MAX1662EVKIT

19-1306; Rev 0; 3/98 MAX1662 Evaluation Kit/Evaluation System Order the MAX1662EVSYS for complete IBM PC-based evaluation of the MAX1662. Features ♦ Controls up to Three Load Switches Independently ♦ Configurable for Three General-Purpose Input/Outputs (GPIO) ♦ Includes Three 30V, 4A P-Channel MOSFET Switches ♦ SMBus Compatible ♦ Easy-to-Use Menu Driven Software ♦ Assembled and Tested Surface-Mount Board Ordering Information PART INTERFACE TYPE IC PACKAGE MAX1662EVKIT User-Supplied 10 µMAX MAX1662EVSYS Windows Software 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. Order the MAX1662EVKIT if you already have an SMBus interface. MAX1662EVKIT _____________________Component List DESIGNATION QTY MAX1662EVSYS _____________________Component List DESCRIPTION DESIGNATION QTY 0.1µF ceramic capacitor None 1 MAX1662EVKIT None 1 MAXSMBUS C1, C2, C3 0 Not installed C4 1 J1 1 2 x 10 right-angle female receptacle JU1 1 3-pin jumper LED1, LED2, LED3 3 Red light-emitting diodes R1, R4, R7 3 10kΩ, 5% resistors R2, R5, R8 3 200kΩ, 5% resistors R10 1 100Ω, 5% resistor R3, R6, R9 3 1kΩ, 5% resistors P1, P2, P3 3 Logic-level, P-channel MOSFETs International Rectifier IRF7406 SW1 1 Slide switch U1 1 Maxim MAX1662EUB None 1 3 1/2" software disk “MAX1662 Evaluation Kit” DESCRIPTION Component Suppliers SUPPLIER* International Rectifier PHONE FAX (310) 322-3331 (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. Evaluates: MAX1661/MAX1662/MAX1663 General Description 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 3.1/ 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. Evaluates: MAX1661/MAX1662/MAX1663 MAX1662 Evaluation Kit/Evaluation System _________________________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 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. 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). 6) 7) 8) 9) 2 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 _________________________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. 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. _______________________________________________________________________________________ MAX1662 Evaluation Kit/Evaluation System Table 1. JU1 Shunt Settings for SMBus Address JUMPER STATE JU1 VCC 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. 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. Jumper Settings The 3-pin header JU1 controls the address (pin 6) on the IC (Table 1). ADDRESS MAX1661 MAX1662 MAX1663 GND 0100000 0100001 0100010 Open 0111100 0111101 0111110 1001000 1001001 1001010 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 MOSFET CONNECT LOAD TO PADS CUT TRACE I/O1 P1 D1-GND JU4 I/O2 P2 D2-GND JU7 I/O3 P3 D3-GND JU10 Table 3. External Power Supply Configuration I/O MOSFET APPLY VOLTAGE TO PADS CUT TRACE I/O1 P1 S1-GND JU3 I/O2 P2 S2-GND JU6 I/O3 P3 S3-GND 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. _______________________________________________________________________________________ 3 Evaluates: MAX1661/MAX1662/MAX1663 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. Evaluates: MAX1661/MAX1662/MAX1663 MAX1662 Evaluation Kit/Evaluation System 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 8.2kΩ resistor in its place. For I/O2 or I/O3, cut the trace across JU5 or JU8, respectively, and solder in a 8.2kΩ 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 JU1 JU2 JU3 JU4 JU5 JU6 JU7 JU8 JU9 * Indicates default jumper state. JU10 STATE FUNCTION 1–2* Address pin connected to VCC. 2–3 Address pin connected to GND. Open Address pin floating. Open Configure for GPIO. 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)* 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. *Indicates default jumper state. 4 _______________________________________________________________________________________ _______________________________________________________________________________________ GND ALERT SMBSUS SMBDATA SMBCLK 3 1 2 SMBSUS ALERT J1–9 J1–11 J1–19 J1–17 J1–15 J1–13 J1–8 SMBCLK J1–7 SMBSUS SMBDATA ALERT GND J1–12 J1–20 J1–18 J1–16 J1–14 U1 MAX1662 SMBCLK VCC ADD J1–10 J1–6 J1–5 J1–4 5 6 J1–2 SMBDATA JU1 VCC 10 7 8 9 1 C4 0.1µF J1–3 1 R10 100Ω VCC J1–1 +5V 3 SW1 2 I/O3 I/O2 I/O1 4 3 2 CUT HERE JU8 CUT HERE JU9 CUT HERE JU5 CUT HERE JU6 CUT HERE JU2 CUT HERE JU3 I/O3 R8 200k R7 10k I/O2 R5 200k R4 10k I/O1 R2 200k R1 10k 4 C3 OPEN 4 C2 OPEN 4 C1 OPEN CUT HERE JU10 5, 6, 7, 8 P3 IRF7406 1, 2, 3 CUT HERE JU7 5, 6, 7, 8 P2 IRF7406 1, 2, 3 CUT HERE JU4 5, 6, 7, 8 P1 IRF7406 1, 2, 3 R9 1k R6 1k S2 D3 S3 D2 R3 1k D1 S1 LED3 LED2 LED1 GND GND GND Evaluates: MAX1661/MAX1662/MAX1663 +5V MAX1662 Evaluation Kit/Evaluation System Figure 1. MAX1662 EV Kit Schematic 5 Evaluates: MAX1661/MAX1662/MAX1663 MAX1662 Evaluation Kit/Evaluation System 1.0" Figure 2. MAX1662 EV Kit Component Placement Guide 6 1.0" Figure 3. MAX1662 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ MAX1662 Evaluation Kit/Evaluation System Evaluates: MAX1661/MAX1662/MAX1663 1.0" Figure 4. MAX1662 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 7 Evaluates: MAX1661/MAX1662/MAX1663 MAX1662 Evaluation Kit/Evaluation System 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 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. 19-1306; Rev 0; 3/98 Two-Wire Interface Board ____________________________Features ♦ SMBus-Compatible Two-Wire Interface Maxim SMBus Interface Board ____________________________Component List DESIGNATION QTY DESCRIPTION ♦ SMBus Suspend Output ♦ Two SMBus Alert Inputs ♦ Overvoltage Fault Protection ♦ PC Parallel Port Interface _______________Ordering Information PART BOARD TYPE MAXSMBus Companion Board for SMBus EV Kits ___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. C1, C2, C3 3 0.1µF ceramic capacitors C4–C9 6 3.3µF, 25V tantalum capacitors D1 1 1N5235B zener diode, 6.8V D2 1 1N5229B zener diode, 4.3V D3 1 1N4148 small signal diode J1 1 DB25 right angle plug J2 1 Not installed P1 1 2 x 10 right angle male header R1, R2, R3, R10, R11 5 47kΩ, 5% resistors R4–R7 4 4.7kΩ, 5% resistors R8, R9 2 1kΩ, 5% resistors U1 1 74HC05 hex open-collector inverter _______________Detailed Description U2 1 74HC04 hex inverter U3 1 74HC08 quad AND gate U4 1 74HC74 dual D flip-flop U5 1 +5V, 100mA regulator, LM78L05ACM U6 1 MAX865EUA (8 µMAX) U7 1 MAX367CWN (18 SO) NONE 1 PC board 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. 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. 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. Evaluates: MAXSMBus ________________General Description MAXSMBus is an interface between an IBM-compatible PC and System Management Bus (SMBus)™compatible 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. Evaluates: MAXSMBus Two-Wire Interface Board Power Supply Bus Driving Circuitry 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. 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 100Ω. 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 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. Clock or Data Stuck Low Board is connected to correct port, but SMBus is not functioning 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. SMBus is OK, but no response at expected SMBus address 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. Conflict with local printer driver Disable print manager in Windows printer control panel. Disable printer driver. Operating system conflict 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. Address Not Acknowledged Erratic Operation 2 SOLUTION _______________________________________________________________________________________ Two-Wire Interface Board Evaluates: MAXSMBus Table 1. DB25 Connector Signals PIN NAME 1 3 SPARE OUTPUT A SMBCLK_ OUT SMBDATA_ OUT 4 SMBUS_OUT 5 8 LOOPBACK MASK_ ALERT1 MASK_ ALERT2 MASK_ START 9 CAPTURE_ENABLE 10 INT 2 6 7 FUNCTION 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 12 SMBDATA_ IN SMBCLK_ IN 13 LOOPBACK 14 15 SPARE OUTPUT B HOLDING_ CLOCK 16 UNUSED Not used 17 UNUSED Not used 18–25 GND 11 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 Signal ground return _______________________________________________________________________________________ 3 Evaluates: MAXSMBus Two-Wire Interface Board Table 2. Right-Angle Header P1 Signals PIN NAME FUNCTION 1 DUT +5V 2 GND 3 DUT SDA 4 GND Signal ground return 5 GND Signal ground return 6 GND Signal ground return 7 DUT SCL 8 GND 9 DUTSMBSUS 10 GND 11 DUTSMBALERT 12 GND 13 DUTALERT2 14 GND 15 SPARE OUTPUT A 16 GND 17 SPARE OUTPUT B 18 GND Signal ground return 19 GND Signal ground return 20 RAW POWER +5V at 20mA power supply to Maxim companion board Signal ground return SMBDATA interface signal 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 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 _______________________________________________________________________________________ _______________________________________________________________________________________ J1–11 J1–3 J1–12 J1–2 J1–9 GND R7 4.7k SMBDATA_IN R6 4.7k SMBDATA_OUT SMBCLK_IN R5 4.7k SMBCLK_OUT R4 4.7k CAPTURE_ENABLE SMBSUS_DUT J1–4 CAPTURE_ENABLE SMBCLK SMBDATA_IN 8 3 6 1 3 U2B R D 1 74HC04 U2D 74HC05 OC U1B 74HC04 U2C 74HC05 OC U1A Q Q 9 4 5 2 4 ALERT2 +5V 2 SMBSUS 5 START DETECTED 6 11 10 SMBDATA SMBDATA SMBCLK DRIVE_SCL_LOW 13 CAPTURE_ENABLE 12 SMBCLK_IN 74HC04 U2A 74HC74 CLK S 74HC04 1 2 3 4 U4A +5V Q Q R1 47k R2 47k +5V 74HC74 R D CLK S U4B SMBSUS R11 47k R10 47k 9 8 13 11 +5V 12 11 13 SMBDATA SMBCLK 13 74HC08 U3D U3A 4 74HC05 OC U1F 12 10 74HC08 U3C 5 74HC08 U3B 2 74HC08 1 HOLDING_ CLOCK J1–15 J1–8 MASK_START 12 ALERT2 ALERT1 START_DETECTED 9 J1–7 MASK_ALERT2 74HC04 U2F J1–6 MASK_ALERT1 74HC04 CAPTURE_ENABLE GRAB_SCL ALERT2 ALERT1 10 9 5 J1–5 74HC05 OC U1E 74HC05 OC U1D 74HC05 OC U1C SMBCLK 8 11 6 3 10 +5V R3 47k INT J1–10 J1–23 J1–24 J1–25 J1–22 J1–21 J1–20 J1–19 J1–18 LOOPBACK C1 0.1µF +5V C2 0.1µF DECOUPLING CAP. GND J1–13 C3 0.1µF SMBCLK_IN J2–12 J2–11 MASK_START CAPTURE_ENABLE INT SMBDATA_IN J2–7 J2–8 J2–9 J2–10 MASK_ALERT1 MASK_ALERT2 J2–5 J2–6 INTERFACE TEST POINTS HOLDING_CLOCK J2–1 SMBCLK_OUT J2–2 SMBDATA_OUT J2–3 SMBSUS_OUT J2–4 8 6 Evaluates: MAXSMBus ALERT1 U2E Two-Wire Interface Board Figure 1. MAXSMBus Schematic 5 6 +5V Figure 1. MAXSMBus Schematic (continued) _______________________________________________________________________________________ GND1 +5V POS9 -10V J1–1 J1–14 ALERT2 ALERT1 SMBSUS SMBCLK SMBDATA +10V U7 14 13 12 11 10 4 5 6 7 8 8 +9V IN GND 7 GND 6 5 N.C. U5 LM78L05ACM D3 15 3 D2 4.3V 16 2 9 17 MAX367 18 GND 1 D1 6.8V OUT 2 GND 3 GND 4 N.C. 1 R9 1k R8 1k C8 3.3µF 25V +9V +5V C9 3.3µF 25V C5 3.3µF 25V U6 +9V 8 C1V+ 7 IN 6 5 GND C6 3.3µF 25V P1–19 P1–17 P1–15 P1–13 P1–11 P1–9 P1–7 P1–5 P1–3 P1–1 C7 3.3µF 25V -10V GND C4 3.3µF 25V P1–20 P1–18 P1–16 P1–14 P1–12 P1–10 P1–8 P1–6 P1–4 P1–2 P1 2 x 10 RIGHT ANGLE HEADER MAX865 C1+ 2 C2+ 3 C24 V- 1 SPARE OUTPUT J1–14 SPARE OUTPUT J1–1 DUT ALERT2 DUT SMBALERT DUT SMBSUS DUT SCL DUT SDA DUT +5V GND GND0 ALERT2 ALERT1 SBSUS1 SBCLK1 SBDAT1 POS5 +5V +10V Evaluates: MAXSMBus Two-Wire Interface Board 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 Evaluates: MAXSMBus Two-Wire Interface Board 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 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.