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| 19-1197; Rev 0; 3/97 E MODUL 6811D E AILABL AV MAX1202 Evaluation Kit ____________________________Features o Proven PC Board Layout o Complete Evaluation System o Convenient On-Board Test Points o Data-Logging Software o 3V/5V Logic Interface o Fully Assembled and Tested _______________General Description The MAX1202 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1202 evaluation kit (EV kit) and a Maxim 3V 68L11D microcontroller (C) module. The MAX1202 is a low-power, +5V, 8-channel, 12-bit analog-to-digital converter (ADC) that connects directly to 3V and 5V microprocessors (Ps). Windows 3.1TM/ Windows 95TM software provides a handy user interface to exercise the MAX1202's features. Order the EV system for comprehensive evaluation of the MAX1202 using a personal computer. Order the EV kit if you have already purchased the 68L11D C module with a previous Maxim EV system, or for custom use in other C-based systems. The MAX1202 EV kit and EV system can also be used to evaluate the MAX1203. Simply order a free sample of the MAX1203BCPP along with the MAX1202 EV kit. For 3V-only applications, refer to the MAX147 data sheet. Evaluates: MAX1202/MAX1203 ______________Ordering Information PART MAX1202EVKIT-DIP MAX1202EVL11-DIP TEMP. RANGE 0C to +70C 0C to +70C BOARD TYPE Through-Hole Through-Hole ____________________Component List DESIGNATION C1-C8, C13 C9, C10, C11, C14, C15 C12 J1 JU1, JU2 JU3 JU4 R1-R8 TP1 U1 U2 U3 None None QTY 9 5 1 1 2 1 0 8 1 1 1 1 1 1 1 DESCRIPTION 0.01F ceramic capacitors 0.1F ceramic capacitors 4.7F, 10V tantalum capacitor 2 x 20 right-angle socket 3-pin jumper blocks 2-pin jumper block Open 300, 5% resistors 8-pin header Maxim MAX1202BCPP 20-pin socket Maxim ICL7660CPA 78L05 voltage regulator PC board Software disk, "MAX1202 EVALUATION KIT" MAX1202EVL11 ___________System Component List PART MAX1202EVKIT-DIP 68L11DMODULE QTY 1 1 DESCRIPTION MAX1202 Evaluation Kit 68L11D C Module _____MAX1202 Stand-Alone EV Kit The MAX1202 EV kit provides a proven PC board layout to facilitate evaluation of the MAX1202. It must be interfaced to appropriate timing signals for proper operation. Refer to the MAX1202 data sheet for timing requirements. Cut JU4 and apply the +5V analog supply between the +5V pad and the pad marked GND. Connect the VLOGIC pad to the microprocessor's power supply. Set JU1 to the 2-3 position (VSS = -5V) to allow input signals between 4V (Table 1). Windows is a registered trademark of Microsoft Corporation. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX1202 Evaluation Kit Evaluates: MAX1202/MAX1203 ______________MAX1202 EV System The MAX1202 EV system operates from a usersupplied 9V to 15V DC power supply. The Maxim 68L11D 3V C board uses a MAX667 linear regulator to generate the 3V logic supply. The MAX1202 board uses a 78L05 linear regulator to generate its own 5V analog supply. No level translators are necessary because the MAX1202 VL pin is connected to the 3V logic supply. Table 1. Jumper Functions JUMPER JU1 STATE 1-2 2-3 Open 1-2 2-3 FUNCTION VSS tied to GND VSS tied to -5V VSS must be supplied by the user. SHDN tied to GND; power-down SHDN tied to +5V; internal compensation SHDN floating; external compensation REFADJ = +5V; VREF must be supplied by the user. REFADJ = open; VREF = 4.096V internal reference (MAX1202) Quick Start 1) Install the MAX1202 EV kit software on your computer by running the INSTALL.EXE program on the floppy disk. The Windows 3.1 Program Manager (or the Windows 95 Start Menu) copies the program files and creates icons for them. 2) Check the jumper settings on the EV board. Refer to Tables 1 and 2. 3) Carefully connect the boards by aligning the EV kit's 40-pin header with the C module's 40-pin connector. Gently press them together. The two boards should be flush against one another. 4) Connect a 9V to 15V DC power source to the C module at the terminal block located next to the on/off switch, in the upper-right corner of the C module. Observe the polarity marked on the board. 5) 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 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. 6) Start the MAX1202 program by opening its icon in the Program Manager (or Start Menu). 7) The program will prompt module and turn its power position. Select the correct The program automatically to the module. you to connect the C on. Slide SW1 to the on serial port and click OK. downloads KIT1202.L11 JU2 Open Closed JU3 Open JU4 Current-sense jumper. The Closed MAX1202 draws its +5V analog (default trace) supply through this trace. Open Do not operate kit with JU4 open. Table 2. Default Jumper Settings JUMPER JU1 JU2 JU3 JU4 DEFAULT STATE 2-3 2-3 Open Closed FUNCTION VSS tied to -5V SHDN tied to +5V REFADJ = open; VREF = 4.096V internal reference (MAX1202) The MAX1202 draws its +5V analog supply through this trace. Evaluating the MAX1203 To evaluate the MAX1203, turn off the power to the EV kit, close JU3, and replace U1 with a MAX1203BCPP. Connect the external voltage reference to the VREF pad. No other hardware changes are necessary. Refer to the section Changing the Reference Voltage. 8) Apply input signals to the CH0-CH7 inputs at the right edge of the MAX1202 EV board. Observe the readout on the screen. 2 _______________________________________________________________________________________ MAX1202 Evaluation Kit __Detailed Description of Software Shutdown Power Cycling The MAX1202 can be shut down between conversions to reduce average supply-current demand. From the "Power" menu, select full power-down (FULLPD) or fast power-down (FASTPD) mode. In fast power-down mode, the bandgap reference remains active. The amount of power saved depends primarily on how long the part is off between conversions. The conversion accuracy depends on the power-up delay, the reference capacitor, and the time in power-down. Adjust offtime with the "Delay Between Samples" command. Adjust on-time with the "Power-Up Delay" command. Using an adequate power-up delay ensures conversion accuracy during power-cycling modes. The reference must be allowed enough time to stabilize before the measurement is performed. The "Power-Up Delay" command controls power-up delay. Increase the delay until accuracy is constant. The power-up delay requirement depends on the off-time (delay between samples) and the value of the reference capacitor (C12). The MAX1202 EV kit software performs power-up by starting a conversion in FASTPD mode and discarding the reading. FASTPD mode turns on the reference, but leaves the MAX1202's other circuitry powered down. An accurate reference-voltage measurement can be performed after the power-up delay is complete. The MAX1203 requires an external reference, so FULLPD mode can always be used, assuming the external reference is always stable when measurements are performed. In this case, set power-up delay to 0. subsequent line of the log file contains all enabled channels, separated by commas, tabs, or spaces. The program continues to write data to the log file until the "Done" command is selected from the "Log" menu. Evaluates: MAX1202/MAX1203 High-Speed Data Sampling The high-speed sampling commands can be used for sampling rates over 10 samples/sec. Data can be collected from any single channel at high speed, using the commands on the "Sample" menu. First select the number of samples. Then set the sampling rate either by inserting a delay between samples, or by choosing one of the preset sample rates. Use the "Collect" command to begin collecting data. After the samples are collected, the data is automatically uploaded to the host and graphed. Additionally, the data can be saved to a file. Changing the Reference Voltage The MAX1202 EV kit software assumes a 4.096V reference voltage, unless otherwise specified. The reference-voltage assumption can be changed using "Set Reference Voltage" under the "Device" menu. If an external reference is used, it must have a temperature coefficient of 20ppm/C or less to achieve accuracy to within four LSBs over the 0C to +70C range. For 12bit accuracy over this range, the reference must have a temperature coefficient of 4ppm/C or less. Detailed Description ________________________of Hardware Components The MAX1202 (U1) is an 8-channel, 12-bit, low-power analog-to-digital converter (ADC) with serial interface and shutdown. R1-R8 and C1-C8 are anti-aliasing input filters. The analog supply rails are VDD, VSS, and GND. The digital interface is powered by the VL pin. The SHDN jumper controls hardware shutdown and selects internal/external-compensation mode. Refer to the MAX1202 data sheet for more information. The ICL7660 (U2) is a charge pump that converts +5V to -5V for VSS. The 78L05 (U3) is a +5V linear regulator that provides a clean analog supply for the MAX1202. Measuring Supply Current On the EV board, the MAX1202 draws all of its +5V analog power through jumper JU4, which is wired closed when the board is shipped from the factory. To measure the MAX1202's supply current, modify the board (with the power off) by cutting jumper JU4 and connecting a current meter across JU4. Low-Speed Data Logging The RS-232 serial link limits the data-logging sample rate to no more than 10 samples/sec. The "Log" menu can be used to write data to a user-specified file in comma-spaced-value text format. From the "Log" menu, choose "Select Channels", and select the channels you want to log. Then choose the "New Log File" command from the "Log" menu. Once a log file has been opened, it can be paused or resumed with the "Pause" command. One complete line of data is written after all enabled channels have been sampled. The first line of the log file contains the column headings. Each Input Filtering The MAX1202 EV kit has an RC filter on each input with a time constant () of approximately 3s (R = 300, C = 0.01F). The MAX1202's acquisition time with a 2MHz clock is 1.5s. The RC filter's settling time can increase the acquisition time required for full accuracy when switching input channels. _______________________________________________________________________________________ 3 MAX1202 Evaluation Kit Evaluates: MAX1202/MAX1203 +5V R1 300 CH0 R2 300 CH1 R3 300 CH2 R4 300 CH3 R5 300 CH4 R6 300 CH5 R7 300 CH6 R8 300 CH7 C1 0.01F 2 C2 0.01F 3 C3 0.01F 4 C4 0.01F 5 C5 0.01F 6 C6 0.01F 7 C7 0.01F 8 C8 0.01F 9 VSS SHDN CH7 GND JU3 +5V VSS REFADJ 12 C13 0.01F 11 C12 4.7F 10V CH5 DOUT CH1 1 1 CH0 VDD 20 C15 0.1F 19 JU4 U3 +9V TO 78L05 3 +15V OUT IN COM 2 J1-5 J1-6 U1 MAX1202 SCLK J1-37 CH2 CS 18 J1-31 CH3 DIN 17 J1-36 CH4 SSTRB 16 J1-29 15 J1-35 J1-7 CH6 VL 14 C14 0.1F 13 GND J1-1 J1-2 REFADJ J1-3 J1-4 VREF VLOGIC J1-8 C11 0.1F 1 +5V 8 V+ 2 JU1 3 10 SHDN REF +5V OSC 7 5 2 -5V C9 0.1F C10 0.1F 2 3 JU2 1 1 6 3 N.C. LV GND U2 TEST POINTS TP-1 TP-2 TP-3 TP-4 TP-5 TP-6 TP-7 TP-8 VREF ICL7660 VOUT CAP+ CAP4 SSTRB CS SCLK Figure 1. MAX1202 EV Kit Schematic 4 _______________________________________________________________________________________ DOUT +3V DIN MAX1202 Evaluation Kit Evaluates: MAX1202/MAX1203 1.0" Figure 2. MAX1202 EV Kit Component Placement Guide-- Top Silkscreen 1.0" 1.0" Figure 3. MAX1202 EV Kit PC Board Layout--Component Side Figure 4. MAX1202 EV Kit PC Board Layout--Solder Side _______________________________________________________________________________________ 5 MAX1202 Evaluation Kit Evaluates: MAX1202/MAX1203 Listing 1. MAX1202 Pseudo-Code Example 6 _______________________________________________________________________________________ MAX1202 Evaluation Kit Evaluates: MAX1202/MAX1203 Listing 2. Bit-Banging Substitute for SPI Port _______________________________________________________________________________________ 7 |
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