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19-2161 Rev 0 09 / 01

MAX1132 Evaluation Kit

19-2161 Rev 0 09 / 01
MAX1132 Evaluation Kit
General Description
Features
Evaluates: MAX1132 / MAX1133
Ordering Information
PART MAX1132EVKIT MAX1132EVC16 TEMP. RANGE 0°C to +70°C 0°C to +70°C INTERFACE TYPE User supplied Windows software
MAX1132EVKIT Parts List
MAX1132EVC16 System Component List
QTY 1 1 DESCRIPTION MAX1132 EV kit 68HC16 µC module
List of Files in MAX1132 EV Kit
DESCRIPTION Installs the EV kit files on computer Application program Software loaded into 68HC16 µC
Windows is a registered trademark of Microsoft Corp.
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 µC 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
Quick Start
Recommended Equipment
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
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.
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
Evaluates: MAX1132 / MAX1133
Evaluating Shutdown
Evaluating the MAX1133
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
MAX1132 Evaluation Kit Evaluates: MAX1132 / MAX1133
U2-C 5 74HC04 U2-D JU3 C2 10µF 10V AVDD TP1-1 C1 10µF 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 0.1µF 4 MAX1132 DIN DVDD 6 SHDN DGND AVDD 5 DGND AVDD TB1 FB1 JU4 C4 0.22µF 3 C3 2.2µF 10V 2 AGND REFADJ CREF 9 1 REF AIN 20 JU2 19 18 C7 1.0µF TP1-4 AGND CS 17 TP1-5 16 15 14 DVDD C6 0.1µF TP1-6 13 J1-37 DVDD J1-36 C8 0.1µF J1-38 DVDD 13 11 74HC04 U2-F 10 74HC04 U2-G 12 74HC04 8 6
DVDD FB2 J1-7 J1-8
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: 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).
MAX1132 Evaluation Kit Evaluates: MAX1132 / MAX1133
Listing 2. Reading a Single Channel with QSPI
MAX1132 Evaluation Kit Evaluates: MAX1132 / MAX1133 Evaluates: MAX1132
Figure 2. MAX1132 EV Kit Component Placement Guide - Component Side
Figure 3. MAX1132 EV Kit PC Board Layout-Component Side
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.