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19-2180; Rev 0; 11/01
MAX6951 Evaluation Kit
General Description
The MAX6951 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX6951 serially interfaced eight-digit LED display driver IC. The EV kit is powered by a user-supplied +4VDC to +6.5VDC power supply. A configurable +3.3V or user-configurable lowdropout (LDO) linear regulated power supply provides power for the entire EV kit. An SPITM-compatible serial interface is connected to an IBM PC-compatible computer's parallel port for easy evaluation. The EV kit can easily be reconfigured for interfacing with a user-supplied microcontroller (standalone operation). Windows(R) 95/98-compatible software provides a userfriendly interface to demonstrate the various features of the MAX6951 IC. The program is menu driven and offers a graphic interface with control buttons. Windows NT/2000 support is available; contact the factory for details.
Features
o Eight-Digit 7-Segment + dp Common-Cathode Display o SPI-Compatible Serial Interface o Configurable Built-In LDO Linear Regulated Power Supply Demonstrates +3.3V or Other Voltages o Reconfigurable for Stand-Alone Operation (with an External Microcontroller) o Easy-to-Use Menu-Driven Software o Includes Windows 95/98-Compatible Software o Assembled and Tested
Evaluates: MAX6951
Ordering Information
PART MAX6951EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 10F 20%, 16V X7R ceramic capacitor (1812) TDK C4532X7R1C106M 10F 10%, 10V tantalum capacitor (A) Kemet T494A106K010AS 0.1F 10%, 16V X7R ceramic capacitors (0603) Murata GRM39X7R104K016AD 47F, 6.3V low-ESR POSCAP (C) capacitor Sanyo 6TPA47M 18pF 5%, 50V COG ceramic capacitor (0603) Murata GRM39COG180J050AD 1F, 16V X7R ceramic capacitor (1206) Murata GRM42-6X7R105K016 Red two-digit 7-segment common-cathode LED displays (0.560in) Fairchild MAN6940 DESIGNATION D5, D6 J1 J2 R1, R2, R3 R4 R5, R6 U1 U2 U3 None None None None C7 1 QTY 2 1 1 3 1 2 1 1 1 1 1 1 1 DESCRIPTION 200mA, 25V Schottky diodes (SOT23) Fairchild BAT54C DB25 male right-angle connector 5-pin header 10k 5% resistors (0805) 93.1k 1% resistor (0805) Not installed (0805) MAX6951EEE (16-pin QSOP) MAX604ESA (8-pin SO) MAX1841EUB (10-pin MAX) MAX6951 PC board MAX6951 data sheet MAX6951 EV kit data sheet 3 1/2in software diskette, MAX6951 EV kit
C2
1
C3, C4
2
C5
1
C6
1
D1-D4
4
Windows is a registered trademark of Microsoft Corp. SPI is a trademark of Motorola, Inc. 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.
MAX6951 Evaluation Kit Evaluates: MAX6951
Component Suppliers
SUPPLIER Fairchild Kemet Murata Sanyo TDK PHONE 888-522-5372 864-963-6300 770-436-1300 619-661-6835 847-803-6100 FAX 972-910-8036 864-963-6322 770-436-3030 619-661-1055 847-390-4405
6) Observe as the program automatically detects the parallel port address of the MAX6951 EV kit and starts the main program. 7) Header J2 is provided to monitor the parallel port pins supplying the CLK_P, CS_P, DIN_P (+5V signals), and loopback signals. The CLK, CS, and DIN pads on the EV kit's left side are +3.3V level-shifted signals from the MAX1841 level translator. Both signal locations can be used for monitoring.
Note: When contacting suppliers, please indicate that you are using the MAX6951.
Quick Start
Required Equipment
Before you begin, the following equipment is needed: * IBM PC-compatible computer running Windows 95/98 * * * Computer monitor with 800 x 600 minimum screen resolution Parallel printer port (25-pin female socket on the back of the computer) Standard 25-pin, straight-through, male-to-female cable (printer extension cable) to connect the computer's parallel port to the MAX6951 EV kit DC power supply capable of supplying between +4V to +6.5V and at least 500mA current
Detailed Description of Software
Note: Words in boldface are user-selectable features in the software.
User Interface
The user interface is easy to operate. A mouse or the Tab key can be used to navigate among various items of the main display panel. Upon starting the program, the MAX6951 EV kit display is programmed to initialize in Normal mode, display 8-digits in No-decode mode, blinking at a Slow Rate with an 8/16 (50% duty cycle) display intensity, and display the contents of the initialized MAX6951 SRAM Plane P0 and P1 contents. The MAX6951 EV kit 8-digit LED display should alternate between HELLO---- and ----6951. Figure 1 is the main panel for the MAX6951 EV kit.
*
Procedure
Do not turn on the power until all connections are made. 1) Connect a cable from the computer's parallel port to the MAX6951 EV kit. Use a straight-through, 25-pin, female-to-male cable. The EV kit software uses a loopback connection to confirm that the correct port has been selected. 2) The MAX6951.EXE software program can be run from the floppy or hard drive. 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 95/98 Start menu. An uninstall program is included with the software. Click on the UNINSTALL icon to remove the EV kit software from the hard drive. 3) Connect the power-supply positive terminal to the VIN pad and negative terminal to the GND pad. 4) Turn on the power supply and set it to +4V. 5) Start the MAX6951 program by opening its icon in the Start menu.
Main Panel Display Controls
The Display mode group of radio buttons determines the mode of operation of the MAX6951 EV kit. Clicking on the Shutdown radio button puts the MAX6951 EV kit in shutdown mode. The display is blank and the EV kit draws the least amount of current in this mode. Selecting the Normal radio button places the MAX6951 EV kit in the normal mode of operation. Clicking on the Test radio button puts the MAX6951 EV kit in test mode. All eight digits and all segment LEDs on the MAX6951 EV kit are illuminated with a 50% duty cycle (8/16). To change the blink rate, click on one of the Blink Rate radio buttons. Once selected, the Blink Rate can be adjusted by using the Up-Down Arrows on the keyboard. The 7-segment digits on the computer monitor do not blink. Intensity of the MAX6951 EV kit LEDs can be adjusted by using the mouse to move the Intensity Control track bar. Once selected, the Intensity Control can be adjusted with the left-right arrows on the keyboard. The number of digits displayed is adjusted with the Digit Scan Limit button or list box. To set the scan limit to eight digits, click on the Eight Digits button or use the mouse to scroll the list box to the desired number of digits. Once
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MAX6951 Evaluation Kit Evaluates: MAX6951
Figure 1. Main Panel for MAX6951 EV Kit
the Digit Scan Limit list box is selected, the number keys can be used to change values. If one digit is desired, click on the One Digit button. The SRAM Data Planes group of radio buttons select which data plane is displayed on the computer monitor 7-segment digits and is updated when a digit value is changed. Selecting the Plane P0 radio button displays the contents of Plane P0 in the MAX6951. The program keeps track of data written to all registers in the MAX6951 hardware. Clicking on Plane P1 displays the contents of Plane P1 written to hardware. Selecting Plane P0 and P1 displays the contents of Plane P0 by default. To clear the MAX6951 SRAM Plane registers P0 and P1, click on the Clear Planes button.
decode mode. A in a Digit checkbox indicates that the digit is in hexadecimal decode mode. A blank Digit checkbox indicates the digit is in No-decode mode. Clicking on the All Digits button places all eight digits in hexadecimal decode mode or clicking on None places all digits in no-decode mode. When a digit is in Hexadecimal Decode mode, the digit's list box up-down arrows are used to select a value on the numbered keypad once the digit's list box has been selected. To activate a digit's decimal point, click on the digit's decimal point with the mouse or click again to deactivate the decimal point. For digits in no-decode mode, use the mouse to click on the desired segment of the digit's 7-segment display. Note that the digit's list box up-down arrows are disabled. To activate a digit's decimal point, click on the digit's decimal point with the mouse or click again to deactivate the decimal point. The left-side list box of each
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Hexadecimal Decode Mode
The Digit Hexadecimal Decode checkboxes and buttons select which digits are represented in hexadecimal
_______________________________________________________________________________________
MAX6951 Evaluation Kit Evaluates: MAX6951
Figure 2. SPI Utility Showing the Settings to Communicate with the MAX6951 EV Kit
digit displays the no-decode hex value written to the MAX6951 hardware. Digit 0 (left side) through digit 7 (right side) display the contents of the selected MAX6951 SRAM data plane, P0 or P1.
updates the main panel. Pressing the Clear Planes button clears SRAM Planes P0 and P1.
General-Purpose SPI Utility
There are two methods for communicating with the MAX6951 (Figure 2): through the Main Panel display or through the general-purpose SPI utility. The utility configures the SPI parameters such as clock polarity (CPOL), clock phase (CPHA), and chip select (CS) polarity. The fields where pin numbers are required apply to the pins of the parallel port connector. When using the SPI utility, the Main Panel display no longer keeps track of changes sent to hardware. The SPI utility is preconfigured for the proper setting of CPOL, CPHA, and CS. The utility only handles the data in byte (8-bit) format. Data that is longer than a byte must be handled as mul-
Pulldown Menus and Saving Data
All available functions except for changing a digit's value can be changed using the pulldown menu. Hot keys (Alt + underlined letter) provide an alternative to using the mouse to configure the MAX6951 EV kit. Pressing on the Save Data button saves all the current registers and SRAM (P0 and P1) data to the program's directory. Pressing on the Restore Data button retrieves the saved register and SRAM (P0 and P1) data and sends it to the MAX6951 EV kit hardware and
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_______________________________________________________________________________________
MAX6951 Evaluation Kit
tiple bytes. Thus, for the MAX6951 EV kit, 16-bit words must be broken into two 8-bit bytes. Set the bits list box to 16 so the clock sends 16 pulses on the CLK pin. The command byte is entered first and then the data byte. To write data to the MAX6951 EV kit hardware, enter the data into the field: Data bytes to be written. The data bytes must be hexadecimal and prefixed by 0x. Separate each byte with a comma. Press the Send Now button to write the data to the MAX6951 EV kit. For example, to set the MAX6951 EV kit's display intensity to 2/16, enter the command word 0x02 and data word 0x01, as: 0x02,0x01 and click the Send Now button. of the MAX6951 IC. The MAX6951 IC is configured to oscillate nominally at 4MHz by external capacitor C6 and resistor R4. The EV kit can be reconfigured for evaluating other frequencies by applying an external TTL/CMOS-compatible clock to the EXT_OSC pad and reconfiguring jumper JU7. The MAX6951's peak segment current is set to 20mA by
OPTIONAL USER EXTERNAL REGULATED PS +4V TO +6.5V (+2.7V TO +5.5V) POWER SUPPLY
Evaluates: MAX6951
Detailed Description of Hardware
The MAX6951 EV kit demonstrates the MAX6951 8-digit 7-segment + dp common-cathode LED display driver IC. The EV kit also features a MAX604 +3.3V LDO linear regulator providing up to 500mA for the MAX6951 and LEDs. The user can reconfigure JU6 to provide a voltage from +2.7V up to +5.5V to power the circuit. The EV kit's input requires a +4VDC to +6.5VDC power supply capable of supplying at least 500mA for a +3.3V evaluation. The EV kit's LDO linear regulator input voltage must be higher than the circuit voltage. Additionally, an externally regulated +2.7V up to +5.5V power supply can be used to power the EV kit, EXT_VCC after reconfiguring jumper JU1. The EV kit connects to an IBM-compatible PC computer parallel port, which permits easy evaluation of the EV kit. The EV kit's SPI-compatible serial interface is connected to a MAX1841 (U3) level translator. The translator level-shifts the computer's parallel port logic +5V signals to the EV kit's logic +3.3V or circuit voltage level chosen by the user. By reconfiguring the appropriate jumper (JU1), the translator can function with voltages down to +2.7V. The level translator's parallel port side is powered by parallel ports D5 to D7 data pins, diodes D5/D6, and capacitor C7, which provide approximately +5V to the translator DVCC input. The LDO linear regulator supplies power to the translator's output side. A five-pin header (J2) is provided for monitoring the +5V CLK_P, CS_P, DIN_P nonlevel-translated, and LOOPBACK signals coming from the parallel port cable. The EV kit can be easily reconfigured for stand-alone operation and can be connected to an external microcontroller for evaluation. Pullup resistors R1, R2, and R3 are provided on the EV kit for the MAX6951's CLK, CS, and DIN pins. PC board pads are provided for interfacing or monitoring the CLK, CS, and DIN +3.3V or circuit voltage level chosen by the user, level-translated pins
MAX604 LDO MAX6951 EV KIT
(*)
5V PC PARALLEL PORT CABLE 5V PC SIGNALS 5V
MAX6951 3.3V
MAX1841
EIGHT 7-SEGMENT DIGITS +3.3V SIDE * +3.3V OR USER-SETTABLE VOLTAGE +5V SIDE
Figure 3. MAX6951 EV Kit Level-Translation Functional Diagram
resistor R4. The parallel port signals are level translated and buffered from the EV kit by the MAX1841 level translator. However, the two sides are not galvanically isolated. Figure 3 shows the parallel port and level-translation interface for the MAX6951 EV kit.
Jumper Selection
MAX6951 EV Kit's Power Source The MAX6951 EV kit can be easily powered by a separate externally regulated power supply. The 2-pin jumper JU1 selects the power source for the EV kit circuit. The external power source must be in the +2.7V to +5.5V range and must be capable of supplying at least 500mA current. The output of the EV kit's built-in LDO power regulator must be isolated from the external power supply. Table 1 lists the jumper options.
Stand-Alone Configuration
The MAX6951 EV kit features several jumpers to reconfigure the EV kit for stand-alone operation or PC/software control. The 2-pin jumpers, JU2 to JU5, select the evaluation mode for the EV kit. Table 2 lists the jumpers to cut open or short for the desired evaluation mode. Note: All jumpers must be configured for only one mode at a time and the proper voltage selected for stand-alone mode.To select other output voltages
_______________________________________________________________________________________
5
MAX6951 Evaluation Kit Evaluates: MAX6951
Table 1. JU1 Functions
JUMPER JU1 JU1 JUMPER, PC BOARD TRACE Shorted Cut open JUMPER FUNCTION LDO linear regulator U2 supplies power LDO linear regulator U2 output isolated from EV kit's VCC pins EV KIT MODE LDO supplies +3.3V or user-selectable voltage* EXT_VCC pad supplies EV kit power, range +2.7V to +5.5V
*See JU6 for configuring the EV kit for +3.3V or user-selectable voltage.
Table 2. JU2 to JU5 Functions
JUMPER JU2 JU3 JU4 JU5 JU2 JU3 JU4 JU5 JUMPER, PC BOARD TRACE Cut open Cut open Cut open Cut open Shorted Shorted Shorted Shorted JUMPER FUNCTION U3 level translator CLK signal isolated from EV kit U3 level translator CS signal isolated from EV kit U3 level translator DIN signal isolated from EV kit U3 level translator VCC pin isolated U3 level translator provides CLK signal U3 level translator provides CS signal U3 level translator provides DIN signal U3 level translator powered from VCC rail EV KIT MODE Stand-alone, external controller connected to CLK pad* Stand-alone, external controller connected to CS pad* Stand-alone, external controller connected to DIN pad* U3 power disconnected, translator not required PC/software control through parallel port PC/software control through parallel port PC/software control through parallel port U3 power connected, translator required
*See JU6 and JU1 for configuring the EV kit's circuit voltage to match the external controller's voltage.
Table 3. JU6 Functions
SHORT LOCATION 1 and 2 2 and 3 (default) MAX604 SET PIN Connected to resistors R5 and R6 Connected to GND EV KIT MODE User-selected voltage, +2.7V to +5.5V range, VIN range +5.5V to +6.5V at 500mA +3.3V mode, VIN range +4.0V to +6.5V at 500mA
(+2.7V to +5.5V), the PC board trace shorting pins 2 and 3 of jumper JU6 must be cut open. Voltage-divider resistors R5, R6, and a wire shorting pins 1 and 2 of jumper JU6 must be installed. Use the following equation to determine the value for resistor R5. R6 can range up to 1.5M, and 249k is a good starting point: R5 = R6 x ((VOUT / 1.20) - 1) Evaluating Other Oscillator Frequencies The MAX6951 EV kit features a jumper to select the oscillation frequency source. The MAX6951 is configured to oscillate nominally at 4MHz by external components capacitor C6 and resistor R4. The user can connect an external TTL/CMOS clock oscillator to the EXT_OSC pad to evaluate other frequencies (1MHz min to 8MHz max). The 3-pin jumper JU7 selects the source for the MAX6951 oscillator frequency. Table 4 lists the various jumper options.
Table 4. JU7 Functions
JUMPER/SHORT LOCATION 1 and 2 (PC trace shorts pins 1 and 2) 2 and 3 (PC shorting trace cut open, wire soldered to pins 2 and 3) MAX6951 OSC PIN Connected to capacitor C6 Connected to EXT_OSC pad and TTL/CMOS clock OSCILLATOR FREQUENCY 4MHz, set by capacitor C6 and resistor R4 External TTL/CMOS clock range (1MHz to 8MHz) for the external oscillator
Troubleshooting
Problem: Cannot find the MAX6951 EV kit's parallel port connection. Ensure that the I/O extension cable is connected to a parallel port, and not a SCSI or other type of port. Verify
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VCC OUT EXT_VCC D5 BAT54C 16 VCC SEG9 SEG/DIG8 D6 BAT54C 12 SEG/DIG7 J1-8 J1-7 10 C4 0.1F 2 CLK SEG/DIG7 CS U1 SEG/DIG6 SEG/DIG5 13 SEG/DIG6 J1-9 VCC R2 10k CS 15 VCC VCC DIN JU5 CUT HERE DVCC 2 DVCC C3 0.1F 7 ISET SEG/DIG3 3 2 JU7 9 OSC SEG/DIG2 C6 18pF 5 1 4 SEG/DIG3 GND SEG/DIG2 EXT_OSC JU2 CUT HERE RST 7 SEG/DIG4 VCC 9 R4 93.1k 1% 3 1 DIN SEG/DIG5 R3 10k SEG/DIG8 11 SEG9 DVCC J1-6 1 IN C2 JU1 10F CUT HERE 10V VCC OUT VCC 3 GND CLK 4 OFF R6 OPEN 1 JU6 5 SET 2 SHORT PC TRACE 3 GND 6 R1 10k 7 OUT 8
VIN VIN +4 TO +6.5V
GND GND U2 GND
C1 10F 16V 2
MAX604
R5 OPEN
C5 47F 6.3V
VIN
Figure 4. MAX6951 EV Kit Schematic (Sheet 1 of 2)
C7 1F
MAX6951
14
SEG/DIG4
CLK_P 3 CIN U3 CLK 8
J2-1
CS_P 4 RIN
J2-2
MAX1841
DIN_P 5 DRRV GND
J2-3
8
J2-5 1 DATA
JU3 CUT HERE 10 IO JU4 CUT HERE GND 6
GND
SEG/DIG1
6
SEG/DIG1
LOOPBACK J1-13 J1-5 J1-11 J1-12 J1-14 J1-15 J1-16 J1-17 NC NC NC NC J1-19 J1-20 J1-21 NC J1-18 NC J1-22 J1-23 J1-24 J1-25 J1-10 NC
J2-4
J1-1
NC
CLK_P
J1-2
CS_P
J1-3
DIN_P
Evaluates: MAX6951
_______________________________________________________________________________________
J1-4
MAX6951 Evaluation Kit
7
Evaluates: MAX6951
MAX6951 Evaluation Kit
Figure 5. MAX6951 EV Kit Schematic (Sheet 2 of 2)
2A 10 SEG/DIG8 11 SEG9 2B 8 SEG/DIG7 2C 6 SEG/DIG6 2D 5 SEG/DIG5 DISPLAY MAN6940 FAIRCHILD 2F 7 SEG/DIG3 3 1C SEG/DIG7 2 6 SEG/DIG6 SEG/DIG6 2C SEG/DIG7 1C 8 3 SEG/DIG8 1B 2B SEG/DIG8 1B SEG/DIG8 15 10 15 12 SEG/DIG4 SEG9 1A SEG9 2A SEG9 1A 16 11 16 DISPLAY MAN6940 FAIRCHILD 2A 11 SEG9 10 2B D1 2E 2G 9 SEG/DIG1 2 1D 5 SEG/DIG5 SEG/DIG5 2D SEG/DIG7 SEG/DIG8 8 2C 2DP 13 SEG/DIG2 1 1E 12 SEG/DIG4 D3 2E SEG/DIG6 SEG/DIG7 6 1D 1 2D 2CC SEG/DIG6 5 1E 18 SEG/DIG4 D4 2E SEG/DIG5 11 SEG9 SEG/DIG4 1F 7 2F 17 1G 9 2G 18 SEG/DIG5 12 1F 17 SEG/DIG3 2F 2A 10 SEG/DIG8 SEG/DIG3 4 1DP 13 2DP SEG/DIG4 7 1G 4 SEG/DIG1 SEG/DIG2 2G 2B 8 SEG/DIG7 SEG/DIG2 14 1CC SEG/DIG3 SEG/DIG3 9 1DP 14 SEG/DIG2 SEG/DIG1 2CC 2DP 2C 6 SEG/DIG6 SEG/DIG1 SEG/DIG1 13 1CC 2CC 2D 5 SEG/DIG5 SEG/DIG2 D2 2E 12 SEG/DIG4 2F 7 SEG/DIG3 2G 9 SEG/DIG1 2DP 13 SEG/DIG2 2CC
8
DISPLAY MAN6940 FAIRCHILD
SEG9
16
1A
SEG/DIG8
15
1B
SEG/DIG7
3
1C
SEG/DIG6
2
1D
SEG/DIG5
1
1E
SEG/DIG4
18
1F
SEG/DIG3
17
1G
SEG/DIG2
4
1DP
SEG/DIG1
14
1CC
DISPLAY MAN6940 FAIRCHILD
SEG9
16
1A
SEG/DIG8
15
1B
SEG/DIG7
3
1C
SEG/DIG6
2
1D
SEG/DIG5
1
1E
SEG/DIG4
18
1F
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SEG/DIG3
17
1G
SEG/DIG2
4
1DP
SEG/DIG1
14
1CC
MAX6951 Evaluation Kit Evaluates: MAX6951
1.0"
1.0"
Figure 6. MAX6951 EV Kit Component Placement Guide-- Component Side
Figure 7. MAX6951 EV Kit PC Board Layout--Component Side
1.0"
Figure 8. MAX6951 EV Kit 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ______________________9 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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