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19-1306; Rev 0; 3/98
MAX1662 Evaluation Kit/Evaluation System
General Description
The MAX1662 evaluation system (EV system) consists of a MAX1662 evaluation kit (EV kit) and a companion Maxim SMBusTM 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)TM two-wire interface. Windows 3.1/ Windows 95TM 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. 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
Features
Evaluates: MAX1661/MAX1662/MAX1663
Ordering Information
PART MAX1662EVKIT MAX1662EVSYS INTERFACE TYPE User-Supplied Windows Software IC PACKAGE 10 MAX 10 MAX
Note: The MAX1662 software can be used only with the complete evaluation system MAX1662EVSYS, which includes the MAXSMBUS interface board and the MAX1662EVKIT.
MAX1662EVKIT _____________________Component List
DESIGNATION QTY C1, C2, C3 C4 J1 JU1 LED1, LED2, LED3 R1, R4, R7 R2, R5, R8 R10 R3, R6, R9 P1, P2, P3 SW1 U1 None 0 1 1 1 3 3 3 1 3 3 1 1 1 DESCRIPTION Not installed 0.1F ceramic capacitor 2 x 10 right-angle female receptacle 3-pin jumper Red light-emitting diodes 10k, 5% resistors 200k, 5% resistors 100, 5% resistor 1k, 5% resistors Logic-level, P-channel MOSFETs International Rectifier IRF7406 Slide switch Maxim MAX1662EUB 3 1/2" software disk "MAX1662 Evaluation Kit"
MAX1662EVSYS _____________________Component List
DESIGNATION None None QTY 1 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.
SMBus is a trademark of Intel Corp. Windows is a trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
MAX1662 Evaluation Kit/Evaluation System Evaluates: MAX1661/MAX1662/MAX1663
_________________________Quick Start
Required Equipment
Before you begin, you will need the following equipment: * An IBM PC-compatible computer capable of running Windows 3.1 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 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 _________________________of 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.
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. Make sure switch SW1 on the MAX1662 EV kit is in the "off" position. Connect a +7V to +20V DC power supply to the pads labeled POS9 and GND1 of the SMBus interface board. Make sure JU1 is set to the 1-2 position. 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. 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 3.1 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. Turn the EV kit on by moving SW1 to the "on" position. Start the MAX1662 program by opening its icon in the Program Manager (or Start Menu). When the program prompts you to do so, select the correct parallel port. An auto-detect routine identi-
2) 3)
Main Display
The Normal Configuration and Suspend Configuration boxes allow the user to configure the desired IC register settings. The Normal Register is selected at program start-up. To make changes to the suspend-mode register, click on Suspend Register with the mouse or use the TAB and arrow keys to navigate until the selection is highlighted. Inside the configuration boxes are check-boxes that allow the interrupts to be masked or unmasked and the loads to be toggled on or off. Changes to the configurations can be made only to the register that is currently highlighted. The changes are sent to the IC only after the Write Config button is selected. Switching to the other register before selecting Write Config results in the reset of any changes to the previous condition. The Status Box shows the state of the I/O pins and indicates a thermal shutdown. At program start-up the status box is automatically updated. This feature can be turned on or off with the Automatically Update Status check-box. The Alert Box indicates if an interrupt occurred. When an interrupt condition is generated, a message appears in the alert box: "ALERT! INT = LOW". The alert condition will last until Read Alert is selected. This action reads the alert response address, returns the value of the MAX1662 address, and clears the interrupt.
4) 5)
6)
7) 8) 9)
2
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MAX1662 Evaluation Kit/Evaluation System
Note: The seven most significant bits of the alert box are the address bits. The least significant bit is the read/write status bit. The Reset button will set the MAX1662 and the software to a power-on reset state. If the address is changed on the MAX1662, selecting Reset will also find the new address. If in doubt, select the reset button.
Table 1. JU1 Shunt Settings for SMBus Address
JUMPER STATE GND JU1 Open VCC ADDRESS MAX1661 0100000 0111100 1001000 MAX1662 0100001 0111101 1001001 MAX1663 0100010 0111110 1001010
Evaluates: MAX1661/MAX1662/MAX1663
SMBus Menu
The SMBus menu allows individual SMBus operations such as Read Byte and Write Byte to be performed. When using SMBus menu operations, turn off Automatically Update Status to prevent errors. The SMBus dialog boxes accept numeric data in binary, decimal, or hexadecimal. Hexadecimal numbers must be prefixed by $ or 0x. Binary numbers must be exactly eight digits.
Note: When changing JU1's setting, move switch SW1 off, then on. Also note that the MAX1662 reads the address select pin at device power-up only.
Table 2. External Load Configuration
I/O I/O1 I/O2 I/O3 MOSFET P1 P2 P3 CONNECT LOAD TO PADS D1-GND D2-GND D3-GND CUT TRACE JU4 JU7 JU10
Detailed Description ________________________ of Hardware
The MAX1662 EV kit provides a proven PC board layout to facilitate evaluation of the MAX1662. It requires a power supply and appropriate timing signals to operate. The Maxim SMBus interface board converts signals from the parallel port of a computer to open-drain SMBus clock and data. It also interfaces the alert (ALERT) and suspend (SMBSUS) pins to the computer and supplies power to the MAX1662 EV kit. The MAX1662 EV kit is configured with three P-channel logic-level MOSFET switches. MOSFET P1 is controlled by I/O1 of the MAX1662, P2 by I/O2, and P3 by I/O3. For evaluation purposes each MOSFET drives an LED; however, an external load can be used in place of the LEDs. See the section Driving an External Load. The MAX1662 EV kit is initially set up to switch 5V at 20mA to power three LEDs. Each MOSFET can be reconfigured. For example, disconnecting the MOSFETs from the +5V supply isolates them from each other, making it possible to switch a different voltage with each one. For switching up to 15V, follow the directions under Switching Voltages Higher than 5V. To switch up to 28V, refer to the section Switching 28V.
Table 3. External Power Supply Configuration
I/O I/O1 I/O2 I/O3 MOSFET P1 P2 P3 APPLY VOLTAGE TO PADS S1-GND S2-GND S3-GND CUT TRACE JU3 JU6 JU9
Driving an External Load
To configure an output to drive an external load, remove the LED from the circuit (Table 2). Note: The 5V supplied by the Maxim SMBus interface board is limited to approximately 20mA. If more current is needed, follow the directions listed in Switching Voltages Higher than 5V, and use an external power supply.
Switching Voltages Higher than 5V
To configure an output to switch 15V across the loads, isolate the MOSFETs from the +5V supply and apply an external voltage from MOSFET source to GND (Table 3). Note: The IRF7406 MOSFET has a 20V gate-to-source voltage limit.
Jumper Settings
The 3-pin header JU1 controls the address (pin 6) on the IC (Table 1).
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3
MAX1662 Evaluation Kit/Evaluation System Evaluates: MAX1661/MAX1662/MAX1663
Switching Voltages Lower than 5V
To switch lower voltages, such as 3.3V supply, replace the IRF7406 MOSFETs with devices having lower threshold voltages (such as the IRF7404). In addition, isolate the MOSFET source connections from the +5V supply (Table 3). MOSFETs from the +5V supply. To use I/O1, cut the trace across JU2 and solder an 8.2k resistor in its place. For I/O2 or I/O3, cut the trace across JU5 or JU8, respectively, and solder in a 8.2k resistor.
Note: The MAX1662 has an absolute maximum rating of 30V between I/O and GND.
Switching 28V
The MAX1662 EV kit can switch 28V if a voltage divider is used to prevent the gate-to-source voltage from exceeding the MOSFET's rating. Follow the procedure in Switching Voltages Higher than 5V to isolate the
Configuring the Board for GPIO
To configure the board for general-purpose I/O (GPIO), isolate the MAX1662's I/O pins by cutting PC board traces JU2, JU5, and JU8 and by using the pads labeled I/O1, I/O2, or I/O3.
Table 4. Jumper Function Table
JUMPER STATE 1-2* JU1 2-3 Open JU2 Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* Open Closed (Default Trace)* FUNCTION Address pin connected to VCC. Address pin connected to GND. Address pin floating. Configure for GPIO. Use supplied MOSFET. Use a higher voltage on the MOSFET. Drive MOSFET with the boards 5V. Drive an external load. Use LED1. Configure for GPIO. Use supplied MOSFET. Use a higher voltage on the MOSFET. Drive MOSFET with the boards 5V. Drive an external load. Use LED2. Configure for GPIO. Use supplied MOSFET. Use a higher voltage on the MOSFET. Drive MOSFET with the boards 5V. Drive an external load. Use LED3.
JU3
JU4
JU5
JU6
JU7
JU8
JU9 * Indicates default jumper state. JU10 *Indicates default jumper state.
4
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+5V 2 SW1 CUT HERE 1 VCC JU2 4 R2 200k I/O1 D1 LED1 GND 8 SMBDATA JU6 S2 CUT HERE 7 SMBSUS I/O2 CUT HERE 10 ALERT I/O2 VCC JU7 GND CUT HERE 1 JU1 ADD CUT HERE JU8 CUT HERE J1-2 SMBDATA J1-6 SMBCLK SMBSUS ALERT J1-14 J1-16 J1-18 J1-20 J1-12 J1-10 J1-8 CUT HERE J1-4 I/O3 R7 10k C3 OPEN 4 R8 200k 1, 2, 3 P3 IRF7406 5, 6, 7, 8 D3 JU10 GND R9 1k LED3 3 2 6 JU9 R6 1k S3 R5 200k 3 4 P2 IRF7406 5, 6, 7, 8 JU5 R4 10k C2 OPEN 1, 2, 3 CUT HERE R3 1k JU4 5, 6, 7, 8 P1 IRF7406 CUT HERE R1 10k C1 OPEN 1, 2, 3 3 1 I/O1 2 R10 100 S1 JU3
VCC
C4 0.1F
U1
MAX1662
9 SMBCLK
Figure 1. MAX1662 EV Kit Schematic
D2 LED2 5 GND I/O3 +5V 4
SMBCLK
SMBDATA
SMBSUS
ALERT
GND
J1-1
J1-3
J1-5
J1-7
J1-9
J1-11
J1-13
J1-15
J1-17
MAX1662 Evaluation Kit/Evaluation System
Evaluates: MAX1661/MAX1662/MAX1663
_______________________________________________________________________________________
J1-19
5
MAX1662 Evaluation Kit/Evaluation System Evaluates: MAX1661/MAX1662/MAX1663
1.0"
Figure 2. MAX1662 EV Kit Component Placement Guide
1.0"
Figure 3. MAX1662 EV Kit PC Board Layout--Component Side
6
_______________________________________________________________________________________
MAX1662 Evaluation Kit/Evaluation System Evaluates: MAX1661/MAX1662/MAX1663
1.0"
Figure 4. MAX1662 EV Kit PC Board Layout--Solder Side
_______________________________________________________________________________________
7
MAX1662 Evaluation Kit/Evaluation System Evaluates: MAX1661/MAX1662/MAX1663
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
19-1306; Rev 0; 3/98
Two-Wire Interface Board
________________General Description
MAXSMBus is an interface between an IBM-compatible PC and System Management Bus (SMBus)TMcompatible serial-interface devices such as temperature monitors, voltage regulators, or A/D converters (ADCs). The MAXSMBus interface board is connected between the PC parallel port and the device under test, converting parallel data into two-wire, open-drain serial data. The board is provided for use with selected Maxim products and is not intended to replace commercially available SMBus hardware. MAXSMBus is shipped with a companion EV kit board, including all relevant software.
____________________________Features
o SMBus-Compatible Two-Wire Interface o SMBus Suspend Output o Two SMBus Alert Inputs o Overvoltage Fault Protection o PC Parallel Port Interface
Evaluates: MAXSMBus
_______________Ordering Information
PART MAXSMBus BOARD TYPE Companion Board for SMBus EV Kits
Maxim SMBus Interface Board ____________________________Component List
DESIGNATION QTY C1, C2, C3 C4-C9 D1 D2 D3 J1 J2 P1 R1, R2, R3, R10, R11 R4-R7 R8, R9 U1 U2 U3 U4 U5 U6 U7 NONE 3 6 1 1 1 1 1 1 5 4 2 1 1 1 1 1 1 1 1 DESCRIPTION 0.1F ceramic capacitors 3.3F, 25V tantalum capacitors 1N5235B zener diode, 6.8V 1N5229B zener diode, 4.3V 1N4148 small signal diode DB25 right angle plug Not installed 2 x 10 right angle male header 47k, 5% resistors 4.7k, 5% resistors 1k, 5% resistors 74HC05 hex open-collector inverter 74HC04 hex inverter 74HC08 quad AND gate 74HC74 dual D flip-flop +5V, 100mA regulator, LM78L05ACM MAX865EUA (8 MAX) MAX367CWN (18 SO) PC board
___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.
_______________Detailed Description
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 1). The companion board plugs into a 20-pin dual-row right-angle header at the edge of the board (Table 2). 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.
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
Two-Wire Interface Board Evaluates: MAXSMBus
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.
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 2.
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 100.
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.
________________________________________________________Troubleshooting Guide
SYMPTOMS CAUSE Board not connected to parallel printer port SOLUTION 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. Check power connections on the interface board. Check clock and data signal connections. Try operating the interface board without the companion Maxim evaluation kit--this should cause the address-not-acknowledged symptom described below. Verify that the companion board is connected to the MAXSMBus interface board. Verify that the companion board is powered. If the companion offers a choice of addresses, confirm that the software and hardware addresses match. Some devices only read the address select pins at device power-up. Disable print manager in Windows printer control panel. Disable printer driver. 1) Use computer with commercially available BIOS. 2) Make a bootable floppy disk, remove unnecessary device drivers from A:config.sys, and boot system from floppy.
Can't Find the Interface Board
Clock or Data Stuck Low
Board is connected to correct port, but SMBus is not functioning
Address Not Acknowledged
SMBus is OK, but no response at expected SMBus address
Conflict with local printer driver Erratic Operation Operating system conflict
2
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Two-Wire Interface Board Evaluates: MAXSMBus
Table 1. DB25 Connector Signals
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18-25 NAME SPARE OUTPUT A SMBCLK_ OUT SMBDATA_ OUT SMBUS_OUT LOOPBACK MASK_ ALERT1 MASK_ ALERT2 MASK_ START CAPTURE_ENABLE INT SMBDATA_ IN SMBCLK_ IN LOOPBACK SPARE OUTPUT B HOLDING_ CLOCK UNUSED UNUSED GND Spare output When high, drives SMBCLK signal low When high, drives SMBDATA signal low When high, drives SMBSUS signal low Loopback connection for port verification When high, allows ALERT1 to trigger INT low When high, allows ALERT2 to trigger INT low When high, allows a start condition to trigger INT low When high, enables slave / bus monitor circuitry. This circuit waits until SMBCLK is pulled low, and then it holds SMBCLK until the software resets it. Active low interrupt input When high, indicates that SMBDATA is low When high, indicates that SMBCLK is low Loopback connection for port verification Spare output When low, indicates that interface board is holding SMBCLK low Not used Not used Signal ground return FUNCTION
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3
Two-Wire Interface Board Evaluates: MAXSMBus
Table 2. Right-Angle Header P1 Signals
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 NAME DUT +5V GND DUT SDA GND GND GND DUT SCL GND DUTSMBSUS GND DUTSMBALERT GND DUTALERT2 GND SPARE OUTPUT A GND SPARE OUTPUT B GND GND RAW POWER FUNCTION +5V at 20mA power supply to Maxim companion board Signal ground return SMBDATA interface signal Signal ground return Signal ground return Signal ground return SMBCLK interface signal Signal ground return SMBSUS interface signal Signal ground return Primary ALERT interface signal Signal ground return Secondary ALERT interface signal Signal ground return Spare output from pin 1 of the DB25 connector Signal ground return Spare output from pin 14 of the DB25 connector Signal ground return Signal ground return Unregulated, unprotected power-supply input to MAXSMBus interface board
Note: Odd-numbered pins are on the outer row. Even-numbered pins are on the inner row. All right-angle header signals pass through the MAX367 circuit protector, except 20.
4
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U2E U3A U1C ALERT1 74HC04 J1-6 MASK_ALERT1 74HC05 U3B U1D ALERT2 74HC04 5 74HC08 74HC05 U3C U1E 8 11 OC 74HC05 10 5 START DETECTED Q R 74HC74 U2A 1 74HC04 SMBSUS 2 SMBSUS J1-8 MASK_START 10 74HC08 START_DETECTED 9 6 OC 9 8 INT J1-10 J1-7 MASK_ALERT2 13 ALERT2 12 4 R3 47k 2 74HC08 +5V 3 OC 5 6 R10 47k +5V U2F R11 47k ALERT1 11 10 ALERT1 1
4 S Q CLK D 6 3 2 1
Figure 1. MAXSMBus Schematic
U4A
ALERT2 INTERFACE TEST POINTS HOLDING_CLOCK J2-1 SMBCLK_OUT J2-2 SMBDATA_OUT J2-3 SMBSUS_OUT J2-4 J2-5 J2-6 J2-7 +5V SMBCLK_IN U2B 9 Q R 74HC74 U1A 1 OC +5V 74HC05 U2C 6 74HC04 U1B 3 OC 74HC05 U2D 8 74HC04 9 SMBDATA SMBDATA 4 SMBDATA +5V R2 47k 5 SMBCLK J1-18 J1-19 J1-20 J1-21 J1-22 R1 47k J1-5 LOOPBACK J1-13 2 SMBCLK C1 0.1F C2 0.1F C3 0.1F CAPTURE_ENABLE 13 74HC08 GRAB_SCL 12 3 74HC04 4 DRIVE_SCL_LOW 13 CAPTURE_ENABLE 12 D U3D 11 13 11 CLK U1F OC 74HC05 12 SMBCLK DECOUPLING CAP. +5V Q 8 HOLDING_ CLOCK J1-15 10 S MASK_ALERT1 MASK_ALERT2 MASK_START J2-8 J2-9 J2-10 J2-11 J2-12 CAPTURE_ENABLE INT SMBDATA_IN SMBCLK_IN GND
SMBDATA_IN
SMBCLK
CAPTURE_ENABLE
SMBSUS_DUT J1-4
R7 4.7k
GND
U4B
J1-9
CAPTURE_ENABLE
R4 4.7k
SMBCLK_OUT
J1-2
R5 4.7k
J1-12
SMBCLK_IN
SMBDATA_OUT
J1-3
R6 4.7k
Evaluates: MAXSMBus
_______________________________________________________________________________________
J1-23 J1-24 J1-25
J1-11
SMBDATA_IN
Two-Wire Interface Board
5
Evaluates: MAXSMBus
POS5 R8 1k +10V SBCLK1 D1 6.8V GND SBSUS1 ALERT1 ALERT2 17 16 15 GND P1 2 x 10 RIGHT ANGLE HEADER 5 13 DUT +5V P1-1 P1-3 P1-5 DUT SCL DUT SMBSUS 9 DUT SMBALERT DUT ALERT2 SPARE OUTPUT J1-1 R9 1k SPARE OUTPUT J1-14 D2 4.3V -10V P1-7 P1-9 P1-11 P1-13 P1-15 P1-17 P1-19 +9V DUT SDA 12 11 10 6 J1-1 J1-14 8 7 P1-2 P1-4 P1-6 P1-8 P1-10 P1-12 P1-14 P1-16 P1-18 P1-20 14 GND0 18 SBDAT1
Two-Wire Interface Board
Figure 1. MAXSMBus Schematic (continued)
6
U7 MAX367
+5V SMBDATA SMBCLK SMBSUS ALERT1 ALERT2 4 3 2 1 POS9 +5V D3 C6 3.3F 25V
U6
1 +9V C5 3.3F 25V +10V C4 3.3F 25V +5V
U5 LM78L05ACM
+5V 1 OUT 2 GND 3 GND 4 N.C. 8 +9V IN GND 7 GND 6 5 N.C. C8 3.3F 25V
_______________________________________________________________________________________
C9 3.3F 25V C1+ 2 C2+ 3 C24 V8 C1V+ 7 IN 6 5 GND
MAX865
GND1 C7 3.3F 25V -10V GND
Two-Wire Interface Board Evaluates: MAXSMBus
1.0"
1.0"
Figure 2. MAXSMBus Component Placement Guide
Figure 3. MAXSMBus PC Board Layout--Component Side
_______________________________________________________________________________________
7
Two-Wire Interface Board Evaluates: MAXSMBus
1.0"
Figure 4. MAXSMBus PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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