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19-2161; Rev 0; 09/01
MAX1132 Evaluation Kit
General Description
The MAX1132 evaluation system (EV system) is a complete, single-channel data-acquisition system, consisting of a MAX1132 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (C) module. The MAX1132 is a high-speed, single-channel, 16-bit data acquisition system. Windows(R) 95/98 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 Cbased systems. The MAX1132 software is designed for use with the complete EV system MAX1132EVC16 (includes 68HC16MODULE-DIP module together with MAX1132 EVKIT). If the MAX1132 evaluation software is not used, the MAX1132EVKIT board can be purchased by itself, without the C. o Proven PC Board Layout o Complete Evaluation System o Convenient Test Points Provided On-Board o Data-Logging Software o Fully Assembled and Tested
Features
Evaluates: MAX1132/MAX1133
Ordering Information
PART MAX1132EVKIT MAX1132EVC16 TEMP. RANGE 0C to +70C 0C to +70C INTERFACE TYPE User supplied Windows software
MAX1132EVKIT Parts List
REFERENCE QTY C1, C2 C3 C4 C5, C6, C8 C7 FB1, FB2 J1 JU1, JU5 JU2, JU3, JU4 R1 TB1, TB2 TP1 U1 U2 None None None None 2 1 1 3 1 2 1 2 2 1 2 1 1 1 1 1 1 1 DESCRIPTION 10F 10V B-size tantalum capacitors 2.2F 10V X7R ceramic capacitor 0.22F X7R ceramic capacitor (1206) 0.1F X7R ceramic capacitors (1206) 1F X7R ceramic capacitor (1206) Ferrite beads 2 x 20 right-angle socket, SamTec SSW-120-02-S-D-RA 3-pin headers 2-pin headers 100k 1% 1206 resistor 0.200in screw terminal blocks 9-pin header MAX1132BCAP 74HC04 (14-pin SO) hex inverter PC board, MAX1132 EV kit 3.5in software disk, MAX1132 EV kit MAX1132 EV kit data sheet (includes 68HC16MODULE-DIP manual) MAX1132 data sheet FILE INSTALL.EXE MAX1132.EXE KIT1132.C16 PART MAX1132EVKIT 68HC16MODULE-DIP
MAX1132EVC16 System Component List
QTY 1 1 DESCRIPTION MAX1132 EV kit 68HC16 C module
List of Files in MAX1132 EV Kit
DESCRIPTION Installs the EV kit files on computer Application program Software loaded into 68HC16 C
Windows is a registered trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
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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.
MAX1132 Evaluation Kit Evaluates: MAX1132/MAX1133
MAX1132 Stand-Alone EV Kit
The MAX1132EVKIT provides a proven PC board 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. 5) Install the MAX1132 EV kit software on your computer by running the INSTALL.EXE program on the floppy disk. The program files are copied and icons are created for them in the Windows Start menu. 6) Start the MAX1132 program by opening its icon in the Start menu. 7) The program prompts you to connect the C module and turn its power on. Slide SW1 to the ON position. Select the correct serial port and click OK. The program automatically downloads KIT1132.C16 to the module. 8) Apply the input signal across the pins of JU2. Observe the readout on the screen.
MAX1132 EV System
The MAX1132EVC16 EV system operates from a usersupplied +7VDC to +20VDC power supply. Windows 95/98 software running on an IBM PC interfaces to the EV system board through the computer's serial communications port. See the Quick Start section for setup and operating instructions.
Quick Start
Recommended Equipment
Before you begin, the following equipment is needed: * MAX1132EVC16 (contains MAX1132EVKIT board and 68HC16MODULE-DIP) * * * * Small DC power supply, such as a 12VDC 0.25A plug-in transformer, or a +9V battery IBM PC-compatible computer running Windows 95/98 Spare serial communications port, preferably a 9-pin plug Serial cable to connect the computer's serial port to the 68HC16MODULE-DIP
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.
1) Carefully connect the boards by aligning the 40-pin header 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. 2) Check the jumper settings (Table 1). 3) Connect a +7VDC to +20VDC power source to the C module at the terminal block located next to the on/off switch, along the top edge of the C module. Observe the polarity marked on the board. 4) 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.
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 graphed. Once displayed, the data can optionally be saved to a file.
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MAX1132 Evaluation Kit
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.
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.
Evaluates: MAX1132/MAX1133
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.
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.
Troubleshooting
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. Use an oscilloscope to verify that the conversion-start signal is being strobed. Verify that SHDN is being driven high.
Reference Voltage
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 values into the appropriate edit box and click the Set VREF button.
Table 1. Jumper Functions
JUMPER -- JU1 -- JU2 -- JU3 -- JU4 -- -- JU5 -- POSITION 1-2 Open 2-3 Closed Open Closed Open* Closed Open* 1 2 3 Operate SHDN is controlled by 68HC16 module Shutdown Measure short circuit (zero volts) Apply input signal at JU2 Illegal Enable internal reference, or apply an external reference Disable internal reference Enable internal reference User-programmable output pin P2 User-programmable output pin P1 User-programmable output pin P0 FUNCTION
*Default configuration
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MAX1132 Evaluation Kit Evaluates: MAX1132/MAX1133
U2-C 5 74HC04 U2-D JU3 C2 10F 10V AVDD TP1-1 C1 10F 10V J1-1 J1-2 J1-3 J1-4 TP1-2 DVDD TB2 JU5 1 2 3 TP1-3 10 7 8 9 P2 P1 P0 RST SSTRB DOUT 11 1 12 R1 TP1-7 100k J1-31 U2-A 2 74HC04 3 U2-B 4 74HC04 TP1-8 J1-35 SCLK J1-29 TP1-2 DVDD 1 2 3 JU1 C5 0.1F 4 MAX1132 DIN DVDD 6 SHDN DGND AVDD 5 DGND AVDD TB1 FB1 JU4 C4 0.22F 3 C3 2.2F 10V 2 AGND REFADJ CREF 9 1 REF AIN 20 JU2 19 18 C7 1.0F TP1-4 AGND CS 17 TP1-5 16 15 14 DVDD C6 0.1F TP1-6 13 J1-37 DVDD J1-36 C8 0.1F J1-38 DVDD 13 11 74HC04 U2-F 10 74HC04 U2-G 12 74HC04 8 6
DVDD FB2 J1-7 J1-8
AVDD
J1-27
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.
Figure 1. MAX1132 EV Kit Schematic Diagram
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 return lead as short as possible, preferably less than 1/2in (10mm).
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MAX1132 Evaluation Kit Evaluates: MAX1132/MAX1133
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Listing 1. Reading All Channels with QSPI _______________________________________________________________________________________ 5
MAX1132 Evaluation Kit Evaluates: MAX1132/MAX1133
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Listing 2. Reading a Single Channel with QSPI
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MAX1132 Evaluation Kit Evaluates: MAX1132/MAX1133 Evaluates: MAX1132
1.0"
1.0"
Figure 2. MAX1132 EV Kit Component Placement Guide -- Component Side
Figure 3. MAX1132 EV Kit PC Board Layout--Component Side
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Figure 4. MAX1132 EV Kit PC Board Layout--Solder Side
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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