MAX1132EVC16

19-2161; Rev 1; 12/06 MAX1132 Evaluation Kit/Evaluation System The MAX1132 evaluation system (EV system) is a complete, single-channel data-acquisition system, consisting of the MAX1132 evaluation kit (EV kit), Maxim 68HC16MODULE-DIP microcontroller (µC) module, and USBTO232. The MAX1132 is a high-speed, single-channel, 16-bit data acquisition system. Windows ® 98/2000/XP-compatible software provides a handy user interface to exercise the MAX1132’s features. Order the complete EV System (MAX1132EVC16) for comprehensive evaluation of the MAX1132 using a PC. Order the EV kit (MAX1132EVKIT) 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 ♦ Proven PCB Layout ♦ Complete Evaluation System ♦ Convenient Test Points Provided On-Board ♦ Data-Logging Software ♦ Fully Assembled and Tested ♦ EV Kit Software Supports Windows® 98/2000/XP with RS-232/COM Port ♦ EV Kit Software Supports Windows 2000/XP with USB Port Ordering Information MAX1132EVKIT Parts List REFERENCE QTY DESCRIPTION C1, C2 2 10µF 10V B-size tantalum capacitors C3 1 2.2µF 10V X7R ceramic capacitor 0.22µF X7R ceramic capacitor (1206) C4 1 C5, C6, C8 3 0.1µF X7R ceramic capacitors (1206) C7 1 1µF X7R ceramic capacitor (1206) FB1, FB2 2 Ferrite beads J1 1 2 x 20 right-angle socket SamTec SSW-120-02-S-D-RA JU1, JU5 2 3-pin headers JU2, JU3, JU4 2 2-pin headers R1 1 100kΩ ±1% 1206 resistor TB1, TB2 2 0.200in screw terminal blocks TP1 1 9-pin header U1 1 MAX1132BCAP U2 1 74HC04 (14-pin SO) hex inverter — 1 PCB: MAX1132EVKIT — 1 3.5in software disk, MAX1132 EV kit — 1 MAX1132 EV kit data sheet (includes 68HC16MODULE-DIP manual) — 1 MAX1132 data sheet PART TEMP RANGE INTERFACE MAX1132EVKIT 0°C to +70°C User supplied MAX1132EVC16 0°C to +70°C Windows software Note: The MAX1132 EV kit software is included with the MAX1132 EV kit, but is designed for use with the complete EV system. The EV system includes the Maxim 68HC16MODULEDIP µC module, a USBTO232+ USB-to-COM port adapter board, and the EV kit. If the Windows software will not be used, the MAX1132 EV kit board can be purchased by itself, without the µC and adapter board. MAX1132EVC16 System Component List PART MAX1132EVKIT QTY 1 DESCRIPTION MAX1132 EV kit 68HC16MODULE-DIP 1 68HC16 µC module USBTO232+ 1 USB-to-COM port adapter board List of Files in MAX1132 EV Kit FILE INSTALL.EXE MAX1132.EXE KIT1132.C16 DESCRIPTION Installs the EV kit files on computer Application program Software loaded into 68HC16 µC Windows is a registered trademark of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluate: MAX1132/MAX1133 General Description Evaluate: MAX1132/MAX1133 MAX1132 Evaluation Kit/Evaluation System MAX1132 Stand-Alone EV Kit The MAX1132EVKIT provides a proven PCB layout to facilitate evaluation of the MAX1132. It must be interfaced to appropriate timing signals for proper operation. Connect +5V to AVDD and connect ground return to AGND (Figure 1). Refer to the MAX1132 data sheet for timing requirements. MAX1132 EV System The MAX1132EVC16 EV system operates from a usersupplied +7VDC to +20VDC power supply. Windows 98/2000/XP-compatible software running PC interfaces to the EV system board through the computer’s serial communications port (virtual COM port). See the Quick Start section for setup and operating instructions. Quick Start Recommended Equipment—USB Port PC Connection Option 6) The MAX1132 EV kit software should have already been downloaded and installed in the USBTO232 Quick Start. 7) Start the MAX1132 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 KIT1132.C16 file to the module. 9) Apply the input signal across the pins of JU2. Observe the readout on the screen. Recommended Equipment—RS-232/COM Port PC Connection Option Before you begin, the following equipment is needed: • MAX1132EVC16 (contains MAX1132EVKIT board and 68HC16MODULE-DIP) • Before you begin, the following equipment is needed: • MAX1132EVC16 (contains MAX1132 EV kit board, 68HC16MODULE-DIP, and USBTO232) Small DC power supply, such as a 12VDC, 0.25A plug-in transformer, or a +9V battery • PC-compatible computer running Windows 98/2000/XP with an available serial communications port, preferably a 9-pin plug • Small DC power supply, such as a 12VDC, 0.25A plug-in transformer, or a +9V battery • Serial cable to connect the computer’s serial port to the 68HC16MODULE-DIP • PC-compatible computer running Windows 2000/XP with an available USB port to connect to the USBTO232 board • USB cable included with the USBTO232 Procedure Caution: Do not turn on the power until all the 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. 2) Carefully connect the boards by aligning the 40-pin connector of the MAX1132 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) Check the jumper settings (Table 1). 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. 2 Procedure Caution: Do not turn on the power until all the 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 MAX1132 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 connector of the MAX1132 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) Check the jumper settings (Table 1). 5) Connect a +7VDC to +20VDC power source to the 68HC16MODULE-DIP module at the terminal block J2 located next to the ON/OFF switch. Observe the polarity marked on the board. 6) Connect a cable from the computer’s serial port to the 68HC16MODULE-DIP module. If using a 9-pin serial port, use a straight-through, 9-pin female-to- _______________________________________________________________________________________ MAX1132 Evaluation Kit/Evaluation System 7) Start the MAX1132 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 KIT1132.C16 file to the module. 9) Apply the input signal across the pins of JU2. Observe the readout on the screen. Detailed Description of Software The evaluation software main window controls the active control word bits, 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. 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, the configuration data is not sent until the READ button is clicked. Statistics The minimum and maximum fields show the lowest and highest readings acquired. The average and RMS fields show the running mean and root-mean-square of the input signal. The Clear button resets the statistics. To remove offset errors, first apply zero volts to the active input channel, clear statistics, acquire some samples, and then check Tare. This offset is now subtracted from all subsequent voltage measurements. Sampling To sample data at rates up to 125ksps, select the Sample menu item, make your selections, and click the Begin Sampling button. Sample size is restricted to a power of two 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 Table 1. Jumper Functions JUMPER POSITION — 1-2 FUNCTION JU1 Open — 2-3 JU2 Closed — Open JU3 Closed Illegal Enable internal reference, or apply an external reference Operate SHDN is controlled by 68HC16 module Shutdown Measure short circuit (zero volts) Apply input signal at JU2 — Open* JU4 Closed Disable internal reference — Open* Enable internal reference — 1 JU5 2 User-programmable output pin P2 User-programmable output pin P1 — 3 User-programmable output pin P0 *Default configuration. _______________________________________________________________________________________ 3 Evaluate: MAX1132/MAX1133 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. Evaluate: MAX1132/MAX1133 MAX1132 Evaluation Kit/Evaluation System graphed. Once displayed, the data can optionally be saved to a file. ues into the appropriate edit box and click the Set VREF button. 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 MAX1132 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 checkbox. Next, choose the desired software power-down control word, and click the Read button to send the new configuration to the MAX1132. If evaluating the hardware shutdown, move JU2 to the 2-3 position. Detailed Description of Hardware The MAX1132 (U1) is a high-speed, single-channel, 16bit data-acquisition system. There is no antialiasing filter provided. The input signal may be applied directly to JU2. High-impedance signal sources may require an input buffer, which may be installed in the prototype area. C4 bypasses the bandgap reference, and C3 bypasses the A/D converter‘s voltage reference. When plugged into the 68HC16MODULE, the AVDD and DVDD circuits are both powered by +5V. (Figure 1). Refer to the MAX1132 data sheet. Evaluating the MAX1133 To change the evaluation software's full-scale voltage for use with the MAX1133, type 4.096 into the full-scale edit box and click the Set VREF button. Reference Voltage Troubleshooting The evaluation software assumes a +4.096V reference voltage and a +12V full-scale voltage, unless otherwise specified. Refer to the MAX1132 data sheet for more information. To override these values, type the new val- Problem: No output measurement. System seems to report zero voltage, or fails to make a measurement. Check VDD and VLOGIC supply voltages. Check the +4.096V reference voltage using a digital voltmeter. 4 _______________________________________________________________________________________ MAX1132 Evaluation Kit/Evaluation System Evaluate: MAX1132/MAX1133 U2-C 5 DVDD 74HC04 U2-D AVDD FB2 JU3 1 J1-7 C2 10µF 10V J1-8 JU4 AGND REFADJ C4 0.22µF TB1 FB1 CREF AGND CS TP1-2 J1-4 1 2 J1-29 TP1-2 DVDD JU1 11 74HC04 U2-F 10 13 74HC04 U2-G 12 74HC04 17 J1-38 DVDD TP1-5 MAX1132 4 J1-3 8 18 TP1-4 C5 0.1µF J1-2 19 C7 1.0µF 3 J1-1 9 20 JU2 2 AVDD C1 10µF 10V AIN REF C3 2.2µF 10V AVDD TP1-1 6 AVDD 5 DGND DIN DVDD 6 3 DGND SHDN 16 C8 0.1µF J1-36 DVDD 15 C6 0.1µF 14 TP1-6 DVDD JU5 1 2 3 TB2 7 8 9 TP1-3 J1-27 10 SCLK P2 13 J1-37 DVDD P1 R1 TP1-7 100kΩ P0 RST 12 J1-31 SSTRB U2-A NOTES: 1. MINIMIZE PARASITIC CAPACITANCE OF U1 PIN 11–U2 PIN 1. KEEP THE TRACE SHORT AND KEEP GROUND PLANE 0.025in AWAY. 2. U2 SUPPLY AND GROUND RETURN SHOULD BE ROUTED TO CONNECTOR J1, NOT FLOODED. DOUT 11 1 U2-B 2 74HC04 3 TP1-8 4 J1-35 74HC04 Figure 1. MAX1132 EV Kit Schematic Diagram Use an oscilloscope to verify that the conversion-start signal is being strobed. Verify that SHDN is being driven high. Problem: Unacceptable errors when measuring a transducer. Although most signal sources can be connected directly to the MAX1132’s analog input, some high-impedance signal sources may require an input buffer. Check for settling errors by increasing the acquisition time: operate the evaluation kit in external clock mode, 32 clocks per conversion, with the QSPI clock at its slowest setting. Problem: Measurements are erratic, unstable; poor accuracy. Check the reference voltage and input using a digital voltmeter. Use an oscilloscope to check for noise. When probing for noise, keep the oscilloscope ground _______________________________________________________________________________________ 5 Evaluate: MAX1132/MAX1133 MAX1132 Evaluation Kit/Evaluation System ,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 Listing 1. Reading All Channels with QSPI 6 _______________________________________________________________________________________ MAX1132 Evaluation Kit/Evaluation System Evaluate: MAX1132/MAX1133 ,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 Listing 2. Reading a Single Channel with QSPI _______________________________________________________________________________________ 7 Evaluate: MAX1132/MAX1133 MAX1132 Evaluation Kit/Evaluation System 1.0" 1.0" Figure 2. MAX1132 EV Kit Component Placement Guide — Component Side Figure 3. MAX1132 EV Kit PCB Layout—Component Side 1.0" Figure 4. MAX1132 EV Kit PCB Layout—Solder Side Revision History Pages changed at Rev 1: 1, 2, 3, 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.