Evaluates: MAX1110/MAX1112 19-1201 Rev 0 3/97 MAX1110 Evaluation System/ Evaluation Kit General Description Features The MAX1110 evaluation system (EV system) is a com- Proven PC Board Layout plete, 8-channel data-acquisition system consisting of a Complete Evaluation System Samples to 5ksps MAX1110 evaluation kit (EV kit) and a Maxim 3V 68L11D microcontroller (C) module. It is designed to evaluate Convenient Test Points Provided on Board the MAX1110, a low-power, +3V, 8-channel, 8-bit ana- Data-Logging Software log-to-digital converter (ADC) with an internal 2.048V ref- erence that directly interfaces to 3V microprocessors. Fully Assembled and Tested Windows 3.1 /Windows 95 software provides a handy user interface to exercise the MAX1110s features. The EV system is intended for comprehensive evalua- tion of the MAX1110 using a personal computer. Order the stand-alone EV kit if the 68L11D C module has Ordering Information already been purchased with a previous Maxim EV sys- tem, or for custom use in other C-based systems. PART TEMP. RANGE BOARD TYPE The MAX1110 EV kit and EV system can also be used to MAX1110EVKIT-DIP 0C to +70C Surface Mount evaluate the MAX1112, which operates on +5V and has MAX1110EVL11-DIP 0C to +70C Surface Mount a 4.096V internal reference. Simply order a free sample of the MAX1112CPP along with the MAX1110 EV kit. MAX1110 EV System Component List MAX1110 Stand-Alone EV Kit The MAX1110 EV kit provides a proven PC board lay- PART QTY DESCRIPTION out to facilitate evaluation of the MAX1110. It must be MAX1110EVKIT-DIP 1 MAX1110 evaluation kit interfaced to appropriate timing signals for proper 68L11DMODULE 1 68L11D C module operation. Refer to the MAX1110 data sheet for timing requirements. Apply your supply voltage between the VDD pad and the GND pad. Refer to Table 1 for jumper MAX1110 EV Kit configurations. Component List MAX1110 EV System DESIGNATION QTY DESCRIPTION The MAX1110 EV system operates from a user-sup- C1C8 8 0.01F ceramic capacitors plied 9V to 15V DC power supply. The Maxim 68L11D C9, C11 2 4.7F, 10V tantalum capacitors 3V C board uses a MAX667 linear regulator to gener- C10 1 0.1F ceramic capacitor ate the 3V logic supply. J1 1 2x20 right-angle socket Quick Start J2 1 8-pin header 1) Install the MAX1110 EV kit software on your comput- JU1, JU2, JU3 3 2-pin jumper blocks er by running the INSTALL.EXE program on the flop- py disk. The program files are copied and icons are JU4 1 3-pin jumper block created for them in the Windows 3.1 Program JU5 0 Open Manager (or the Windows 95 Start Menu). R1R8 8 10k, 5% resistors 2) Check the jumper settings on the MAX1110 EV kit R9 1 10, 5% resistor board. Refer to Table 1, Jumper Functions, and U1 1 Maxim MAX1110CPP Table 2, Default Jumper Settings. U1 1 20-pin socket 3) Carefully connect the boards by aligning the 40-pin None 1 PC board header of the MAX1110 EV kit with the 40-pin con- nector of the C module. Gently press them togeth- Software disk, None 1 er. The two boards should be flush against one MAX1110 EVALUATION KIT another. Windows is a registered trademark of Microsoft Corp. Maxim Integrated Products 1 For free samples & the latest literature: MAX1110 Evaluation System/ Evaluation Kit 4) Connect a 9V to 15V DC power source to the C power-up delay requirement depends on the value of module at the terminal block located next to the the reference capacitor (C9) and the off-time (delay on/off switch, in the upper-right corner of the C between samples). module. Observe the polarity marked on the board. The MAX1110 EV kit software performs power-up by 5) Connect a cable from the computers serial port to starting a conversion and discarding the reading. When the C module. If using a 9-pin serial port, connect the power-up delay is complete, the reference voltage a straight-through, 9-pin female-to-male cable. If the is correct, and an accurate measurement can be per- only available serial port uses a 25-pin connector, a formed. standard 25-pin to 9-pin adapter is required. The EV Measuring Supply Current kit software checks the modem status lines (CTS, On the EV kit board, the MAX1110 draws all its power DSR, DCD) to confirm that the correct port has been through jumper JU5, which is wired closed when the selected. board is shipped from the factory. To measure the 6) Start the MAX1110 program by opening its icon in MAX1110s supply current, modify the board (with the the Program Manager (or Start Menu). power off) by cutting jumper JU5 and connecting a cur- 7) The program prompts you to connect the C mod- rent meter across JU5. ule and turn its power on. Slide SW1 to the ON posi- Low-Speed Data Logging tion. Select the correct serial port, and click OK. The The RS-232 serial link limits the data-logging sample program automatically downloads KIT1110.L11 to rate to no more than 10 samples per second. The Log the module. menu can be used to write data to a user-specified file 8) Apply input signals to the CH0CH7 inputs at the in comma-spaced-value text format. From the Log right edge of the MAX1110 EV kit board. Observe menu, select Select Channels, and select the channels the readout on the screen. you want to log. Next, pick the New Log File command from the Log menu. Once a log file has been opened, it Evaluating the MAX1112 can be paused or resumed with the Pause command. To evaluate the MAX1112, turn off power to the kit, One complete line of data is written after all enabled replace U1 with a MAX1112CPP, and set V to 5V by DD channels have been sampled. The first line of the log adjusting trim pot R2 on the 68L11D module. No other file contains the column headings. Each subsequent hardware changes are necessary. Start the MAX1110 line of the log file contains all enabled channels, sepa- software, and change the assumed reference voltage rated by commas, tabs, or spaces. The program con- from 2.048V to 4.096V. Refer to the section Changing tinues to write data to the log file until the Done com- the Reference Voltage. mand is selected from the Log menu. Detailed Description of Software High-Speed Data Sampling Shutdown Power Cycling For sampling rates up to 5ksps, the high-speed sam- To reduce average supply-current demand, the pling commands can be used. Data can be collected MAX1110 can be shut down between conversions. from any single channel at high speed, using the com- From the Power menu, select Full Power-Down mode. mands on the Sample menu. First, select the number of The amount of power savings depends primarily on samples. Then, set the sampling rate by inserting a how long the part is off between conversions. The delay between samples, or choosing one of the preset accuracy of the conversions depends on the power-up sample rates. To begin collecting data, use the Collect delay, the reference capacitor, and the time in power- command. After the samples have been collected, the down. Adjust the off-time with the Delay Between data is automatically uploaded to the host and is Samples command. Adjust the on-time with the Power- graphed. The data can optionally be saved to a file. Up Delay command. Changing the Reference Voltage Using an adequate power-up delay ensures conversion The MAX1110 EV kit software assumes a 2.048V refer- accuracy during power-cycling modes. The reference ence voltage, unless otherwise specified. To change must be allowed enough time to stabilize before the the reference voltage assumption, use Set Reference measurement is performed. The Power-Up Delay com- Voltage under the Device menu. mand controls the power-up delay. Increase the delay until no further change in accuracy is observed. The 2 Evaluates: MAX1110/MAX1112