View MAX781EVKIT_990602.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-0360; Rev 0; 12/94
MAX781 Evaluation Kit
_______________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.
____________________________Features
o 3.3V, 1A Step-Down Controller o Dual PCMCIA-Compatible VPP Outputs (0V/3.3V/5V/12V) o Digitally Adjustable Switching-Current Source for Battery Charging o 5 Gate-Driver Outputs for High-Side Switching o EV Board Controlled through the Parallel Port of a Personal Computer
Evaluates: MAX781
____________________Component List
DESIGNATION QTY C1, C7, C13 C2 C3, C8, C9, C12 C4 C5 C6 3 1 DESCRIPTION 0.1F capacitors 0.33F, 16V capacitor Murata-Erie GRM42-6X7R334K016, or AVX 1206YC334MAT2A 1F, 25V capacitors Sprague 595D155X0025A2T Open 0.01F capacitor 100F, 10V, low-ESR tantalum capacitor Sprague 593D107X0010D10D2W, or AVX TPS D107K010R0100 22F, 25V low-ESR capacitors Sprague 593D226X0025D2W, or AVX TPS D226K025R0200 3.3F, 25V capacitor Sprague 595D335X0025B2T 50V, 250mA switching diodes Central Semiconductor CMPD4150 30V, 1A Schottky diodes Motorola MBRS130T3, or Nihon EC10QS03 Red LED diode 100V, 1A fast-recovery diode Motorola MBRS1100T3, or Nihon EC11FS2 33H, 2A inductor Coilcraft D03316-33, or Sumida CDR125-330 2-pin power connectors 25-pin DB connector (male right-angle) 3-pin headers
o Software Provided on a 5 1/4" Floppy Disk o Surface-Mount Construction
______________Ordering Information
PART MAX781EVKIT-SO TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
4 0 1 1
______________________________EV Kit
C10, C14, C15 C11 D1, D7
3
1 2
D2, D3, D5 D4 D6
3 1 1
L1 J1, J3 J2 JU1, JU2
1 2 1 2
Component List continued on next page.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
MAX781 Evaluation Kit Evaluates: MAX781
_______Component List (continued)
DESIGNATION QTY Q1 R1, R2 R3 R4 R5 R6 R7 1 2 1 1 1 1 1 DESCRIPTION SMT 2N3904 NPN transistor Central Semiconductor CMPT3904 100k, 5% resistors 10k, 5% resistor 0.2, 10% resistor IRC LC 2010-R200K, or Dale WSL 2010-R200K 300, 5% resistor 6-pin, 100k SIP resistor 0.082, 1% resistor IRC LC 2010-R082F, or Dale WSL 2010-R082F Flyback transformer Dale LPE-6562-A070, or LPE-5047-A154 Maxim MAX781CBX Dual 50V, 3A, N-channel MOSFET Motorola MMDF1N05E, or IR IRF7102 Dual 20V, 2A, P-channel MOSFET Motorola MMDF2P02E, or IR IRF7104 5 1/4" floppy disk 3.50" x 4.00" printed circuit board
______________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 (516) 435-1110 (708) 639-6400 (605) 668-4131 (402) 564-3131 (310) 322-3331 (512) 992-7900 (602) 244-3576 (814) 237-1431 (805) 867-2555 81-3-3494-7411 (408) 988-8000 (603) 224-1961 (708) 956-0666 81-3-3607-5111 FAX (207) 283-1941 (516) 435-1824 (708) 639-1469 (605) 665-1627 (402) 563-1841 (301) 322-3332 (512) 992-3377 (602) 244-4015 (814) 238-0490 (805) 867-2556 81-3-3494-7414 (408) 970-3950 (603) 224-1430 (708) 956-0702 81-3-3607-5144
T1 U1 U2
1 1 1
U3 None None
1 1 1
_________________________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
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
_______________Detailed Description
Battery Charging
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 0.2 resistor R4.
CABLE PIN 2 3 4 13 MAX781 FUNCTION Chip Enable (CE) Serial Clock (SCLK) Data Input (DIN) Data Output (DOUT)
MAX781 EV Kit
Table 1. 25-Pin Connector Pinout
PARALLEL PORT FUNCTION Output Bit 0 Output Bit 1 Output Bit 2 Input (SEL)
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
B23
B22
B2
B1
B0
DOUT (FROM MAX781)
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0
X
X
Figure 1. MAX781 EV Kit Timing Diagram
_______________________________________________________________________________________ 3
MAX781 Evaluation Kit Evaluates: MAX781
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.
Table 2. Keyboard Commands
KEY <-, -> Home End Enter 0, Delete 1, Insert Esc FUNCTION The directional arrows move the cursor to select the bits of the 32-bit data stream. Moves the cursor to Bit 0. Moves the cursor to Bit 31. Sends the new 32-bit stream to the MAX781. Clears the selected bit. Sets the selected bit. Exits the program.
4
_______________________________________________________________________________________
FAST AUXIN J4-1 DCIN R3 10k 3OUT BVPP AVPP 5OUT D7 CMPD4150 C9 1F 25V C8 1F 25V VHI BATT+ U2A MMDF1N05E C15 22F 25V C11 3.3F 25V C12 1F 25V D1 CMPD4150 C14 22F 25V R1 100k 15 34 AOUT AUXIN TEMP 32 33 FAST L1 33H 2A U3A,B MMDF2P02E C1 0.1F D3 MBRS130T3 AOUT TEMP R2 10k
J3-1
UVLO
AGND
PGND
SS
23
J2-21 D4 BATT+ 1 INT 2 3 4 5 6 2 Q1 2N3904 R5 300 3 JU1
C5 0.01F J4-2 GND
J2-22
C3 1F 25V
J2-23
J2-24 R6B R6C R6D R6E
Evaluates: MAX781
_______________________________________________________________________________________
DALE LPE 6562-A070 D6 MBRS1100T3 10 6 T1 3OUT 1, 2 U2B MMDF1N05E D5 MBRS130T3 4, 5 D2 MBRS130T3 C10 22F 25V C2 0.33F 10 CE 11 SCLK 12 DOUT 13 DIN 3OUT 25 C13 0.1F GD1 GD2 GD3 GD4 3 4 GD4 GD5 27 GD5 3OUT SHDN 35 GD1 36 GD2 1 GD3 2 R7 0.082 14 INT 31 VREF 9 SYNC DLOW 21 CS3 26 BOOT 22 C7 0.1F R4 0.2 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 CE C6 100F 10V SHDN 20 JU2 1 AGND AND GND TIE TOGETHER AT THIS POINT BATT+ 30 12 3 8 DIN
Figure 2. MAX781 EV Kit Schematic Diagram
BATT+
J3-2 BATT-
J2-2
J2-3
J2-13
J2-4
VREF
SYNC
J2-18
SCLK
J2-19
DOUT
J2-20
J2-25
MAX781 Evaluation Kit
5
MAX781 Evaluation Kit Evaluates: MAX781
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
(c) 1994 Maxim Integrated Products
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
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.
Evaluates: MAX781
? ?@@@@@@@@ehY0@@@@@@@@ehY0@@@@@@@@@@&?@@@@@@@@e@@@@@@@@@@@4V?hY0@@@@@@@@@@e@@@@@@@@@@@@&?fY0@@@@@@@@@@&?@@@@@@@@ehY0@@@@@@@@ehY0@@@@@@@@@@@? ?@@@@@@@@h?Y(@@@@@@@@@h?Y(@@@@@@@@@@&W?@@@@@@@@e1@@@@@@@@@@@'Vg?Y(@@@@@@@@@@7e@@@@@@@@@@@&W?e?Y(@@@@@@@@@@&W?@@@@@@@@h?Y(@@@@@@@@@h?Y(@@@@@@@@@@@7? ?@@@@@@@@hY(@@@@@@@@@@hY(@@@@@@@@@@&We@@@@@@@@eX)@@@@@@@@@@@'V?fY(@@@@@@@@@@&We@@@@@@@@@@@JfY(@@@@@@@@@@&We@@@@@@@@hY(@@@@@@@@@@hY(@@@@@@@@@@@&W? ?@@@@@@@@g?Y(@@@@@@@@@@@g?Y(@@@@@@@@@@&W?e@@@@@@@@e?X6@@@@@@@@@@@'Ve?M(@@@@@@@@@@&W?e@@@@@@@@@@7?e?Y(@@@@@@@@@@&W?e@@@@@@@@g?Y(@@@@@@@@@@@g?Y(@@@@@@@@@@@&W ?@@@@@@@@gY(@@@@@@@@@@@@gY(@@@@@@@@@@&Wf@@@@@@@@f?K)@@@@@@@@@@'IM0@@@@@@@@@@@&Wf@@@@@@@@@&W?eY(@@@@@@@@@@&Wf@@@@@@@@gY(@@@@@@@@@@@@gY(@@@@@@@@@@@&W? ?@@@@@@@@f?Y(@@@@@@@@@@@@@f?Y(@@@@@@@@@@&W?f@@@@@@@@gX)@@@@@@@@@@@@@@@@@@@@@@@2W?f@@@@@@@@&We?Y(@@@@@@@@@@&W?f@@@@@@@@fY(@@@@@@@@@@@@@@fY(@@@@@@@@@@@&W? ?@@@@@@@@fY(@@@@@@@@@@@@@@fY(@@@@@@@@@@&Wg@@@@@@@@g?X)@@@@@@@@@@@@@@@@@@@@&O?g@@@@@@@&W?eY(@@@@@@@@@@&Wg@@@@@@@@f?Y(@@@@@@@@@@@@@f?Y(@@@@@@@@@@@&W ?@@@@@@@@e?Y(@@@@@@@@@@@@@@@e?Y(@@@@@@@@@@&W?g@@@@@@@@hX)@@@@@@@@@@@@@@@@@@&Wh@@@@@@@Je?Y(@@@@@@@@@@&W?g@@@@@@@@e?Y(@@@@@@@@@@@@@@@e?Y(@@@@@@@@@@@&W ?@@@@@@@@eY(@@@@@@@@@@@@@@@@eY(@@@@@@@@@@&Wh@@@@@@@@h?X)@@@@@@@@@@@@@@@@&W?h@@@@@@@?eY(@@@@@@@@@@&Wh@@@@@@@@eY(@@@@@@@@@@@@@@@@e(@@@@@@@@@@@&W ?@@@@@@@@?Y(@@@@@@@@@@@@@@@@@?Y(@@@@@@@@@@&W?h@@@@@@@@ehX)@@@@@@@@@@@@@@&Weh@@@@@@@??Y(@@@@@@@@@@&W?h@@@@@@@@?Y(@@@@@@@@@@@@@@@@@?YY(@@@@@@@@@@@&W? ?@@@@@@@@Y(@@@@@@@@@@@@@@@@@@Y(@@@@@@@@@@&Weh@@@@@@@@eh?X)@@@@@@@@@@@@&W?eh@@@@@@@?M(@@@@@@@@@@&Weh@@@@@@@@Y(@@@@@@@@@@@@@@@@@@Y(@@@@@@@@@@@&W? ?@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&W?eh@@@@@@@@fhL@@@@@@@@@@@@?fh@@@@@@@@@@@@@@@@@@@&W?eh@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&W ?@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@&Wfh@@@@@@@@fhH@@@@@@@@@@@@3fh@@@@@@@@@@@@@@@@@@&Wfh@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@& ?@@@@@@@@@@@@@@@@@@&W@@@@@@@@@@@@@@@@@&W?fh@@@@@@@@eh?Y(@@@@@@@@@@@@@N?eh@@@@@@@@@@@@@@@@@2W?fh@@@@@@@@@@@@@@@@@@&W@@@@@@@@@@@@@@@@@@&WW? ?@@@@@@@@@@@@@@@@@&W?@@@@@@@@@@@@@@@@&W @@@@@@@@ehY(@@@@@@@@@@@@@@'Veh@@@@@@@@@@@@@@@&O? @@@@@@@@@@@@@@@@@&W?@@@@@@@@@@@@@@@@@&W? ?@@@@@@@@@@@@@@@@&We@@@@@@@@@@@@@@@& @@@@@@@@h?Y(@@@@@@@@@@@@@@@@'V?h@@@@@@@@@@@@@@&W @@@@@@@@@@@@@@@@&We@@@@@@@@@@@@@@@@&W ?@@@@@@@@@@@@@@@&W?e@@@@@@@@@@@@@@@JW? @@@@@@@@hY(@@@@@@@@@@@@@@@@@@'Vh@@@@@@@@@@@@@&W? @@@@@@@@@@@@@@@&W?e@@@@@@@@@@@@@@@&W? ?@@@@@@@@@@@@@@&Wf@@@@@@@@@@@@@@7? @@@@@@@@g?Y(@@@@@@@@@@@@@@@@@@@@'V?g@@@@@@@@@@@@&W @@@@@@@@@@@@@@&Wf@@@@@@@@@@@@@@&W ?@@@@@@@@@@@@@&W?f@@@@@@@@@@@@@&W? @@@@@@@@gY(@@@@@@@@@&OK)@@@@@@@@@'Vg@@@@@@@@@@@&W? @@@@@@@@@@@@@&W?f@@@@@@@@@@@@&WW? ?@@@@@@@@@@@@&Wg@@@@@@@@@@@@&W @@@@@@@@f?Y(@@@@@@@@@&WeX)@@@@@@@@@'V?f@@@@@@@@@@&W @@@@@@@@@@@@&Wg@@@@@@@@@@@@@& ?@@@@@@@@@@@&W?g@@@@@@@@@@@&W? @@@@@@@@fY(@@@@@@@@@&W?e?X)@@@@@@@@@'Vf@@@@@@@@@&W? @@@@@@@@@@@&W?g@@@@@@@@@@@&W? ?@@@@@@@@@@&Wh@@@@@@@@@@&W @@@@@@@@f5@@@@@@@@@&WgX)@@@@@@@@@3f@@@@@@@@&W @@@@@@@@@@&Wh@@@@@@@@@@&W ?@@@@@@@@@2W?h@@@@@@@@@2W? @@@@@@@@f@@@@@@@@@2W?g?X6@@@@@@@@@f@@@@@@@2W? @@@@@@@@@2W?h@@@@@@@@@2W? ?
MAX781 Evaluation Kit
MAX781 EV DS REV 0
My end product is: __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __|
City _______________________State_____________Zip__________________Phone# _____________________________
Address ______________________________________________________________________________________________
Company _____________________________________________________________________________________________
Name ______________________________________________Title ______________________________________________
My application is: __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __| __|
FAX NUMBERS:
Featuring:
Product Data Sheets Evaluation Kit Manuals Free Literature Request Cards
Call toll free 1-800-998-8800 for free samples or literature.
Germany (Maxim GmbH)
UK (01734) 305577
US (408) 737-7194
1994 EVALUATION KIT DATA BOOK
1994 New Releases Data Book 1994 Battery Management and DC-DC Converter Circuit Collection 1994 Applications & Product Highlights Book 1993 New Releases Data Book, Vol. II 1993 Applications & Product Highlights Book 1992 New Releases Data Book, Vol. I 1992 Applications & Product Highlights Book
Other Data Books Available from Maxim:
1994 EVALUATION KIT DATA BOOK FAXBACK OFFER
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.
Printed USA
(089) 8544239
France (1) 30 64 73 48
Italy
(02) 99041981
is a registered trademark of Maxim Integrated Products.
Taiwan (35) 777659 Japan (03) 3232-6149

▲Up To Search▲

Price & Availability of MAX781EVKIT

	To Download MAX781EVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .