MAX1280EVC16

19-1625; Rev 1; 5/07 MAX1280 Evaluation Kit/Evaluation System Features The MAX1280 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1280 evaluation kit (EV kit), Maxim 68HC16MODULE-DIP microcontroller (µC) module, and USBT0232. The MAX1280 is a high-speed, multichannel, 12-bit data-acquisition system. Windows ® 98/2000/XP-compatible software provides a handy user interface to exercise the MAX1280’s features. ♦ Proven PCB Layout Order the complete EV system (MAX1280EVC16) for a comprehensive evaluation of the MAX1280 using a PC. Order the EV kit (MAX1280EVKIT) if the 68HC16MODULE-DIP module has already been purchased with a previous Maxim EV system, or for custom use in other µC-based systems. ♦ EV Kit Software Supports Windows 2000/XP with USB Port Windows is a registered trademark of Microsoft Corp. Component Lists MAX1280 EV System PART QTY DESCRIPTION MAX1280EVKIT 1 MAX1280 EV kit 68HC16MODULE-DIP 1 68HC16 µC module USBTO232+ 1 USB-to-COM port adapter board +Denotes lead-free and RoHS-compliant. MAX1280 EV Kit DESIGNATION QTY C1–C8, C10 9 0.01µF ceramic capacitors DESCRIPTION C9 1 4.7µF, 10V tantalum capacitor C11, C13 2 0.1µF ceramic capacitors C12, C14 2 10µF, 10V tantalum capacitors J1 1 2 x 20 right-angle socket JU1 1 2-pin header JU2 1 3-pin header R1–R8 8 300Ω ±5% resistors R9, R10 2 10Ω ±1% resistors TP1 1 8-pin header U1 1 MAX1280BCUP (20-pin TSOP) — 1 PCB: MAX1280 Evaluation Kit MAX1280 EV Kit Files FILE DESCRIPTION INSTALL.EXE Installs the EV kit files on user’s computer MAX1280.EXE Application program KIT1280.C16 Software loaded into 68HC16 µC module ♦ 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 Ordering Information PART TEMP RANGE INTERFACE TYPE MAX1280EVKIT 0°C to +70°C User supplied MAX1280EVC16 0°C to +70°C Windows software Note: The MAX1280 software is designed for use with the complete MAX1280EVC16 EV system (includes 68HC16MODULEDIP module, USBTO232, and MAX1280EVKIT). If the MAX1280 evaluation software will not be used, the MAX1280EVKIT board can be purchased by itself, without the µC. Quick Start Recommended Equipment (USB Port/PC Connection Option) Before beginning, the following equipment is needed: • MAX1280 EV system: MAX1280 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 MAX1280 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. ________________________________________________________________ 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: MAX1280 General Description Evaluate: MAX1280 MAX1280 Evaluation Kit/Evaluation System 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. 2) Carefully connect the boards by aligning the 40-pin header of the MAX1280 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) Ensure that jumper JU1 is closed 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 68HC16MODULEDIP module if you have not done so already. 6) The MAX1280 EV kit software should have already been downloaded and installed in the USBTO232 Quick Start. 7) Start the MAX1280 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 KIT1280.C16 file to the module. 9) Apply an input signal between analog common (COM) and input channel CH0. Observe the readout on the screen. Recommended Equipment (RS-232-to-COM Port/PC Connection Option) Before beginning, the following equipment is needed: • MAX1280 EV system: MAX1280 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 (COM) port, preferably a 9-pin plug • A serial cable to connect the computer’s serial port to the 68HC16MODULE-DIP Connections and Setup The MAX1280 EV kit is fully assembled and tested. Follow the steps below to verify board operation. 2 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 MAX1280 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 MAX1280 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. 4) Ensure that jumper JU1 is closed 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 MAX1280 program by opening its icon in the Windows Start | Programs menu. 8) Turn the power on and slide SW1 to the ON position. The program will automatically download KIT1280.C16 to the module. 9) Apply an input signal between analog common (COM) and input channel CH0. Observe the readout on the screen. Detailed Description MAX1280 Stand-Alone EV Kit The MAX1280 EV kit provides a proven printed-circuit board (PCB) layout to evaluate the MAX1280. It must be interfaced to appropriate timing signals for proper operation. Connect +5V to VDD1 and VDD2, and connect the ground return to GND. See the MAX1280 EV kit schematic (Figure 1). Refer to the MAX1280 IC data sheet for timing requirements. _______________________________________________________________________________________ MAX1280 Evaluation Kit/Evaluation System Scanning All Channels To scan through all channels, select SCAN from the INPUT menu. Description of Software The evaluation software’s main window controls the active control word bits, serial clock speed, and sample rate. It displays the voltage and output code for each active channel, 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. Controls The control word is divided into several fields. To change the active control word, drop down the appropriate field’s combo box and select the desired option. If the QSPI™ clock is set to STOP, then configuration data will not be sent until the READ button is clicked. 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. Sampling Choose the desired sampling rate (QSPI Clock), sampling size (Sample! menu item), click 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 is graphed. Once displayed, the data can optionally be saved to a file. Evaluating Shutdown The evaluation software configures the 68HC16’s QSPI submodule to continuously read data from the MAX1280 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. Next, choose the desired software power-down control word, and click the Read button to send the new configuration to the MAX1280. Or, if evaluating the hardware shutdown, move jumper JU2 to the 2-3 position. Sense the supply current by measuring the voltage across resistors R9 and R10. Reference Voltage The evaluation software assumes a 2.5V reference voltage, unless otherwise specified. Refer to the MAX1280 IC data sheet for more information. To override this value, type the new reference voltage into the Vref edit box and click the Set Vref button. Description of Hardware U1, the MAX1280, is a high-speed, multichannel, 12-bit data-acquisition system. Resistors R1–R8 and capacitors C1–C8 form single-pole, lowpass anti-aliasing filters with a nominal 3ms time constant and approximately a 50kHz corner frequency. Jumper JU1 connects the analog common (COM) to ground (GND). C10 bypasses the bandgap reference, and C9 bypasses the analog-to-digital converter’s (ADC’s) voltage reference. When plugged into the 68HC16MODULE, VDD1 and VDD2 are both powered by +5V. See the MAX1280 EV kit schematic (Figure 1) and refer to the MAX1280 IC data sheet. Table 1. Jumper Functions JUMPER Closed* 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. POSITION JU1 JU2 QSPI is a trademark of Motorola, Inc. Open FUNCTION COM is connected to GND COM is disconnected from GND. All analog inputs, including COM, must still be within the MAX1280’s common-mode input range. 1-2* Operate 2-3 Shutdown *Default position. _______________________________________________________________________________________ 3 Evaluate: MAX1280 MAX1280 EV System The MAX1280 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 Recommended Equipment and Connections and Setup sections for setup and operating instructions. Evaluate: MAX1280 MAX1280 Evaluation Kit/Evaluation System Measuring Supply Current Power-supply current can be monitored by measuring the voltage across resistor R9 (for VDD1) or R10 (VDD2). These resistors are 10Ω ±1%, so every 0.001V across R9 represents 100µA of supply current. Troubleshooting Problem: No output measurement. System seems to report zero voltage or fails to make a measurement. 1) Check VDD1 and VDD2 supply voltages. 2) Check the 2.5V reference voltage using a DVM. 3) Verify with an oscilloscope that the conversion-start signal is being strobed. 4) 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. When probing for noise, keep the oscilloscope ground return lead as short as possible, preferably less than 1/2in (10mm). VDD1 J1-7 1 CHO R1 300Ω C1 0.01µF R2 300Ω C2 0.01µF 2 CH1 3 CH2 CHO CH1 SCLK C13 0.1µF C14 10µF 10V R10 10Ω 1% VDD2 TP1-6 R5 300Ω C5 0.01µF R6 300Ω C6 0.01µF CS 17 CH4 DIN 16 CH5 SSTRB 15 TP1-3 CH6 DOUT 14 TP1-2 J1-35 8 CH7 J1-2 J1-3 J1-29 C7 0.01µF R7 300Ω J1-1 TP1-4 J1-4 7 CH6 CH7 GND 13 C8 0.01µF R8 300Ω 9 O COM REFADJ 12 REFADJ C10 0.01µF 1 2 10 SHDN 3 2 1 VDD1 SHDN REF 11 REF C9 4.7µF 10V JU2 Figure 1. MAX1280 EV Kit Schematic 4 J1-8 GND TP1-5 J1-36 6 CH5 TP1-7 TP1-1 J1-38 CH4 VDD1 J1-31 5 JU1 R9 10Ω 1% 18 C4 0.01µF R4 300Ω C12 10µF 10V J1-37 MAX1280 CH3 C11 0.1µF 19 U1 4 CH3 VDD2 CH2 C3 0.01µF R3 300Ω VDD1 20 _______________________________________________________________________________________ MAX1280 Evaluation Kit/Evaluation System Evaluate: MAX1280 ,QLW /'$$ &6KLJKFORFNORZE\GHIDXOW 67$$43'5 /'$$) 67$$43$5 SLQVWKDWDUHDVVLJQHGWRWKH463, /'$$( 67$$4''5 460SLQVWKDWDUHRXWSXWV /'$$ &5&217 67$$&5 VHQGHLJKWELWFRQWUROZRUGDQGFRQWLQXH 67$$&5 67$$&5  67$$&5( /'$$ &5%,76( 67$$&5 UHFHLYHVL[WHHQELWGDWDILHOG 67$$&5 67$$&5  67$$&5) &/5' VHQG]HURZKHQUHFHLYLQJGDWD 67'75 67'75 67'75  67'75) /'$% FKDQQHOXQLSRODUVLQJOHHQGHGSG  VWG75 FKDQQHOFRPPDQG OGDE FKDQQHOELWPDVN RUG75 VWG75 FKDQQHOFRPPDQG OGDE FKDQQHOELWPDVN RUG75 VWG75 FKDQQHOFRPPDQG  OGDE FKDQQHOELWPDVN RUG75 VWG75( FKDQQHOFRPPDQG &/563&5 GLVDEOH463,KDOWPRGHLQWHUUXSW /'' %,76 63%5 0+]&32/ &3+$  67'63&5 /'' '6&.'7/QRWXVHG 67'63&5 /'') QHZTS HQGTS ZUDSWR]HUR 67'63&5 UXQ463,FRQWLQXRXVO\RQDOOFKDQQHOV %6(7:63&5 VWDUWWKH463, %&/56365 FOHDU63,)ELW 5HDG/RRS /''55 MVU3URFHVVB&KDQQHOB /''55 MVU3URFHVVB&KDQQHOB /''55 MVU3URFHVVB&KDQQHOB  /''55) MVU3URFHVVB&KDQQHOB MPS5HDG/RRS Example 1. Reading All Channels with QSPI _______________________________________________________________________________________ 5 Evaluate: MAX1280 MAX1280 Evaluation Kit/Evaluation System ,QLW /'$$ &6KLJKFORFNORZE\GHIDXOW 67$$43'5 /'$$) 67$$43$5 SLQVWKDWDUHDVVLJQHGWRWKH463, /'$$( 67$$4''5 460SLQVWKDWDUHRXWSXWV /'$$ &5&217 67$$&5 VHQGHLJKWELWFRQWUROZRUGDQGFRQWLQXH /'$$ &5%,76( 67$$&5 UHFHLYHVL[WHHQELWGDWDILHOG &/5' VHQG]HURZKHQUHFHLYLQJGDWD 67'75 /'$% FKDQQHOXQLSRODUVLQJOHHQGHGSG  VWG75 FKDQQHOFRPPDQG &/563&5 GLVDEOH463,KDOWPRGHLQWHUUXSW /'' %,76 63%5 0+]&32/ &3+$  67'63&5 /'' '6&.'7/QRWXVHG 67'63&5 /'' QHZTS HQGTS QRZUDS 67'63&5 5HDG/RRS %6(7:63&5 VWDUWWKH463, %&/56365 FOHDU63,)ELW ,GOH %5&/56365,GOH ZDLWXWLO63,)ELWLVVHW /''55 52/' 52/' 52/' MVU3URFHVVB&KDQQHOB MPS5HDG/RRS Example 2. Reading a Single Channel with QSPI 6 _______________________________________________________________________________________ MAX1280 Evaluation Kit/Evaluation System 1.0" Figure 2. MAX1280 EV Kit Component Placement Guide— Component Side Figure 3. MAX1280 EV Kit PCB Layout—Component Side 1.0" Figure 4. MAX1280 EV Kit PCB Layout—Solder Side Revision History Pages changed at Rev 1: Title change—all pages,1–4, 7, 8 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 _____________________ 7 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Evaluate: MAX1280 1.0"