19-0313; Rev. 0; 9/94 MAX187 Evaluation System/Evaluation Kit ___________________________Features ♦ Evaluates MAX187 and MAX189 The EV system can function as a data acquisition system, collecting samples from the MAX187, storing them in memory, and displaying the conversion results on the host computer. Conversions may be self-timed or synchronized to an external timebase. Waveforms can be digitized and displayed graphically versus time. ♦ QSPI Serial Interface The EV system can also evaluate the MAX187’s shutdown feature, and has provisions for monitoring the supply current in the various modes of operation (internal reference, external reference, or power-down). ♦ Proven PC Board Layout Order the EV system (MAX187EVC16-DIP) for comprehensive evaluation of the MAX187 or MAX189. Order the standalone EV kit (MAX187EV KIT-DIP) for custom use or if the 68HC16 module (68HC16MODULE-DIP) has already been purchased with another Maxim EV system. The MAX187 EV kit can also be used to perform limited evaluation on a stand-alone basis (see the MAX187 EV Kit Quick Start section). The EV system requires an external DC power source (such as a 12V DC wall transformer) and an IBM-compatible computer with a serial port and a 5 1/4" disk drive. To evaluate the MAX189, order the MAX187EVC16-DIP plus a free sample of the MAX189BCPA. ♦ Fully Assembled and Tested ♦ Complete Evaluation System Includes EV Kit and 68HC16 µC Module ♦ 12-Bit Resolution ADC ♦ 0V to 4.096V Input Range ♦ Internal Reference Voltage (MAX187) ♦ Low-Supply-Current Shutdown Mode ♦ Complete Source Code Provided ♦ Convenient Test Points Provided on Board ♦ User Prototype Area ______________Ordering Information TEMP. RANGE BOARD TYPE MAX187EVC16-DIP PART 0°C to +70°C Through-Hole MAX187EVKIT-DIP 0°C to +70°C Through-Hole 68HC16MODULE-DIP 0°C to +70°C Through-Hole ___________________________________________________________________EV System ™QSPI is a trademark of Motorola Corp. ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 Evaluates: MAX187 _______________General Description The MAX187 evaluation system (EV system) consists of a MAX187 evaluation kit (EV kit) board plus a Maxim 68HC16 microcontroller (µC) module. Both boards come fully assembled and tested, and software is provided. The unit connects to an IBM-compatible personal computer. Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit _______EV System Component List QTY 1 1 DESCRIPTION MAX187 evaluation kit (MAX187EVKIT-DIP) 68HC16 µC module (68HC16MODULE-DIP) __MAX187 EV System Quick Start This section applies only to the use of the MAX187 EV kit operating with Maxim’s 68HC16 module. 1) Copy the files from the distribution disk to your hard drive or to blank floppy disks. Store the MAX187 EV kit software in its own directory to prevent conflicts with other Maxim EV kit files. The necessary files are in the root directory of the distribution disk, and ancillary files are located in the SOURCE and TMS320 subdirectories. These subdirectories are not required for EV kit operation, and are described in other sections of this manual. 2) Carefully connect the boards by aligning the 40-pin header of the MAX187 EV kit with the 40-pin connector of the 68HC16 µC module and gently press them together. The two boards should be flush against one another. 3) Use a small flat-blade screwdriver to connect a 9V to 15V DC power source to the µC module. The terminal block is located next to the on/off switch, in the upper right corner of the module. Observe the polarity marked on the board. 4) Connect a cable from the computer’s serial port to the µC module. If using a 9-pin serial port, use a straight-through 9-pin female-to-male cable. If the serial port uses a 25-pin connector, a standard 25pin to 9-pin adapter will be required. 5) Start up the MAX187 software on the IBM PC by setting the current directory to match the directory containing the Maxim programs, and then type the program name “MAX187”. 6) The program allows the user to select which serial port is connected to the µC module. Press the space bar until the correct port is highlighted, then press ENTER. 7) The MAX187 program will switch to terminal-emulation mode. At this point, apply power to the 68HC16 module. The LED should light, and within 5 seconds 2 ____________EV Kit Component List DESIGNATION C1 C2, C3 J1 J4 JU1 R1 U1 None None None QTY 1 2 1 1 1 1 1 4 1 1 DESCRIPTION 0.1µF ceramic capacitor 4.7µF electrolytic capacitors Female 40-pin data connector 6-pin header 3-pin header 10kΩ resistor Maxim MAX187ACPA Rubber feet 8-pin socket for U1 MAX187 printed circuit board the program will display a logon banner. The LED is a status indicator, not a power indicator; it will flash to indicate module readiness. Refer to the 68HC16 module self-check system. 8) To download and run the RAM resident code on the µC module, press ALT+L (i.e. hold down the ALT key and strike the L key). The program prompts for the file name. Press the ENTER key to download and run the file KIT187.S19 on the 68HC16 module. 9) The KIT187.S19 RAM resident program offers a menu of commands, listed in Table 1. Stand-Alone MAX187 EV Kit _________________________Quick Start This section applies only to the use of the MAX187 EV kit without the µC module. 1) Connect a regulated 5V DC power supply to the terminals labeled POS5 and GND. The GND pad is ground, and the POS5 pad is the 5V input. The board draws less than 5mA of supply current. 2) To enable the MAX187’s internal reference, connect the SHDN pin to 5V. To use an external reference, leave the SHDN pin open and provide a reference voltage at the VREF pad. To put the MAX187 in shutdown mode, connect the SHDN pin to ground. 3) Connect the interface signals to the CS, SCK, and DOUT test points. Use the AGND test point as signal ground. See the MAX187 data sheet for timing information. 4) Apply the input voltage to the terminals labeled INPUT and GND. _______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit EPROM Resident Program A small bootstrap program is stored in the EPROM located on the 68HC16 board. The EPROM resident program initializes the 68HC16, tests the static RAM, configures the chip-select logic, establishes serial communications with the host, and downloads a program into RAM. It starts operating on power-up or whenever the RESET button is pressed. After RESET, it tests the RAM and then waits to receive a character on its serial port before transmitting its identification banner. RAM Resident Program KIT187.S19 and MIN187.S19 are 68HC16 RAM-resident programs that are transferred from disk to the static RAM on the 68HC16 module. They are used transparently by the example programs. The example programs that do not require the full command set of KIT187 download the MIN187 program, which is smaller and implements only the read and collect commands. Because the MIN187 occupies less user RAM, more sample data can be collected (MIN187 can collect approximately 400 more samples than KIT187 before it must upload the samples to the host.) When the KIT187 program is running, it offers the commands listed in Table 1. The MIN187 program commands are listed in Table 2. Table 1. Commands Available when KIT187.S19 is Running KEY Space FUNCTION Read the MAX187 and print result in decimal. V Repeatedly read the MAX187 and print result in decimal. R Read the MAX187 and print result in hexadecimal. O Oscilloscope test; observe system timing by operating the MAX187 at high speed without processing the data. S Set the state of the SHDN pin. L Display low-power menu. D Set power-up delay and sleep time (low-power menu only). T Test the accuracy using the current power-up delay and sleep time settings (low-power menu only). M Return to main menu (low-power menu only). ? List the available commands. Personal Computer Program MAX187.EXE, which runs on an IBM-compatible computer, is a terminal program that establishes communication with the 68HC16 module and allows the user to download and run a Maxim-provided RAM resident program. The serial communication baud rate is initiated at 1200 baud to ensure proper operation with slower systems. The MAX187.EXE program provides several commands that are associated with the host computer. These functions are listed in Table 3. The MAX187.EXE program can store the text of a terminal session in a log file. To begin recording the terminal session, press ALT+O [the letter O]. The program will ask for a file name. Press ENTER to accept the default file name, or type in a different name. If there is already a file with that name, the old file will be erased. To close the file, press ALT+C. The log file will contain the complete text of the terminal session from the time when the file is opened until the file is closed. Graphing Program The program SAMPL187.BAS samples the MAX187 and draws a graph of voltage over time. Preset sample rates range from 2.5ksps to 10ksps. The time base is approximate and there is no triggering mechanism, so this program is only suitable for observing the waveforms of an external frequency generator. Table 2. Commands Available after MIN187 has been Downloaded KEY FUNCTION ? Print RAM resident program version and list of commands available. r Read the MAX187 and display the value as a 2-byte hexadecimal number. c Collect and upload a number of data samples to the host PC. Samples can be collected at full speed, or collected with a fixed delay, or collected in accordance with an external clock. Approximately 16,000 samples may be collected and they can be displayed in either decimal or in hexadecimal. ESC Exit the evaluation software. _______________________________________________________________________________________ 3 Evaluates: MAX187 ________________Detailed Description __________________________of Software Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Table 3. Commands Available in MAX187.EXE Terminal Program KEY FUNCTION 68HC16 I/O ALT+L Load and run resident code on 68HC16. ALT+X Exit to DOS. ALT+P Change port (COM1, COM2). PCS0 MAX187 SHDN CS SCK SCLK MISO DOUT ALT+R Send RESET command to 68HC16. ALT+O Open a log file. ALT+C Close the log file. ALT+B Display baud rate menu. ALT+1 1200 baud Programming Languages Used ALT+4 4800 baud ALT+9 9600 baud ALT+2 19200 baud The IBM PC programs were compiled under Borland C++ version 3.1. The EPROM and RAM resident 68HC16 programs were assembled using the Motorola 68HC macro assembler version 4.1, which comes with Motorola’s 68HC16Z1EVB evaluation board. Contact the Motorola Microprocessor and Memory Technologies Group at (512) 891-2628. Figure 1. QSPI Interface Schematic Table 4. Compiled Program Dependencies PROGRAM SIMPLE.EXE PROGRAM SECTION SOURCE FILES main program simple.c 68HC16 command interface sercmd.c, sercmd.h MAX187 EV kit commands max187.c, max187.h main program shell.cpp, global.h custom controls meters.cpp, meters.hpp MAX187.EXE terminal + downloader download.cpp, download.h 68HC16 command sercmd.c, sercmd.h interface MAX187 EV kit commands max187.c, max187.h DOS Development Platform For applications that require custom software, the MAX187 EV kit includes a set of programs that can be used as a development platform to extend the functionality of the basic kit. Source code is in the SOURCE subdirectory of the MAX187 EV kit disk. Advanced C or C++ programmers should see Table 4 for the makefile dependencies. The simplest program that accesses the MAX187 EV kit is SIMPLE.EXE, which loads the small RAM resident program into the 68HC16 module and then performs continuous conversions, until the user presses a key. To run the SIMPLE.EXE program, enter the command SIMPLE from the DOS prompt. The program will ask which serial port is connected to the µC module. Press the ‘1’ number key to select COM1, or press the ‘2’ number key to select COM2. To terminate the program, press the ESC key. 4 The BASIC programs are written in Mircosoft QuickBasic 1.0, which comes with MS-DOS 5.0 and later versions. Using the QSPI to Read the MAX187 The 68HC16 module uses its queued serial peripheral interface (QSPI) in master mode to read the MAX187 between conversions. Figure 1 shows the schematic of the QSPI interface connections. The MAX187 EV kit software uses the following algorithm (provided on disk in the SOURCE subdirectory, file MIN187.ASM): 1) Initialize QSPI parameters as follows: Master Mode SPBR = 2 (4.192MHz serial clock) CPOL = 0, CPHA = 1 BITS = 13 bits per transfer DTL = 1 (1.9µs delay after transfer) (DSCKL is not used) Control RAM entry must enable BITS and DTL; CS = 0 when active. 2) Assert CS low. 3) Wait 8.5µs (maximum conversion time for the MAX187) or until MISO goes high. (Since DSCKL is only 7 bits, the maximum delay-before-clock available for a 16.78MHz 68HC16 is 128/16.78MHz = 7.628µs. Thus, the QSPI’s DSCKL parameter cannot be used unless the system clock frequency is reduced.) 4) Start QSPI transfer. 5) Wait until QSPI transfer is complete. _______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187 Listing 1. Using the QSPI to Read the MAX187 _______________________________________________________________________________________ 5 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit CS (PCS0) 2 5 SCLK (SCK) 4 3 1 DOUT (MISO) START BIT 1 2 3 4 5 D11 D10 D9 D0 QSPI READ CONVERSION TIME – MAX187: 8.5µs MAX DELAY BEORE QSPI CLOCK: DSCKL (8.5µs) (16.78MHz) = 143 (BUT DSCKL MUST BE LESS THAN 128, SO IT CANNOT BE USED UNLESS THE SYSTEM CLOCK SPEED IS REDUCED) MAX187 SCK TO DOUT DELAY: 150ns MAX QSPI SETUP TIME: 30ns MIN SCK PERIOD: 30ns + 150ns = 180ns MIN 1 MAX FREQUENCY = = 5.56MHz MAX 180ns SPBR = 2 SETS BAUD RATE TO 16.78MHz = 4.195MHz 2x2 1 ACTUAL SCK PERIOD = = 238ns 4.195MHz Figure 2. MAX187 to QSPI Interface Timing (CPOL = 0, CHPA = 1) 6) Set CS high. 7) Extract the 12 significant bits from the read queue. The data is right-justified. Figure 2 is the timing diagram for the QSPI interface. Listing 1 is an assembly-code listing that shows how to use the QSPI to read the MAX187. Using Bit-Pushing to Read the MAX187 The QSPI is not required by the MAX187. The MAX187 may be read by any equivalent bit-pushing algorithm. The following algorithm reads the MAX187 by setting and clearing I/O bits, and is functionally equivalent to the QSPI. 1) Assert SCK low. 2) Assert CS low. 3) Clear a 16-bit register that will be used to store the reading. 4) Wait until DOUT becomes high. 5) Set SCK high. 6) Assert SCK low. 7) Repeat 12 times: 7.1) Set SCK high. 7.2) Rotate the 16-bit reading register left one bit (i.e. multiply by two). 6 7.3) Read DOUT into least significant bit of reading register. 7.4) Clear SCK low. 8) Set CS high. 9) Extract the 12 significant bits from the 16-bit result register. The data is right-justified. ____________Evaluating the MAX189 The MAX187 EV kit supports both the MAX187 and MAX189 ICs. The only difference between the two devices is that the MAX189 requires an external reference. Refer to the MAX187/MAX189 data sheet for the MAX189 reference requirements. Detailed Description ________________________of Hardware MAX187 ADC The central component of the evaluation board is the MAX187 analog-to-digital converter (ADC). Capacitor C1 is close to pin 1, C3 is close to pin 4, and analog ground is star grounded at pin 5. DC offset error may be improved by adding a 0.1µF capacitor between INPUT and AGND. _______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit PIN No. 68HC16 SIGNAL MAX187 SIGNAL 1–4 GND AGND Ground FUNCTION 7–8 +5V +5V +5V Supply to MAX187 Evaluation Board 30 OC1 SHDN Shutdown Pin 35 MISO DOUT Serial Data Output from MAX187 37 SCK SCLK Serial Clock from 68HC16 38 PSC0 CS Chip Select from 68HC16 Table 6. 68HC11/SPI Interface Connections SPI SIGNAL MAX187 SIGNAL SPARE I/O SHDN SPARE OUTPUT CS MISO DOUT Serial Data Output from MAX187 SCK SCLK Serial Clock from 68HC11 SS — FUNCTION Shutdown Pin Chip Select from 68HC11 Slave Select Input to 68HC11; must be pulled up to 5V. All other pins are reserved. Measuring Supply Current To measure the amount of supply current drawn by the MAX187, use the following procedure: 1) Turn off the power to the EV system. 2) Carefully cut the trace at J2. 3) Install a 2-pin header at J2. 4) Connect a current meter in series with J2. The direction of current flow is marked with an arrow. Do not connect or disconnect the current meter while the power is on. After observing supply current in operating and in shutdown modes, the board may be restored by installing a shunt at J2. Data-Connector Interface The 68HC16 and MAX187 communicate through the QSPI port on the 40-pin data connector. Table 5 lists the function of each bit when interfaced to the 68HC16 module. Figure 1b shows the QSPI interface schematic diagram. _______________________SPI Interface A 68HC11 can use its SPI™ (serial peripheral interface) to read a MAX187. Table 6 lists the interface connections required by the SPI serial interface. Figure 2 is a schematic diagram of the SPI interface. Listing 2 shows how to use the SPI to read the MAX187. The algorithm is as follows: 1) Initialize SPI parameters: Master Mode SPR = 00 (1MHz serial clock) CPOL = 0, CPHA = 0 2) Assert CS low. 3) Wait until MISO goes high. 4) Begin SPI transfer. 5) Wait until SPI transfer is complete. 6) Save the first 8 bits in temporary storage. This first SPI byte contains the start bit followed by MAX187 data bits 11–5. 7) Continue the SPI transfer. 8) Wait until SPI transfer is complete. 9) Negate CS high. 10) Extract the 12 significant bits from the 16 bits that the SPI read. The second SPI byte contains MAX187 data bits 4–0 followed by three zero bits. ™SPI is a trademark of Motorola Corp. _______________________________________________________________________________________ 7 Evaluates: MAX187 Table 5. Data-Interface Connections for 68HC16 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Listing 2. Using the SPI to Read the MAX187 8 _______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit MAX187 I/O SHDN I/O The demo software configures the TMS320C30 so that FSR1 and DR1 are inputs, and CLKR1 and XF1 are outputs. The software uses the XF1 output to start a conversion. The XF1 pulse drives the MAX187 chip-select input. The CLKR1 output provides the serial clock to the MAX187. Data output from the MAX187 is received on the DR1 input. The FSR1 frame-start signal is also tied to the data output, so the start bit from the MAX187 marks the beginning of the serial frame. CS +5V 10k SS SCK SCLK MISO DOUT Figure 3. SPI Interface Schematic To read the MAX187, the software drives the XF1 output low, then waits 8.5µs (the maximum conversion time). It then enables the serial receive clock. The MAX187 sends its start bit, followed by the serial data. The demo software polls the serial receiver until a complete frame has been received. Since only 12 of the 16 bits received are significant, the demo software rightjustifies the significant bits and removes the start bit, then writes the 12-bit word to the TMS320C3XEVM’s host data port. __________________TMS320 Interface The TMS320 subdirectory of the program disk contains a demonstration program that interfaces the MAX187 to Texas Instruments’ TMS320C3X Evaluation Module (EVM), as shown in Figure 3. This demonstration requires the additional software included with the TMS320C3X EVM board, and is provided for the convenience of programmers who are already familiar with Texas Instruments’ TMS320 family of digital signal processors. To connect the MAX187 EV kit to the For the complete ribbon-cable pinout, consult the TMS320C3X Evaluation Module Technical Reference that came with your TMS320C3X EVM. CS 5 SCLK (SCK) 2 3 4 1 DOUT (MISO) START BIT D11 1 MAX187 CONVERSION TIME: 8.5µs MAX 2 SPI SETUP TIME: 100ns MIN 3 SPI HOLD TIME: 100ns MIN 4 MAX187 SCK TO DOUT DELAY: 150ns MAX 5 SCLK PERIOD: (150ns + 100ns) (2) = 500ns ACTUAL PERIOD = 1 = 1000ns 1MHz D10 NOTE: TIMING DIAGRAM NOT DRAWN TO SCALE Figure 4. MAX187 to SPI Interface Timing (CPOL = 0, CPHA = 0) _______________________________________________________________________________________ 9 Evaluates: MAX187 68HC11 TMS320C3X EVM, install a 2 x 5 pin ribbon-cable header in the prototype area and wire it in accordance with Table 7. The SHDN pin should be tied to 5V for normal operation. Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Table 7. TMS320C3X EVM Interface Connections TMS320C30 TMS320C30 SIGNAL TMS320C3X EVM CONNECTOR PIN No. MAX187 SIGNAL GND 1 AGND Signal Ground DR 4 DOUT Data Received from MAX187 XF1 8 CS Active-Low Chip Select to MAX187 FSR 2 DOUT Frame-Start Input to TMS320 CLKR 9 SCLK Serial Clock to MAX187 GND 10 AGND Signal Ground MAX187 FSR DR DOUT CLKR SCLK XF1 CS Figure 5. TMS320 Interface Schematic FUNCTION Note: TMS320 FSR and DR both connected to MAX187 DOUT. CS (XF1) 8 3 4 n+3 15 SCLK (CLKR) 0 2 1 DOUT (FSR, DR) 6 5 7 Dn 1 CS LOW TO DOUT ENABLE: 100ns MAX 2 ACTUAL CONVERSION TIME: 8.5µs MAX 3 DELAY BEFORE CLKR: 8.5µs MIN 4 CLKR CYCLE TIME: 267ns 5 SCLK TO DOUT DELAY: 150ns MAX 6 SETUP TIME FOR DR: 31ns MIN 7 CS TO DOUT DISABLE: 100ns MAX 8 DELAY BETWEEN CONVERSIONS: 500ns MIN NOTE: TIMING DIAGRAM NOT DRAWN TO SCALE Figure 6. MAX187 to TMS320 Interface Timing 10 ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187 Listing 3. Using the TMS320C3X EVM to Read the MAX187 ______________________________________________________________________________________ 11 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit +5V 1 +5V POS 5 2 SHDN J2 3 SCLK J4 TEST POINTS C1 0.1µF 4 CS C2 4.7µF 5 DOUT 6 AGND J3 1 INPUT 2 VDD SCLK +5V CS 7 JU1 3 SHDN DOUT 6 +5V VREF 4 REF J1-37 SCLK J1-38 PCSO/SS J1-31 OC2 J1-35 MISO J1-1..4 GND J1-7..8 +5V 2 1 3 OC1 R1 10kΩ MAX187 AIN 8 J1-30 GND 5 C3 4.7µF GND *NOTE: C1, C2, C3 STAR GROUND AT MAX187 PIN 5 Figure 7. MAX186 EV Kit Component-Side Layout 12 ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187 Figure 8. MAX187 EV Kit Component Placement Guide ______________________________________________________________________________________ 13 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Figure 9. MAX187 EV Kit PC Board Layout—Component Side 14 ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187 Figure 10. MAX187 EV Kit PC Board Layout—Solder Side ______________________________________________________________________________________ 15 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit _____________________________________________68HC16 Module Component List DESIGNATION C1, C2, C3 QTY 3 C4, C5 2 C6, C7 C8 C9 C10–C14 D1 J1 J2 2 1 0 5 1 1 1 J3 1 J4 JU1 JU2 JU3 JU4 JU5 L1 L2 LED1 R1 0 0 0 0 0 0 0 0 1 1 DESCRIPTION 1µF ceramic capacitors 22µF, 25V radial-lead electrolytic capacitors 22pF capacitors 0.01µF capacitor Reference designator, not used 0.1µF capacitors 1N4001 diode 40-pin right-angle male connector 2-circuit terminal block Right-angle printed circuit board mount, DB9 female socket Empty Empty Reference designator, not used Empty Empty Empty Empty Empty Light-emitting diode 10MΩ, 5% resistor DESIGNATION R2 R3, R4 R5 R6 SW1 SW2 QTY 1 2 1 1 1 1 DESCRIPTION 330kΩ, 5% resistor 10kΩ, 5% resistor 470Ω, 5% resistor 10kΩ SIP resistor Slide switch Momentary pushbutton switch U1 1 68HC16 µC, part # MC68HC16Z1CFC16 (132-pin plastic quad flat pack) U2 1 Maxim MAX233CPP U3 1 27C256 EPROM containing monitor program U4 U5 U6 U7 Y1 None None None None None 1 1 1 1 1 4 1 1 1 1 7805 regulator, TO-220 size 62256 (32K x 8) static RAM 74HCT245 bidirectional buffer Maxim MAX707CPA 32.768kHz watch crystal Rubber feet 28-pin socket for U3 20-pin socket for U6 3" x 5" printed circuit board Heatsink for U4, thermalloy # 6078 68HC16 Module ________________General Description 68HC16 Module ________________Detailed Description The 68HC16 module is an assembled and tested printed-circuit board intended for use with Maxim’s highspeed serial-interface evaluation kits (EV kits). The module uses an inexpensive 8-bit implementation of Motorola’s MC68HC16Z1 microcontroller (µC) to collect data samples at high speed using the QSPI™ interface. It requires an IBM-compatible personal computer and an external DC power supply, typically 12V DC or as specified in EV kit manual. The 68HC16 module draws its power from a user-supplied power source connected to terminal block J2. Be sure to note the positive and negative markings on the board. A three-terminal 5V regulator allows input voltages between 8V and an absolute maximum of 20V. The 68HC16 module typically requires 200mA of input current. Maxim’s 68HC16 module is provided to allow customers to evaluate selected Maxim products. It is not intended to be used as a microprocessor development platform, and such use is not supported by Maxim. Power Input Connector J2 68HC16 Microcontroller U1 is Motorola’s 68HC16Z1 µC. Contact Motorola for µC information, development, and support. Maxim EV kits use the high-speed queued serial peripheral interface (QSPI) and the internal chip-select generation. A MAX707 on the module monitors the 5V logic supply, generates the power-on reset, and produces a reset pulse whenever the reset button is pressed. ™ QSPI is a trademark of Motorola Corp. 16 ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit U5, the user RAM area, is a 32kbyte CMOS static RAM. The 74HCT245 octal buffer lets the 68HC16 module access an 8-bit port on the 40-pin interface connector. This memory-mapped port consists of separate read and write strobes, four chip selects, four address LSBs, and eight data bits. Table 8. Serial Communications Port J3 PIN NAME FUNCTION 1 DCD Handshake; hard-wired to DTR and DSR 2 RXD RS-232-compatible data output from 68HC16 module 3 TXD RS-232-compatible data input to 68HC16 module 4 DTR Handshake; hard-wired to DCD and DSR 5 GND Signal ground connection 6 DSR Handshake; hard-wired to DCD and DTR 7 RTS Handshake; hard-wired to CTS 8 CTS Handshake; hard-wired to RTS 9 None Unused Serial Communications J3 is an RS-232 serial port, designed to be compatible with the IBM PC 9-pin serial port. Use a straightthrough DB9 male-to-female cable to connect J3 to this port. If the only available serial port has a 25-pin connector, you may use a standard 25-pin to 9-pin adapter. Table 8 shows the pinout of J3. The MAX233 is an RS-232 interface voltage level shifter with two transmitters and two receivers. It includes a built-in charge pump with internal capacitors that generates the output voltages necessary to drive RS-232 lines. 40-Pin Data Connector J1 The 20 x 2 pin header connects the 68HC16 module to a Maxim EV kit. Table 9 lists the function of each pin. Note that 68HC16 object code is not compatible with 68HC11 object code. Use the 68HC16 module only with those modules that are designed to support it, and only download code that is targeted for the 68HC16 module. Downloading incorrect object code into the 68HC16 module will have unpredictable results. Address Ranges The 68HC16 µC generates various enable signals for different address ranges. The ROM and RAM enable signals are fed directly to the respective chips. Several additional signals (J1.11–J1.14) are available on the data connector to be used by Maxim EV kits. Table 10 outlines the address ranges for each of the elements found on the 68HC16 module, and Table 11 is a truth table that describes the logic for each of the 68HC16’s chip-select outputs. Because the addresses are not completely decoded, the boot ROM and user RAM have shadows. Table 9. 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 VPREREG VCC RD WR 7E000 7E800 7F000 7F800 A00 A01 A02 A03 EXTD0 EXTD1–7 IC1 IC2 IC3 OC1 OC2 OC3 OC4 IC4 MISO MOSI SCK PCS0/SS CLKOUT PWMA FUNCTION Ground Unregulated input voltage +5V from on-board regulator Read strobe Write strobe Chip select for 7E000–7E7FF Chip select for 7E800–7EFFF Chip select for 7F000–7F7FF Chip select for 7F800–7FFFF Address bit 0 (LSB) Address bit 1 Address bit 2 Address bit 3 Buffered data bus 0 (LSB) Buffered data bus bits 1–7 General I/O port bit 0 (LSB) General I/O port bit 1 General I/O port bit 2 General I/O port bit 3 General I/O port bit 4 General I/O port bit 5 General I/O port bit 6 General I/O port bit 7 QSPI master-in, slave-out QSPI master-out, slave-in QSPI serial clock QSPI chip-select output System clock output Pulse-width-modulator output ______________________________________________________________________________________ 17 Evaluates: MAX187 The 68HC16 uses a phase-locked loop (PLL) to set its bus speed. Crystal Y1 is a 32.768kHz frequency reference. The internal oscillator runs 256 times faster than the external crystal. When the 68HC16 is reset, it waits for the PLL to lock before it executes any software. After the PLL locks onto the reference frequency, the software doubles the clock speed by writing to the clock synthesizer control register, selecting a bus speed of 16.78MHz. Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Table 10. 68HC16 Module Memory Map (all address values are in 20-bit hex) PIN FUNCTION Boot ROM The boot ROM, U3, is configured as an 8-bit memory device. Resistor R4 pulls data bit 0 low during system reset, forcing the µC to fetch instructions using only the upper eight data bits. The boot ROM checks the system and waits for commands from the host. Refer to the EV kit manual for specific start-up procedures. 00000–07FFF Boot ROM (U3, strobed by CSBOOT) 08000–0FFFF Shadow of boot ROM 10000–17FFF User RAM (U5, strobed by CS0 and CS2) 18000–1FFFF Shadow of user RAM 20000–203FF Internal standby RAM; 1kbyte 20400–7DFFF Unused 7E000–7E7FF External chip select (J1 pin 11) (CS7) 7E800–7EFFF External chip select (J1 pin 12) (CS8) 7F000–7F7FF External chip select (J1 pin 13) (CS9) _______68HC16 Module Self Check 7F800–7FFFF External chip select (J1 pin 14) (CS10) 80000–F7FFF Not accessed by the 68HC16 F8000–FF6FF Unused FF700–FF73F 68HC16’s built-in ADC (not used) FF740–FF8FF Unused To test the 68HC16 module’s integrity, connect the power supply to the power terminals (J2). Do not connect anything to J1 or J3. Slide the power switch SW1 to the “ON” position. The LED will light up, and will flash within 5 seconds. FF900–FF93F General-purpose timer module (GPT) FF940–FF9FF Unused FFA00–FFA7F System integration module (SIM) FFA80–FFAFF Unused FFB00–FFB07 Internal standby RAM (SRAM) control registers FFB08–FFBFF Unused FFC00–FFDFF Queued serial module (QSM) FFE00–FFFFF Unused 18 Software All software is supplied on a disk with the EV kit. Instructions for operating the software are included in the EV kit manual. Refer to the EV kit manual for more information. If the LED flashes with a 50%-on/50%-off duty cycle, then it passed its self check. Note that this test does not exercise the RS-232 port or the EV kit 40-pin interface, but it does confirm that the power supply, microprocessor, ROM, and RAM passed the self test. If the LED flashes with a 10%-on/90%-off duty cycle, then it failed its self check. Most likely, the RAM chip (U5) is bad. If the LED remains on and does not flash, then the problem is either U3 (the EPROM), U1 (the microprocessor), U4 (the regulator), the MAX707 reset generator, or the power supply. Use a voltmeter to verify that the power supplies are good. Check the power-supply input and the +5V output from the regulator. Use an oscilloscope to see if the 32.768kHz reference oscillator is running. ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit ADDRESS RANGE CSBOOT CS0 CS1 CS2 CS5 CS6 CS7 CS8 CS9 CS10 0xxxx read L H H H H H H H H H 1xxxx read H H H L H H H H H H 1xxxx write H L H H H H H H H H 7E0xx read H H L H H L L H H H 7E0xx write H H H H L L L H H H 7E8xx read H H L H H L H L H H 7E8xx write H H H H L L H L H H 7F0xx read H H L H H L H H L H 7F0xx write H H H H L L H H L H 7F8xx read H H L H H L H H H L 7F8xx write H H H H L L H H H L VCC LED1 R5 470Ω GROUND PWMB C13 0.1µF VCC UNREGULATED 7V TO 20V REGULATED +5V INTEL COMPATIBLE READ/WRITE STROBES GND CHIP SELECTS 19 CS6/IOBUFFER CS1/RDIO OE 1 DIR 2 3 4 5 6 7 8 9 D08 D09 D10 D11 D12 D13 D14 D15 LOW ADDRESS BITS U6 74HCT245 B1 B2 B3 B4 B5 B6 B7 B8 A1 A2 A3 A4 A5 A6 A7 A8 18 17 16 15 14 13 12 11 EXTD0 EXTD1 EXTD2 EXTD3 EXTD4 EXTD5 EXTD6 EXTD7 8-BIT BUFFERED BIDIRECTIONAL DATA BUS 8-BIT GENERAL I/O PORT HIGH-SPEED SERIAL INTERFACE (QSM/QSPI) VCC 1 2 3 4 R6 10k SIP RESISTOR 5 6 7 8 9 10 GND GND VPREREG VCC CS1/RDIO CS7/7E000 CS9/7F000 A00 A02 EXTD0 EXTD2 EXTD4 EXTD6 IC1 IC3 OC2 OC4 MISO SCK CLKOUT J1-1 J1-3 J1-5 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 J1-2 J1-4 J1-6 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 GND GND VPREREG VCC CS5/WRIO CS8/7E800 CS10/7F800 A01 A03 EXTD1 EXTD3 EXTD5 EXTD7 IC2 OC1 OC3 IC4 MOSI PCSO/SS PWMA TSTME BKPT/DSCLK BKPT/DSCLK HALT DS J4-1 J4-2 BERR BERR GND J4-3 J4-4 BKPT/DSCLK MODCLK GND J4-5 J4-6 FREEZE DSACK1 RESET J4-7 J4-8 IPIPE1/DSI VCC J4-9 J4-10 IPIPE0/DS0 DSACK0 IRQ7 Figure 11. 68HC16 Module Schematic ______________________________________________________________________________________ 19 Evaluates: MAX187 Table 11. 68HC16 Chip-Select Outputs Truth Table Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit VSSE C14 0.1µF C8 0.01µF VCC BR FC2 FC1 VDDE VSSE FCO CSBOOT DATA0 DATA1 DATA2 DATA3 VSSI DATA4 DATA5 DATA6 DATA7 DATA8 DATA9 VDDE VSSE DATA10 DATA11 DATA12 DATA13 DATA14 DATA15 ADDRO DSACK0 DSACK1 AVEC DS AS VDDE U1 MOTOROLA MC68HC16Z1CFC16 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 CSO/WRRAM CS5/WRIO VCC VSSE CSBOOT/RDROM DOO VSSI DO8 DO9 VCC VSSE D10 D11 D12 D13 D14 D15 AOO DSACKO DSACK1 DS VCC 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 VSSE TXD ADDR1 ADDR2 VDDE VSSE ADDR3 ADDR4 ADDR5 ADDR6 ADDR7 ADDR8 VSSI ADDR9 ADDR10 ADDR11 ADDR12 ADDR13 ADDR14 ADDR15 ADDR16 ADDR17 ADDR18 VDDE VSSE VDDA VSSA ADA0 ADA1 ADA2 ADA3 ADA4 ADA5 VRH VRL ADA6 ADA7 VSTBY XTAL VDDSYN EXTAL VSSI VDDI XFC VDDE VSSE CLKOUT FREEZE/QUOT TSTME/TSC BKPT/DSCLK IPIPE0/DS0 IPIPE1/DS1 RESET HALT BERR IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 IRQ2 IRQ1 MODCLK R/W SIZ1 SIZ0 VSSE 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 A01 A02 VCC VSSE A03 A04 A05 A06 A07 A08 VSSI A09 A10 A11 A12 A13 A14 RXD PCS3 PCS2 PCS1 PCS0/SS SCK MOSI MISO VSSE VDDE IC1 IC2 IC3 OC1 OC2 VSSI VDDI OC3 OC4 IC4/OC5 PAI PWMA PWMB PCLK VSSE VDDE ADDR23 ADDR22 ADDR21 ADDR20 ADDR19 BGACK BG 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 RXD TXD VCC CS10/7F800 CS9/7F000 CS8/7E800 CS7/7E000 CS6/IOBUFFER CS2/RDRAM CS1/RDIO PWMA PWMB VSSE VCC IC1 IC2 IC3 OC1 OC2 VSSI VDDI OC3 OC4 IC4 MISO MOSI SCK PCSO/SS 1 C3 1µF 2 20V C10 0.1µF VSSE 2 MODCLK 1 L2 10µH OPTIONAL VSTBY XTAL 2 VCC VSSE CLKOUT FREEZE TSTME BKPT/DSCLK IPIPEO/DS0 IPIPE1/DSI RESET HALT BERR IRQ7 VCC 1 EXTAL VSSI VDDI JU4 VSSE VSSI Figure 11. 68HC16 Module Schematic (continued) 20 ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit 1 C7 22pF 1 VCC R2 330k 2 2 XTAL 1 2 1 1 TXD EXTAL C6 22pF J3-8 CTS 7 VCC R1 10M Y1 32.768kHz 2 Evaluates: MAX187 2 VCC GND J3-7 RTS 2 T1IN T1OUT 5 1 T2IN T2OUT 18 3 R1OUT J3-2 RXD 2 VCC SW2 RESET 1 1 2 – PFO 6 N.C. 8 RESET 4 7 RESET PFI GND 1 R1IN 4 20 R2OUT 5 2 J2 + RXD U7 MAX707 8 MR 13 12 RESET 17 3 14 R2IN 19 J3-3 TXD GND 11 C1+ C1VVV+ C2+ 15 C2+ 10 C216 C2- U2 MAX223 GND GND 9 6 J3-4 DTR J3-6 DSR J3-1 DCD SW1 POWER 1 2 1 J3-5 GND D1 1N4001 U4 78M05 IN OUT 1 VCC 3 VCC GND 2 2 1 C4 22µF 25V L1 10µH 1 1 2 1 C5 22µF 20V 2 JU5 2 2 C1 OPTIONAL 1µF 20V JU3 1 VSSE J3-9 RI VSSE GND VPREREG C2 1µF 20V 1 2 VDDI VSSI 2 D09 1 R3 10k 2 RESET 2 RESET GND CS2/RDRAM CS0/WRRAM 20 22 27 A0 A1 U5 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 11 12 13 15 16 17 18 19 D08 D09 D10 D11 D12 D13 D14 D15 VCC CS OE WE C12 0.1µF VCC CSBOOT/RDROM GND 2 A14 32k x 8-BIT HIGH-SPEED CMOS STATIC RAM A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 1 3 10 9 8 7 6 5 4 3 25 24 21 23 2 26 27 1 22 20 A0 A1 U3 A2 27C256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 11 12 13 15 16 17 18 19 A14 VPP OE CE D08 D09 D10 D11 D12 D13 D14 D15 D(00:15) R4 10k 10 9 8 7 6 5 4 3 25 24 21 23 2 26 1 A(00:18) 1 A(00:18) D00 A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 D(00:15) GND VCC C11 0.1µF GND VCC 32k x 8-BIT CMOS EPROM Figure 11. 68HC16 Module Schematic (continued) ______________________________________________________________________________________ 21 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Figure 12. 68HC16 Module Component Placement Guide 22 ______________________________________________________________________________________ MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187 Figure 13. 68HC16 Module PC Board Layout—Component Side ______________________________________________________________________________________ 23 Evaluates: MAX187 MAX187 Evaluation System/Evaluation Kit Figure 14. 68HC16 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. 24 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.