MAX1241 MAX1241BCPA MAX872CPA MAX1241EVKIT-DIP MAX1241EVL11-DIP EVL11 68L11D

MAX1241 Evaluation Kit The MAX1241 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the 3V, 12-bit

19-1160; Rev 0; 11/96 MAX1241 MAX1241 Evaluation Kit The MAX1241 MAX1241 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the 3V, 12-bit MAX1241 MAX1241 analog-to-digital converter. The MAX1241 MAX1241 evaluation system (EV system) is a complete, low-cost, single-channel data-acquisition system consisting of a MAX1241 MAX1241 EV kit and a Maxim 3V microcontroller (µC) module. IBM PC-compatible software provides a handy user interface to exercise the MAX1241 MAX1241's features. Source code is provided. Order the EV system for comprehensive evaluation of the MAX1241 MAX1241 using a personal computer. Order the EV kit if you have already purchased the 3V µC module with another Maxim EV system, or for custom use in other µC-based systems. _MAX1241 MAX1241 EV Kit Component List DESIGNATION QTY C1 1 3 0.1µF capacitors C4 1 4.7µF capacitor C5 1 10µF capacitor C7 1 0.047µF capacitor J1 1 2x20 header J7 1 6-pin header JU1, JU2 2 2-pin headers R1 1 1k resistor U1 1 MAX1241BCPA MAX1241BCPA U2 1 MAX872CPA MAX872CPA None 1 PC board o Proven PC Board Layout o Complete Evaluation System o Convenient On-Board Test Points o Data-Logging Software o Source Code Provided o Fully Assembled and Tested _Ordering Information PART MAX1241EVKIT-DIP MAX1241EVKIT-DIP MAX1241EVL11-DIP MAX1241EVL11-DIP TEMP. RANGE 0°C to +70°C 0°C to +70°C BOARD TYPE Through-Hole Through-Hole 0.01µF capacitor C2, C3, C6 _Features DESCRIPTION _MAX1241 MAX1241 EVL11 EVL11 Component List QTY 1 1 DESCRIPTION MAX1241EVKIT-DIP MAX1241EVKIT-DIP 68L11D 68L11D µC Module (68L11D 68L11D MODULE) MAX1241 MAX1241 EV System _Quick Start The MAX1241 MAX1241 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Copy the files from the distribution disk to your hard disk or to blank floppy disks. The MAX1241 MAX1241 EV kit software should be in its own directory. The necessary files are in the distribution disk's root directory, and the source code is in the SOURCE subdirectory. The SOURCE subdirectory is not required to operate the EV kit. 2) Make sure that jumper JU1 is open and JU2 is closed (Table 1). 3) Carefully connect the boards by aligning the MAX1241 MAX1241 EV kit's 40-pin header with the 68L11D 68L11D module's 40-pin connector. Gently press them together. The two boards should be flush against one another. 4) Connect a 5V DC power source (16V max) to the µC module. This is located at the terminal block next to the on/off switch, in the upper-right corner of the µC module. Observe the polarity marked on the board. _ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Evaluates: MAX1241 MAX1241 _General Description Evaluates: MAX1241 MAX1241 MAX1241 MAX1241 Evaluation Kit 5) 6) 7) Connect a cable from the computer's serial port to the µC 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 25-pin to 9-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. Start the MAX1241 MAX1241 software on the IBM PC by setting the current directory to match the directory containing the Maxim programs, then type the program name "MAX1241 MAX1241". Do not turn off or disconnect the µC module while the program is running; if you do, you will have to restart the program. The program will ask which port the µC module is connected to. Press the space bar until the correct PC serial port is highlighted, then press ENTER. The MAX1241 MAX1241 program will be in terminal-emulation mode. 8) Download and run the RAM resident program on the µC module by pressing ALT+L (i.e., hold down the ALT key as you strike the L key). The program prompts you for the file name. Press the ENTER key to download and run the file. Changing the Reference Voltage The MAX872 MAX872 is a 2.5V reference. To supply a different external reference, open JU2 and apply the reference voltage between VREF and GND. Refer to the MAX1241 MAX1241 data sheet for reference voltage requirements. Table 1. Jumper Settings JUMPER 10) Press ALT+C to switch to the control-panel screen after the RAM resident program has been successfully downloaded. 11) Apply input signals to AIN on the MAX1241 MAX1241 EV kit board. Observe the readout on the screen. Table 1 lists the commands that are available from the control-panel screen. 12) Before turning off power to the MAX1241 MAX1241 EV kit, exit the program by pressing ALT+X. Detailed Description _of Hardware STATE FUNCTION Closed Tie SHDN to pin 30 on the µC module. Open (default) Force SHDN to float (device is in normal operating mode). Closed (default) Drive VREF with on-board MAX872 MAX872 reference. JU1 Turn on the power for the µC module. The module will display its logon banner and test its RAM. 9) Systems Using 3V and 5V Logic Systems that have both 3V and 5V logic must provide level translation for the MAX1241 MAX1241's data output. No level translation is necessary on the inputs. JU2 Open Disconnect on-board reference; drive VREF pad with a user-supplied reference. Detailed Description _ of Software The software allows the user to control the throughput rate, power-up delay, and reference-range setting. It also provides for data logging. Refer to Table 2 for a complete listing of the available features. The EV kit software program (KIT1241 KIT1241.L11) loaded into the 68L11D 68L11D module operates at a 6.7ksps throughput. For faster throughput, download the program FAST1241 FAST1241.L11 at step 9 of the MAX1241 MAX1241 EV System Quick Start section. This program has a throughput rate of approximately 14ksps. MAX1241 MAX1241 Stand-Alone EV Kit The MAX1241 MAX1241 EV kit provides a proven PC board layout to facilitate evaluation of the MAX1241 MAX1241. It must be interfaced to appropriate timing signals for proper operation. Refer to the MAX1241 MAX1241 data sheet for timing requirements. 2 _ MAX1241 MAX1241 Evaluation Kit KEY FUNCTION C Display the input codes in decimal format. D Delay between samples. Delays longer than one second are handled by the IBM PC; otherwise, the µC module handles the delay. Timing is approximate and should be verified with an oscilloscope. L Enable or disable data logging. If the -L command-line option was not specified, the L command prompts for a log-file name. O Oscilloscope demo. Samples are collected and discarded as quickly as possible. Observe waveforms and timing with an oscilloscope. P 1 Default to COM1 PC serial port. 2 Default to COM2 PC serial port. MONO For use with LCD or monochrome display. Write a marker into the data-log file. F5 FUNCTION Display the input voltages. F3 COMMAND Sample the input at high speed. The sampling rate is controlled by the P and D delays. Due to program overhead, the O and S commands operate at different rates. Timing should be verified with an oscilloscope. V Table 3. Command-Line Options when Starting MAX1241 MAX1241 Software Power-up delay. Timing is approximate and should be verified with an oscilloscope. When VREF = VDD, power-up delay is not necessary and should be set to zero. Power-up delay is used regardless of which power-cycling mode is selected. S Evaluates: MAX1241 MAX1241 Table 2. Command Reference Change the assumed value of VREF. , -Lfilename Open file "filename" for data logging, and enable the data-logging commands. VREF vvv Specify the actual measured voltage at the REF pin (nominally 2.5V). ? List command-line options. Select power-down mode. ALT+T Switch back to terminal mode. ALT+X Exit to DOS. _ 3 Evaluates: MAX1241 MAX1241 MAX1241 MAX1241 Evaluation Kit J2 TO 68L11D 68L11D MODULE GND J1-1 GND J1-2 GND J1-3 GND J1-4 VDD C5 10µF J6 VDD J1-7 VDD VDD J1-8 PA1/IN2 J1-28 J1-28 PA3/IN4/OUT5 J1-30 J1-30 J5 SCLK J1-33 J1-33 PA7/PAL/OUT1 J1-34 J1-34 MISO SCK J1-35 J1-35 J1-37 J1-37 J1-38 J1-38 J3 MAX1241 MAX1241 JU1 PA3/SHDN 3 6 PA6/OUT2 C2 0.1µF U2 SHDN CS 8 DOUT 7 1 SHDN DOUT AIN R1 1k VDD REF SCLK GND CS 2 4 C1 0.01µF 5 GND J4 DOUT SCLK C3 0.1µF U1 VDD CS TEST POINTS 2 J7-1 GND J7-2 VDD J7-3 7 VIN C7 0.047µF JU2 DOUT J7-6 8 CS J7-5 COMP SCLK J7-4 C4 4.7µF MAX872CPA MAX872CPA 1 SHDN C6 0.1µF 3 4 VOUT GND 6 5 Figure 1. MAX1241 MAX1241 EV Kit Schematic 4 AIN _ VREF (2.5V NOMINAL) MAX1241 MAX1241 Evaluation Kit Evaluates: MAX1241 MAX1241 Figure 2. MAX1241 MAX1241 EV Kit Component Placement Guide _ 5 Evaluates: MAX1241 MAX1241 MAX1241 MAX1241 Evaluation Kit Figure 3. MAX1241 MAX1241 EV Kit PC Board Layout-Component Side 6 _ MAX1241 MAX1241 Evaluation Kit Evaluates: MAX1241 MAX1241 Figure 4. MAX1241 MAX1241 EV Kit PC Board Layout-Solder Side _ 7