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19-1322; Rev 0; 10/97
MAX125/MAX126 Evaluation Systems/Evaluation Kits
General Description
The MAX125/MAX126 evaluation systems (EV systems) consist of a MAX125/MAX126 evaluation kit (EV kit) and a Maxim 68HC16MOD-16WIDE microcontroller (C) module. The MAX125/MAX126 are high-speed, 8-channel, 14-bit data-acquisition systems with four simultaneous track/holds. Windows 3.1TM/Windows 95TM software provides a handy user interface to exercise the MAX125/MAX126's features. Order the complete EV system for comprehensive evaluation of the MAX125/MAX126 with a personal computer. Order the EV kit if you have already purchased the C module (68HC16MOD-16WIDE) with another Maxim EV system or if you desire custom use in other Cbased systems.
____________________________Features
o Proven PC Board Layout o Complete Evaluation System Samples to 40ksps o Convenient Test Points Provided On Board o Data-Logging Software with FFT Capability o Fully Assembled and Tested
Evaluate: MAX125/MAX126
Ordering Information*
PART MAX125EVKIT MAX125EVB16 MAX126EVKIT MAX126EVB16 TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C INTERFACE TYPE User Supplied Windows Software User Supplied Windows Software
Stand-Alone EV Kits
The MAX125/MAX126 EV kits provide a proven PC board layout to facilitate evaluation of the MAX125/ MAX126. The EV kits must be interfaced to appropriate timing signals for proper operation. Apply dual power supplies (8V min, 20V max) to connector P1, pin 5 (P1-5), and P1-9, with ground at P1-1. Connect the active-low read strobe to P1-38, the write strobe to P1-37, the chip selects to P1-35, and the convert-start signal to P1-36 (Table 1 and Figure 1). Refer to the MAX125/MAX126 data sheet for timing requirements.
*The MAX125 software can be used only with the complete evaluation system (MAX125EVB16 or MAX126EVB16), which includes the 68HC16MOD-16WIDE module together with the MAX125EVKIT or MAX126EVKIT.
EV Systems
The MAX125/MAX126 EV systems operate from a usersupplied +13V to +20V DC power supply. Windows 3.1/Windows 95 software running on an IBM PC interfaces to the EV system board through the computer's serial-communications port. The software can be operated with or without a mouse. Refer to the Quick Start section for setup and operating instructions.
MAX125EVB16 System Component List
PART MAX125EVKIT 68HC16MOD-16WIDE QTY 1 1 DESCRIPTION MAX125 evaluation kit 68HC16 C module with 16-bit parallel interface
MAX126EVB16 System Component List
PART MAX126EVKIT 68HC16MOD-16WIDE QTY 1 1 DESCRIPTION MAX126 evaluation kit 68HC16 C module with 16-bit parallel interface
Table 1. Power-Supply and Timing Signal Connections
PIN P1-1 P1-5 P1-9 P1-35 P1-36 P1-37 P1-38 POWER SUPPLY SIGNAL Ground AVX Positive Supply, +8V to +20V AVX Negative Supply, -8V to -20V AVX Chip AVX Select Convert-Start AVX Write AVX Strobe Read AVX Strobe
Windows 3.1 and Windows 95 are trademarks of Microsoft Corp.
________________________________________________________________ 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 408-737-7600 ext. 3468.
MAX125/MAX126 Evaluation Systems/Evaluation Kits Evaluate: MAX125/MAX126
MAX125EVKIT/MAX126EVKIT Component List
DESIGNATION QTY C1, C2, C4, C5, C6, C9, C10 C3, C8 C7 C11 P1, P2 R1, R6 R2-R5 R7, R8 U1 U2 U3 U4 U5 None None 7 2 1 1 2 2 4 2 1 1 1 1 1 1 1 DESCRIPTION 0.1F ceramic capacitors 10F, 25V tantalum capacitors 4.7F, 6.3V tantalum capacitor 100pF ceramic capacitor 2x20 right-angle connectors 100, 1% resistors 10k, 5% resistors 10, 5% resistors Maxim MAX125 or MAX126 78L05 voltage regulator 74HCT244 79L05 negative-voltage regulator 16MHz clock-oscillator module PC board Software disk: MAX125 Evaluation Kit
Quick Start
Recommended Equipment
You will need the following equipment before you begin: * A small DC power supply (+13V to +20V DC at 250mA) * * * An IBM PC-compatible computer capable of running Windows 3.1 or Windows 95 A spare serial-communications port, preferably a 9-pin plug A serial cable to connect the computer's serial port to the Maxim 68HC16MOD-16WIDE module
Connections and Setup
Perform the following steps to evaluate the MAX125 or MAX126: 1) Carefully connect the boards by aligning the two 40-pin headers of the MAX125/MAX126 EV kit with the two 40-pin connectors of the 68HC16MOD16WIDE module. Gently press them together. The two boards should be flush against each other. 2) Connect a +13V to +20V DC power source to the C module at the terminal block (J2) next to the on/off switch, along the top edge of the C module. Observe the polarity marked on the board. 3) Connect a cable from the computer's serial port to the C module. With 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. The EV kit software checks the modem status lines (CTS, DSR, DCD) to confirm that the correct port has been selected. 4) Install the EV kit software on your computer by running the INSTALL.EXE program on the floppy disk. The program files are copied, and icons are created for them in the Windows 3.1 program manager (or the Windows 95 Start menu). The EV kit software evaluates both the MAX125 and the MAX126. 5) Start the program by opening its icon in the program manager (or Start menu). 6) The program prompts 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 automatically downloads KIT125.B16 to the module. The default device setting is for the MAX125. If using the MAX126, select "MAX126" in the device characteristics dialog box and click on "apply."
List of Files in MAX125 EV Kit
FILE INSTALL.EXE MAX125.EXE MAX125.HLP KIT125.B16 MAX125.INI UNINST.EXE FUNCTION Installs EV kit files onto your computer Application program Help file Loads software into the 68HC16 C Program settings Removes EV kit files from your computer
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MAX125/MAX126 Evaluation Systems/Evaluation Kits
7) Apply input signals to the inputs labeled CH1A-CH4A at the bottom edge of the MAX125/ MAX126 EV kit board. Observe the readout on the screen. You may optionally record readings into a data-log file. Click on the "New Log" button to begin or end data logging. The "Log File Format" dialog box is displayed. One complete line of data is written after all enabled channels have been sampled. The first line of the log file contains the column headings. Each subsequent line contains all enabled channels, separated by commas, tabs, or spaces (previously selected in the "Log File Format" dialog box). Once a log file has been opened, it can be paused or resumed with the corresponding Log menu commands. The program continues to write data to the log file until the "Stop Log" button is clicked.
Evaluate: MAX125/MAX126
Detailed Description of Software
The MAX125/MAX126 digitize up to four inputs from either the A or the B input bank. Conversion time is determined by the number of enabled inputs. The software collects samples at a maximum throughput of 40ksps (one channel) and 26ksps (four channels). The various program functions are grouped into dialog boxes, which are accessible from the Window menu on the main menu bar.
One-Shot Read Tool
The "One-Shot Read Tool" allows direct control of the analog-to-digital converter (ADC) configuration. Select the channel and mode of operation to update the "Control Byte" display. Or, change the "Control Byte" bits directly and observe the change in the "Channel Selection" control. The "Read Now" button writes the configuration information to the ADC and performs one reading.
Keyboard Navigation
If a mouse or other pointing device is not available, use the following keyboard shortcuts (Table 2): * Press ALT+W to display the Window menu, and then select a tool window. * Press the TAB key to select controls within the selected tool window. * * Activate buttons by pressing the spacebar. Use the up/down arrow keys for check boxes, radio buttons, and combo boxes.
Power Cycling Tool
To reduce average supply current demand, the MAX125/MAX126 can be shut down between conversions. From the Window menu, select "Power Cycling Tool." The amount of power saved depends primarily on how long the part is off between conversions. Conversion accuracy depends on the power-up delay, reference capacitor, and time in power-down. Adjust the off-time with the "Delay Between Samples" command. Adjust the on-time with the "Power-Up Delay" command. Using an adequate power-up delay ensures that the desired conversion accuracy is achieved during powercycling modes. The reference must be allowed enough time to stabilize before the measurement is performed. Start with zero power-up delay, and increase the delay time until no further change in accuracy is observed. The power-up delay requirement depends on the value of the reference capacitor and the off-time (delay between samples). The MAX125/MAX126 EV kit software performs powerup by writing a configuration word with the shutdown bit cleared. After power-up, the power-up delay is executed to allow time for the reference voltage to stabilize so that an accurate measurement can be performed.
Scan Tool
You can automatically take readings at regular intervals up to 10 samples per second from user-selected channels by selecting Scan Tool from the Window menu. The "Channel Selection and Configuration" group controls which channels will be scanned. The "Bipolar and Differential" controls are disabled because the MAX125/MAX126's transfer function is bipolar. The "Scan Rate" combo box controls the rate at which measurements are made. Readings are displayed in the "Recent Values" text area.
Table 2. Keyboard-Navigation Shortcuts
KEY TAB ALT+W ALT+space ALT+minus Spacebar ALT+PrintScreen FUNCTION Selects next control Window menu System menu of main program window System menu of child window Clicks on the selected button Copies the image of the main window onto the clipboard
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MAX125/MAX126 Evaluation Systems/Evaluation Kits Evaluate: MAX125/MAX126
Sampling Tool
To sample data at rates up to 40ksps, select "Sampling Tool" from the Window menu, make your selections, and click on the Start button. Adjust the timing delays as appropriate to control the sample rate. Estimate the effective sample rate by taking the reciprocal of the sum of the delay between samples, the power-up delay, and the conversion time. Sample size is restricted to a power of two so that the "Fast Fourier Transform" (FFT) tool can process the data. "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 graphed. Once displayed, the data can optionally be saved to a file.
Changing the Reference Voltage The EV kit software assumes a 2.5V reference voltage, unless otherwise specified. Apply an external 2.5V reference to the REFIN pad to overdrive the internal reference. See the MAX125/MAX126 data sheet for more information. From the Window menu, select "Device Characteristics." Next, type the new reference voltage into the "Reference Voltage" edit box.
Detailed Description of Hardware
The ADC (U1) is an 8-channel, 14-bit data-acquisition system with four simultaneous track/holds. Linear regulators U2 and U4 provide clean analog 5V power supplies for the ADC. R8 and C1 filter digital noise out of the analog power supply. U3 isolates the CS, RD, WR, and CONVST signals from the main system bus to further prevent digital noise from entering the ADC. R7 and C11 filter the TTL clock oscillator to prevent overshoot at the CLK input. The MAX125/MAX126's chip-select (CS) is memorymapped to location 7E000 on the 68HC16 module. This location is used for writing configuration bytes and reading data. The convert-start (CONVST) signal is also memory-mapped and is asserted for one memoryaccess cycle when memory location 7E800 is accessed. The MAX125/MAX126's interrupt (INT) output triggers an interrupt on the 68HC16 through the input capture vector.
FFT Tool
The EV software includes an FFT tool that can display the spectral content of data collected with the highspeed sampling tool. To view the spectral content of a waveform, first select a data sample that was previously collected with the "Sampling Tool." Then select "FFT Tool" from the Window menu. Check the output plots desired and click on the Start button. A data-windowing function preprocesses the data sample before performing an FFT.1) When the input signal is not synchronized to the sampling clock, spectral energy appears to leak into nearby frequency buckets. A suitable data window tapers the raw data to zero amplitude at the beginning and end, reducing this spectral leakage.
Measuring Supply Current
To monitor supply current, measure the voltage across resistor R1 (for the +5V supply) or R6 (for the -5V supply). These resistors are 100 1%, so every 1mV across R1 or R6 represents 10A of supply current.
Device Characteristics
The "Device Characteristics" dialog box contains parameters that are not expected to change often. The device selection is used to select between the MAX125 and the MAX126.
Table 3. Troubleshooting Guide
PROBLEM * * No output measurement. System seems to report zero voltage or fails to make a measurement. CORRECTIVE ACTIONS Check the +5V and -5V supply voltages. Check the 2.5V REFOUT reference voltage using a digital voltmeter. Use an oscilloscope to verify that the 16MHz clock is running and that the conversion-start signal is being strobed.
Evaluating the MAX126 The MAX125 software can evaluate the MAX126 directly. From the Window menu, select "Device Characteristics." Next, change the device type from MAX125 to MAX126. This tells the program that the input voltage span is VREF instead of 2VREF.
*
1) For more information on the FFT and data-windowing functions, refer to W.H. Press, et al., Numerical Recipes in Pascal: The Art of Scientific Computing, Cambridge University Press, 1989, ISBN 0-521-37516-9. 4 _______________________________________________________________________________________
P1-5 8 IN OUT GND GND N.C. 17 P2-1 D0/A0 D1/A1 D2/A2 D3/A3 D4 D5 D6 D7 D8 CH4A 32 CH4A CLK 14 R7 10 8 C11 100pF -5V REFIN 6 C5 0.1F REFOUT 7 C6 0.1F REFOUT C7 4.7F 6.3V 8 CONVST DGND AVSS 31 AGND AGND 36 REFIN 25 CH4B 33 CH4B CH3A 34 CH3A +5V CH3B 35 CH3B CH2B 1 CH2B CH2A 2 CH2A CH1B 3 CH1B CH1A CH1A P2-2 P2-3 P2-4 P2-5 P2-6 P2-7 16 15 14 13 D9 D10 D11 D12 D13 INT JU1 12 11 10 9 30 19 20 21 22 23 24 DVDD 4 AVDD 5 4 3 C2 0.1F C1 0.1F R8 10 2 GND GND N.C. +5V 7 C4 0.1F 6 5 C3 10F 25V 1
R1 100
U2 LM78L05ACM
+5V
P1-6
Figure 1. MAX125 EV Kit Schematic
U3A
1 OE 2 A0 Y0 Y1 Y2 Y3 P2-14 P1-20 28 RD WR CS 27 +5V R3 10k +5V R2 10k 18 29 26 R4 10k +5V 9 7 5 3 12 R5 10k P2-13 14 P2-12 16 +5V P2-11 A1 A2 A3 74HCT244 4 6 8 18 P2-10 P2-9 P2-8
+12V
CS7/7E000
P1-35
CS7
U1
CLK
P1-38
RD
1 U5 16MHz 7 OSCILLATOR
P1-37
WR
MAX125 MAX126
CS8/7E800
P1-36
U3B
19 OE A0 Y0 Y1 Y2 Y3 A1 A2 A3 74HCT244 11 13 15 17
CS8
R6 100 8 N.C. IN IN GND 7 C8 10F 25V C9 0.1F 6 5 OUT IN IN N.C. 1 2 3 4
U4 LM79L05ACM
P1-1 P1-2 -5V C10 0.1F P1-3 P1-4 GND
P1-9
Evaluate: MAX125/MAX126
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-12V
MAX125/MAX126 Evaluation Systems/Evaluation Kits
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MAX125/MAX126 Evaluation Systems/Evaluation Kits Evaluate: MAX125/MAX126
1.0"
1.0"
Figure 2. MAX125/MAX126 EV Kit Component Placement Guide
Figure 3. MAX125/MAX126 EV Kit PC Board Layout-- Component Side
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MAX125/MAX126 Evaluation Systems/Evaluation Kits Evaluate: MAX125/MAX126
1.0"
Figure 4. MAX125/MAX126 EV Kit PC Board Layout--Solder Side
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MAX125/MAX126 Evaluation Systems/Evaluation Kits Evaluate: MAX125/MAX126
NOTES
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68HC16MOD-16WIDE
Component List
DESIGNATION C1 C2, C8-C12, C14 C3 C4, C5 C6, C7 C13 D1 D2 J2 J3 LED1 P1, P2 R1 R2 R3, R4 R5 R6 R7 QTY 1 7 1 2 2 1 1 1 1 1 1 2 1 1 2 1 1 1 DESCRIPTION 10F, 25V electrolytic capacitor 0.1F ceramic capacitors 1F ceramic capacitor 22F, 25V electrolytic capacitors 22pF ceramic capacitors 100F, 25V electrolytic capacitor 1N4001 diode 1N4742A 12V, 1W zener diode 2-circuit terminal block Right-angle printed circuit board mount, DB9 female socket Light-emitting diode 40-pin right-angle male connectors 10M, 5% resistor 330k, 5% resistor 10k, 5% resistors 470, 5% resistor 10k, SIP resistor 100, 5% resistor U3 U4 U4 U5, U8 U6, U9 U6, U9 U7 U10 Y1 None None 1 1 1 2 2 2 1 1 1 4 1 U2 U3 1 1 U1 1 DESIGNATION SW1 SW2 QTY 1 1 DESCRIPTION Slide switch Momentary pushbutton switch 68HC16 microcontroller MC68HC16Z1CFC16 (132-pin plastic quad flat pack) Maxim MAX233CPP 27C256 EPROM containing monitor program 28-pin socket 7805 regulator, TO-220 size Heatsink, thermalloy # 6078 62256 (32K x 8) static RAMs 74HCT245 bidirectional buffers 20-pin sockets Maxim MAX707CPA Maxim ICL7662CPA 32.768kHz watch crystal Rubber feet 5" x 5" printed circuit board
68HC16MOD-16WIDE
General Description
The 68HC16MOD-16WIDE module is an assembled and tested printed-circuit board intended for use with Maxim's high-speed evaluation kits (EV kits). The module uses a full 16-bit implementation of Motorola's MC68HC16Z1 microcontroller (C). It requires an IBMcompatible personal computer and an external DC power supply, typically 12V or as specified in the EV kit manual. Maxim's 68HC16MOD-16WIDE module allows 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.
Detailed Description
Power Input Connector J2
The 68HC16MOD-16WIDE 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 68HC16MOD-16WIDE 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 may use the 16-bit wide bus or use the high-speed queued serial peripheral interface (QSPITM) and the internal chip-select generation. A MAX707 on the module (U7) 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. ________________________________________________________________ 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 408-737-7600 ext. 3468.
68HC16MOD-16WIDE 68HC16MOD-16WIDE
The 68HC16MOD-16WIDE module 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 68HC16MOD-16WIDE module 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 and U8, the user RAM area, are 32kbyte CMOS static RAMs. The 74HCT245 octal buffers let the 68HC16MOD16WIDE module access a 16-bit port on the interface connectors. This memory-mapped port consists of separate read and write strobes, four chip selects, four address LSBs, and sixteen data bits.
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 68HC16MOD-16WIDE module RS-232-compatible data input to 68HC16MOD-16WIDE 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
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.
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 1 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.
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. Use the 68HC16MOD-16WIDE module only with those EV kits that are designed to support it, and only download code that is targeted for the 68HC16MOD-16WIDE module. Downloading incorrect object code into the 68HC16MOD-16WIDE module will have unpredictable results.
40-Pin Connectors P1 and P2
The 20 x 2 pin headers (P1 and P2) connect the 68HC16MOD-16WIDE module to a Maxim EV kit. Table 2 lists the function of each pin.
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 (P1-33 to P1-36) are available on the data connector to be used by Maxim EV kits. Table 3 outlines the address ranges for each of the elements found on the 68HC16MOD-16WIDE module, and Table 4 is a truth table that describes the logic for each of the module's chip-select outputs. Because the addresses are not completely decoded, the boot ROM and has a shadow at address 08000 hex.
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68HC16MOD-16WIDE
Self Check
The 68HC16MOD-16WIDE module includes a self-diagnostic routine, which checks the power supply, microprocessor, RAM, and ROM, independent of the EV kit or computer. Note that it does not exercise the RS-232 port or the EV kit 80-pin interface. Connect the power supply to the power terminals (J2) and 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% duty cycle, then the module passed its self check. If the LED flashes with a 10%-on/90%-off duty cycle, then the module failed its self check. Most likely, one of the RAM chips (U5 or U8) 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.
68HC16MOD-16WIDE
Table 2. P1 and P2 Data-Connector Signals
HEADER PIN 1, 4 5, 6 7, 8 9, 10 11 12 13 14 15 16 17 P1 18 19 20 21 22 23 24 25 26 27 28 29 30 NAME GND VPREREG +5V -12V PCS2 PCS3 PCS0/SS PCS1 MOSI SCK -- MISO IC2 IC1 OC1 IC3 -- OC2 OC4 OC3 PAI IC4 PWMB PWMA 68HC16-16WIDE MODULE FUNCTION Ground return +12V from wall cube +5V from 78M05 -12V from ICL7662 (typically -8V at 15mA load) QSPI peripheral chip select 2 QSPI peripheral chip select 3 QSPI peripheral chip select 0 QSPI peripheral chip select 1 QSPI Master Output, Slave Input QSPI Serial Clock Not used QSPI Master Input, Slave Output General purpose I/O; Input Capture 2; can be used as an IRQ General purpose I/O; Input Capture 1; can be used as an IRQ General purpose I/O; Output Compare 1 General purpose I/O; Input Capture 3; can be used as an IRQ Not used General purpose I/O; Output Compare 2 General purpose I/O; Output Compare 4 General purpose I/O; Output Compare 3 Pulse Accumulator Input General purpose I/O; Input Capture 4; can be used as an IRQ Pulse-Width Modulator B output (drives the status LED) Pulse-Width Modulator A output
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68HC16MOD-16WIDE 68HC16MOD-16WIDE
Table 2. P1 and P2 Data-Connector Signals (continued)
HEADER PIN 31 32 33 34 P1 35 36 37 38 39, 40 1 2-15 16 17, 18 P2 19 20 21 22 23-40 NAME
--
68HC16-16WIDE MODULE FUNCTION Not used Pulse Accumulator Clock Input Chip select strobe for I/O area $7F800 Chip select strobe for I/O area $7F000 Chip select strobe for I/O area $7E000 Chip select strobe for I/O area $7E800 Active low write strobe for I/O area Active low read strobe for I/O area Not used External I/O data bus LSB External I/O data bus External I/O data bus MSB Not used Word address LSB Word address Word address Word address Not used
PCLK CS10/7F800 CS9/7F000 CS7/7E000 CS8/7E800 CS5/WRIO CS1/RDIO
--
EXTD0 EXTD1-14 EXTD15
--
A01 A02 A03 A04
--
Table 3. Memory Map (all address values are in 20-bit hex)
PIN 00000-07FFF 08000-0FFFF 10000-1FFFF 20000-203FF 20400-7DFFF 7E000-7E7FF 7E800-7EFFF 7F000-7F7FF 7F800-7FFFF 80000-F7FFF FUNCTION Boot ROM (U3, strobed by CSBOOT) Shadow of boot ROM User RAM (U5 and U8, strobed by CS0 and CS2) Internal standby RAM; 1kbyte Unused External chip select (P1 pin 35) (CS7) External chip select (P1 pin 36) (CS8) External chip select (P1 pin 34) (CS9) External chip select (P1 pin 33) (CS10) Not accessed by the 68HC16 PIN F8000-FF6FF FF700-FF73F FF740-FF8FF FF900-FF93F FF940-FF9FF FFA00-FFA7F FFA80-FFAFF FFB00-FFB07 FFB08-FFBFF FFC00-FFDFF FFE00-FFFFF 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 FUNCTION
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68HC16MOD-16WIDE 68HC16MOD-16WIDE
Table 4. 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
VCC
C9 0.1F GND
CS6/IOBUFFER CS1/RDIO D00 D01 D02 D03 D04 D05 D06 D07
19 1 2 3 4 5 6 7 8 9
OE DIR A1 A2 A3 A4 A5 A6 A7 A8
GND GND VPREREG VCC -12V PCS2 PCO/SS MOSI IC2 OC1 OC4 PAI PWMB CS10/7F800 CS7/7E000 CS5/WRIO
U6 74HCT245
B1 B2 B3 B4 B5 B6 B7 B8
18 17 16 15 14 13 12 11
EXTD0 EXTD1 EXTD2 EXTD3 EXTD4 EXTD5 EXTD6 EXTD7
VCC
1 2 3 4
P1-1 P1-3 P1-5 P1-7 P1-9 P1-11 P1-13 P1-15 P1-17 P1-19 P1-21 P1-23 P1-25 P1-27 P1-29 P1-31 P1-33 P1-35 P1-37 P1-39
P1-2 P1-4 P1-6 P1-8 P1-10 P1-12 P1-14 P1-16 P1-18 P1-20 P1-22 P1-24 P1-26 P1-28 P1-30 P1-32 P1-34 P1-36 P1-38 P1-40
GND GND VPREREG VCC -12V PCS3 PCS1 SCK MISO IC1 IC3 OC2 OC3 IC4 PWMA PCLK CS9/7F000 CS8/7E800 CS1/RDIO
EXTD0 EXTD2 EXTD4 EXTD6 EXTD8 EXTD10 EXTD12 EXTD14 A01 A03
P2-1 P2-3 P2-5 P2-7 P2-9 P2-11 P2-13 P2-15 P2-17 P2-19 P2-21 P2-23 P2-25 P2-27 P2-29 P2-31 P2-33 P2-35 P2-37 P2-39
P2-2 P2-4 P2-6 P2-8 P2-10 P2-12 P2-14 P2-16 P2-18 P2-20 P2-22 P2-24 P2-26 P2-28 P2-30 P2-32 P2-34 P2-36 P2-38 P2-40
EXTD1 EXTD3 EXTD5 EXTD7 EXTD9 EXTD11 EXTD13 EXTD15 A02 A04
TSTME BKPT/DSCLK BKPT/DSCLK HALT BERR MODCLK DSACK1 DSACK0 IRQ7 CS6/IOBUFFER CS1/RDIO D08 D09 D10 D11 D12 D13 D14 D15
19 1 2 3 4 5 6 7 8 9
R6 10k SIP RESISTOR
5 6 7 8 9 10
OE DIR A1 A2 A3 A4 A5 A6 A7 A8
U9 74HCT245
B1 B2 B3 B4 B5 B6 B7 B8
18 17 16 15 14 13 12 11
EXTD8 EXTD9 EXTD10 EXTD11 EXTD12 EXTD13 EXTD14 EXTD15
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
Figure 1. 68HC16MOD-16WIDE Module Schematic
_______________________________________________________________________________________ 5
68HC16MOD-16WIDE 68HC16MOD-16WIDE
C14 0.1F MISO MOSI SCK PCSO/SS PCS1 PCS2 PCS3 RXD TXD VCC CS10/7F800 CS9/7F000 CS8/7E800 CS7/7E000 CS6/IOBUFFER CS2/RDRAM CS1/RDIO
A01 A02 VCC A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
VCC VSS
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
VCC OC3 OC4 IC4 PAI PWMA PWMB PCLK
VCC IC1 IC2 IC3 OC1 OC2
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/WRRAMHIGH CS5/WRIO VCC CS3/WRRAMLOW CSBOOT/RDROM DOO DO1 DO2 DO3 DO4 DO5 DO6 DO7 DO8 DO9 VCC VSS D10 D11 D12 D13 D14 D15 AOO DSACKO DSACK1 DS VCC
XTAL
EXTAL
CLKOUT FREEZE TSTME BKPT/DSCLK IPIPEO/DS0 IPIPE1/DSI RESET HALT BERR IRQ7
VCC
VCC C3 1F 20V
C10 0.1F
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
6 _______________________________________________________________________________________
MODCLK
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
68HC16MOD-16WIDE 68HC16MOD-16WIDE
R2 330k C7 22pF Y1 32.768kHz C6 22pF XTAL R1 10M EXTAL TXD VCC GND
2
VCC
C8 0.1F GND
2
VCC
7
J3-8 CTS J3-7 RTS T1OUT 5 T2OUT 18 R1IN 4 R2IN 19 C2+ 15 C2+ 10 C216 C211
VCC T1IN T2IN R1OUT R2OUT
J3-2 RXD
1
VCC SW2 RESET
1 2
RXD
5
3
U7 MAX707
PFO 1 6 N.C. MR 8 RESET 4 7 RESET PFI GND
3
J3-3 TXD GND J3-4 DTR J3-6 DSR J3-1 DCD J3-5 GND
20 8
J2 + -
1 2
RESET
C1+ C112 V17 V14 V+
13
U2 MAX233
GND
9
GND
6
SW1 POWER D1 1N4001 VPREREG 1 N.C CAP+ GND CAP8 U10 V+ ICL7662 OSC LV VOUT 7 6 5 C13 100F GND R7 100 D2 IN4742A 12V R4 10k D00 R3 10k D09
J3-9 RI
1
U4 78M05
IN OUT GND
2
2
3
VCC C4 22F 25V
C5 22F 25V
C1 10F
3 4
RESET
-12V
RESET
A00 A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 VCC CSBOOT/RDROM
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 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
VCC
C12 0.1F
A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
10 9 8 7 6 5 4 3 25 24 21 23 2 26 1 20 22 27
A0 A1 U8 A2 62256 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 CS OE WE
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
11 12 13 15 16 17 18 19
D00 D01 D02 D03 D04 D05 D06 D07
VCC
C2 0.1F
A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 A11 A12 A13 A14 A15
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
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
C11 0.1F
GND GND CS2/RDRAM CS3/WRRAMLOW
GND CS2/RDRAM CS0/WRRAMHIGH
32k x 8-BIT CMOS EPROM
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
_______________________________________________________________________________________ 7
68HC16MOD-16WIDE 68HC16MOD-16WIDE
1.0"
Figure 2. 68HC16MOD-16WIDE Module Component Placement Guide
8
_______________________________________________________________________________________
68HC16MOD-16WIDE 68HC16MOD-16WIDE
1.0"
Figure 3. 68HC16MOD-16WIDE Module PC Board Layout--Component Side
_______________________________________________________________________________________
9
68HC16MOD-16WIDE 68HC16MOD-16WIDE
1.0"
Figure 4. 68HC16MOD-16WIDE Module PC Board Layout--Solder Side
10
______________________________________________________________________________________
68HC16MOD-16WIDE 68HC16MOD-16WIDE
NOTES
______________________________________________________________________________________
11
68HC16MOD-16WIDE 68HC16MOD-16WIDE
NOTES
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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