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19-2163; Rev 0; 9/01
MAX7428 Evaluation Kit
General Description
The MAX7428 evaluation kit (EV kit) is an assembled and tested circuit board that demonstrates the MAX7428 standard-definition video reconstruction filter and buffer. Windows (R) 98/2000 software provides a handy user interface to exercise the features of the MAX7428. Order the complete EV system (MAX7428EVC16) for comprehensive evaluation of the MAX7428 using a PC. Order the EV kit (MAX7428EVKIT) if the 68HC16MODULE module has already been purchased with a previous Maxim EV system, or for custom use in other microcontroller (C) based systems. o Proven PC Board Layout o Convenient On-Board Test Points o Fully Assembled and Tested
Features
Evaluates: MAX7428
Ordering Information
PART MAX7428EVKIT MAX7428EVC16 TEMP RANGE 0C to +70C 0C to +70C INTERFACE TYPE User supplied Windows software
MAX7428EVC16 Parts List
QTY 1 1 DESCRIPTION MAX7428EVKIT 68HC16MODULE-DIP SUPPLIER Sanyo USA
Component Supplier
TELEPHONE 619-661-6835 FAX WEBSITE 619-661-1055 www.sanyo.com
Component List
REFERENCE C1, C4-C12 C2 C3 C13 C14, C15, C16 C17, C18, C19 FB1, FB2 INA1, INA2, INA3, INB1, INB2, INB3, OUT1, OUT2, OUT3 QTY 10 1 1 1 3 0 2 DESCRIPTION 0.1F, 10V X7R ceramic capacitors (0805) 0.01F, 10V X7R ceramic capacitor (0805) 1000pF, 10V X7R ceramic capacitor (0805) 10F, 10V tantalum capacitor (B) 220F, 6V aluminum electrolytic capacitors (8 x 10.5) Sanyo 6CV220EX Open (reserved for Sanyo 4CV820EX) Ferrite beads (0805) Murata BLM21A102S REFERENCE J1 JU1-JU4 R1, R2, R3 R4, R5, R6 R7 R8-R13 TB1 U1, U2, U3 None None 9 BNC female jacks QTY 1 4 3 3 1 6 1 3 1 1 DESCRIPTION 2 x 20 right-angle socket 2-pin headers 301k 1% surface-mount resistors (1206) 75 1% surface-mount resistors (1206) 10k 5% surface-mount resistor (1206) 1M 5% surface-mount resistors (1206) (optional) 0.200in screw terminal block MAX7428EKA PC board 3.5in software disk
Quick Start
Recommended Equipment
Before you begin, the following equipment is needed: * * MAX7428EVKIT and 68HC16MODULE interface board A small DC power supply, such as a 12VDC 0.25A plug-in transformer, or a 9V battery
Windows is a registered trademark of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products 1
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.
MAX7428 Evaluation Kit Evaluates: MAX7428
* * * A computer running Windows 98/2000 A spare serial communications port, preferably a 9-pin plug A serial cable to connect the computer's serial port to the 68HC16MODULE
Table 1. Jumper Functions
JUMPER JU1 JU1 JU2 JU2 JU3 JU3 JU4 POSITION Closed Open* Closed Open* Closed Open* Closed* FUNCTION U1 common sync U1 sync open U2 common sync U2 sync open U3 common sync U3 sync open U1, U2, U3 are powered by 5V from the 68HC16 module U1, U2, U3 require external 5V power source applied at terminal block TB1
1) With the power off, connect a 7VDC to 20VDC power supply to the C module at the terminal block located next to the on/off switch, along the top edge of the C module. Observe the polarity marked on the board. 2) Carefully connect the boards by aligning the 40-pin header of the MAX7428 EV kit with the 40-pin connector of the 68HC16MODULE-DIP module. Gently press them together. The two boards should be flush against one another. 3) Connect a cable from the computer's serial port to the C module. If using a 9-pin serial port, use a straight-through, 9-pin female-to-male cable. If the only available serial port uses a 25-pin connector, a standard 9-pin to 25-pin adapter is required. The EV kit software checks the modem status lines (CTS, DSR, DCD) to confirm that the correct port has been selected. 4) Install the EV system software on your computer by running the INSTALL.EXE program on the floppy
JU4
Open
*Indicates default configuration
disk. The program files are copied and icons are created for them in the Windows Start menu. 5) Ensure that the jumper settings are in the default position (Table 1). 6) Turn on the power supply. 7) Start the program by opening its icon in the Start menu. The program prompts you to connect the C
Figure 1. MAX7428EVKIT Software 2 _______________________________________________________________________________________
MAX7428 Evaluation Kit
module and turns its power on. Slide SW1 to the ON position. Select the correct serial port, and click OK. The program automatically loads code into the module. 8) Click on Initialize MAX7428EVKIT to initialize the three devices on the MAX7428EVKIT board. 9) Connect video signal sources to INA1..INA3 and INB1..INB3. 10) Connect video display to OUT1..OUT3. 11) To verify the setup, switch all devices from input A to input B by selecting input B in the Control Word and then clicking Broadcast.
Detailed Description of Hardware
Master/Slave Synchronization
One MAX7428 can control the clamping on the other two. First, assign unique chip addresses by clicking Initialize MAX7428EVKIT. Next, set the configuration word to SYNCIO in and click Broadcast. Finally, select the device that is the master, and write configuration word with SYNCIO out. Connect the sync signals together by closing jumpers JU1, JU2, and JU3.
Evaluates: MAX7428
Detailed Description of Software
Selecting the Device Address
At power-on reset, all devices are assigned address 0000. To assign unique addresses, each device must be initialized, starting with the device with the largest CEXT value. Clicking Initialize All Devices automatically assigns addresses from the Unused IDs list. Manually assign addresses by dragging the desired address from the Unused IDs list into the address assignment grid. To reassign a chip's address, the chip must be reset. The Reset Chip button resets only the selected chip, while Reset All Chips broadcasts the reset command to all chips. Select the desired chip by picking it from the address assignment grid, or by dropping down the CEXT capacitor combo box.
Controlling the MAX7428
Set the command word drop-down combo boxes (SYNCIO, Input A/B, Filtered/Unfiltered, etc.). To write to a single device, click the Write button. To write to all devices, click the Broadcast button. To read back the device configuration, click the Read button. Readback data appears underneath the combo boxes.
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3
Evaluates: MAX7428
C11 0.1F INA3 BNC R12 * VCC C12 0.1F INB3 BNC R7 10k DATA 6 DATA R8 * VCC 2 VCC INB U1 3 SYNCIO3 GND3 C4 0.1F C8 0.1F INB1 BNC R9 * C14 220F R4 75 OUT 8 C17 OPEN 4 GND SYNCIO 5 SYNCIO1 OUT1 BNC INA 1 INA1 BNC R6 75 OUT C19 OPEN 4 GND SYNCIO 5 8 OUT3 BNC C7 0.1F R13 * C16 220F VCC 2 VCC U3 INB 3 C6 0.1F
MAX7428 Evaluation Kit
Figure 2. MAX7428 EV Kit Schematic
6 DATA INA 1
4
MAX7428
7 REXT R3 301k 1%
J1-27
C3 1000pF
J1-1
MAX7428
7 REXT
J1-2 C9 0.1F C1 0.1F INA2 BNC R10 * VCC 2 VCC U2 R5 75 OUT C18 OPEN 4 GND VCC JU4 JUMPER TB1-1 C13 10F 10V TB1-2 SYNCIO 5 SYNCIO2 GND2 JU2 JUMPER 8 R11 * C15 220F OUT2 BNC INB 3 INB2 BNC C5 0.1F C10 0.1F
JU3 JUMPER
J1-3 6 DATA INA 1 R1 301k 1%
J1-4
FB2
GND1
JU1 JUMPER
MAX7428
7 REXT R2 301k 1%
C2 0.01F
_______________________________________________________________________________________
* R8-R13 OPTIONAL (REFER TO MAX7428 DATA SHEET).
J1-7
FB1
J1-8
MAX7428 Evaluation Kit Evaluates: MAX7428
; Maxim One-Pin Protocol used on MAX7428 (Excerpt) ; Complete source code is included on MAX7428 EVKIT disk. ; ; High-level GUI program sends commands to the MOPP code. ; On Entry: register Z points to null-terminated command string. ; On Exit: _readback contains the value read by the (R) bits. CmdWLoop: ldaa 0,z ; get first character aiz #1 ; increment string pointer cmpa #0 ; null character terminates command string beq CmdWDone cmpa #'0' ; digit zero makes a 5usec pulse bne CmdWNot0 ldd #DoZeroTimingValue jsr DoPulse_D ; call delay subroutine, delay value in register D bra CmdWLoop ; jump back to loop, process next character CmdWNot0: cmpa #'1' ; digit one makes a 30usec pulse bne CmdWNot1 ldd #DoOneTimingValue jsr DoPulse_D ; call delay subroutine, delay value in register D bra CmdWLoop ; jump back to loop, process next character CmdWNot1: cmpa #'2' ; digit two makes a 100usec pulse bne CmdWNot2 ldd #DoWPTimingValue jsr DoPulse_D ; call delay subroutine, delay value in register D bra CmdWLoop ; jump back to loop, process next character CmdWNot2: cmpa #'A' ; letter A makes long delay before initialization bne CmdWNotA jsr EXECUTE_DELAY_A bra CmdWLoop ; jump back to loop, process next character CmdWNotA: cmpa #'B' ; letter B makes long delay during initialization bne CmdWNotB jsr EXECUTE_DELAY_B bra CmdWLoop ; jump back to loop, process next character CmdWNotB: cmpa #'H' ; letter H makes 5usec delay without pulsing the data signal bne CmdWNotH ldd #DoWH5usecTimingValue jsr DoPulseDly ; call idle delay subroutine, delay value in register D bra CmdWLoop ; jump back to loop, process next character CmdWNotH: cmpa #'R' ; letter R samples input from MAX7428 (LSB first) bne CmdWNotR ; make data an input... BCLR PDDR,#BitBangPin ; make SHDN an input, so it floats. ; with no delay code: 5.20 usec from end of prompt to sample ; read data value... ldaa GPTPDR BCLR GPTPDR,#DebugReadPin ; debug strobe aslw _readback,y anda #BitBangPin ; drive I/O high cmpa #0 beq CmdWRskip inc _readback+1,y CmdWRskip: ; make data an output BSET GPTPDR,#DebugReadPin ; debug strobe BSET GPTPDR,#BitBangPin ; drive I/O high BSET PDDR,#BitBangPin ; make sure SHDN is an output bra CmdWLoop ; jump back to loop, process next character CmdWNotR: ; all other characters are ignored bra CmdWLoop ; jump back to loop, process next character CmdWDone: rts ; return to main program
Listing 1. Simplified Interface _______________________________________________________________________________________ 5
MAX7428 Evaluation Kit Evaluates: MAX7428
Figure 3. MAX7428 EV Kit Component Placement Guide-- Component Side
Figure 4. MAX7428 EV Kit PC Board Layout--Component Side
Figure 5. MAX7428 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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