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| 19-1490; Rev 0; 5/99 MAX1403 EV System General Description The MAX1403 evaluation system (EV system) is a complete, multichannel data-acquisition system consisting of a MAX1403 evaluation kit (EV kit) and a Maxim 68HC11 microcontroller (C) module. The MAX1403 is a lowpower, multichannel, serial-output analog-to-digital converter (ADC). Windows 95/98TM-compatible software provides a handy user interface to exercise the MAX1403's features. Source code in C++ and 68HC11 assembly language is provided for the low-level portion of the software. Order the EV system for comprehensive evaluation of the MAX1403 using a personal computer. Order only the EV kit if the 68HC11 C module has already been purchased with a previous Maxim EV system or for custom use in other C-based systems. The MAX1403 EV kit and EV system can also be used to evaluate the MAX1401. Simply order a free sample of the MAX1401CAI along with the MAX1403EVKIT. o Easy to Configure o Collects Up to 8192 Samples at Full Speed o Complete Evaluation System o Proven PC Board Layout o Fully Assembled and Tested Features Evaluates: MAX1401/MAX1403 Ordering Information PART MAX1403EVKIT MAX1403EVL11 TEMP. RANGE 0C to +70C 0C to +70C INTERFACE TYPE User-Supplied Windows Software Note: The MAX1403 software can be used only with the complete evaluation system (MAX1403EVL11), which includes the 68L11DMODULE together with the MAX1403EVKIT. MAX1403 Stand-Alone EV Kit The MAX1403 EV kit provides a proven PC board layout to facilitate evaluation of the MAX1403 with user-provided software and hardware. It must be interfaced to appropriate timing signals for proper operation. Refer to the MAX1403 data sheet for timing requirements. See Table 2 for jumper functions. DESIGNATION QTY C3-C8 C9, C10, C11 C12, C13 C15 J1 J2 JU1-JU8 R1-R6 R7, R8 PART MAX1403EVKIT 68L11DMODULE QTY 1 1 DESCRIPTION MAX1403 Evaluation Kit 68HC11 C Module R9 R10 U1 U2 6 3 0 1 1 1 0 6 2 0 0 1 1 MAX1403 EV Kit Component List DESCRIPTION 100pF ceramic capacitors (1206) 0.1F ceramic capacitors (1206) Not installed 2.2F aluminum electrolytic radialleaded capacitor 2 x 20 right-angle socket Female SMA connector Not installed 100, 5% resistors (1206) 10, 5% resistors (1206) Not installed Not installed Component Suppliers Maxim MAX1403CAI Maxim MAX6520EUR (SOT23 voltage reference, 1.2V, 20ppm/C max) 2.4576MHz ceramic resonator Murata CST2.45MGW040 3" x 4" PC board MAX1403 evaluation kit 3 1/2" software disk MAX1403 evaluation kit Maxim 68HC11 module monitor, ROM Version 1.1 (Version 1.0 ROM will not work with this EV kit.) 1 MAX1403 EV System The MAX1403 EV system operates from a user-supplied +5V to +12V DC power supply. MAX1403 EV System Component List Y1 None None 1 1 1 None 1 Windows 95/98 is a trademark of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX1403 EV System Evaluates: MAX1401/MAX1403 MAX1403 EV Kit Files Windows Application Program Files FILE MAX1403.EXE MAX1403.HLP KIT1403.L11 MAX1403.INI DESCRIPTION Application program that runs under Windows 95/98 Help file Software loaded into 68HC11 microcontroller Program settings file _________________________Quick Start Recommended Equipment Obtain the following equipment before you begin: * A DC power supply that generates +5VDC to +12VDC at 30mA to 50mA * An IBM PC-compatible computer running Windows 95/98 * A spare serial communications port, preferably a 9pin plug * A serial cable to connect the computer's serial port to the Maxim 68HC11 Module 1) Before you begin, make sure your 68HC11 module has the Rev. 1.1 ROM. The software will not function with the Rev. 1.0 ROM. 2) Carefully connect the boards by aligning the 40-pin header of the MAX1403 EV kit with the 40-pin connector of the 68HC11 module. Gently press them together. The two boards should be flush against one another. 3) Connect the DC power source to the C module at terminal block J2, 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 will be required. The EV kit software checks the modem status lines (CTS, DSR, DCD) to confirm that the correct port has been selected. 5) Install the software on your computer by running the INSTALL.EXE program from the floppy disk. The program files are copied and icons are created for them in the Windows 95/98 Start Menu. The EV kit software evaluates both the MAX1403 and the MAX1401. 6) Start the MAX1403 program by opening its icon in the Start Menu. 7) The program will prompt 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 will automatically download the file KIT1403.L11 to the module. Example Source Code Files FILE DESCRIPTION Source code module for driving the MAX1403, provided for reference. Includes definitions of the register names and lowlevel access routines. Compiled with Borland C++ 4.52. Maxim holds the copyright but allows customers to adapt the program for their own use without charge. Header file for MAX1403.CPP, provided for reference. MAX1403.CPP MAX1403.H 68HC16 Source Code Files FILE DESCRIPTION Main source code for the KIT1403.L11 program, provided for reference. Maxim holds the copyright but allows customers to adapt the program for their own use without charge. Source code defining the program interface with the Maxim 68HC11 Module ROM (Rev. 1.1). KIT1403.ASM EVKIT.ASM Install/Uninstall Program Files FILE INSTALL.EXE UNINST.INI UNMAXIM.EXE DESCRIPTION Installs the EV kit files on your computer. Database for uninstall program. Removes the EV kit files from your computer. This file is automatically copied to C:\WINDOWS during installation. 2 _______________________________________________________________________________________ MAX1403 EV System 8) When the software successfully establishes communication with the EV kit board, you will see a configuration tool and some other windows. Verify that the CLKIN and Reference Voltage settings are correct. Close or minimize this dialog box. 9) Apply input signals to the inputs labeled AIN1-AIN5, at the bottom edge of the MAX1403 EV kit board. AIN6 is analog common. Observe the readout on the screen. The EV kit software assumes that CALOFF+ and CALOFF- are grounded so that CALOFF measures 0V. Similarly, the software assumes that CALGAIN+ is connected to REFIN+ and CALGAIN- is connected to REFIN- so that CALGAIN measures the reference voltage. These two points calibrate the code-to-voltage translation function performed in the software. The MAX1403 automatically triggers its measurements, unless the FSYNC control bit is set. The EV kit software communicates with the MAX1403 at intervals determined by the Update Every combo box. To halt this automatic update, uncheck the Update Every checkbox or change the Update Every to a value between 100ms and 60,000ms. Normally, the microcontroller collects new data as soon as it becomes available by using the INT pin to trigger an interrupt service routine. If the INT pin is not used as an interrupt, then the MAX1403 must not be operated in free-running mode. Check or uncheck the Use INT Interrupt checkbox to configure the evaluation kit software. Evaluates: MAX1401/MAX1403 Upgrading the 68HC11 Module The MAX1403 EV kit requires Rev. 1.1 of the Maxim 68HC11 Module ROM. Check the label on device U10 on the module; if it says "Rev. 1.0," the device must be replaced. The Rev. 1.1 ROM is a 28-pin DIP that comes with the EV kit. If it was omitted, contact the factory for a replacement. To install the new ROM, use the following procedure. Use antistatic handling precautions. To reduce the risk of ESD damage, gather all required materials and perform the installation at one sitting. 1) Slide the ON/OFF switch to the OFF position. 2) Using a flat-blade screwdriver, gently pry U10, the REV 1.0 ROM, out of its socket. 3) Remove the REV 1.1 ROM from its antistatic packaging. 4) Align the REV 1.1 ROM in the U10 socket pins. Observe correct polarity (the notch at the top of the ROM). Verify that the pins are lined up with the socket, and gently press the ROM into place. Proceed to the regular Quick Start instructions. Configuration Tool The Configuration Tool controls parameters that apply to the entire EV kit. Like the other windows, the Configuration Tool can be activated from the Show menu of the main menu bar. The CLK control should match the external ceramic resonator or crystal that sets the master clock frequency. The VREF Reference Voltage control tells the software what the reference voltage is. This is used to convert the raw A/D output codes into the corresponding input voltage to speed user evaluation. The Data-Rate control determines how often the MAX1403 performs a measurement. Some data rates provide 16-bit, noise-free resolution when used with the SINC3 filter (discussed below). The Filter Sync control can be used to inhibit the MAX1403 from performing its self-timed measurements. The Buffer Inputs checkbox enables the internal input buffers. The Burnout Test Currents checkbox enables two small (0.1A) current sources to provide an input stimulus. When used with a transducer, these current sources can be used to verify that the transducer has not failed open or short circuit. At the bottom of the window are input voltage-range selection buttons. These buttons configure all input channels for the same input voltage range. Although the MAX1403 can be operated with three different input ranges at the same time, the EV kit software supports only a single range for all channels. Detailed Description _________________________of Software The MAX1403 digitizes up to seven inputs. The various program functions are grouped into windows that are accessible from the Show menu on the main menu bar. Main Display The main display shows the calculated input voltage and raw A/D output code for each active channel. Although there are nine input channels, only certain configurations are allowed. Select any single channel or one of the scanning sequences from the Inputs menu. AIN 1-6 designates an analog input between the AIN1 pin and the AIN6 pin. CALOFF designates the signal between the CALOFF+ and CALOFF- pins. CALGAIN designates the signal between the CALGAIN+ and CALGAIN- pins. _______________________________________________________________________________________ 3 MAX1403 EV System Evaluates: MAX1401/MAX1403 The digital filter on the MAX1403 can be configured for SINC3 or SINC1 operation, which affects the filter cutoff frequency. (SINC1 means SIN(X) / X, and SINC3 means (SIN(X) / X)3.) The SINC3 filter is required for 16-bit accuracy. The SINC1 filter provides faster settling time with less accuracy. Alternatively, the raw modulator output can be driven out the DOUT pin; however, the EV kit software cannot read data from the MAX1403 in this mode. the Begin Sampling button. Sampling rate is controlled by the Configuration tool. Sample size is restricted to a power of two. Sample Size controls the number of samples collected on each selected channel. After the samples have been collected, the data is automatically uploaded to the host and is graphed. Once displayed, the data may be saved to a file. While the Sampling tool is open, the other windows are locked out. Close the Sampling tool by clicking the Close icon in the upper corner. Calibration Tool The MAX1403 EV kit software can average the measurements from the calibration channels and use the measured values to correct the voltage displays. The calibration algorithm assumes that the CALOFF inputs are externally connected together and that the CALGAIN inputs are externally connected to the reference voltage (VREF). View the calibration tool by selecting it from the Show menu. The software automatically disables calibration if either of the calibration channels reports a code of 0 or 262143. This is to prevent erroneous calibration when using a transfer function that does not include both 0V and VREF. When Use CALOFF and CALGAIN for Calibration is checked, the software averages the raw A/D codes for the CALOFF and CALGAIN channels. The average is calculated as a weighted sum of the new data and the old average value. The Slower/Faster slide bar controls the weight of the new data vs. the weight of the old average. The EV kit software assumes that all three transfer function registers are set to the same value. This calibration affects only the displayed voltage, not the raw code numbers. The average CALOFF and CALGAIN code values are used as the endpoints of a linear interpolation, with CALOFF measuring 0V and CALGAIN measuring VREF. The linear interpolation formula is as follows: Voltage = VREF(Code - CALOFFcode) (CALGAINcode - CALOFFcode)PGAgain Register Display Tool This tool displays all of the internal registers of the MAX1403. Modify any bit value by checking or unchecking its box. (The START bit and the zero bits in the Special Function register (SFR) cannot be modified). The Read All Registers button causes the software to read all of the MAX1403's registers. (Not functional when the MDOUT or FULLPD bit is set.) Refer to Table 1 for a guide to register bit functions. Communications Register (COMMS) Setting the FSYNC control bit inhibits the MAX1403 from performing its self-timed measurements. If FSYNC = 1 when it is time to perform a measurement, the MAX1403 simply skips that measurement. Thus, power-line frequency rejection is not affected by the FSYNC bit. Setting the STDBY bit places the part in low-power standby mode. The serial interface and the CLK oscillator continue to operate. The part can be restored to normal operation by clearing the STDBY bit. Special Function Register (SFR) Setting the MDOUT bit makes the raw modulator output available on the DOUT pin; however, the EV kit software cannot read data from the MAX1403 in this mode. Setting the FULLPD bit in the SFR register places the part in full power-down mode. The master oscillator does not run. To restore normal operation, click on the Reset menu item in the main display. This causes the 68HC11 software to pulse the MAX1403 RESET pin. Transfer Function Registers (TF1, TF2, TF3) The three transfer function registers (TF1, TF2, TF3) control how input voltage is mapped to code values. The transfer function registers control a programmable-gain amplifier (PGA) and an offset-correction DAC. If U/B = 1, the transfer function maps unipolar voltages between 0V and VREF. If U/B = 0, then the transfer function maps bipolar voltages between -VREF and +VREF. Next, the PGA increases the code-per-volt pro- Note: When using the calibration tool with the MAX1403 in buffered mode, CALOFF+ and CALOFFshould be disconnected from GND and connected instead to REFIN+ so that they remain within the specified input range. Sampling Tool To sample data at full speed, select Sample from the main display menu, make your selections, and click on 4 _______________________________________________________________________________________ MAX1403 EV System cessing gain, reducing the full-scale voltage range by a factor of 1, 2, 4, 8, 16, 32, 64, or 128. Finally, the offsetcorrection DAC offsets the voltage range by up to 7/6 of the full-scale voltage range. Input pins AIN1 and AIN2 are controlled by TF1. Input pins AIN3 and AIN4 are controlled by TF2. Input pin AIN5 is controlled by TF3. Input pin AIN6 is the analog common. When SCAN = 1, the CALOFF and CALGAIN channels are controlled by TF3. When SCAN = 0, the CALOFF and CALGAIN channels are controlled by one of the transfer function registers, as selected by the A1 and A0 bits. For simplicity, the EV kit software assumes that all three transfer functions are configured alike. C = 100pF). When scanning between channels, the RC filter's settling time may increase the acquisition time required for full accuracy. Evaluates: MAX1401/MAX1403 Evaluating the MAX1401 The MAX1401 can be evaluated by shorting across jumpers JU6 and JU7. The MAX1401 is exactly like the MAX1403, except that the function of pins 5, 6, 7, and 8 is changed. Instead of the OUT1/OUT2 outputs and DS0/DS1 inputs, these pins are used to provide access to the analog signal between the multiplexer and the A/D converter. Tables 2 and 3 list the jumper functions and default settings. Refer to the MAX1401 data sheet for detailed information. Measuring Supply Current Supply current can be estimated by measuring the voltage across a series resistor. On the EV kit board, the MAX1403 draws all of its analog and digital power through R8, which is 10. In addition, all analog supply current flows through R7, which is also 10. Detailed Description ________________________of Hardware U1, the MAX1403, is a multichannel, high-resolution A/D converter (refer to the MAX1403 data sheet). U2, the MAX6520, is a 1.2V reference (refer to the MAX6520 data sheet). Y1 contains a ceramic resonator and its load capacitors. R1-R6, together with C3-C8, form anti-aliasing input filters. R8 and C11 filter the digital power supply. The analog supply comes through filter R7/C10. Troubleshooting Problem: unacceptable amounts of noise in the signal. Collect a sample of 1024 measurements at a 60Hz data rate. Observe whether the problem is caused by 60Hz noise. Any AC-powered equipment connected to the analog signal ground can inject noise. Try replacing AC-powered DVMs with battery-powered DVMs. Input Filtering The EV kit has an RC filter on each input with a time constant of approximately 0.01s = 10ns (R = 100, _______________________________________________________________________________________ 5 MAX1403 EV System Evaluates: MAX1401/MAX1403 Table 1. Guide to Register Bit Functions REGISTER COMMS BIT NAME 0/DRDY RS2-RS0 R/W RESET STDBY FSYNC GS1 A1 A0 MF1 MF0 CLK FS1 FS0 FAST GS2 SCAN M1 M0 BUFF DIFF BOUT IOUT X2CLK SFR MDOUT FULLPD TF1, 2, 3 G2-G0 U/B D3-D0 DATA D17-D0 DS1 DS0 CID2-CID0 DESCRIPTION Start bit is zero; DIN pin must be 1 when idle. Register select for subsequent operation Selects subsequent read or write operation Causes software reset when set to 1 Activates standby power-down mode when set to 1 Inhibits the A/D converter when set to 1 Selects the active channel Selects the active channel Selects the data output rate Selects the data output rate Selects the CLKIN frequency Selects the data output rate Selects the data output rate Selects SINC1 filter instead of SINC3 Enables the scanning sequences Enables the CalGain channel Enables the CalOff channel Enables the input buffers Selects differential input pairs Enables the transducer burn-out test currents Enables the OUT1 and OUT2 current sources (MAX1403 only) Selects the CLKIN frequency Changes the DOUT and INT pins to provide raw modulator output Activates full power-down mode. Use hardware reset to restore normal operation. All other bits in SFR must be zero Selects the PGA Gain Selects unipolar or bipolar coding Selects the offset correction DAC code; D3 = sign, D2-D0 = magnitude Raw code value Value of the DS1 input pin (MAX1403 only) Value of the DS0 input pin (MAX1403 only) Channel identification tag 6 ______________________________________________________________________________________ MAX1403 EV System Table 2. Jumper Functions JUMPER JU1 JU2 JU3 JU4 JU5 STATE Closed* Open Closed* Open Closed* Open Closed* Open Closed* Open Closed JU6 Open Disconnects pin 5 from pin 7 MAX1403: pin 5 = digital input DS1, pin 7 = current source MAX1401: insert filter between mux and A/D Connects pin 6 to pin 8 MAX1403: pin 6 = digital input DS0, pin 8 = current source MAX1401: normal operation Disconnects pin 6 from pin 8 MAX1403: pin 6 = digital input DS0, pin 8 = current source MAX1401: insert filter between mux and A/D Use on-board reference U2 (REFIN+ = 1.2V) REFIN+ and REFIN- must be driven by an external reference FUNCTION Use CalGain inputs for gain calibration (CALGAIN+ = REFIN+) Use CalGain inputs as general purpose signal inputs Use CalGain inputs for gain calibration (CALGAIN- = REFIN-) Use CalGain inputs as general purpose signal inputs Use CalOff inputs for offset calibration (CALOFF+ = GND) Use CalOff inputs as general purpose signal inputs Use CalOff inputs for offset calibration (CALOFF- = GND) Use CalOff inputs as general purpose signal inputs Use on-board reference U2 (REFIN- = GND) REFIN+ and REFIN- must be driven by an external reference Connects pin 5 to pin 7 MAX1403: pin 5 = digital input DS1, pin 7 = current source MAX1401: normal operation Evaluates: MAX1401/MAX1403 Closed JU7 Open Closed* Open JU8 * Default trace on top layer of PC board Table 3. Default Jumper Settings JUMPER JU1 JU2 JU3 JU4 JU5 JU6 STATE Closed* Closed* Closed* Closed* Closed* Open FUNCTION Use CalGain inputs for gain calibration (CALGAIN+ = REFIN+) Use CalGain inputs for gain calibration (CALGAIN- = REFIN-) Use CalOff inputs for offset calibration (CALOFF+ = GND) Use CalOff inputs for offset calibration (CALOFF- = GND) Use on-board reference U2 (REFIN- = GND) Disconnects pin 5 from pin 7 MAX1403: pin 5 = digital input DS1, pin 7 = current source MAX1401: insert filter between mux and A/D Disconnects pin 6 from pin 8 MAX1403: pin 6 = digital input DS0, pin 8 = current source MAX1401: insert filter between mux and A/D Use on-board reference U2 (REFIN+ = 1.2V) JU7 JU8 Open Closed* * Default trace on top layer of PC board _______________________________________________________________________________________ 7 Evaluates: MAX1401/MAX1403 MAX1403 EV System Figure 1. MAX1403 EV Kit Schematic J2 EXTCLK DGND 1 CLKIN CLKOUT DIN 27 J1-36 DVDD J1-35 10 J1-8 J1-29 R7 DGND AVDD 10 5 DS1 (MUXOUT+) DGND 6 DS0 (MUXOUT-) CALOFF+ OFFSET+ C13 SHORT OPEN CALOFFJU4 9 AGND REFIN+ 10 V+ REFINAIN1 CALGAIN+ 12 AIN2 CALGAIN13 AIN3 C8 100pF AIN5 C7 100pF AGND 15 AGND AIN6 16 C5 100pF AGND 14 AIN4 C6 100pF R6 AIN6 100 R5 AIN5 100 17 C4 100pF AGND C12 OPEN SHORT 18 R9 JU2 GAIN+ JU1 JU5 19 11 C3 100pF AGND C9 0.1F REF20 AGND REF+ JU8 AGND 21 OFFSETJU3 OUT2 (ADCIN+) OUT1 (ADCIN-) 22 R10 DGND 7 8 23 DVDD JU7 C10 0.1F C11 0.1F R8 J1-2 J1-3 J1-4 J1-7 J1-1 26 MISO INT 25 24 MOSI SCLK 28 J1-37 2 3 CS INT VDD 4 JU6 SCLK 8 U1 DOUT 1 Y1 2.4576MHz 3 2 DGND J1-34 J1-33 MAX1403 RESET (MAX1401) DS1 DS0 OUT2 OUT1 U2 MAX6520 J1-5 2 VOUT 1 VIN GND 3 C15 2.2F AGND J1-6 AVDD R1 AIN1 100 R2 AIN2 100 GAIN- R3 AIN3 100 R4 AIN4 AGND _______________________________________________________________________________________ 100 MAX1403 EV System Evaluates: MAX1401/MAX1403 1.0" Figure 2. MAX1403 EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 9 MAX1403 EV System Evaluates: MAX1401/MAX1403 1.0" Figure 3. MAX1403 EV Kit PC Board Layout--Component Side 10 ______________________________________________________________________________________ MAX1403 EV System Evaluates: MAX1401/MAX1403 1.0" Figure 4. MAX1403 EV Kit PC Board Layout--Solder Side ______________________________________________________________________________________ 11 MAX1403 EV System Evaluates: MAX1401/MAX1403 NOTES 12 ______________________________________________________________________________________ 68L11D Module _______________General Description The 68L11D module is an assembled and tested PC board intended for use with Maxim's low-voltage dataacquisition evaluation kits (EV kits). The module uses Motorola's MC68L11D0FN2 microcontroller (C) to collect data samples using the SPI interface. It requires an IBM PC computer and an external DC power supply of +5V to +16V, or as specified in the appropriate EV kit manual. Maxim's 68L11D module allows customers to evaluate selected Maxim products. It is not intended to be a microprocessor development platform, and Maxim does not support such use. ____________________Component List DESIGNATION QTY C1, C2 C3 C4-C9, C12-C18 C10, C11 D1 J1 J2 J3 JU1, JU2 LED1 R1 R2 R3 R4 R5 R6 SW1 SW2 U1 U2 U3 U4 U5 U10 U6 U7 U8 U9 U10 Y1 2 1 13 2 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 DESCRIPTION 22pF ceramic capacitors 0.01F ceramic capacitor 0.1F ceramic capacitors 22F, 20V tantalum capacitors 1N4001 diode 40-pin, right-angle header 2-circuit terminal block DB9 right-angle socket Open Light-emitting diode 10M, 5% resistor 100k potentiometer 274k, 1% resistor 133k, 1% resistor 200, 5% resistor 10k SIP resistor pack, pin 1 common Slide switch Momentary push-button switch Motorola MC68L11D0FN2 Maxim MAX3232CSE 74HC00 Maxim MAX667CSA 32k x 8 static RAM 28-pin socket Motorola MCM6306DJ15 28-pin socket 74HCT245 Maxim MAX708RCSA 74HC573 74HC139 3V, 8k x 8 ROM 8MHz crystal 68L11D Module ____________________Getting Started All system components are guaranteed by their various manufacturers over the +3V to +3.6V power-supply range. Not all system components are guaranteed over the entire 2.5V to 5V V DD power-supply adjustment range. Verify correct operation using the following procedures: 1) Connect a +5V DC power source (16V max) to the C module at the terminal block located next to the on/off switch, in the upper-right corner of the C module. Turn the power switch on. 2) 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. 3) Start the evaluation kit software on the IBM PC. When the program asks which port the C module is connected to, press the space bar until the correct port is highlighted, and then press ENTER. The software will be in terminal-emulation mode. (If using a generic terminal-emulation program instead of Maxim EV kit software, select 1200 baud, eight-bit character, no parity, one stop bit. Send a space character to start the monitor program.) 4) Adjust trim potentiometer R2 for the desired VDD supply voltage. Measure V DD between test point TP1 and ground. The mounting hole next to R2 is grounded. 5) To verify correct system operation, press the ESC key, type a capital "T", and then select the countdown memory test. If the memory test fails or any other malfunction is reported, the VDD voltage is too low; increase VDD and repeat from step 4. 6) Turn the power switch off and connect the C board to an appropriate Maxim EV kit board. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. 68L11D Module 68L11D Module _______________Detailed Description Power Requirements The 68L11D module draws its power from a user-supplied power source connected to terminal block J2. Note the positive and negative markings on the board. Nominal input voltages should be between +5V and +16V. The input current requirement for the 68L11D module is typically 20mA plus the current drawn by the evaluation kit (EV kit). The VDD supply is set by U4, a MAX667 low-dropout CMOS regulator. Trim potentiometer R2 sets the supply voltage, with an adjustment range of approximately 2.5V to 5V. Although the board is designed primarily for 3V applications, all of the circuitry is rated to withstand 5V levels. The 20 x 2-pin header (J1) connects the 68L11D module to a Maxim EV kit. Table 2 lists the function of each pin. Use the 68L11D module only with EV kits that are designed to support it, and download only code that is targeted for the Maxim 68L11D module. Downloading incorrect object code into the 68L11D module will produce unpredictable results. The 8k x 8 boot ROM (U10) checks the system and waits for commands from the host. Refer to the EV kit manual for specific startup procedures. Software All software is supplied on a disk with the EV kit. Software operating instructions are included in the EV kit manual. Serial Communications J3 is an RS-232 serial port, designed to be compatible with the IBM PC 9-pin serial port. Use a straight-through DB9 male-to-female cable to connect J3 to the IBM PC serial port. If the only available serial port has a 25-pin connector, use a standard 25-pin to 9-pin adapter. Table 1 shows J3's pinout. The hardware-handshake lines are used by the evaluation software to confirm that the EV kit is connected to the correct serial port. 68L11D Microcontroller (C) Module Hardware U1 is Motorola's 68L11D C. Contact Motorola for C information, development, and support. A MAX708R supervisory circuit on the module monitors the VDD logic supply, generates the power-on reset, and produces a reset pulse whenever the manual reset button (SW2) is pressed. Note that the MAX708R resets the CPU if the supply voltage falls below 2.66V. The module provides 32kbytes of external CMOS static RAM (U5). The 74HCT245 octal buffer (U6) provides access to an eight-bit port on the 40-pin interface connector. This memory-mapped port consists of Intel-compatible read and write strobes, four chip selects, four address LSB's, and eight data bits. Table 3 lists the address ranges for each of the memory-mapped elements on the 68L11D module. The MAX3232 is a 3V-powered, RS-232 interface voltage-level shifter. Its built-in charge pump uses external capacitors to generate the output voltages necessary to drive RS-232 lines. Table 1. Serial Communications Port J3 PIN 1 2 3 4 5 6 7 8 9 NAME DCD RXD TXD DTR GND DSR RTS CTS None FUNCTION Handshake; hard-wired to DTR and DSR RS-232-compatible data output from 68L11D module RS-232-compatible data input to 68L11D module Handshake; hard-wired to DCD and DSR Signal ground connection Handshake; hard-wired to DCD and DTR Handshake; hard-wired to CTS Handshake; hard-wired to RTS Unused 2 _______________________________________________________________________________________ 68L11D Module 68L11D Module Table 2. 40-Pin Data-Connector Signals PIN 1-4 5, 6 7, 8 9 10 11 12 13 14 15 16 17 18 19 20-26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 NAME GND V++ VDD RD WR CS0 CS1 CS2 CS3 ADDR0 ADDR1 ADDR2 ADDR3 DB0 DB1-DB7 PA0/IC3 PA1/IC2 PA2/IC1 PA3/IC4/OC5 PA4/OC4 PA5/OC3 PA6/OC2 PA7/OC1/PAI MISO MOSI SCK RESERVED E SS FUNCTION Ground Unregulated input voltage VDD from on-board MAX667 regulator Read strobe Write strobe Chip select for 8000-8FFF Chip select for 9000-9FFF Chip select for A000-AFFF Chip select for B000-BFFF Address bit 0 (LSB) Address bit 1 Address bit 2 Address bit 3 Data bus bit 0 (LSB) Data bus bits 1-7 General I/O port bit 0 (LSB) General I/O port General I/O port General I/O port General I/O port General I/O port General I/O port General I/O port MSB SPI master-in, slave-out SPI master-out, slave-in SPI serial clock Reserved for factory use System E-clock output SPI slave-select input Table 3. 68L11D Module Memory Map ADDRESS RANGE (HEX) 0000-7FFF 8000-8FFF 9000-9FFF A000-AFFF B000-BFFF C000-C03F C040-C0FF C100-CFFF D000-D03F D040-DFFF E000-FFFF FUNCTION User RAM area (U5) External chip-select 0 (J1 pin 11) External chip-select 1 (J1 pin 12) External chip-select 2 (J1 pin 13) External chip-select 3 (J1 pin 14) Unused Internal RAM (U1) Unused Internal register area (U1) Unused Boot ROM (U10) _______________________________________________________________________________________ 3 68L11D Module 68L11D Module J2 VPREREG D1 1N4001 SW1 C10 22F 20V VDD VDD C16 C12 0.1F C13 0.1F 1 3 4 5 11 16 VCC C1+ C1C2+ C20.1F V+ V2 6 C15 0.1F T1 14 0.1F J3-7 RTS J3-2 RXD J3-3 TXD J3-4 DTR J3-6 DSR 9 GND 15 J3-5 GND J3-9 RI PA0/IN3 PA1/IN2 PA2/IN1 PA3/IN4/OUT5 PA4/OUT4 PA5/OUT3 PA6/OUT2 PA7/OUT1/PULSE ACCIN RXD TXD MISO MOSI SCK SS RESET XIRQ IRQ 30 29 28 27 26 25 24 23 16 17 18 19 20 21 14 11 15 44 43 42 3 PA0 PC0 U1 4 PA1 PC1 5 PA2 PC2 MC68L11D0FN2 PC3 6 PA3 7 PA4 PC4 8 PA5 PC5 9 PA6 PC6 10 PA7 PC7 13 PD6/AS PD0/RXD PD1/TXD 12 PD7/R/W 39 PD2/MISO PB0 38 PD3/MOSI PD4/SCK PB1 37 PD5/SS PB2 36 PB3 35 RESET PB4 34 XIRQ/VPP PB5 33 IRQ/CE PB6 32 PB7 XTAL 41 EXTAL MODA/LIR 40 E MODB/VSTBY D0 D1 D2 D3 D4 D5 D6 D7 AS R/W A8 A9 A10 A11 A12 A13 A14 A15 MODA MODB R2 8 J3-1 DCD 4 PFI GND 3 SW2 RESET 1 C4 0.1F C3 0.01F C14 J3-8 CTS 4 1 2 3 VDD U4 DD MAX667 VIN VOUT LBI GND LBO VSET SHDN 8 7 6 5 1.255V R2 100k R4 133k 1% R3 274k 1% C11 22F 20V VDD U2 MAX3232 TXD VDD VCC 10 T2 7 U7 MAX708R MR PFO NC RESET RESET 5 6 8 7 RESET RXD 12 R1 13 POWER CONNECTIONS GND U1 1, 2 VDD 22 C17 0.1F VDD C2 22pF Y1 8.00MHz R1 10M C1 22pF E Figure 1. 68L11D Module Schematic Diagram 4 _______________________________________________________________________________________ 68L11D Module 68L11D Module U9A 74HC139 A14 A15 2 3 A0 A1 Y0 Y1 Y2 VDD GND 1 E Y3 4 5 6 7 IOBUFFER CS-11XXX A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 RD WR 10 9 8 7 6 5 4 3 25 24 21 23 2 26 1 20 22 27 A0 U5 A1 A2 32 x 8 STATIC RAM A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE I/0 I/1 I/2 I/3 I/4 I/5 I/6 I/7 11 12 13 15 16 17 18 19 D0 D1 D2 D3 D4 D5 D6 D7 VDD C5 0.1F A12 A13 U9B 74HC139 14 A0 13 A1 Y0 Y1 Y2 IOBUFFER 15 E Y3 12 11 10 9 CS8XXX CS9XXX CSAXXX CSBXXX C7 0.1F 1 R/W 2 U3A 74HC00 R/W E C6 0.1F 4 5 U3B 74HC00 R/W E 9 10 U3C 74HC00 E A13 12 13 U3D 74HC00 3 R/W VDD 6 RD 8 WR A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 VDD VDD 10 9 8 7 6 5 4 3 25 24 21 23 2 26 27 1 22 20 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 PGM VPP OE CE 10 U10 9 8 27LV64 8k x 8 ROM 7 6 5 4 3 25 24 21 23 2 26 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 11 12 13 15 16 17 18 19 D0 D1 D2 D3 D4 D5 D6 D7 VDD C8 0.1F 11 DATA-XX1X CS-11XXX POWER CONNECTIONS GND AS D0 D1 D2 D3 D4 D5 D6 D7 1 OE 11 C U8 2 3 4 5 6 7 8 9 D0 D1 D2 D3 D4 D5 D6 D7 VDD U3 19 18 17 16 15 14 13 12 A0 A1 A2 A3 A4 A5 A6 A7 U5 U8 U9 U10 14 28 20 16 28 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 GND 7 14 10 8 14 C18 0.1F VDD 74HC573 Figure 1. 68L11D Module Schematic Diagram (continued) _______________________________________________________________________________________ 5 68L11D Module 68L11D Module VDD R5 200 GND LED1 VDD IOBUFFER RD D0 D1 D2 D3 D4 D5 D6 D7 19 1 OE DIR U6 2 3 4 5 6 7 8 9 A1 A2 A3 A4 A5 A6 A7 A8 RD CS8XXX EXTD0 EXTD1 EXTD2 EXTD3 EXTD4 EXTD5 EXTD6 EXTD7 CSAXXX A0 A2 EXTD0 EXTD2 EXTD4 VDD U6 20 GND 10 VDD C9 0.1F EXTD6 PA0/IN3 PA2/IN1 VDD PA4/OUT4 PA6/OUT2 MISO R6A 10k 2 VDD R6E 10k VDD 6 R6B 10k XIRQ SCK E J1-7 J1-9 J1-11 J1-13 J1-15 J1-17 J1-19 J1-21 J1-23 J1-25 J1-27 J1-29 J1-31 J1-33 J1-35 J1-37 J1-39 J1-8 J1-10 J1-12 J1-14 J1-16 J1-18 J1-20 J1-22 J1-24 J1-26 J1-28 J1-30 J1-32 J1-34 J1-36 J1-38 J1-40 VDD WR CS9XXX CSBXXX A1 A3 EXTD1 EXTD3 EXTD5 EXTD7 PA1/IN2 PA3/IN4/OUT5 PA5/OUT3 PA7/OUT1/PULSE ACCIN MOSI RESERVED SS 7 R6F 10k SS 3 IRQ 8 VDD R6G 10k GND GND VPREREG J1-1 J1-3 J1-5 J1-2 J1-4 J1-6 GND GND VPREREG 74HCT245 18 B1 B2 B3 B4 B5 B6 B7 B8 17 16 15 14 13 12 11 R6H 10k 9 R6C 10k 4 JU1 MODA MODA MODB JU2 R6I 10k 10 R6D 10k 5 MODB Figure 1. 68L11D Module Schematic Diagram (continued) 6 _______________________________________________________________________________________ 68L11D Module 68L11D Module Figure 2. 68L11D Module Component Placement Guide Figure 3. 68L11D Module PC Board Layout--Component Side _______________________________________________________________________________________ 7 68L11D Module 68L11D Module Figure 4. 68L11D Module 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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