MAX1284EVC16

19-1738; Rev 1; 5/07 MAX1284 Evaluation Kit/Evaluation System The MAX1284 evaluation system (EV system) is a complete data-acquisition system consisting of a MAX1284 evaluation kit (EV kit), Maxim 68HC16MODULE-DIP microcontroller (µC) module, and USBT0232. The MAX1284 is a high-speed, 12-bit data acquisition system. Windows® 98/2000/XP-compatible software provides a handy user interface to exercise the MAX1284’s features. Order the complete EV system (MAX1284EVC16) for comprehensive evaluation of the MAX1284 using a PC. You can order the EV kit (MAX1284EVKIT) if the 68HC16MODULE-DIP module has already been purchased with a previous Maxim EV system, or for custom use in other µC-based systems. Features o o o o o Proven PCB Layout Convenient On-Board Test Points Data-Logging Software Fully Assembled and Tested EV Kit Software Supports Windows 98/2000/XP with RS-232/COM Port o EV Kit Software Supports Windows 2000/XP with USB Port Ordering Information PART Windows is a registered trademark of Microsoft Corp. Component Lists MAX1284 EV System PART QTY 1 MAX1284 EV kit 68HC16MODULE-DIP 1 68HC16 µC module USB-to-COM port adapter board +Denotes lead-free and RoHS-compliant. USBT0232+ 1 MAX1284 EV Kit DESIGNATION QTY C1 1 0.01µF ceramic capacitor DESCRIPTION C2, C3 2 0.1µF ceramic capacitors C4 1 4.7µF tantalum capacitor C5 1 10µF, 10V tantalum capacitor J1 1 2x20 right-angle socket JU1 1 2-pin header JU2 1 3-pin header R1 1 1kΩ ±5% resistor TP1 1 6-pin header U1 1 MAX1284BCSA (8-pin SO) — 1 PCB: MAX1284 Evaluation Kit MAX1284 EV Kit Files FILE DESCRIPTION INSTALL.EXE Installs the EV kit files on your computer MAX1284.EXE Application program KIT1284.C16 Software loaded into 68HC16 µC INTERFACE TYPE MAX1284EVKIT 0°C to +70°C User supplied MAX1284EVC16 0°C to +70°C Windows software Note: The MAX1284 software is designed for use with the complete MAX1284EVC16 EV system (includes 68HC16MODULE-DIP module, USBT0232, together with MAX1284EVKIT). If the MAX1284 evaluation software will not be used, the MAX1284EVKIT board can be purchased by itself, without the µC. DESCRIPTION MAX1284EVKIT TEMP. RANGE Quick Start Recommended Equipment (USB Port/PC Connection Option) Before beginning, the following equipment is needed: • MAX1284 EV system: MAX1284 EV kit 68HC16MODULE-DIP USBTO232 (USB cable included) • A small DC power supply, such as a 12VDC, 0.25A plug-in transformer or a 9V battery • A user-supplied Windows 2000/XP computer with an available USB port to connect to the USBTO232 board Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows 2000/XP operating system. Connections and Setup The MAX1284 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power until all connections are completed. 1) Visit the Maxim website (www.maxim-ic.com) to download the latest version of the USBTO232 User Guide. Follow the steps in the USBTO232 User Guide Quick Start section and return to step 2 of this Quick Start section when finished. ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Evaluate: MAX1284 General Description Evaluate: MAX1284 MAX1284 Evaluation Kit/Evaluation System 2) Carefully connect the boards by aligning the 40-pin header of the MAX1284 EV kit with the 40-pin connector of the 68HC16MODULE-DIP module, both boards component side up. Gently press them together. The two boards should be flush against one another. 3) Ensure that jumper JU1 is open and jumper JU2 is in the 1-2 position. 4) Connect a +7VDC to +20VDC power source to the µC module at the terminal block located next to the on/off switch, along the top-edge of the µC module. Observe the polarity marked on the board. 5) Connect the USBTO232 board to the 68HC16MODULE-DIP module if you have not done so already. 6) The MAX1284 EV kit software should have already been downloaded and installed in the USBTO232 Quick Start. 7) Start the MAX1284 program by opening its icon in the Start | Programs menu. 8) Turn on the power supply and slide SW1 to the ON position on the 68HC16MODULE-DIP module. Press the OK button to automatically connect and download the file KIT1284.C16 to the module. 9) Apply an input signal between AIN and GND. Observe the readout on the screen. Recommended Equipment (RS-232-to-COM Port/PC Connection Option) Before beginning, the following equipment is needed: • MAX1284 EV system: MAX1284 EV kit 68HC16MODULE-DIP • • • A small DC power supply, such as a 12VDC, 0.25A plug-in transformer or a 9V battery A user-supplied Windows 98/2000/XP computer with an available serial communications port, preferably a 9-pin plug A serial cable to connect the computer’s serial port to the 68HC16MODULE-DIP Connections and Setup The MAX1284 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power until all connections are completed. 1) Visit the Maxim website (www.maxim-ic.com/evkitsoftware) to download the latest version of the EV kit software. Save the EV kit software to a temporary folder and uncompress the file (if it is a .zip file). 2) Install the MAX1284 EV kit software on your computer by running the INSTALL.EXE program. The program files are copied and icons are created for them in the Windows Start | Programs menu. 3) Carefully connect the boards by aligning the 40-pin header of the MAX1284 EV kit with the 40-pin connector of the 68HC16MODULE-DIP module, both boards component side up. Gently press them together. The two boards should be flush against one another. 4) Ensure that jumper JU1 is open and jumper JU2 is in the 1-2 position. 5) Connect a +7VDC to +20VDC power source to the µC module at the terminal block located next to the on/off switch, along the top-edge of the µC module. Observe the polarity marked on the board. 6) 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 will be required. The EV kit software checks the modem status lines (CTS, DSR, and DCD) to confirm that the correct port has been selected. 7) Start the MAX1284 program by opening its icon in the Start | Programs menu. 8) Turn on the power supply and slide SW1 to the ON position. Select the correct serial port and press OK. The program will automatically download KIT1284.C16 to the module. 9) Apply an input signal between AIN and GND. Observe the readout on the screen. Table 1. Jumper JU1 Functions JUMPER JU1 POSITION Closed SHDN driven by µC; JU2 must be open 1-2* SHDN set by JU2 Operate 2-3 Shutdown Open* JU2 FUNCTION *Default position. 2 _______________________________________________________________________________________ MAX1284 Evaluation Kit/Evaluation System Evaluate: MAX1284 GND J1-1 GND J1-2 J1-3 3 JU2 J1-4 J1-7 C5 10µF 1 2 VDD VDD J1-8 J1-28 J1-30 C2 0.1µF SCLK JU1 UPSHDN SHDN 3 6 J1-33 J1-34 J1-35 CS 8 DOUT 7 DOUT J1-37 SCLK J1-38 CS SHDN VDD DOUT U1 AIN SCLK MAX1284 REF CS GND 1 R1 1k 2 4 GND TP1-2 VDD TP1-3 SCLK TP1-4 CS TP1-5 DOUT TP1-6 SHDN J1-25 J1-26 J1-27 J1-29 J1-31 J1-32 J1-36 J1-19 J1-20 J1-21 J1-22 J1-23 J1-24 AIN C4 4.7µF VREF (2.5V NOMINAL) 5 C3 0.1µF TP1-1 C1 0.01µF J1-40 J1-13 J1-14 J1-15 J1-16 J1-17 J1-18 J1-39 J1-5 J1-6 J1-9 J1-10 J1-11 J1-12 Figure 1. MAX1284 EV Kit Schematic Diagram Detailed Description Description of Software MAX1284 Stand-Alone EV Kit The evaluation software’s main window controls the serial-clock speed and sample rate. It displays the voltage and output code as well as some statistics of the input signal. A separate graph window shows the data changing in real time. The update rate is limited to about 10 samples per second, due to COM port bandwidth limitations. The MAX1284 EV kit provides a proven PCB layout to evaluate the MAX1284. It must be interfaced to appropriate timing signals for proper operation. Connect +5V to VDD, and connect the ground return to GND (Figure 1). Refer to the MAX1284 data sheet for timing requirements. MAX1284 EV System The MAX1284 EV system operates from a user-supplied +7VDC to +20VDC power supply. Windows 98/2000/XP-compatible software running on a PC interfaces to the EV system board through the computer’s serial communications port. See the Quick Start section for setup and operating instructions. Statistics The Minimum and Maximum fields show the highest and lowest readings acquired. The Average field shows a running mean based on the equation ai = (k)(xi) + (1 - k)(ai - 1). The Clear button resets the statistics. To remove offset errors, first apply 0V to the active input channel, clear statistics, acquire some samples, and then check Tare. This average offset voltage will now be subtracted from all subsequent measurements. _______________________________________________________________________________________ 3 Evaluate: MAX1284 MAX1284 Evaluation Kit/Evaluation System Sampling Choose the desired sampling rate (QSPI™ Clock), sampling size (Sample! menu item), and press Begin Sampling! (in Sample! pop-up window). Sample size is restricted to a power of 2 to permit FFT processing once the data is saved to a file. After the samples have been collected, the data is automatically uploaded to the host and graphed. Once displayed, the data can be saved optionally to a file. Saving Graphs to Disk Data in the real-time graph and in sampled data graphs may be saved to a file. Only the raw output codes are saved, but voltages may be inferred, based on the reference voltage and the maximum code value. Evaluating Shutdown The evaluation software configures the 68HC16’s QSPI submodule to continuously read data from the MAX1284 into the 68HC16. The sample rate is controlled by the QSPI clock. To evaluate power-saving modes, these automatic updates must be stopped. First, set the QSPI clock control to STOP. This reconfigures the 68HC16’s QSPI submodule to stop driving the serial clock. Second, in the evaluation software’s main window, uncheck the Read Every...msec checkbox. If evaluating the hardware shutdown, move jumper JU2 to the 2-3 position. Reference Voltage The evaluation software assumes a 2.5V reference voltage, unless otherwise specified. Refer to the MAX1284 data sheet for more information. To override this value, type the new reference voltage into the Vref edit box and press the Set Vref button. Detailed Hardware Description The MAX1284 (U1) is a high-speed, 12-bit dataacquisition system. Resistor R1 (1kΩ) and capacitor C1 (0.01µF) form a single-pole, low-pass anti-aliasing filter with a nominal 10µs time constant and a corner frequency of approximately 16kHz. C3 and C4 bypass the analog-to-digital converter’s (ADC’s) voltage reference. When plugged into the 68HC16MODULE, the VDD circuit is powered by +5V (Figure 1; refer to the MAX1284 IC data sheet). Troubleshooting Problem: No output measurement. System seems to report zero voltage or fails to make a measurement. 1) Check the VDD supply voltage. 2) Check the reference voltage using a DVM. 3) Use an oscilloscope to verify that the conversionstart signal is being strobed. Verify that SHDN is being driven high. Problem: Measurements are erratic, unstable; poor accuracy. 1) Check the reference voltage using a DVM. 2) Use an oscilloscope to check for noise. 3) When probing for noise, keep the oscilloscope ground return lead as short as possible, preferably less than 1/2in (10mm). QSPI is a trademark of Motorola, Inc. 4 _______________________________________________________________________________________ MAX1284 Evaluation Kit/Evaluation System Evaluate: MAX1284 1.0" Figure 2. MAX1284 EV Kit Component Placement Guide— Component Side 1.0" Figure 3. MAX1284 EV Kit PCB Layout—Component Side _______________________________________________________________________________________ 5 Evaluate: MAX1284 MAX1284 Evaluation Kit/Evaluation System 1.0" Figure 4. MAX1284 EV Kit PCB Layout—Solder Side Revision History Pages changed at Rev 1: Title change—all pages, 1–6 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 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.