19-0360; Rev 0; 12/94 MAX781 Evaluation Kit ____________________________Features ♦ 3.3V, 1A Step-Down Controller ♦ Dual PCMCIA-Compatible VPP Outputs (0V/3.3V/5V/12V) ♦ Digitally Adjustable Switching-Current Source for Battery Charging ♦ 5 Gate-Driver Outputs for High-Side Switching ♦ EV Board Controlled through the Parallel Port of a Personal Computer ____________________Component List DESIGNATION QTY C1, C7, C13 DESCRIPTION 3 0.1µF capacitors C2 1 0.33µF, 16V capacitor Murata-Erie GRM42-6X7R334K016, or AVX 1206YC334MAT2A C3, C8, C9, C12 4 1µF, 25V capacitors Sprague 595D155X0025A2T C4 0 Open C5 1 0.01µF capacitor C6 1 100µF, 10V, low-ESR tantalum capacitor Sprague 593D107X0010D10D2W, or AVX TPS D107K010R0100 C10, C14, C15 3 22µF, 25V low-ESR capacitors Sprague 593D226X0025D2W, or AVX TPS D226K025R0200 C11 1 3.3µF, 25V capacitor Sprague 595D335X0025B2T D1, D7 2 50V, 250mA switching diodes Central Semiconductor CMPD4150 D2, D3, D5 3 30V, 1A Schottky diodes Motorola MBRS130T3, or Nihon EC10QS03 D4 1 Red LED diode D6 1 100V, 1A fast-recovery diode Motorola MBRS1100T3, or Nihon EC11FS2 L1 1 33µH, 2A inductor Coilcraft D03316-33, or Sumida CDR125-330 J1, J3 2 2-pin power connectors J2 1 25-pin DB connector (male right-angle) JU1, JU2 2 3-pin headers ♦ Software Provided on a 5 1/4" Floppy Disk ♦ Surface-Mount Construction ______________Ordering Information PART MAX781EVKIT-SO TEMP. RANGE 0°C to +70°C BOARD TYPE Surface Mount ______________________________EV Kit Component List continued on next page. ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 Evaluates: MAX781 _______________General Description The MAX781 evaluation kit (EV kit) demonstrates the various outputs of the battery-powered MAX781 computer controller. The evaluation board provides a 3.3V output, two programmable PCMCIA outputs, five gate drivers, and a digitally adjustable battery charger. The board connects to the parallel port of an IBM-compatible computer and is controlled by software included in the EV kit. Evaluates: MAX781 MAX781 Evaluation Kit _______Component List (continued) DESIGNATION QTY DESCRIPTION Q1 1 SMT 2N3904 NPN transistor Central Semiconductor CMPT3904 R1, R2 2 100kΩ, 5% resistors R3 1 10kΩ, 5% resistor R4 1 0.2Ω, 10% resistor IRC LC 2010-R200K, or Dale WSL 2010-R200K R5 1 300Ω, 5% resistor R6 1 6-pin, 100kΩ SIP resistor R7 1 0.082Ω, 1% resistor IRC LC 2010-R082F, or Dale WSL 2010-R082F T1 1 Flyback transformer Dale LPE-6562-A070, or LPE-5047-A154 U1 1 Maxim MAX781CBX U2 1 Dual 50V, 3A, N-channel MOSFET Motorola MMDF1N05E, or IR IRF7102 U3 1 Dual 20V, 2A, P-channel MOSFET Motorola MMDF2P02E, or IR IRF7104 None 1 5 1/4" floppy disk None 1 3.50" x 4.00" printed circuit board _________________________Quick Start The EV kit software is provided on a 5 1/4" floppy disk. Copy the disk to another floppy or hard drive and store the master in a safe place. 1) Connect a 25-pin straight-through cable between the parallel-port connector of an IBM-compatible personal computer and the MAX781 evaluation board. 2) Set the jumpers on JU1 and JU2 across pins 2 & 3 to enable the MAX781 at 200kHz. 3) Connect a 5 to 8 cell NiCd or NiMH battery to the battery connector (J3) on the evaluation board. Observe the polarity marked on the board when making these connections. 4) [OPTIONAL]: Connect a 10V to 18V power supply to the DCIN connector (J1) on the evaluation board. The DCIN voltage should be greater than two-times the number of cells in the battery. For example, DCIN should be greater than 12V for a 6-cell battery. 2 ______________Component Suppliers SUPPLIER AVX Central Semiconductor CoilCraft Dale (Inductors) Dale (Resistors) International Rectifier IRC Motorola (Power Devices) Murata-Erie Nihon (USA) (Japan) Siliconix Sprague Sumida (USA) (Japan) PHONE (207) 282-5111 FAX (207) 283-1941 (516) 435-1110 (516) 435-1824 (708) 639-6400 (605) 668-4131 (402) 564-3131 (708) 639-1469 (605) 665-1627 (402) 563-1841 (310) 322-3331 (301) 322-3332 (512) 992-7900 (512) 992-3377 (602) 244-3576 (602) 244-4015 (814) 237-1431 (805) 867-2555 81-3-3494-7411 (408) 988-8000 (603) 224-1961 (708) 956-0666 81-3-3607-5111 (814) 238-0490 (805) 867-2556 81-3-3494-7414 (408) 970-3950 (603) 224-1430 (708) 956-0702 81-3-3607-5144 This supply is only required for the battery-charging feature. 5) Start the EV kit software by setting the current directory to match the directory containing the MAX781 software, and enter “MAX781EV” on the computer’s keyboard. The program displays the board status in the top section of the screen and allows the user to set the 32-bit data stream written to the MAX781. NOTE: Many of the MAX781’s functions are disabled until its 5V regulator is enabled and the MAX781 is programmed for operate mode. The MAX781 is reset to its power-up condition (5V regulator off, low-power mode) every time the program is restarted. 6) To turn on the MAX781’s 5V regulator, use the direction arrows on the computer’s keyboard to position the cursor to Bit 9 (5ON). Change Bit 9 to 1 using the “1” or “Insert” key. The function of the selected bit is indicated on the bottom status line. 7) Use the direction arrows on the computer’s keyboard to position the cursor to Bit 4 (MODE0). Change Bit 4 to 0 using the “0” or “Delete” key. 8) Press the “ENTER” key to send the 32-bit data field to the MAX781. The board is now in operate mode and all functions are enabled. NOTE: The battery-charging feature requires the user to monitor the charge cycle and terminate battery charging as soon as full charge is achieved. Only use batteries rated for a 1A or greater charging current. _______________________________________________________________________________________ MAX781 Evaluation Kit Table 1. 25-Pin Connector Pinout Battery Charging MAX781 FUNCTION PARALLEL PORT FUNCTION 2 Chip Enable (CE) Output Bit 0 3 Serial Clock (SCLK) Output Bit 1 4 Data Input (DIN) Output Bit 2 13 Data Output (DOUT) Input (SEL) CABLE PIN The MAX781 is designed for battery-operated applications. The evaluation board should be connected to a NiCd or NiMH battery with 5 to 8 cells. The user must monitor the charge cycle and terminate it before overcharging occurs. An external DC supply (DCIN) is required for charging the battery. Typically, the input voltage needs to provide 2V for each cell in the battery. This allows for the battery’s charging voltage, and also allows a small margin for the charging circuit. To use the battery charger, connect the DCIN input to J1 and set the desired charging current using bits 10–16 (CHG0–CHG6). The charger DAC level and resulting output current are displayed on the right-hand edge of the screen. After the level has been set, set bit 7 (CHARGE) to enable the charger. To verify the actual battery current, measure the voltage across the 0.2Ω resistor R4. tery (+) and forces the MAX781 into shutdown mode. Moving the shunt to pins 2 & 3 grounds the SHDN pin and enables the MAX781. Remove the shunt if an external source is connected to the SHDN pad. Digital Interface The MAX781 EV kit connects to the parallel port of an IBM-compatible computer. Table 1 gives the connector pinout, and Figure 1 is the timing diagram for the serial interface. The signals are generated by manipulating the individual bits of the computer’s parallel port. This is an economical but somewhat slow method of communicating with the evaluation board. A 25-pin straight-through cable (user provided) connects between the parallel-port connector on the back of an IBM-compatible computer and the board. No other device should be connected to the port when the MAX781EV program is running. Jumper Selection The SYNC and SHDN pins are controlled by positioning shunts on jumpers JU1 and JU2 respectively. Placing a shunt across pins 1 & 2 of JU1 connects the SYNC pin to VREF and sets 300kHz operation. Placing the shunt across pins 2 & 3 grounds the SYNC pin and sets 200kHz operation. Remove the shunt if an external source is connected to the SYNC pad. The shutdown (SHDN) pin is controlled by JU2. Placing a shunt across pins 1 & 2 connects SHDN to the bat- CE SCLK DIN (TO MAX781) B31 B30 B29 B28 B27 B26 B25 B24 DOUT (FROM MAX781) RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0 B23 B22 X B2 B1 B0 X Figure 1. MAX781 EV Kit Timing Diagram _______________________________________________________________________________________ 3 MAX781 EV Kit _______________Detailed Description Evaluates: MAX781 MAX781 Evaluation Kit MAX781 EV Kit Software Two programs are supplied on the 5 1/4" floppy disk included with the MAX781 EV kit. The MAX781EV.EXE program has the most features and displays. Most users will use this program to evaluate the MAX781. The second program, MAX781.BAS, is a core program for those users who wish to write their own program in QBASIC. The MAX781EV program allows the user to control the various MAX781 functions and displays the programmed configuration. A 32-bit binary string is displayed in the bottom section of the screen. This is the 32-bit data stream that is sent to the MAX781 whenever the “Enter” key is pressed. The line just above the output stream displays the previous 32-bit data stream sent to the MAX781 and the 8 bits read from the MAX781 during that sequence. The user positions the cursor to the desired bit using the directional arrows on the computer’s keyboard. The selected bit number and bit function are indicated on the bottom display line. Bits are modified using the keys listed in Table 2. The table is displayed by the program whenever a question mark (?) is entered. The top portion of the display indicates the programmed configuration of the MAX781. The display is updated every time the “Enter” key is pressed to send a new command. 4 Table 2. Keyboard Commands KEY FUNCTION <–, –> The directional arrows move the cursor to select the bits of the 32-bit data stream. Home Moves the cursor to Bit 0. End Moves the cursor to Bit 31. Enter Sends the new 32-bit stream to the MAX781. 0, Delete Clears the selected bit. 1, Insert Sets the selected bit. Esc Exits the program. _______________________________________________________________________________________ DIN J2-20 J2-25 J2-24 J2-23 J2-22 INT DOUT J2-19 J2-21 SCLK J2-18 CE SYNC VREF J2-4 J2-13 J2-3 J2-2 D2 MBRS130T3 D3 MBRS130T3 J3-2 BATT- BATT+ J3-1 L1 33µH 2A 2 C10 22µF 25V U3A,B MMDF2P02E 100k R1 3 R6B BATT+ D4 C2 0.33µF C1 0.1µF R5 300Ω 34 32 33 JU1 1 2 3 9 SYNC 31 VREF 14 INT 12 DOUT 13 DIN 11 SCLK 10 CE 30 8 22 20 GD5 GD4 GND GD5 GD3 GD4 GD2 C9 1µF 25V 25V C6 100µF 10V C13 0.1µF C7 0.1µF VHI C11 3.3µF 25V 5OUT 3OUT BVPP AVPP AOUT TEMP AUXIN D5 MBRS130T3 1, 2 3OUT 4, 5 DALE LPE 6562-A070 D6 MBRS1100T3 10 6 T1 JU2 BATT+ AGND AND GND TIE TOGETHER AT THIS POINT 3OUT R7 0.082Ω U2B MMDF1N05E C15 22µF 25V C12 1µF 25V R3 10k R2 10k SHDN U2A MMDF1N05E BATT+ C8 1µF GD1 D7 CMPD4150 J4-2 C5 0.01µF 27 3 4 GD2 1 GD3 2 SHDN 35 GD1 36 3OUT 25 DLOW 21 CS3 26 BOOT 29 VCHG MAX781 5OUT 18 19 DCHG U1 AVPP 5 28 BATT 7 BVPP 16 COMP 6 VHI 17 CSBAT 23 C4 DHI OPEN 24 LX Q1 2N3904 C3 1µF 25V R4 0.2Ω 15 FAST UVLO C14 22µF 25V 4 R6C AUXIN AGND D1 CMPD4150 5 R6D TEMP DCIN 1 AOUT PGND J4-1 6 R6E 3 2 2 3 1 Evaluates: MAX781 SS FAST MAX781 Evaluation Kit Figure 2. MAX781 EV Kit Schematic Diagram _______________________________________________________________________________________ 5 Evaluates: MAX781 MAX781 Evaluation Kit Figure 3. MAX781 EV Kit Component Placement Guide—Component Side Figure 4. MAX781 EV Kit Component Placement Guide—Solder Side 6 _______________________________________________________________________________________ MAX781 Evaluation Kit Evaluates: MAX781 Figure 5. MAX781 EV Kit PC Board Layout—Component Side Figure 6. MAX781 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 7 Evaluates: MAX781 MAX781 Evaluation Kit 1994 EVALUATION KIT DATA BOOK FAXBACK OFFER ? ?W2@@@@@@@@@h?W2@@@@@@@@@ ?W2@@@@@@@f@@@@@@@@@6X?g?W2@@@@@@@@@f@@@@@@@@ ?W2@@@@@@@@@h?W2@@@@@@@@@? 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Accelerate your time to market with Maxim’s evaluation kits (EV kits) that simplify design-in and prototyping. For your convenience, the 1994 Evaluation Kit Data Book includes EV kit manuals and corresponding data sheets covering 95 products in one easy-to-use book. To receive your free data book, simply FAX this response card to your nearest Maxim office, or call toll-free 1-800-998-8800 (in the US only) for prompt fulfillment. We look forward to serving you. FAX NUMBERS: US (408) 737-7194 Italy (02) 99041981 UK (01734) 305577 France (1) 30 64 73 48 Germany (Maxim GmbH) (089) 8544239 Japan (03) 3232-6149 Taiwan (35) 777659 My application is: __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| My end product is: __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| Name ______________________________________________Title ______________________________________________ Company _____________________________________________________________________________________________ Address ______________________________________________________________________________________________ City _______________________State_____________Zip__________________Phone# _____________________________ MAX781 EV DS REV 0 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 © 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.