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19-2708; Rev 0; 12/02
MAX6955 Evaluation Kit
General Description
The MAX6955 evaluation kit (EV kit) is designed to evaluate the MAX6955 light-emitting diode (LED) display driver with a 2-wire interface. The EV kit board contains two MAX6955 LED display drivers on symmetrical sides of the board, allowing a 16-digit display using sixteen 14segment alphanumeric LEDs. The DB-25 connector allows a PC's parallel (printer) port to provide the 2-wire interface. The Windows(R) software provides a friendly graphical user interface (GUI) to exercise the features of the MAX6955 by allowing on-the-fly text and numeric entry and access to all relevant registers. The software includes multiple tabs for accessing the various registers and maintains a consistent format with controls on the left side of the software's main window pertaining to U1, located on the left side of the EV kit board. Similarly, all the controls on the right side of the software's main window pertain to U2, located on the right side of the EV kit board. The EV kit board requires a 3.3VDC or 5VDC power supply and jumpers JU1-JU4 allow the user to manually modify the device address of U1 or U2. Order the MAX6955EVKIT for comprehensive evaluation of the MAX6955 using a PC with an available parallel port.
Features
o Proven PC Board Layout o Windows 95/98/ME/NT/2000/XP-Compatible Evaluation Software o 2-Wire Serial Interface o Sixteen 14-Segment Bright LEDs o Fully Assembled and Tested
Evaluates: MAX6955
Ordering Information
PART MAX6955EVKIT TEMP RANGE 0C to +70C IC PACKAGE 36 SSOP
MAX6955 EV Kit Files
PROGRAM INSTALL.EXE MAX6955.EXE HELPFILE.HTM PORT95NT.EXE UNINST.INI DESCRIPTION Installs the EV kit software Application program MAX6955 EV kit Helpfile SST's freeware DLPortIO driver package Uninstalls the EV kit software
Component List
DESIGNATION QTY C1 1 DESCRIPTION 22F 20%, 6.3V X5R ceramic capacitor (1210) TDK C3225X5R0J226M 12pF 5%, 50V COG ceramic capacitor (0603) TDK C1608COG1H120JT 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104KT 1F 20%, 10V X5R ceramic capacitors (0805) TDK C2012X5R1A105M 0.54in dual 14-segment alphanumeric LEDs Lumex LDD-F5406RI Fairchild MDA6140C Zener diodes, Vz = 5.1V (3-pin SOT23), top mark: KZ2 or Z2 Diodes Inc. BZX84C5V1 DESIGNATION QTY J1 J2, J3 JU1-JU4 N1, N2 1 2 4 2 DESCRIPTION Male DB-25 right-angle plug 20-pin dual-row 2 x 10 headers 5-pin headers N-channel MOSFETs (3-pin SOT23), top mark: 702 Central Semiconductor 2N7002 Bipolar junction transistors (3-pin SOT23), top mark: C1A Central Semiconductor CMPT3904 100k 5% resistors (1206) 13k 5% resistors (1206) 47k 5% resistors (1206) 100k 1% resistors (1206) MAX6955AAX (36-pin SSOP) Shunts
C2
1
C3, C5
2
Q1, Q2 R1, R5 R2, R6 R3, R4, R7-R10, R13-R22 R11, R12 U1, U2 None
2 2 2 16 2 2 4
C4, C6
2
D1-D8
8
D9-D12
4
Windows is a registered trademark of Microsoft Corp. 1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX6955 Evaluation Kit Evaluates: MAX6955
Component Suppliers
SUPPLIER Central Semiconductor Diodes Inc. Fairchild Semiconductor Lumex, Inc. Scientific Software Tools, Inc. TDK PHONE WEBSITE
3) Connect a 3.3VDC or 5VDC power supply between the VCC and GND pads on the MAX6955 EV kit board. 4) Start the MAX6955 EV kit program by double clicking its icon located in the Programs section within the Start menu. 5) The program automatically detects the MAX6955 EV kit board and displays 2-wire Hardware Detected in a green font. 6) The MAX6955 EV kit board and MAX6955 EV kit software should automatically display MAX6955 EVKIT.
631-435-1110 www.centralsemi.com 805-446-4800 www.diodes.com 888-522-5372 www.fairchildsemi.com 800-278-5666 www.lumex.com 610-891-1640 www.sstnet.com 847-803-6100 www.component.tdk.com
Software Description
The EV kit software's main window, shown in Figure 1, allows on-the-fly text and numeric entry and also allows access to all the relevant registers for easy configuration. The controls on the left side of the software's main window control U1 and similarly, the controls on the right side of the software's main window control U2. Each register has its own tab in the order of the MAX6955's address map. A 2-wire operation field is present at the very bottom of the software's main window, which shows the results of the last 2-wire operation.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed: * MAX6955EVKIT * A 3.3VDC or 5VDC power supply * PC with Windows 95/98/ME/NT/2000/XP * An available parallel port (female DB-25 connector on back of PC) * A standard 25-pin, straight-through, male-to-female cable to connect the PC's parallel port to the MAX6955 EV kit board
Alphanumeric Entry for U1
In the upper left-hand corner of the software's main window is the Alphanumeric Entry for U1 group box. This group box has five main controls: * Plane group box * U1 Address (write) combo box * U1 Address (read) combo box * Alphanumeric entry field * Decimal Point checkbox and individual decimal point checkboxes The first control is the Plane group box, which allows the user to select which plane to write to. The radio button choices in the Plane group box are P0 and P1, P0, and P1. It is important to note that once one of these plane radio buttons is selected, the software automatically takes the text or numbers that exist in the Alphanumeric Entry field and writes them to the display. The second and third controls are the U1 Address (write) and the U1 Address (read) combo boxes. These device-address combo boxes default to 0xCA for write and 0xCB for read. If you modify the default device address, change the jumper settings on JU1 and JU2 on the MAX6955 EV kit board. If the default address settings are changed on the board, the user must also manually select the correct device address
Procedure
1) Connect a cable from the PC's parallel port to the MAX6955 EV kit board. Use a 25-pin, straightthrough, female-to-male cable. 2) Install the supplied CD into the CD drive of your PC and run INSTALL.EXE. When the installer window shows up on the screen, press the INSTALL button. The MAX6955 program files are copied and icons are created in the Programs section within the Start menu. When you see the self-extracting DLPortIO driver install window appear on the screen, press the Yes button. This automatically unpacks the compressed files and runs the DLPortIO driver installer. If using Windows NT, 2000, or XP, you must have administrator privileges on your PC. If you do not, then contact your system administrator to allow installation. You need to restart your PC after installing the DLPortIO driver.
2
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MAX6955 Evaluation Kit Evaluates: MAX6955
Figure 1. MAX6955 EV Kit Software's Main Window
in the U1 Address (write) and the U1 Address (read) combo boxes. Table 1 lists the device address selection for the various JU1 and JU2 jumper settings. The fourth control is the Alphanumeric Entry field, which displays MAX6955 at the start of the program. The user may type letters, numbers, apostrophes, commas, or even spaces in the Alphanumeric Entry field using the computer's keyboard. The Alphanumeric Entry field also supports standard word processing features like highlighting, insert, and delete. Anytime an invalid character is typed into the Alphanumeric Entry field, such as an @, a character error message box pops up, indicating an invalid character was typed.
Anytime a valid character is typed into the Alphanumeric Entry field, the software automatically writes it to the corresponding digit on the display. The last control type within the Alphanumeric Entry for U1 group box is the Decimal Point checkbox and the individual decimal point checkboxes. When the Decimal Point checkbox is checked, all of the individual decimal point checkboxes become visible. When the Decimal Point checkbox is unchecked, all of the individual decimal point checkboxes are hidden. Checking one of the individual decimal point checkboxes automatically lights up the corresponding decimal point on the board.
3
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MAX6955 Evaluation Kit Evaluates: MAX6955
Alphanumeric Entry for U2
The Alphanumeric Entry for U2 group box is in the upper right-hand corner of the software's main window. This group box has five main controls: * * * * * Plane group box U2 Address (write) combo box U2 Address (read) combo box Alphanumeric Entry Field Decimal Point checkbox and individual decimal point checkboxes The first control is the Plane group box, which allows the user to select which plane to write to. The radio button choices in the Plane group box are P0 and P1, P0, and P1. It is important to note that once one of these plane radio buttons is selected, the software automatically takes the text or numbers that exist in the Alphanumeric Entry field and writes them to the display. The second and third controls are the U2 Address (write) and the U2 Address (read) combo boxes. These device address combo boxes default to 0xC0 for write and 0xC1 for read. If you modify the default device address, change the jumper settings on JU3 and JU4 on the MAX6955 EV kit board. If the default address settings are changed on the board, the user must also manually select the correct device address in the U2 Address (write) and the U2 Address (read) combo boxes. Table 2 lists the device address selection for the various JU3 and JU4 jumper settings. The fourth control is the Alphanumeric Entry field, which displays EVKIT at the start of the program. The user may type letters, numbers, apostrophes, commas, or even spaces in the Alphanumeric Entry field using the computer's keyboard. The Alphanumeric Entry field also supports standard word processing features like highlighting, insert, and delete. Anytime an invalid character is typed into the Alphanumeric Entry field, such as an @, a character error message box pops up, indicating an invalid character was typed. Anytime a valid character is typed into the Alphanumeric Entry field, the software automatically writes it to the corresponding digit on the display. The last control type within the Alphanumeric Entry for U2 group box is the Decimal Point checkbox and the individual decimal point checkboxes. When the Decimal Point checkbox is checked, all of the individual decimal point checkboxes become visible. When the Decimal Point checkbox is unchecked, all of the individual decimal point checkboxes are hidden. Checking one of the individual decimal point checkboxes automatically lights up the corresponding decimal point on the board.
Register Tabs
The MAX6955 EV kit software has 43 register tabs for both U1 and U2, giving access to 86 unique registers. Any register tab can be selected by a mouse click when visible and not all register tabs can be visible at once. Scroll through the register tabs using the left and right scroll arrows located on the right-hand side of the software's main window. The order of the register tabs corresponds to the same order of the MAX6955's address map. Refer to the MAX6955 IC data sheet for details on the address map and a complete description of each register.
Keyboard Navigation
When you type on the keyboard, the system must know which control should receive the keys. Press the tab key to move the keyboard's focus from one control to the next. The focused control is indicated by a dotted outline. Shift + tab moves the focus to the previously focused control. Buttons respond to the keyboard's space bar. Some controls respond to the keyboard's up and down arrow keys. Activate the program's menu bar by pressing the F10 key, then press the letter of the menu item you want. Most menu items have one letter underlined, indicating their shortcut key.
Hardware Description
The MAX6955 EV kit board is designed symmetrically so that the left side of the board pertains to U1 and the right side of the board pertains to U2. Thus, the first eight digits are driven by U1 and the last eight digits are driven by U2. An OSC pad for U1 is provided for external clock operation and an OSC_OUT pad for U2 is also provided for cascading additional MAX6955 devices. The DB-25 connector and associated circuitry are only needed for obtaining the 2-wire interface from the PC's parallel port and are not needed in typical applications. Connect the DB-25 connector, J1, to the PC's parallel port using a 25-pin straight-through, female-to-male cable. Four jumpers are on the EV kit board to modify the device address for U1 and U2. The two dual-row 20-pin headers, J2 and J3, are used for the I/O expander and keyscan features of U1 and U2, respectively.
Device Address Jumpers JU1-JU4
The MAX6955 EV kit board contains four jumpers in the top right-hand corner of the board. Jumpers JU1 and
4
_______________________________________________________________________________________
MAX6955 Evaluation Kit
JU2 select the device address for U1 and jumpers JU3 and JU4 select the device address for U2. Table 1 lists the device address selection for the various JU1 and JU2 jumper settings. Table 2 lists the device address selection for the various JU3 and JU4 jumper settings. Before changing the default device address for U1 or U2, read the Alphanumeric Entry for U1 and Alphanumeric Entry for U2 sections pertaining to required modifications for the Address (write) and Address (read) combo boxes. drives both U1 and U2 because OSC_OUT of U1 is directly connected to OSC of U2 with a trace on the board. It is also possible to drive the OSC pad of U1 with an external clock between 1MHz to 8MHz.
Evaluates: MAX6955
SCL, SDA, and GND Pads
The MAX6955 EV kit utilizes the PC's parallel port to generate a 2-wire interface for easy evaluation. Customers who wish to evaluate U1 and U2 using their own 2-wire interface must remove the parallel port cable from the board and attach the new 2-wire interface to the SCL, SDA, and GND pads located on the upper left-hand side of the MAX6955 EV kit board. The SCL, SDA, and GND pads are also useful for probing the 2-wire waveforms with a digital oscilloscope or logic analyzer.
OSC and OSC_OUT Pads
An OSC pad for U1 is provided for external clock operation and an OSC_OUT pad for U2 is also provided for cascading additional MAX6955 devices. When the OSC pad is unconnected, the internal oscillator of U1
Table 1. U1 Address Selection for Jumpers JU1 and JU2
JUMPER POSITION JU1 1-2 1-3 1-4 1-5 1-2 1-3* 1-4 1-5 1-2 1-3 1-4 1-5 1-2 1-3 1-4 1-5 JU2 1-2 1-2 1-2 1-2 1-3 1-3* 1-3 1-3 1-4 1-4 1-4 1-4 1-5 1-5 1-5 1-5 DEVICE ADDRESS (Write) 0xDE 0xDA 0xDC 0xD8 0xCE 0xCA* 0xCC 0xC8 0xD6 0xD2 0xD4 0xD0 0xC6 0xC2 0xC4 0xC0 (Read) 0xDF 0xDB 0xDD 0xD9 0xCF 0xCB* 0xCD 0xC9 0xD7 0xD3 0xD5 0xD1 0xC7 0xC3 0xC5 0xC1
Table 2. U2 Address Selection for Jumpers JU3 and JU4
JUMPER POSITION JU3 1-2 1-3 1-4 1-5 1-2 1-3 1-4 1-5 1-2 1-3 1-4 1-5 1-2 1-3 1-4 1-5* JU4 1-2 1-2 1-2 1-2 1-3 1-3 1-3 1-3 1-4 1-4 1-4 1-4 1-5 1-5 1-5 1-5* DEVICE ADDRESS (Write) 0xDE 0xDA 0xDC 0xD8 0xCE 0xCA 0xCC 0xC8 0xD6 0xD2 0xD4 0xD0 0xC6 0xC2 0xC4 0xC0* (Read) 0xDF 0xDB 0xDD 0xD9 0xCF 0xCB 0xCD 0xC9 0xD7 0xD3 0xD5 0xD1 0xC7 0xC3 0xC5 0xC1*
*Default for U1.
*Default for U2.
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5
Evaluates: MAX6955
MAX6955 Evaluation Kit
Figure 2. MAX6955 Schematic (Sheet 1 of 3)
VCC VCC A9 A18 SCL OSC_OUT OSC OSC A16 A12 A7 ISET 17 A19 A6 R11 100k 1% A9 A18 A17 AD0 A16 A12 AD1 A19 A18 A17 A16 A15 A14 A13 A12 A11 A17 A16 A12 A7 VCC R9 47k BLINK 3 D11 VCC R10 47k BLINK2 D12 2 SCL AD1 1 SCL AD0 SDA 3 5 1 3 2 GND VCC JU1 4 5 1 A9 A18 A17 A16 VCC JU2 4 A12 A5 A19 A4 SDA A19 A4 A9 A18 A7 A19 A6 A15 A11 A3 A2 A5 V+ Q2 2 VCC SDA 4 SDA R4 47k 3 D10 1 2 SCL P1 P2 P3 SDA P4 A1 Q1 A3 A4 VCC A5 A6 A7 3 3 D9 1 2 SDA 1 N1 SDA A9 A10 15 08 22 09 A8 07 14 13 06 12 05 04 11 10 03 9 02 2 R8 47k A2 8 01 018 31 7 00 P4 AD1 3 1 R6 13k 36 6 35 P3 34 P2 AD0 3 R7 47k 2 P1 P0 P0 VCC 1 1 BLINK GND BLINK N2 SCL 32 18 SCL 5 SCL GND 16 C2 12pF 20 C3 0.1F C4 1.0F 19 A17 A14 OSC_OUT V+ R2 13k 1 R1 100k 3 33 A1 21 A13 A10 R3 47k
6
U1 MAX6955
14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I D1 14 5 K J 13 6 G2 G1 12 7 D A 11 8 DP LUMEX CC_2 10 9 C LDD-F5406RI B 3 A10 A13 A3 A14 A15 A11 A1 A4 A5 14-SEGMENT--DUAL DIGIT 18 1 F E 17 2 G M 16 3 CC_1 15 4 L I 14 D2 5 J K 13 6 G1 G2 12 7 A D 11 8 CC_2 DP LUMEX 10 9 C LDD-F5406RI B R5 100k A10 A13 A5 A14 A15 A11 A1 A6 A3 30 017 29 016 28 015 27 014 26 013 25 012 24 011 23 010 14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I 14 5 D3 K J 13 6 G2 G1 12 7 D A 11 8 DP CC_2 LUMEX 10 9 C LDD-F5406RI B A10 A13 A7 A14 A15 A11 A1 A8 A3 14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I 14 D4 5 K J 13 6 G2 G1 12 7 D A 11 8 DP CC_2 LUMEX 10 9 C LDD-F5406RI B
J1-1
N.C.
J1-4
N.C.
J1-6
N.C. J1-2
J1-7
N.C.
J1-8
N.C.
J1-9
N.C.
J1-14
N.C.
J1-12
J1-16
N.C.
J1-17
N.C.
J1-5
J1-18
J1-19
J1-13
J1-20
J1-21
J1-22
J1-3
J1-23
J1-24
J1-25
J1-11
_______________________________________________________________________________________
J1-10
J1-15
B9 B18 B1 B14 B15 B11 B3 B2 B5 B17 B16 B12 B7 C5 0.1F C6 1.0F B19 B6 B13
B10
VCC 33 OSC_OUT OSC V+ 19 V+ 20 21
VCC OSC_OUT OSC_OUT
VCC
GND
C1 22F
14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I D5 14 5 K J 13 6 G2 G1 12 7 D A 11 8 DP LUMEX CC_2 10 9 C LDD-F5406RI B
U2 MAX6955
SDA B18 B17 B16 B12 B7 AD0 AD1 018 017 016 015 014 013 012 25 B13 B12 B11 24 011 23 010 26 B14 27 B15 28 B16 B17 30 29 B18 B17 B16 B12 B7 B19 B4 31 B19 B9 B18 6 AD1B 3 AD0B B19 B6 4 SDA ISET 17 B9
B10 B13 B3 B14 B15 B11 B1 B4 B5
Figure 2. MAX6955 Schematic (Sheet 2 of 3)
SCL SDA BLINK2 P0_B P1_B P2_B P3_B P4_B B1 B2 SDA B3 B4 B5 B6 B7 B8 B9 B10 15 08 22 09 14 07 13 06 12 05 11 04 10 03 02 9 8 01 7 00 36 P4 35 P3 34 P2 2 P1 1 P0 GND BLINK 32 18 5 SCL GND 16 R12 100k 1% 14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I 14 D6 5 J K 13 6 G1 G2 12 7 A D 11 8 DP LUMEX CC_2 10 9 C LDD-F5406RI B B10 B13 B5 B14 B15 B11 B1 B6 B3 14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I 14 5 D7 K J 13 6 G2 G1 12 7 D A 11 8 DP LUMEX CC_2 10 9 C LDD-F5406RI B B9 B18 B17 B16 B12 B5 B19 B4 B10 B13 B7 B14 B15 B11 B1 B8 B3 14-SEGMENT--DUAL DIGIT 18 1 E F 17 2 M G 16 3 CC_1 15 4 L I 14 D8 5 K J 13 6 G2 G1 12 7 D A 11 8 DP LUMEX CC_2 10 9 C LDD-F5406RI B
VCC JU3 4
3
5
1
2
SCL
AD0B
VCC JU4 4
3
5
1
2
SCL
Evaluates: MAX6955
_______________________________________________________________________________________
AD1B
MAX6955 Evaluation Kit
7
Evaluates: MAX6955
MAX6955 Evaluation Kit
Figure 2. MAX6955 Schematic (Sheet 3 of 3)
VCC J3-1 J3-2 J3-3 J3-4 P0 R14 47k P1 R15 47k P2 R16 47k P3 R17 47k P4 R18 47k P0_B R19 47k P2_B P1_B P0_B N.C. N.C. N.C. N.C. P4_B P2_B R21 47k P3_B R22 47k P1_B R20 47k P0 J3-5 J3-6 J3-7 J3-8 J3-9 J3-10 J3-11 J3-12 J3-13 J3-14 J3-15 J3-16 J3-17 J3-18 J3-19 J3-20 P3_B P4_B B1 B2 B3 B4 B5 B6 B7 P1 P2 P3 P4 A1 A2 A3 A4 A5 A6 A7 A8 VCC B8 R13 47k VCC
8
J2-1
N.C.
J2-2
N.C.
J2-3
N.C.
J2-4
N.C.
J2-5
J2-6
J2-7
J2-8
J2-9
J2-10
J2-11
J2-12
J2-13
J2-14
J2-15
J2-16
J2-17
J2-18
J2-19
_______________________________________________________________________________________
J2-20
MAX6955 Evaluation Kit Evaluates: MAX6955
Figure 3. MAX6955 EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 9
MAX6955 Evaluation Kit Evaluates: MAX6955
Figure 4. MAX6955 EV Kit PC Board Layout--Component Side 10 ______________________________________________________________________________________
MAX6955 Evaluation Kit Evaluates: MAX6955
Figure 5. MAX6955 EV Kit PC Board Layout--Solder Side ______________________________________________________________________________________ 11
MAX6955 Evaluation Kit Evaluates: MAX6955
Figure 6. MAX6955 EV Kit Component Placement Guide--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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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