MAX115 Evaluation MAX115 evaluation system system) complete, eigh
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MAX115 Evaluation
MAX115 evaluation system system) complete, eight channel data-acquisition system consisting MAX115 evaluation kit) Maxim 68HC16MOD-16WIDE microcontroller (µC) module. MAX115 high speed, multichannel, 12-bit data acquisition system with simultaneous track/holds. Windows 3.1/Windows software provides handy user interface exercise MAX115's features. Order complete System (MAX115EVB16) comprehensive evaluation MAX115 using personal computer. Order (MAX115EVKIT) 68HC16MOD-16WIDE Module already been purchased with previous Maxim system custom other µC-based systems. Proven Board Layout Complete Evaluation System Samples 40ksps Convenient Test Points Provided On-Board Data-Logging Software with Capability Fully Assembled Tested
Features
Evaluates: MAX115/MAX116
MAX115EVKIT/MAX116EVKIT Parts List
DESIGNATION NONE NONE DESCRIPTION 0.1µF ceramic 1206 chip capacitors 10µF, tantalum capacitors 4.7µF, 6.3V tantalum capacitor 100pF ceramic 1206 chip right angle sockets 1206 chip resistors 1206 chip resistors 1206 chip resistors Maxim MAX115CAX MAX116CAX 78L05 voltage regulator 74HCT244 79L05 negative voltage regulator 16MHz clock oscillator module board Software disk, "MAX115 Evaluation Kit" PART MAX116EVKIT 68HC16 MOD16WIDE PART MAX115EVKIT MAX115EVB16 MAX116EVKIT MAX116EVB16
Ordering Information
TEMP. RANGE +70°C +70°C +70°C +70°C INTERFACE TYPE User-Supplied Windows Software User-Supplied Windows Software
MAX115EVB16 System Component List
PART MAX115EVKIT 68HC16 MOD16WIDE DESCRIPTION MAX115 Evaluation 68HC16 Module with 16-bit parallel interface
MAX116EVB16 System Component List
DESCRIPTION MAX116 Evaluation 68HC16 Module with 16-bit parallel interface
MAX115 File List
INSTALL.EXE MAX115.EXE MAX115.HLP KIT125.B16 MAX115.INI UNINST.EXE Installs files your computer Application program Help file Software loaded into 68HC16 Program settings Removes files from your computer
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX115 Evaluation Evaluates: MAX115/MAX116
MAX115 Stand-Alone
MAX115 provides proven board layout facilitate evaluation MAX115. must interfaced appropriate timing signals proper operation. Dual power supplies (±8VDC min, ±20VDC max) should applied P1-5, P1-9, with ground P1-1. Connect active-low read strobe P1-38, connect write strobe P1-37, connect memory mapped chip selects P1-35 P1-36. Refer Figure MAX115 Schematic board schematic. Refer MAX115 data sheet timing requirements. on/off switch along edge module. Observe polarity marked board. Connect cable from computer's serial port module. using 9-pin serial port, straight-through, 9-pin female-to-male cable. only available serial port uses 25-pin connector, standard 25-pin 9-pin adapter will required. software checks modem status lines (CTS, DSR, DCD) confirm that correct port been selected. Install MAX115 software your computer running INSTALL.EXE program floppy disk. program files copied icons created them Windows Program Manager Windows Start Menu). Start MAX115 program opening icon Program Manager Start Menu). program will prompt connect module turn power Slide "ON" position. Select correct serial port, click program will automatically download KIT125.B16 module. Apply input signals inputs labeled CH1ACH4A bottom edge MAX115 board. Observe readout screen.
MAX115 System
MAX115/MAX116 systems operate from usersupplied +13V +20V power supply. Windows 3.1/95 software running interfaces system board through computer's serial communications port. software operated with without mouse. Refer Quick Start section setup operating instructions. MAX115 software designed with complete evaluation system MAX115EVB16 MAX116EVB16 (includes 68HC16MOD-16WIDE module together with MAX115EVKIT MAX116EVKIT). MAX115 evaluation software will used, MAX115EVKIT board purchased itself without microcontroller. evaluate MAX116, order complete evaluation system MAX116EVB16 just interface board MAX116EVKIT.
Detailed Description Software
MAX115 digitizes four inputs from either input bank. Conversion time determined number enabled inputs. software collects samples maximum throughput 40ksps (one channel) 26ksps (four channels). various program functions grouped into dialog boxes, which accessible from Window menu main menu bar.
Quick Start
Before begin, will need: Maxim's MAX115EVB16 (contains MAX115EVKIT board 68HC16MOD-16WIDE) small power supply (+13V +20V 250mA) PC-compatible computer running Windows Windows spare serial communications port (9-pin plug) serial cable connect computer's serial port Maxim 68HC16MOD-16WIDE module
Keyboard Navigation
mouse other pointing device available, operate program using following keyboard shortcuts. Press ALT+W bring Window menu then select tool window. Press select controls within selected tool window. Buttons activated pressing space bar. Check boxes, radio buttons, combo boxes respond up/down arrow keys. Refer Table Keyboard Navigation Shortcuts.
Carefully connect boards aligning 40-pin headers MAX115 with 40-pin connectors 68HC16MOD-16WIDE module. Gently press them together. boards should flush against another. Connect +13V +20V power source module terminal block located next
MAX115 Evaluation
Table Keyboard Navigation Shortcuts
space minus Space Print Screen Window menu System menu main program window System menu child window Click selected button Copy image main window onto clipboard FUNCTION Select next control
Low-Speed Data Logging
Readings taken automatically from user-selected channels regular intervals samples second selecting "Scan Tool" from "Window"menu. Channel Selection Configuration group controls which channels shall scanned, (where applicable) configures each channel bipolar and/or differential input. Bipolar Differential controls disabled because MAX115 inputs always bipolar never differential. scan rate combo controls rate which measurements made. Readings displayed Recent Values text area. Readings optionally recorded into data file. Click "New Log" button begin data logging. This brings "Log File Format" dialog box. complete line data written after enabled channels have been sampled. first line file contains column headings. Each subsequent line file contains enabled channels, separated commas, tabs, spaces (previously selected File Format dialog box). Once file been opened, paused resumed with corresponding menu commands. program continues write data file until Stop button clicked.
"Window" menu, select "Power Cycling Tool". amount power savings depends primarily long part between conversions. accuracy conversions depends power-up delay, reference capacitor, time power-down. Adjust off-time with delay between samples command. Adjust on-time with power-up delay command. Using adequate power-up delay will ensure desired conversion accuracy during power cycling modes. reference must allowed enough time stabilize before measurement performed. Start with zero power-up delay increase delay time until further change accuracy observed. power-up delay requirement depends value reference capacitor off-time. MAX115 software performs power-up writing configuration word with shutdown set. After powering power-up delay executed allow time reference voltage stabilize that accurate measurement performed.
Evaluates: MAX115/MAX116
Sampling Tool
sample data rates 40ksps (samples second), select "Sampling Tool" from "Window" menu, make your selections, click Start button. timing delays adjusted appropriate control sample rate. effective sample rate estimated taking reciprocal delay between samples, power-up delay conversion time. Sample size restricted power two, that data processed tool. sample size control controls number samples collected each selected channel. After samples have been collected, data automatically uploaded host graphed. Once displayed, data optionally saved file.
Tool
MAX115 evaluation software includes (Fast Fourier Transform) tool that display spectral content data collected with high-speed sampling tool. view spectral content waveform, first select data sample that previously collected with high-speed sampling tool. Then, select "FFT Tool" from "Window" menu. Check output plots desired, click Start button. data windowing function preprocesses data sample before performing FFT. When input signal synchronized sampling clock, spectral energy appears leak into nearby frequency buckets. suitable data
One-Shot Read Tool
One-Shot Read Tool allows direct control configuration. Select channel mode operation update Control Byte display, change Control Byte bits directly observe change channel selection control. Read button writes configuration information A/D, performs reading.
Power Cycling Tool
reduce average supply current demand, MAX115 shut down between conversions. From
MAX115 Evaluation Evaluates: MAX115/MAX116
window tapers data zero amplitude beginning end, reducing this spectral leakage. more information fast fourier transform data windowing functions, refer W.H.Press Numerical Recipes Pascal: Scientific Computing, Cambridge University Press, 1989, ISBN 0521-37516-9. MAX115. chip-select output 7E800 memory-mapped area, which system uses generate conversion start strobe that signals MAX115 sample inputs.
Measuring Supply Current
supply current monitored measuring voltage across resistor (for supply) (for supply). These resistors ±1%, thus 0.001V across represents 10µA supply current.
Device Characteristics
device characteristics dialog contains parameters that expected change often. device selection used evaluate devices similar main device type. Evaluating MAX116 MAX115 software evaluate MAX116 directly. From "Window" menu, pick "Device Characteristics". Next, change device type from MAX115 MAX116. This tells program that input voltage span ±VREF instead ±2VREF. Changing Reference Voltage MAX115 software assumes +2.5V reference voltage, unless otherwise specified. Apply external +2.5V reference REFIN overdrive internal reference. MAX115 data sheet more information. From "Window" menu, select "Device Characteristics". Type reference voltage into reference voltage edit box.
Troubleshooting
Problem: output measurement. System seems report zero voltage, fails make measurement. Check supply voltages. Check 2.5V REFOUT reference voltage using digital voltmeter. oscilloscope verify that 16MHz clock running that conversion-start signal being strobed. Problem: Measurements erratic, unstable; poor accuracy. Check reference voltage using digital voltmeter. oscilloscope check noise. When probing noise, keep oscilloscope ground return lead short possible, preferably less than (10mm). Problem: Inputs appear wrong channels. Check MAX115 clock with oscilloscope. crystal oscillator module with fast rise/fall times overshoot undershoot power supply rails, violating device operation limits. lowpass filter (such MAX115 kit) eliminate clock overshoot.
Detailed Description Hardware
MAX115 (U1) high-speed, multichannel, 12-bit data-acquisition system with simultaneous track/holds. Linear regulators make clean analog power supplies MAX115. filter digital noise analog power supply. isolates CONVST signals from main system further prevent digital noise from entering MAX115. Refer Figure MAX115 Schematic MAX115 data sheet. chip-select output 7E000 memorymapped area, which system uses write configuration byte read data from
P1-5 N.C. P2-1 D0/A2 (LSB) D1/A3 CH4A CH4A CH4B CH4B CH3A CH3A CH3B CH3B CH2B CH2B CH2A CH2A CH1B CH1B CH1A CH1A P2-2 P2-3 P2-4 P2-5 P2-6 P2-7 REFIN 0.1µF REFOUT 0.1µF REFOUT 4.7µF 6.3V AGND AGND AVSS DGND REFIN DVDD AVDD 0.1µF 0.1µF N.C. 0.1µF 10µF
LM78L05ACM
P1-6
Figure MAX115/MAX116 Schematic
P2-14 P1-20 CONVST P2-13 P2-12 P2-11 74HCT244 P2-10 P2-9 P2-8
+12V
CS7/7E000
P1-35
P1-38
16MHz OSCILLATOR 100pF
P1-37
MAX115 MAX116
CS8/7E800
P1-36
74HCT244
N.C. N.C. 10µF 0.1µF
LM79L05ACM
P1-1 P1-2 0.1µF P1-3 P1-4
P1-9
Evaluates: MAX115/MAX116
-12V
MAX115 Evaluation
MAX115 Evaluation Evaluates: MAX115/MAX116
1.0"
Figure MAX115/MAX116 Component Placement Guide
Figure MAX115/MAX116 Board Layout Component Side
MAX115 Evaluation Evaluates: MAX115/MAX116
1.0"
Figure MAX115/MAX116 Board Layout Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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