with the software. Simply click on the UNINSTALL icon to remove the MAX1662 EV kit software from the hard drive. 7 Turn the EV kit on by moving SW1 to the “on” position. 8 Start the MAX1662 program by opening its icon in the Program Manager or Start Menu . 9 When the program prompts you to do so, select the correct parallel port. An auto-detect routine identi- fies the port to which the EV kit is connected, and selects it as the default choice by highlighting it. Verify that the correct port is highlighted then select “OK”. 10 Observe as the program automatically detects the address of the MAX1662 and starts the main program. Detailed Description Software The software allows you to select between the IC’s normal and suspend-mode registers. Configuration boxes allow for all interrupts except Thermal Shutdown to be individually masked or unmasked and the three MOSFET switches to be independently switched on or off. A status box indicates the states of the I/O pins and is automatically updated several times a second. The automatic update feature can be turned off and the status updated manually. Note In the following sections, words in bold face are user-selectable features in the software. Ordering Information PART MAXSMBus BOARD TYPE Companion Board for SMBus EV Kits Maxim SMBus Interface Board List DESIGNATION QTY C1, C2, C3 3 0.1µF ceramic capacitors 6 3.3µF, 25V tantalum capacitors 1 1N5235B zener diode, 6.8V 1 1N5229B zener diode, 4.3V 1 1N4148 small signal diode 1 DB25 right angle plug 1 Not installed 1 2 x 10 right angle male header R1, R2, R3, R10, R11 5% resistors R8, R9 U1 U2 U3 U4 U5 U6 U7 NONE 4 5% resistors 2 5% resistors 1 74HC05 hex open-collector inverter 1 74HC04 hex inverter 1 74HC08 quad AND gate 1 74HC74 dual D flip-flop 1 +5V, 100mA regulator, LM78L05ACM 1 MAX865EUA 8 µMAX 1 MAX367CWN 18 SO 1 PC board SMBus is a trademark of Intel Corp. ___MAXSMBus Functionality Check Follow these steps to verify that the MAXSMBus interface board is functioning properly. All necessary software is supplied on a disk with the companion EV kit. Instructions for operating the software are included in the EV kit manual. 1 Connect a +9V DC supply +7V minimum, +20V maximum to the MAXSMBus interface board at the terminals labeled “POS9” and “GND” in the lower left corner of the board. 2 Use a digital voltmeter to verify that the oval pad labeled “POS5” is +5V +4.75V minimum, +5.25V maximum . Also verify that the pads labeled “SBDAT1,” “SBCLK1,” “SBSUS1,” “ALERT1,” and “ALERT2” are above +4V. 3 If these DC voltages are correct, MAXSMBus passes the functionality test. The MAXSMBus interface board provides all of the interface signals necessary to interface an IBM PCcompatible computer with an SMBus-compliant device. A DB25 right-angle plug connects to the computer Table The companion board plugs into a 20-pin dual-row right-angle header at the edge of the board Table Alternatively, connection can be made by soldering wires to the oval pads as appropriate. This allows the companion board to be placed in an environmental chamber for evaluation over temperature. Refer to the documentation of the companion Maxim EV kit for quick start and operating instructions. Maxim Integrated Products 1 For free samples & the latest literature or phone For small orders, phone 408-737-7600 ext. Evaluates MAXSMBus Two-Wire Interface Board Power Supply The interface board is powered by a 78L05 linear regulator. The companion board can draw about 20mA of +5V power through the circuit protector. Companion boards that require more power must provide their own regulator. The unregulated input to the 78L05 is available on the right-angle header. Fault Protection Circuitry Overvoltage fault protection is provided by a MAX367 fault protector U7 . If any of the SMBus interface signals exceed the MAX367’s power supply rails, the MAX367 increases its resistance to prevent damage to the user’s computer. A MAX865 dual charge pump U6 and two zener diodes D1 and D2 provide +7V and -3V supplies to the MAX367, thus allowing 0V and +5V signals to pass with a nominal resistance of Bus Driving Circuitry A 74HC05 open-drain inverter U1 is used to pull down the SMBus interface signals. The 74HC08 U3 , 74HC74 U4 , and 74HC04 U2 buffer the signal to the IBM PC and provide the capability to mask the ALERT interrupts, detect an externally generated start condition, and capture data sent by an external bus master. Interface connections are listed in Table 1 and Table Bus Monitoring Circuitry Flip-flop U4A detects the start condition falling edge of SMBDATA when SMBCLK is high . Flip-flop U4B detects the falling SMBCLK edge when enabled, and U1F holds SMBCLK low until the software releases it. To advance to the next data bit, the software uses U1A to assert and then release SMBCLK. A logic high at the input of U1A also resets flip-flop U4B. Because the IBM PC parallel port has a limited number of inputs, the start-detect circuit and the two alert inputs share a single interrupt input. The source of the interrupt is distinguished using U3A, U3B, and U3C. Guide SYMPTOMS CAUSE SOLUTION Can’t Find the Interface Board Board not connected to parallel printer port Verify that the cable is a 25-pin parallel port I/O extension cable with a plug on one end and a socket on the other end. Verify that the cable is connected to a printer port, not a floppy disk, SCSI, or serial communications port.

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Evaluates MAX1661/MAX1662/MAX1663

MAX1662 Evaluation Kit/Evaluation System

The MAX1662 evaluation system EV system consists of a MAX1662 evaluation kit EV kit and a companion Maxim SMBus Interface Board. The MAX1662 EV kit is an assembled and tested PC board that demonstrates the MAX1662 load-switch controller.

In addition to controlling power-plane load switches, the MAX1662 is useful for many different SMBus I/O expansion tasks, such as controlling voltage regulators or detecting the state of mechanical switches.

The Maxim SMBus interface board MAXSMBUS allows an IBM-compatible personal computer to use its parallel port to emulate an Intel System Management Bus SMBus two-wire interface. Windows 95 software provide a user-friendly interface to exercise the MAX1662’s features. The program is menu-driven and offers a graphics interface with control buttons and status display.

The MAX1662 EV system can also be used to evaluate the MAX1661 or MAX1663. Contact the factory to order a free MAX1661EUB or MAX1663EUB sample.

Order the MAX1662EVSYS for complete IBM PC-based evaluation of the MAX1662.

Order the MAX1662EVKIT if you already have an SMBus interface.

MAX1662EVKIT List

DESIGNATION QTY

C1, C2, C3 0

DESCRIPTION Not installed 0.1µF ceramic capacitor 2 x 10 right-angle female receptacle 3-pin jumper

LED1, LED2, LED3

Red light-emitting diodes

R1, R4, R7 R2, R5, R8

R10 R3, R6, R9
3 5% resistors 3 5% resistors 1 5% resistor 3 5% resistors

P1, P2, P3

Logic-level, P-channel MOSFETs International Rectifier IRF7406

SW1 U1
1 Slide switch 1 Maxim MAX1662EUB

None
3 1/2" software disk “MAX1662 Evaluation Kit”

SMBus is a trademark of Intel Corp. Windows is a trademark of Microsoft Corp.
o Controls up to Three Load Switches Independently
o Configurable for Three General-Purpose Input/Outputs GPIO
o Includes Three 30V, 4A P-Channel MOSFET Switches
o SMBus Compatible o Easy-to-Use Menu Driven Software o Assembled and Tested Surface-Mount Board
Ordering Information

PART MAX1662EVKIT MAX1662EVSYS

INTERFACE TYPE User-Supplied Windows Software

IC PACKAGE 10 µMAX 10 µMAX

Note The MAX1662 software can be used only with the complete evaluation system MAX1662EVSYS, which includes the MAXSMBUS interface board and the MAX1662EVKIT.

MAX1662EVSYS List

DESIGNATION None

QTY 1

DESCRIPTION MAX1662EVKIT MAXSMBUS

Component Suppliers

SUPPLIER*

International Rectifier

PHONE 310 322-3331

FAX 310 322-3332
*Please indicate that you are using the MAX1662 when contacting International Rectifier.

Maxim Integrated Products 1

For free samples & the latest literature or phone For small orders, phone 408-737-7600 ext.

MAX1662 Evaluation Kit/Evaluation System

Evaluates MAX1661/MAX1662/MAX1663

Start

Required Equipment Before you begin, you will need the following equipment:
• An IBM PC-compatible computer capable of running Windows or Windows 95
• A spare parallel printer port this is a 25-pin socket on the back of the computer
• A standard 25-pin, straight-through, male-to-female cable to connect the computer’s parallel port to the Maxim SMBus interface board
• A small DC power supply capable of supplying 7V to 20V at 100mA

Procedure 1 Carefully connect the boards by aligning the 20-pin
connector of the MAX1662 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.
2 Make sure switch SW1 on the MAX1662 EV kit is in the “off” position.
3 Connect a +7V to +20V DC power supply to the pads labeled POS9 and GND1 of the SMBus interface board.
4 Make sure JU1 is set to the 1-2 position.
5 Connect a cable from the computer’s parallel port to the SMBus interface board. Use a straightthrough 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.
6 Run the MAX1662.EXE software program from either the floppy drive or the hard drive. Simply use the Windows Program Manager to run the program. If desired, you may use the INSTALL.EXE program to copy the files and create icons for them in the Windows Program Manager or the Windows 95 Start Menu . An uninstall program is included with the software. Simply click on the UNINSTALL icon to remove the MAX1662 EV kit software from the hard drive.
7 Turn the EV kit on by moving SW1 to the “on” position.
8 Start the MAX1662 program by opening its icon in the Program Manager or Start Menu .
9 When the program prompts you to do so, select the correct parallel port. An auto-detect routine identi-
fies the port to which the EV kit is connected, and selects it as the default choice by highlighting it. Verify that the correct port is highlighted then select “OK”.
10 Observe as the program automatically detects the address of the MAX1662 and starts the main program.

Detailed Description

Software

The software allows you to select between the IC’s normal and suspend-mode registers. Configuration boxes allow for all interrupts except Thermal Shutdown to be individually masked or unmasked and the three MOSFET switches to be independently switched on or off. A status box indicates the states of the I/O pins and is automatically updated several times a second. The automatic update feature can be turned off and the status updated manually.

Note In the following sections, words in bold face are user-selectable features in the software.
Ordering Information

PART MAXSMBus

BOARD TYPE Companion Board for SMBus EV Kits

Maxim SMBus Interface Board List

DESIGNATION QTY

C1, C2, C3 3 0.1µF ceramic capacitors
6 3.3µF, 25V tantalum capacitors
1 1N5235B zener diode, 6.8V
1 1N5229B zener diode, 4.3V
1 1N4148 small signal diode
1 DB25 right angle plug
1 Not installed
1 2 x 10 right angle male header

R1, R2, R3, R10, R11
5% resistors

R8, R9

U1 U2 U3 U4 U5 U6 U7 NONE
4 5% resistors 2 5% resistors 1 74HC05 hex open-collector inverter 1 74HC04 hex inverter 1 74HC08 quad AND gate 1 74HC74 dual D flip-flop 1 +5V, 100mA regulator, LM78L05ACM 1 MAX865EUA 8 µMAX 1 MAX367CWN 18 SO 1 PC board

SMBus is a trademark of Intel Corp.
___MAXSMBus Functionality Check

Follow these steps to verify that the MAXSMBus interface board is functioning properly. All necessary software is supplied on a disk with the companion EV kit. Instructions for operating the software are included in the EV kit manual.
1 Connect a +9V DC supply +7V minimum, +20V maximum to the MAXSMBus interface board at the terminals labeled “POS9” and “GND” in the lower left corner of the board.
2 Use a digital voltmeter to verify that the oval pad labeled “POS5” is +5V +4.75V minimum, +5.25V maximum . Also verify that the pads labeled “SBDAT1,” “SBCLK1,” “SBSUS1,” “ALERT1,” and “ALERT2” are above +4V.
3 If these DC voltages are correct, MAXSMBus passes the functionality test.

The MAXSMBus interface board provides all of the interface signals necessary to interface an IBM PCcompatible computer with an SMBus-compliant device. A DB25 right-angle plug connects to the computer Table The companion board plugs into a 20-pin dual-row right-angle header at the edge of the board Table Alternatively, connection can be made by soldering wires to the oval pads as appropriate. This allows the companion board to be placed in an environmental chamber for evaluation over temperature.

Refer to the documentation of the companion Maxim EV kit for quick start and operating instructions.

Maxim Integrated Products 1

For free samples & the latest literature or phone For small orders, phone 408-737-7600 ext.

Evaluates MAXSMBus

Two-Wire Interface Board

Power Supply The interface board is powered by a 78L05 linear regulator. The companion board can draw about 20mA of +5V power through the circuit protector. Companion boards that require more power must provide their own regulator. The unregulated input to the 78L05 is available on the right-angle header.

Fault Protection Circuitry Overvoltage fault protection is provided by a MAX367 fault protector U7 . If any of the SMBus interface signals exceed the MAX367’s power supply rails, the MAX367 increases its resistance to prevent damage to the user’s computer. A MAX865 dual charge pump U6 and two zener diodes D1 and D2 provide +7V and -3V supplies to the MAX367, thus allowing 0V and +5V signals to pass with a nominal resistance of

Bus Driving Circuitry A 74HC05 open-drain inverter U1 is used to pull down the SMBus interface signals. The 74HC08 U3 , 74HC74 U4 , and 74HC04 U2 buffer the signal to the IBM PC and provide the capability to mask the ALERT interrupts, detect an externally generated start condition, and capture data sent by an external bus master. Interface connections are listed in Table 1 and Table

Bus Monitoring Circuitry Flip-flop U4A detects the start condition falling edge of SMBDATA when SMBCLK is high . Flip-flop U4B detects the falling SMBCLK edge when enabled, and U1F holds SMBCLK low until the software releases it. To advance to the next data bit, the software uses U1A to assert and then release SMBCLK. A logic high at the input of U1A also resets flip-flop U4B. Because the IBM PC parallel port has a limited number of inputs, the start-detect circuit and the two alert inputs share a single interrupt input. The source of the interrupt is distinguished using U3A, U3B, and U3C.

Guide

SYMPTOMS

CAUSE

SOLUTION

Can’t Find the Interface Board

Board not connected to parallel printer port

Verify that the cable is a 25-pin parallel port I/O extension cable with a plug on one end and a socket on the other end. Verify that the cable is connected to a printer port, not a floppy disk, SCSI, or serial communications port.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MAX1662EVKIT Datasheet file may be downloaded here without warranties.

Datasheet ID: MAX1662EVKIT 647246