MAX1270 Kit/EV System MAX1270 evaluation system system) complete,

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MAX1270 Kit/EV System MAX1270 evaluation system system) complete,

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MAX1270 Kit/EV System
MAX1270 evaluation system system) complete, 8-channel data-acquisition system, consisting MAX1270 evaluation kit) Maxim 68HC16MODULE-DIP microcontroller (µC) module. designed evaluate MAX1270/MAX1271, multirange, 8-channel, 12-bit data-acquisition system. Windows 3.1TM/Windows 95software provides handy user-interface exercise MAX1270's features. Order complete system (MAX1270EVC16) comprehensive evaluation MAX1270 MAX1271, using personal computer. Order (MAX1270EVKIT) have already purchased module (68HC16MODULE-DIP) with another Maxim system custom other µC-based systems. MAX1270 also used evaluate MAX127 MAX128. Proven Board Layout Complete Evaluation System Samples 12ksps Convenient Test Points Provided On-Board Data-Logging Software with Capability Fully Assembled Tested
Features
Evaluates: MAX1270/MAX1271/MAX127/MAX128
Ordering Information
PART MAX1270EVKIT MAX1270EVC16 TEMP. RANGE +70°C +70°C INTERFACE TYPE User-Supplied Windows Software
Note: MAX1270 software used only with complete evaluation system (MAX1270ECV16), which includes 68HC16MODULE-DIP module with MAX1270EVKIT.
Component Lists
MAX1270EVKIT Component List
DESIGNATION C12, C13, C2-C9 C11, JU2, R2-R5 R6-R13 DESCRIPTION 0.1µF ceramic capacitors 0.01µF ceramic capacitors 0.01µF ceramic capacitor 4.7µF, tantalum capacitors 22µF, aluminum electrolytic capacitor Dual common-cathode Schottky diode 3-pin header 2-pin headers resistor Open resistors resistor 8-pin header 28-pin socket, 0.300in. width MAX1270ACNG None None DESIGNATION DESCRIPTION 14-pin sockets 14-pin headers with four jumper wires (2-3, 5-6, 9-10, 12-13) 4.096V voltage reference MAX6141BCSA 30mA linear regulator MAX1615EUK board Software disk, "MAX1270 Evaluation Kit"
MAX1270EVC16 Component List
PART MAX1270EVKIT 68HC16MODULE-DIP DESCRIPTION MAX1270 evaluation 68HC16 module with 16-bit parallel interface
Windows Windows trademarks Microsoft Corp. Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1270 Kit/EV System Evaluates: MAX1270/MAX1271/MAX127/MAX128
MAX1270 Software
Windows Application Program Files
MAXADC.EXE MAX1270.HLP MAX1270.DLL MAXADC.INI MAX1270.C16 Application program that runs under Window Windows Help file MAXADC personality module MAX1270 Program settings file Software loaded into 68HC16 microcontroller EVKIT.ASM KIT1270.ASM
68HC16 Source Code Files
Main source code KIT1270.C16 program, provided reference. Compiled with Motorola 68HC Macro Assembler, version 4.1. Maxim holds copyright allows customers adapt program their without charge. Source code defining program interface with Maxim 68HC16 module (rev. Source code adding enhanced services (rev. older Maxim 68HC16 module (rev. Source code defining program interface with Motorola QSPI(Queued Serial Peripheral Interface) Source code defining program interface with Motorola peripheral. Provides general-purpose pins.
Install/Uninstall Program Files
INSTALL.EXE INSTALL16.EXE UNINST.EXE UNINST32.EXE UNINST.INI UN-MAXIM.PIF Installs files your computer Installs files your computer Removes files from your computer Removes files from your computer Database uninstall program Windows program information file uninstall GPT.ASM QSPI.ASM UPGRADE1.INC
MAX1270 Evaluation System
MAX1270 system operates from user-supplied +12V 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.
Evaluating MAX127/MAX128
MAX1270 board used evaluate MAX127 MAX128 with user-supplied, 2-wire controller software. Replace with MAX127ACNG MAX128ACNG. default trace back board under (marked with arrow). Short pins jumper JU1. Connect your two-wire interface SCL, SDA, GND. Install resistors With address select pins pulled down two-wire device address 01010000 writing commands part 01010001 reading data from part. Refer MAX127 data sheet waveforms timing requirements. Note: MAX1270 system software does support MAX127 MAX128.
MAX1270/MAX1271 Stand-Alone
MAX1270 provides proven board layout facilitate evaluation MAX1270. Apply your system's ±12V power-supply rails OPAMP+ OPAMP- terminals. Connect your system ground return. OPAMP+ input powers MAX1615 linear regulator MAX6141 voltage reference. must interfaced appropriate timing signals proper operation. Connect your three-wire interface SCLK, DIN, DOUT, GND. Leave open. drive install resistor drive SHDN, install resistor Make sure position (factory setting). Refer MAX1270 data sheet waveforms timing requirements.
Quick Start
Recommended Equipment
will need following equipment before begin: small power supply, +12V 200mA
QSPI trademark Motorola Corp.
MAX1270 Kit/EV System Evaluates: MAX1270/MAX1271/MAX127/MAX128
PC-compatible computer running Windows Windows spare serial communications port, preferably 9-pin plug serial cable connect computer's serial port Maxim 68HC16MODULE-DIP module Procedure Carefully connect boards aligning 40-pin header MAX1270 with 40-pin connector 68HC16MODULE-DIP module. Gently press them together. boards should flush against another. Connect +12V DC-power source module terminal block located next 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 required. software checks modem status lines (CTS, DSR, DCD) confirm that correct port been selected. Install software your computer running INSTALL.EXE program floppy disk. program files copied icons created Windows Program Manager Windows Start Menu). software evaluates both MAX1270 MAX1271. Start MAX1270 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 KIT1270.C16 module. When software successfully establishes communication with board, will Device Characteristics Tool some other windows. default device setting MAX1270. using MAX1271, select MAX1271 Device Characteristics dialog box, click Apply button. Apply input signals inputs labeled CH0-CH7, right edge MAX1270 board. Observe readout screen.
Using Buffers
Applications measuring high-impedance sources require buffers ensure full measurement accuracy. MAX1270EVKIT used with optional usersupplied quad buffers. Simply unplug 14pin headers install suitable unitygain-stable quad amp.
Detailed Description Software
various program functions grouped into dialog boxes that accessible from Window menu main menu bar.
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. Activate buttons pressing space bar. up/down arrow keys check boxes, radio buttons, combo boxes.
Scan Tool
take readings automatically from selected channels regular intervals samples second selecting Scan Tool from Window menu. Channel Selection Configuration group controls which channels will scanned. Scan-Rate combo controls rate which measurements made. Readings displayed Recent Values text area.
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
MAX1270 Kit/EV System Evaluates: MAX1270/MAX1271/MAX127/MAX128
Low-Speed Data Logging
optionally record readings into data file. Click button begin data logging. File Format dialog displayed. complete line data written after enabled channels have been sampled. first line file contains column headings. Each subsequent line contains enabled channels, separated commas, tabs, spaces (previously selected File Format dialog box). Once file been opened, paused resumed with Pause button. program continues write data file until Stop button clicked. External-Clock Mode operate external-clock mode clocks conversion), select External Clock from list choices under Power-Up Mode.
Sampling Tool
sample data rates 12ksps (samples second), select Sampling Tool from Window menu, make your selections, click Start button. Adjust timing delays appropriate control sample rate. Estimate effective sample rate taking reciprocal delay between samples, power-up delay, conversion time. Sample size restricted power two, that Fast Fourier Transform Tool (FFT) process data. Sample Size controls number samples collected each selected channel. After samples have been collected, data automatically uploads host graphed. Once displayed, data saved file.
One-Shot Read Tool
One-Shot Read Tool allows direct control configuration. Select channel mode operation update Control Byte display, change individual bits within Control Byte directly, observe change channel selection control. Read button writes configuration information performs reading.
Tool
MAX1270 evaluation software includes Tool that display spectral content data collected with Sampling Tool. view spectral content waveform, first select data sample that previously collected with Sampling Tool, then select 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 bins. suitable data window tapers data zero amplitude beginning end, reducing spectral energy leak. more information Fast Fourier Transform data-windowing functions, refer Press, al., Numerical Recipes Pascal: Scientific Computing, Cambridge University Press, 1989, ISBN 0-521-37516-9.
Power-Cycling Tool
When using internal reference, MAX1270 shut down between measurements reduce average supply-current demand. From 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 (delay between samples). MAX1270 software performs power-up writing configuration selecting standby mode. After powering-up, power-up delay executed allow time reference voltage stabilize accurate measurement. Internal-Clock Mode operate internal-clock mode clocks conversion), select Internal Clock from list choices under Power-Up Mode.
Noise-Analysis Tool
evaluation software includes Noise-Analysis Tool that calculates some statistics data collected with Sampling Tool. view statistical analysis, first select data sample previously collected with Sampling Tool, then select Noise-Analysis Tool from Window menu. Minimum maximum values smallest largest values that occur data record. Peak-topeak voltage calculated difference between minimum maximum values.
MAX1270 Kit/EV System
Average value arithmetic mean; i.e., values divided number samples. Standard deviation used approximation voltage.
Evaluates: MAX1270/MAX1271/MAX127/MAX128
Table Jumper Functions
JUMPER STATE 2-3* FUNCTION MAX127 MAX128. 2-wire interface signals test points. MAX1270 MAX1271. 3-wire interface signals test points, 68HC16 module supplied software. Enable U1's internal reference. must open. Disable U1's internal reference. Refer Table Voltage Reference Truth Table. open, selects internal reference. closed, user must provide reference VREF input pad. Refer Table Voltage Reference Truth Table. voltage reference Jumper must closed.
Device Characteristics
Device Characteristics dialog used select between MAX1270 MAX1271. Evaluating MAX1271 MAX1270 software evaluate MAX1271 directly. From Window menu, pick Device Characteristics. Next, change device type from MAX1270 MAX1271 click Apply button. This tells program that input voltage span ±VREF instead ±10V. Changing Reference Voltage MAX1270 software assumes 4.096V reference voltage, unless otherwise specified user. on-board MAX6141 reference (VREF 4.096V) close JU3. external, user-supplied reference, close JU2, open JU3, apply reference VREF pad. internal reference, open JU3. MAX1270 data sheet more information. From Window menu, select Device Characteristics, then type reference voltage into Reference Voltage edit box.
Open Closed*
Open
Closed*
Table Voltage Reference Truth Table
Open Open Closed Closed Open Closed Open Closed FUNCTION Enable U1's internal reference Invalid operating configuration User must provide reference voltage reference
Detailed Description Hardware
MAX1270/MAX1271/MAX127/MAX128 analogto-digital converter. bypasses internal bandgap reference, bypasses 4.096 volt reference output. Sockets accommodate optional unity-gain-stable quad buffers. C2-C9 R6-R13 form anti-aliasing input filters eight input channels. optional MAX6141 external reference. linear regulator that provides when used stand-alone mode.
Troubleshooting
Problem: output measurement. System seems report zero voltage fails make measurement. Check supply voltage. Check buffer opamp supply voltages applicable. Check REFADJ reference voltages using digital voltmeter. oscilloscope verify that (SCLK/SCL) receiving clock strobe pulses. Verify that SHDN being pulled low. Problem: Erratic, unstable measurement. oscilloscope measure: VREF-increase reference capacitor necessary. SHDN-ensure that shutdown mode activated. Analog input (while triggering DIN)-large voltage disturbances cured using buffer (see Buffers section).
Measuring Supply Current
Supply current monitored measuring voltage across resistor This resistor ±5%, every across represents 100µA supply current.
Evaluates: MAX1270/MAX1271/MAX127/MAX128
MAX1270 Kit/EV System
Figure MAX1270 Schematic
0.1µF VREF 4.7µF REFADJ 0.01µF J1-5 J1-6 J1-4 22µF MAX6141 CMPSH-3C VREF OPAMP+ 0.1µF OPAMPV+ 0.1µF OPAMPV13 VREF DGND (VDD) OPEN MAX1270 REFADJ MAX1271 MAX127 SHDN MAX128 SSTRB (A2) DOUT (A1) DGND AGND (SDA) SCLK (SCL) (A0) OPEN N.C. N.C. N.C. N.C. OPEN OPEN
J1-7
J1-8
J1-1
J1-2 J1-3
DEFAULT TRACE
J1-30
J1-34
J1-35
J1-36
J1-37
J1-38
OPAMPV+ OPAMPV4
0.1µF
SHDN MAX1615
4.7µF
MAX1270 Kit/EV System Evaluates: MAX1270/MAX1271/MAX127/MAX128
1.0"
Figure MAX1270 Component Placement Guide- Component Side
1.0"
1.0"
Figure MAX1270 Board Layout-Component Side
Figure MAX1270 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 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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