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19-0313; Rev. 0; 9/94
MAX187 Evaluation System/Evaluation Kit
_______________General Description
The MAX187 evaluation system (EV system) consists of a MAX187 evaluation kit (EV kit) board plus a Maxim 68HC16 microcontroller (C) module. Both boards come fully assembled and tested, and software is provided. The unit connects to an IBM-compatible personal computer. 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. 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). 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.
___________________________Features
o Evaluates MAX187 and MAX189 o Complete Evaluation System Includes EV Kit and 68HC16 C Module o 12-Bit Resolution ADC o QSPI Serial Interface o 0V to 4.096V Input Range o Internal Reference Voltage (MAX187) o Low-Supply-Current Shutdown Mode o Complete Source Code Provided o Proven PC Board Layout o Convenient Test Points Provided on Board o User Prototype Area o Fully Assembled and Tested
Evaluates: MAX187
______________Ordering Information
PART MAX187EVC16-DIP MAX187EVKIT-DIP 68HC16MODULE-DIP TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C BOARD TYPE Through-Hole Through-Hole Through-Hole
___________________________________________________________________EV System
TMQSPI is a trademark of Motorola Corp.
________________________________________________________________ Maxim Integrated Products
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Call toll free 1-800-998-8800 for free samples or literature.
MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
_______EV System Component List
QTY 1 1 DESCRIPTION MAX187 evaluation kit (MAX187EVKIT-DIP) 68HC16 C module (68HC16MODULE-DIP)
____________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 0.1F ceramic capacitor 4.7F electrolytic capacitors Female 40-pin data connector 6-pin header 3-pin header 10k resistor Maxim MAX187ACPA Rubber feet 8-pin socket for U1 MAX187 printed circuit board
__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 C 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 C 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 C 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 C 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
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 C 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 C 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.
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MAX187 Evaluation System/Evaluation Kit
________________Detailed Description __________________________of Software
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.
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.
Evaluates: MAX187
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.
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 1. Commands Available when KIT187.S19 is Running
KEY Space V R O S L D T M ? FUNCTION Read the MAX187 and print result in decimal. Repeatedly read the MAX187 and print result in decimal. Read the MAX187 and print result in hexadecimal. Oscilloscope test; observe system timing by operating the MAX187 at high speed without processing the data. Set the state of the SHDN pin. Display low-power menu. Set power-up delay and sleep time (low-power menu only). Test the accuracy using the current power-up delay and sleep time settings (low-power menu only). Return to main menu (low-power menu only). List the available commands.
Table 2. Commands Available after MIN187 has been Downloaded
KEY ? r FUNCTION Print RAM resident program version and list of commands available. Read the MAX187 and display the value as a 2-byte hexadecimal number. 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. Exit the evaluation software.
c
ESC
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Table 3. Commands Available in MAX187.EXE Terminal Program
KEY ALT+L ALT+X ALT+P ALT+R ALT+O ALT+C ALT+B ALT+1 ALT+4 ALT+9 ALT+2 Exit to DOS. Change port (COM1, COM2). Send RESET command to 68HC16. Open a log file. Close the log file. Display baud rate menu. 1200 baud 4800 baud 9600 baud 19200 baud FUNCTION Load and run resident code on 68HC16.
68HC16
I/O PCS0 SCK MISO
MAX187
SHDN CS SCLK DOUT
Figure 1. QSPI Interface Schematic
Programming Languages Used
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. The BASIC programs are written in Mircosoft QuickBasic 1.0, which comes with MS-DOS 5.0 and later versions.
Table 4. Compiled Program Dependencies
PROGRAM PROGRAM SECTION main program SIMPLE.EXE 68HC16 command interface MAX187 EV kit commands main program custom controls MAX187.EXE terminal + downloader SOURCE FILES simple.c sercmd.c, sercmd.h max187.c, max187.h shell.cpp, global.h meters.cpp, meters.hpp download.cpp, download.h
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 (1.9s 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 8.5s (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 = 7.628s. 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.
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 C 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.
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Listing 1. Using the QSPI to Read the MAX187
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
CS (PCS0) 2 SCLK (SCK) 4 1 DOUT (MISO) START BIT D11 D10 D9 D0 3
5
1 2 3 4 5
QSPI READ CONVERSION TIME - MAX187: 8.5s MAX DELAY BEORE QSPI CLOCK: DSCKL (8.5s) (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.
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.
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).
____________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 0.1F capacitor between INPUT and AGND.
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Table 5. Data-Interface Connections for 68HC16
PIN No. 1-4 7-8 30 35 37 38 68HC16 SIGNAL GND +5V OC1 MISO SCK PSC0 MAX187 SIGNAL AGND +5V SHDN DOUT SCLK CS Ground +5V Supply to MAX187 Evaluation Board Shutdown Pin Serial Data Output from MAX187 Serial Clock from 68HC16 Chip Select from 68HC16 FUNCTION
Table 6. 68HC11/SPI Interface Connections
SPI SIGNAL SPARE I/O SPARE OUTPUT MISO SCK SS MAX187 SIGNAL SHDN CS DOUT SCLK -- FUNCTION Shutdown Pin Chip Select from 68HC11 Serial Data Output from MAX187 Serial Clock 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.
_______________________SPI Interface
A 68HC11 can use its SPITM (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.
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.
TMSPI is a trademark of Motorola Corp. _______________________________________________________________________________________ 7
MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Listing 2. Using the SPI to Read the MAX187
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MAX187 Evaluation System/Evaluation Kit
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. 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. To read the MAX187, the software drives the XF1 output low, then waits 8.5s (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. For the complete ribbon-cable pinout, consult the TMS320C3X Evaluation Module Technical Reference that came with your TMS320C3X EVM.
Evaluates: MAX187
68HC11
I/O I/O +5V 10k SS SCK MISO
MAX187
SHDN CS
SCLK DOUT
Figure 3. SPI Interface Schematic
__________________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
CS
5 SCLK (SCK) 2 1 DOUT (MISO) 1 2 3 4 5 START BIT MAX187 CONVERSION TIME: 8.5s MAX SPI SETUP TIME: 100ns MIN SPI HOLD TIME: 100ns MIN MAX187 SCK TO DOUT DELAY: 150ns MAX SCLK PERIOD: (150ns + 100ns) (2) = 500ns ACTUAL PERIOD = 1 = 1000ns 1MHz NOTE: TIMING DIAGRAM NOT DRAWN TO SCALE D11 3 4 D10
Figure 4. MAX187 to SPI Interface Timing (CPOL = 0, CPHA = 0)
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Table 7. TMS320C3X EVM Interface Connections
TMS320C30
FSR DR CLKR XF1
MAX187
DOUT SCLK CS
TMS320C30 SIGNAL GND DR XF1
TMS320C3X EVM CONNECTOR PIN No. 1 4 8 2 9 10
MAX187 SIGNAL AGND DOUT CS DOUT SCLK AGND
FUNCTION Signal Ground Data Received from MAX187 Active-Low Chip Select to MAX187 Frame-Start Input to TMS320 Serial Clock to MAX187 Signal Ground
Figure 5. TMS320 Interface Schematic
FSR CLKR GND
Note: TMS320 FSR and DR both connected to MAX187 DOUT.
CS (XF1) 8 3 SCLK (CLKR) 2 DOUT (FSR, DR) 1 5 Dn 6 7 15 4 n+3 0
1 2 3 4 5 6 7 8
CS LOW TO DOUT ENABLE: 100ns MAX ACTUAL CONVERSION TIME: 8.5s MAX DELAY BEFORE CLKR: 8.5s MIN CLKR CYCLE TIME: 267ns SCLK TO DOUT DELAY: 150ns MAX SETUP TIME FOR DR: 31ns MIN CS TO DOUT DISABLE: 100ns MAX DELAY BETWEEN CONVERSIONS: 500ns MIN NOTE: TIMING DIAGRAM NOT DRAWN TO SCALE
Figure 6. MAX187 to TMS320 Interface Timing
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Listing 3. Using the TMS320C3X EVM to Read the MAX187
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
+5V POS 5 1 +5V
2 SHDN J2
3 SCLK J4 TEST POINTS
C1 0.1F
C2 4.7F
4 CS
5 DOUT
6 AGND J3 J1-30 OC1
1
VDD
SCLK
8 +5V
J1-37
SCLK
INPUT
2
MAX187
AIN CS
R1 10k 7 JU1 3 2 1 J1-31 J1-35 +5V J1-1..4 J1-7..8 OC2 MISO GND +5V J1-38 PCSO/SS
3
SHDN
DOUT
6
VREF
4 C3 4.7F
REF
GND
5
GND *NOTE: C1, C2, C3 STAR GROUND AT MAX187 PIN 5
Figure 7. MAX186 EV Kit Component-Side Layout
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Figure 8. MAX187 EV Kit Component Placement Guide
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Figure 9. MAX187 EV Kit PC Board Layout--Component Side
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Figure 10. MAX187 EV Kit PC Board Layout--Solder Side
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
_____________________________________________68HC16 Module Component List
DESIGNATION C1, C2, C3 C4, C5 C6, C7 C8 C9 C10-C14 D1 J1 J2 J3 J4 JU1 JU2 JU3 JU4 JU5 L1 L2 LED1 R1 QTY 3 2 2 1 0 5 1 1 1 1 0 0 0 0 0 0 0 0 1 1 DESCRIPTION 1F ceramic capacitors 22F, 25V radial-lead electrolytic capacitors 22pF capacitors 0.01F capacitor Reference designator, not used 0.1F 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 10M, 5% resistor DESIGNATION R2 R3, R4 R5 R6 SW1 SW2 U1 U2 U3 U4 U5 U6 U7 Y1 None None None None None QTY 1 2 1 1 1 1 1 1 1 1 1 1 1 1 4 1 1 1 1 DESCRIPTION 330k, 5% resistor 10k, 5% resistor 470, 5% resistor 10k SIP resistor Slide switch Momentary pushbutton switch 68HC16 C, part # MC68HC16Z1CFC16 (132-pin plastic quad flat pack) Maxim MAX233CPP 27C256 EPROM containing monitor program 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
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 (C) to collect data samples at high speed using the QSPITM interface. It requires an IBM-compatible personal computer and an external DC power supply, typically 12V DC or as specified in EV kit manual. 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.
68HC16 Module ________________Detailed Description
Power Input Connector J2
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.
68HC16 Microcontroller
U1 is Motorola's 68HC16Z1 C. Contact Motorola for C 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.
TM QSPI is a trademark of Motorola Corp.
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MAX187 Evaluation System/Evaluation Kit
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. 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.
Evaluates: MAX187
Table 8. 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 68HC16 module RS-232-compatible data input to 68HC16 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
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.
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
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 C 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.
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Table 10. 68HC16 Module Memory Map (all address values are in 20-bit hex)
PIN 00000-07FFF 08000-0FFFF 10000-17FFF 18000-1FFFF 20000-203FF 20400-7DFFF 7E000-7E7FF 7E800-7EFFF 7F000-7F7FF 7F800-7FFFF 80000-F7FFF F8000-FF6FF FF700-FF73F FF740-FF8FF FF900-FF93F FF940-FF9FF FFA00-FFA7F FFA80-FFAFF FFB00-FFB07 FFB08-FFBFF FFC00-FFDFF FFE00-FFFFF FUNCTION Boot ROM (U3, strobed by CSBOOT) Shadow of boot ROM User RAM (U5, strobed by CS0 and CS2) Shadow of user RAM Internal standby RAM; 1kbyte Unused External chip select (J1 pin 11) (CS7) External chip select (J1 pin 12) (CS8) External chip select (J1 pin 13) (CS9) External chip select (J1 pin 14) (CS10) Not accessed by the 68HC16 Unused 68HC16's built-in ADC (not used) Unused General-purpose timer module (GPT) Unused System integration module (SIM) Unused Internal standby RAM (SRAM) control registers Unused Queued serial module (QSM) Unused
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 C 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.
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.
_______68HC16 Module Self Check
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. 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.
18
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
Table 11. 68HC16 Chip-Select Outputs Truth Table
ADDRESS RANGE 0xxxx read 1xxxx read 1xxxx write 7E0xx read 7E0xx write 7E8xx read 7E8xx write 7F0xx read 7F0xx write 7F8xx read 7F8xx write CSBOOT L H H H H H H H H H H CS0 H H L H H H H H H H H CS1 H H H L H L H L H L H CS2 H L H H H H H H H H H CS5 H H H H L H L H L H L CS6 H H H L L L L L L L L CS7 H H H L L H H H H H H CS8 H H H H H L L H H H H CS9 H H H H H H H L L H H CS10 H H H H H H H H H L L
VCC
R5 470
LED1 PWMB
GROUND UNREGULATED 7V TO 20V REGULATED +5V INTEL COMPATIBLE READ/WRITE STROBES CHIP SELECTS LOW ADDRESS BITS
VCC
C13 0.1F GND
CS6/IOBUFFER CS1/RDIO D08 D09 D10 D11 D12 D13 D14 D15
19
OE 1 DIR
2 3 4 5 6 7 8 9
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
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 BERR MODCLK DSACK1 DSACK0 IRQ7 DS GND GND RESET VCC J4-1 J4-3 J4-5 J4-7 J4-9 J4-2 J4-4 J4-6 J4-8 J4-10 BERR BKPT/DSCLK FREEZE IPIPE1/DSI IPIPE0/DS0
R6 10k SIP RESISTOR
5 6 7 8 9 10
Figure 11. 68HC16 Module Schematic
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MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
C14 0.1F C8 0.01F MISO MOSI SCK PCSO/SS PWMA PWMB VSSE VCC IC1 IC2 IC3 OC1 OC2 VSSI VDDI OC3 OC4 IC4 VCC CS10/7F800 CS9/7F000 CS8/7E800 CS7/7E000 CS6/IOBUFFER CS2/RDRAM CS1/RDIO VSSE
A01 A02 VCC VSSE A03 A04 A05 A06 A07 A08 VSSI A09 A10 A11 A12 A13 A14
VCC
VSSE
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
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 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
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
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
U1 MOTOROLA MC68HC16Z1CFC16
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
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
JU4 VSSE VCC
1 2
XTAL
EXTAL VSSI VDDI
VCC VSSE CLKOUT FREEZE TSTME BKPT/DSCLK IPIPEO/DS0 IPIPE1/DSI RESET HALT BERR IRQ7
MODCLK
1
2 1
L2 10H OPTIONAL
C3 1F 2 20V VSSI
C10 0.1F
Figure 11. 68HC16 Module Schematic (continued)
20 ______________________________________________________________________________________
VSSE
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
VSTBY
MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
R2 330k VCC
2 2
2
1 1 2
1
C7 22pF
XTAL R1 10M
7
J3-8 CTS J3-7 RTS T1OUT 5 T2OUT 18 R1IN 4 R2IN 19 C2+ 15 C2+ 10 C216 C211
VCC TXD VCC GND
2 2
Y1 32.768kHz
1
T1IN T2IN R1OUT
2
1
C6 22pF
EXTAL
J3-2 RXD
1
VCC SW2 RESET
1 2 1
RXD
5
3
U7 MAX707
PFO 6 N.C. 8 RESET 4 7 RESET PFI GND MR
3
J3-3 TXD GND J3-4 DTR J3-6 DSR J3-1 DCD J3-5 GND
20 R2OUT 8 13
J2 + -
1 2
RESET
12 17 14
C1+ C1VVV+
U2 MAX223
GND
9
GND
6
SW1 POWER
1 2
D1 1N4001 VPREREG
2
JU5
1
GND L1 10H
VSSE
J3-9 RI
1 1 2
U4 78M05
IN OUT GND
2
3 1
VCC VCC
2
1 1 2
2 1 2
C1 OPTIONAL 1F 20V JU3
C2 1F 20V
VDDI
C5 22F 20V
C4 22F 25V
VSSI
VSSE
1
2
GND
D00
1
R4 10k
2
RESET A(00:18)
D09
1
R3 10k
2
RESET
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14
10 9 8 7 6 5 4 3 25 24 21 23 2 26 1 20 22 27
A0 A1 U5 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE
VCC
A(00:18)
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
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13
10 9 8 7 6 5 4 3 25 24 21 23 2 26 27 1 22 20
C12 0.1F GND
2
A0 A1 U3 A2 27C256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 VPP OE CE
DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7
11 12 13 15 16 17 18 19
D08 D09 D10 D11 D12 D13 D14 D15
D(00:15)
VCC
C11 0.1F GND
GND CS2/RDRAM CS0/WRRAM
VCC CSBOOT/RDROM A14
1 3
VCC 32k x 8-BIT CMOS EPROM
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
Figure 11. 68HC16 Module Schematic (continued)
______________________________________________________________________________________ 21
D(00:15)
MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
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
MAX187 Evaluation System/Evaluation Kit Evaluates: MAX187
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 (c) 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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