19-1322; Rev 0; 10/97
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
The MAX125/MAX126 evaluation systems (EV systems)
consist of a MAX125/MAX126 evaluation kit (EV kit) and
a Maxim 68HC16MOD-16WIDE microcontroller (µC)
module. The MAX125/MAX126 are high-speed, 8-channel, 14-bit data-acquisition systems with four simultaneous track/holds. Windows 3.1™/Windows 95™ 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
µC module (68HC16MOD-16WIDE) with another Maxim
EV system or if you desire custom use in other µCbased systems.
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.
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.
Table 1. Power-Supply and Timing Signal
Connections
PIN
POWER SUPPLY
SIGNAL
P1–1
AVX
Ground
P1–5
AVX
Positive
Supply, +8V to +20V
P1–9
AVX
Negative
Supply, -8V to -20V
P1–35
AVX Select
Chip
P1–36
AVX
Convert-Start
P1–37
AVX Strobe
Write
P1–38
AVX Strobe
Read
____________________________Features
♦ Proven PC Board Layout
♦ Complete Evaluation System Samples to 40ksps
♦ Convenient Test Points Provided On Board
♦ Data-Logging Software with FFT Capability
♦ Fully Assembled and Tested
Ordering Information*
PART
TEMP. RANGE
INTERFACE TYPE
MAX125EVKIT
0°C to +70°C
User Supplied
MAX125EVB16
0°C to +70°C
Windows Software
MAX126EVKIT
0°C to +70°C
User Supplied
MAX126EVB16
0°C to +70°C
Windows Software
* 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.
MAX125EVB16
System Component List
PART
QTY
DESCRIPTION
MAX125EVKIT
1
MAX125 evaluation kit
68HC16MOD-16WIDE
1
68HC16 µC module with
16-bit parallel interface
MAX126EVB16
System Component List
PART
QTY
DESCRIPTION
MAX126EVKIT
1
MAX126 evaluation kit
68HC16MOD-16WIDE
1
68HC16 µC module with
16-bit parallel interface
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.
Evaluate: MAX125/MAX126
General Description
Evaluate: MAX125/MAX126
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
MAX125EVKIT/MAX126EVKIT
Component List
DESIGNATION QTY
DESCRIPTION
C1, C2, C4,
C5, C6, C9,
C10
7
0.1µF ceramic capacitors
C3, C8
2
10µF, 25V tantalum capacitors
C7
1
4.7µF, 6.3V tantalum capacitor
C11
1
100pF ceramic capacitor
P1, P2
2
2x20 right-angle connectors
R1, R6
2
100Ω, 1% resistors
R2–R5
4
10kΩ, 5% resistors
R7, R8
2
10Ω, 5% resistors
U1
1
Maxim MAX125 or MAX126
U2
1
78L05 voltage regulator
U3
1
74HCT244
U4
1
79L05 negative-voltage regulator
U5
1
16MHz clock-oscillator module
None
1
PC board
None
1
Software disk: MAX125 Evaluation Kit
List of Files in MAX125 EV Kit
FILE
2
FUNCTION
INSTALL.EXE
Installs EV kit files onto your computer
MAX125.EXE
Application program
MAX125.HLP
Help file
KIT125.B16
Loads software into the 68HC16 µC
MAX125.INI
Program settings
UNINST.EXE
Removes EV kit files from your computer
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
µC module at the terminal block (J2) next to the
on/off switch, along the top edge of the µC module.
Observe the polarity marked on the board.
3) Connect a cable from the computer’s serial port to
the µC 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 µC 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.”
_______________________________________________________________________________________
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
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.
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.
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
FUNCTION
Selects next control
Window menu
ALT+space
System menu of main program window
ALT+minus
System menu of child window
Spacebar
Clicks on the selected button
ALT+PrintScreen
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.
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.
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.
Copies the image of the main window
onto the clipboard
_______________________________________________________________________________________
3
Evaluate: MAX125/MAX126
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.
Evaluate: MAX125/MAX126
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
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.
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.
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.
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.
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.
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 100Ω ±1%, so every 1mV
across R1 or R6 represents 10µA of supply current.
Table 3. Troubleshooting Guide
PROBLEM
CORRECTIVE ACTIONS
•
•
No output measurement.
System seems to report
zero voltage or fails to
make a measurement.
•
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.
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
_______________________________________________________________________________________
CS8
CS7
-12V
P1-9
P1-36
CS8/7E800
P1-37
P1-38
P1-35
CS7/7E000
+12V
P1-6
P1-5
WR
8
Y3
Y2
Y1
Y3
Y2
Y1
Y0
74HCT244
A3
A2
A1
A0
OE
U3B
74HCT244
A3
A2
A1
A0
Y0
U3A
OE
C8
10µF
25V
R6
100Ω
17
15
13
11
19
4
6
2
RD
1
C3
10µF
25V
3
5
7
9
12
14
16
18
+5V
C9
0.1µF
+5V
+5V
C4
0.1µF
5
6
7
8
5
6
7
8
OUT
+5V
N.C.
GND
GND
GND
IN
IN
N.C.
N.C.
IN
IN
OUT
U4
LM79L05ACM
R3
10k
R4
10k
R5
10k
N.C.
GND
GND
IN
U2
LM78L05ACM
4
3
2
1
P1-20
P2-14
P2-13
P2-12
P2-11
P2-10
P2-9
P2-8
P2-7
P2-6
P2-5
P2-4
P2-3
P2-2
P2-1
4
3
2
1
R2
10k
18
29
26
27
28
30
9
10
11
12
13
14
15
16
19
20
21
22
23
24
DGND
U1
AVSS
31
MAX125
MAX126
REFIN
CLK
CH4A
CH4B
CH3A
CH3B
CH2B
CH2A
CH1B
CH1A
C1
0.1µF
36
8
7
6
25
32
33
34
35
1
2
3
4
C10
0.1µF
AGND
AGND
REFOUT
5
AVDD
17
CONVST
CS
WR
RD
INT
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3/A3
D2/A2
D1/A1
D0/A0
R8
10Ω
DVDD
C2
0.1µF
+5V
JU1
-5V
C6
0.1µF
C5
0.1µF
-5V
+5V
P1-4
P1-3
P1-2
P1-1
C7
4.7µF
6.3V
REFIN
C11
100pF
CLK
CH4A
CH4B
CH3A
CH3B
CH2B
CH2A
CH1B
CH1A
R7
10Ω
GND
1
U5
16MHz
7
OSCILLATOR
REFOUT
8
14
+5V
Evaluate: MAX125/MAX126
R1
100Ω
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
Figure 1. MAX125 EV Kit Schematic
_______________________________________________________________________________________
5
Evaluate: MAX125/MAX126
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
1.0"
Figure 2. MAX125/MAX126 EV Kit Component Placement
Guide
6
1.0"
Figure 3. MAX125/MAX126 EV Kit PC Board Layout—
Component Side
_______________________________________________________________________________________
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
Evaluate: MAX125/MAX126
1.0"
Figure 4. MAX125/MAX126 EV Kit PC Board Layout—Solder
Side
_______________________________________________________________________________________
7
Evaluate: MAX125/MAX126
MAX125/MAX126 Evaluation
Systems/Evaluation Kits
NOTES
8
_______________________________________________________________________________________
68HC16MOD-16WIDE
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
C1
1
10µF, 25V electrolytic capacitor
SW1
1
Slide switch
DESCRIPTION
C2, C8–C12, C14
7
0.1µF ceramic capacitors
SW2
1
Momentary pushbutton switch
U1
1
68HC16 microcontroller
MC68HC16Z1CFC16 (132-pin
plastic quad flat pack)
C3
1
1µF ceramic capacitor
C4, C5
2
22µF, 25V electrolytic capacitors
C6, C7
2
22pF ceramic capacitors
C13
1
100µF, 25V electrolytic capacitor
U2
1
Maxim MAX233CPP
D1
1
1N4001 diode
U3
1
D2
1
1N4742A 12V, 1W zener diode
27C256 EPROM containing
monitor program
J2
1
2-circuit terminal block
U3
1
28-pin socket
U4
1
7805 regulator, TO-220 size
J3
1
Right-angle printed circuit board
mount, DB9 female socket
U4
1
Heatsink, thermalloy # 6078
LED1
1
Light-emitting diode
U5, U8
2
62256 (32K x 8) static RAMs
2
74HCT245 bidirectional buffers
P1, P2
2
40-pin right-angle male connectors
U6, U9
R1
1
10MΩ, 5% resistor
U6, U9
2
20-pin sockets
1
Maxim MAX707CPA
R2
1
330kΩ, 5% resistor
U7
R3, R4
2
10kΩ, 5% resistors
U10
1
Maxim ICL7662CPA
R5
1
470Ω, 5% resistor
Y1
1
32.768kHz watch crystal
4
Rubber feet
1
5" x 5" printed circuit board
R6
1
10kΩ, SIP resistor
None
R7
1
100Ω, 5% resistor
None
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 (µC). 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 µC. Contact Motorola for µC
information, development, and support. Maxim EV kits
may use the 16-bit wide bus or use the high-speed
queued serial peripheral interface (QSPI™) 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
Component List
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.
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.
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
Table 1. Serial Communications Port J3
PIN
NAME
FUNCTION
1
DCD
Handshake; hard-wired to DTR and DSR
2
RXD
RS-232-compatible data output from
68HC16MOD-16WIDE module
3
TXD
RS-232-compatible data input to
68HC16MOD-16WIDE 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
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.
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.
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 (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.
2
_______________________________________________________________________________________
68HC16MOD-16WIDE
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.
Table 2. P1 and P2 Data-Connector Signals
HEADER
P1
PIN
NAME
68HC16-16WIDE MODULE FUNCTION
1, 4
GND
5, 6
VPREREG
7, 8
+5V
+5V from 78M05
9, 10
-12V
-12V from ICL7662 (typically -8V at 15mA load)
11
PCS2
QSPI peripheral chip select 2
12
PCS3
QSPI peripheral chip select 3
13
PCS0/SS
QSPI peripheral chip select 0
14
PCS1
QSPI peripheral chip select 1
15
MOSI
QSPI Master Output, Slave Input
16
SCK
QSPI Serial Clock
17
—
18
MISO
19
IC2
General purpose I/O; Input Capture 2; can be used as an IRQ
20
IC1
General purpose I/O; Input Capture 1; can be used as an IRQ
21
OC1
General purpose I/O; Output Compare 1
22
IC3
General purpose I/O; Input Capture 3; can be used as an IRQ
23
—
Not used
24
OC2
General purpose I/O; Output Compare 2
25
OC4
General purpose I/O; Output Compare 4
26
OC3
General purpose I/O; Output Compare 3
27
PAI
Pulse Accumulator Input
28
IC4
General purpose I/O; Input Capture 4; can be used as an IRQ
29
PWMB
Pulse-Width Modulator B output (drives the status LED)
30
PWMA
Pulse-Width Modulator A output
Ground return
+12V from wall cube
Not used
QSPI Master Input, Slave Output
_______________________________________________________________________________________
3
68HC16MOD-16WIDE
Self Check
68HC16MOD-16WIDE
68HC16MOD-16WIDE
Table 2. P1 and P2 Data-Connector Signals (continued)
HEADER
PIN
P1
NAME
68HC16-16WIDE MODULE FUNCTION
31
—
32
PCLK
Not used
33
CS10/7F800
Chip select strobe for I/O area $7F800
34
CS9/7F000
Chip select strobe for I/O area $7F000
35
CS7/7E000
Chip select strobe for I/O area $7E000
36
CS8/7E800
Chip select strobe for I/O area $7E800
37
CS5/WRIO
Active low write strobe for I/O area
38
CS1/RDIO
Active low read strobe for I/O area
Pulse Accumulator Clock Input
39, 40
—
1
EXTD0
2–15
EXTD1–14
16
EXTD15
17, 18
—
19
A01
Word address LSB
20
A02
Word address
21
A03
Word address
22
A04
Word address
23–40
—
P2
Not used
External I/O data bus LSB
External I/O data bus
External I/O data bus MSB
Not used
Not used
Table 3. Memory Map (all address values are in 20-bit hex)
PIN
4
FUNCTION
PIN
FUNCTION
00000–07FFF
Boot ROM (U3, strobed by CSBOOT)
F8000–FF6FF
Unused
08000–0FFFF
Shadow of boot ROM
FF700–FF73F
68HC16’s built-in ADC (not used)
10000–1FFFF
User RAM (U5 and U8, strobed by CS0
and CS2)
FF740–FF8FF
Unused
FF900–FF93F
General-purpose timer module (GPT)
20000–203FF
Internal standby RAM; 1kbyte
FF940–FF9FF
Unused
20400–7DFFF
Unused
FFA00–FFA7F
System integration module (SIM)
7E000–7E7FF
External chip select (P1 pin 35) (CS7)
FFA80–FFAFF
Unused
7E800–7EFFF
External chip select (P1 pin 36) (CS8)
FFB00–FFB07
7F000–7F7FF
External chip select (P1 pin 34) (CS9)
Internal standby RAM (SRAM)
control registers
7F800–7FFFF
External chip select (P1 pin 33) (CS10)
80000–F7FFF
Not accessed by the 68HC16
FFB08–FFBFF
Unused
FFC00–FFDFF
Queued serial module (QSM)
FFE00–FFFFF
Unused
_______________________________________________________________________________________
68HC16MOD-16WIDE
68HC16MOD-16WIDE
Table 4. Chip-Select Outputs Truth Table
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
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
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
VCC
LED1
R5
470Ω
C9
0.1µF
VCC
GND
19
CS6/IOBUFFER
CS1/RDIO
1
2
3
4
5
6
7
8
9
D00
D01
D02
D03
D04
D05
D06
D07
OE
DIR
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
VCC
1
2
3
4
R6
10k
SIP
RESISTOR
5
6
7
8
9
10
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
GND
GND
VPREREG
VCC
-12V
PCS2
PCO/SS
MOSI
PWMB
IC2
OC1
OC4
PAI
PWMB
CS10/7F800
CS7/7E000
CS5/WRIO
A01
A03
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
CS6/IOBUFFER
CS1/RDIO
BERR
MODCLK
DSACK1
DSACK0
IRQ7
D08
D09
D10
D11
D12
D13
D14
D15
19
1
2
3
4
5
6
7
8
9
OE
DIR
U9
74HCT245
A1
A2
A3
A4
A5
A6
A7
A8
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
J4-1
J4-2
BERR
GND
J4-3
J4-4
BKPT/DSCLK
GND
J4-5
J4-6
FREEZE
RESET
J4-7
J4-8
IPIPE1/DSI
VCC
J4-9
J4-10
IPIPE0/DS0
Figure 1. 68HC16MOD-16WIDE Module Schematic
_______________________________________________________________________________________
5
68HC16MOD-16WIDE
68HC16MOD-16WIDE
C14
0.1µF
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
VCC
VCC
OC3
OC4
IC4
PAI
PWMA
PWMB
PCLK
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
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
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
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
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/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
C3
1µF
20V
MODCLK
VCC
C10
0.1µF
CLKOUT
FREEZE
TSTME
BKPT/DSCLK
IPIPEO/DS0
IPIPE1/DSI
RESET
HALT
BERR
IRQ7
VCC
EXTAL
XTAL
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
VSS
VCC
CS10/7F800
CS9/7F000
CS8/7E800
CS7/7E000
CS6/IOBUFFER
CS2/RDRAM
CS1/RDIO
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
A01
A02
VCC
VCC
IC1
IC2
IC3
OC1
OC2
MISO
MOSI
SCK
PCSO/SS
PCS1
PCS2
PCS3
RXD
TXD
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
6
_______________________________________________________________________________________
68HC16MOD-16WIDE
C8
0.1µF
VCC
XTAL
C7
22pF
EXTAL
C6
22pF
J3-8
CTS
7
GND
VCC
R1
10M
Y1
32.768kHz
68HC16MOD-16WIDE
VCC
R2
330k
T1IN
T1OUT 5
1
T2IN
T2OUT 18
3
R1OUT
R1IN 4
20
R2OUT
R2IN 19
2
TXD
VCC
GND
J3-7
RTS
J3-2
RXD
2
VCC
U7
MAX707
SW2
RESET
1
5
PFO
1
6
N.C.
MR
8
RESET
4
7
RESET
PFI
GND
2
J2
1
+
2
–
RXD
8
C1+
C112
V17
V14
V+
13
RESET
3
J3-3
TXD
GND
11
C2+
15
C2+
10
C216
C2-
U2
MAX233
GND
GND
9
6
J3-4
DTR
J3-6
DSR
J3-1
DCD
SW1
POWER
J3-5
GND
D1
1N4001
1
1
U4
78M05
IN
C5
22µF
25V
OUT
2
3
VCC
C1
10µF
C4
22µF
25V
GND
2
J3-9
RI
R7
100
VPREREG
3
4
8
U10
V+
ICL7662
N.C
OSC
CAP+
GND
LV
CAP-
VOUT
R4
10k
D2
IN4742A
12V
7
6
5
D00
RESET
R3
10k
-12V
D09
C13
100µF
RESET
GND
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
A14
27
1
22
20
VCC
CSBOOT/RDROM
A0
A1
U3
A2 27C256
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
D08
D09
D10
D11
D12
D13
D14
D15
11
12
13
15
16
17
18
19
A14
VPP
OE
CE
32k x 8-BIT CMOS EPROM
VCC
C12
0.1µF
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
GND
GND
CS2/RDRAM
CS3/WRRAMLOW
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
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
D00
D01
D02
D03
D04
D05
D06
D07
11
12
13
15
16
17
18
19
VCC
C2
0.1µF
CS
OE
WE
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
GND
CS2/RDRAM
CS0/WRRAMHIGH
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
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
D08
D09
D10
D11
D12
D13
D14
D15
11
12
13
15
16
17
18
19
VCC
C11
0.1µF
CS
OE
WE
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
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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