MAX126EVB16 [MAXIM]
Complete Evaluation System Samples to 40ksps;
| 型号： | MAX126EVB16 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Complete Evaluation System Samples to 40ksps |
| 文件： | 总20页 (文件大小：276K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1322; Rev 0; 10/97
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
Evluate:5/MAX126
Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Proven PC Board Layout
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-chan-
nel, 14-bit data-acquisition systems with four simultane-
ous track/holds. Windows 3.1™/Windows 95™ software
p rovid e s a ha nd y us e r inte rfa c e to e xe rc is e the
MAX125/MAX126’s features.
♦ Complete Evaluation System Samples to 40ksps
♦ Convenient Test Points Provided On Board
♦ Data-Logging Software with FFT Capability
♦ Fully Assembled and Tested
Order the complete EV system for comprehensive eval-
uation of the MAX125/MAX126 with a personal comput-
er. 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 µC-
based systems.
Ord e rin g In fo rm a t io n *
PART
TEMP. RANGE INTERFACE TYPE
MAX125EVKIT
MAX125EVB16
MAX126EVKIT
MAX126EVB16
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
User Supplied
Windows Software
User Supplied
S t a n d -Alo n e EV Kit s
The MAX125/MAX126 EV kits p rovid e a p rove n 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.
Windows Software
*The MAX125 software can be used only with the complete eval-
ua tion s ys te m (MAX125EVB16 or MAX126EVB16), whic h
includes the 68HC16MOD-16WIDE module together with the
MAX125EVKIT or MAX126EVKIT.
MAX1 2 5 EVB1 6
S ys t e m Co m p o n e n t Lis t
EV S ys t e m s
PART
QTY
DESCRIPTION
The MAX125/MAX126 EV systems operate from a user-
supplied +13V to +20V DC power supply. Windows
3.1/Windows 95 software running on an IBM PC inter-
faces to the EV system board through the computer’s
serial-communications port. The software can be oper-
ated with or without a mouse. Refer to the Quick Start
section for setup and operating instructions.
MAX125EVKIT
1
MAX125 evaluation kit
68HC16 µC module with
16-bit parallel interface
68HC16MOD-16WIDE
1
MAX1 2 6 EVB1 6
S ys t e m Co m p o n e n t Lis t
Table 1. Power-Supply and Timing Signal
Connections
PART
QTY
DESCRIPTION
MAX126EVKIT
1
MAX126 evaluation kit
PIN
SIGNAL
68HC16 µC module with
16-bit parallel interface
68HC16MOD-16WIDE
1
P1–1
Ground
P1–5
Positive Supply, +8V to +20V
Negative Supply, -8V to -20V
Chip Select
P1–9
P1–35
P1–36
P1–37
P1–38
Convert-Start
Write Strobe
Read 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.
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
MAX1 2 5 EVKIT/MAX1 2 6 EVKIT
Co m p o n e n t Lis t
Qu ic k S t a rt
Re c o m m e n d e d Eq u ip m e n t
You will ne e d the following e q uip me nt b e fore you
begin:
DESIGNATION QTY
DESCRIPTION
C1, C2, C4,
•
•
•
•
A small DC power supply (+13V to +20V DC at
250mA)
C5, C6, C9,
C10
7
0.1µF ceramic capacitors
An IBM PC-compatible computer capable of run-
ning Windows 3.1 or Windows 95
C3, C8
C7
2
1
1
2
2
4
2
1
1
1
1
1
1
1
10µF, 25V tantalum capacitors
4.7µF, 6.3V tantalum capacitor
100pF ceramic capacitor
2x20 right-angle connectors
100Ω, 1% resistors
A spare serial-communications port, preferably a
9-pin plug
C11
P1, P2
R1, R6
R2–R5
R7, R8
U1
A serial cable to connect the computer’s serial port
to the Maxim 68HC16MOD-16WIDE module
10kΩ, 5% resistors
Co n n e c t io n s a n d S e t u p
10Ω, 5% resistors
Perform the following steps to evaluate the MAX125 or
MAX126:
Maxim MAX125 or MAX126
78L05 voltage regulator
74HCT244
U2
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 68HC16MOD-
16WIDE module. Gently press them together. The
two boards should be flush against each other.
U3
U4
79L05 negative-voltage regulator
16MHz clock-oscillator module
PC board
U5
None
None
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.
Software disk: MAX125 Evaluation Kit
Evluate:5/MAX126
3) Connect a cable from the computer’s serial port to
the µC mod ule . With a 9-p in s e ria l p ort, us e 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 s oftwa re c he c ks the mod e m s ta tus line s
(CTS, DSR, DCD) to confirm that the correct port
has been selected.
Lis t o f File s in MAX1 2 5 EV Kit
FILE
FUNCTION
Installs EV kit files onto your computer
Application program
INSTALL.EXE
MAX125.EXE
MAX125.HLP
KIT125.B16
MAX125.INI
UNINST.EXE
Help file
Loads software into the 68HC16 µC
Program settings
4) Ins ta ll the EV kit s oftwa re on your c omp ute r b y
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 man-
ager (or the Windows 95 Start menu). The EV kit soft-
ware evaluates both the MAX125 and the MAX126.
Removes EV kit files from your computer
5) Start the program by opening its icon in the pro-
gram manager (or Start menu).
6) The program prompts you to connect the µC mod-
ule and turn its power on. Slide SW1 to the on posi-
tion. 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.”
2
_______________________________________________________________________________________
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
Evluate:5/MAX126
7) Ap p ly inp ut s ig na ls to the inp uts la b e le d
You may optionally record readings into a data-log file.
Click on the “New Log” button to begin or end data log-
ging. 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 com-
mas, 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 corre-
sponding Log menu commands. The program contin-
ues to write data to the log file until the “Stop Log”
button is clicked.
CH1A–CH4A at the bottom edge of the MAX125/
MAX126 EV kit board. Observe the readout on the
screen.
De t a ile d De s c rip t io n o f S o ft w a re
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 soft-
ware collects samples at a maximum throughput of
40ksps (one channel) and 26ksps (four channels). The
va rious p rog ra m func tions a re g roup e d into d ia log
boxes, which are accessible from the Window menu on
the main menu bar.
On e -S h o t Re a d To o l
The “One-Shot Read Tool” allows direct control of the
analog-to-digital converter (ADC) configuration. Select
the c ha nne l a nd mod e of op e ra tion to up d a te 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.
Ke yb o a rd Na vig a t io n
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.
•
Pre s s the TAB ke y to s e le c t c ontrols within the
selected tool window.
•
•
Activate buttons by pressing the spacebar.
P o w e r Cyc lin g To o l
To re d uc e a ve ra g e s up p ly c urre nt d e ma nd , the
MAX125/MAX126 can be shut down between conver-
sions. From the Window menu, select “Power Cycling
Tool.” The amount of power saved depends primarily
on how long the p a rt is off b e twe e n c onve rs ions .
Conversion accuracy depends on the power-up delay,
reference capacitor, and time in power-down. Adjust
the off-time with the “Delay Between Samples” com-
mand. Adjust the on-time with the “Power-Up Delay”
command.
Use the up/down arrow keys for check boxes, radio
buttons, and combo boxes.
S c a n To o l
You can automatically take readings at regular intervals
up to 10 samples per second from user-selected chan-
nels by selecting Scan Tool from the Window menu.
The “Channel Selection and Configuration” group con-
trols which channels will be scanned. The “Bipolar and
Diffe re ntia l” c ontrols a re d is a b le d b e c a us e the
MAX125/MAX126’s transfer function is bipolar.
Using an adequate power-up delay ensures that the
desired conversion accuracy is achieved during power-
cycling 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 “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
FUNCTION
TAB
Selects next control
ALT+W
Window menu
The MAX125/MAX126 EV kit software performs power-
up by writing a configuration word with the shutdown
bit cleared. After power-up, the power-up delay is exe-
cuted to allow time for the reference voltage to stabilize
so that an accurate measurement can be performed.
ALT+space
ALT+minus
Spacebar
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
ALT+PrintScreen
_______________________________________________________________________________________
3
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
Changing the Reference Voltage
S a m p lin g To o l
The EV kit software assumes a 2.5V reference voltage,
unless otherwise specified. Apply an external 2.5V ref-
erence to the REFIN pad to overdrive the internal refer-
ence. 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.
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
s um of the d e la y b e twe e n s a mp le s , the p owe r-up
delay, and the conversion time. Sample size is restrict-
e d to a p owe r of two s o tha t the “Fa s t Fourie r
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
hos t a nd g ra p he d . Onc e d is p la ye d , the d a ta c a n
optionally be saved to a file.
De t a ile d De s c rip t io n
o f Ha rd w a re
The ADC (U1) is an 8-channel, 14-bit data-acquisition
system with four simultaneous track/holds. Linear regu-
lators U2 and U4 provide clean analog ±5V power sup-
plies 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 fur-
ther prevent digital noise from entering the ADC. R7
and C11 filter the TTL clock oscillator to prevent over-
shoot at the CLK input.
FFT To o l
The EV software includes an FFT tool that can display
the spectral content of data collected with the high-
speed sampling tool.
To view the spectral content of a waveform, first select
a data sample that was previously collected with the
“Sa mp ling Tool.” The n s e le c t “FFT Tool” from the
Window menu. Check the output plots desired and
click on the Start button.
The MAX125/MAX126’s chip-select (CS) is memory-
mapped 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
me mory-ma p p e d a nd is a s s e rte d for one me mory-
a c c e s s c yc le whe n me mory loc a tion 7E800 is
accessed. The MAX125/MAX126’s interrupt (INT) out-
put triggers an interrupt on the 68HC16 through the
input capture vector.
A d a ta -wind owing func tion p re p roc e s s e s the d a ta
sample before performing an FFT.1) When the input sig-
nal 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 spec-
tral leakage.
Evluate:5/MAX126
Me a s u rin g S u p p ly Cu rre n t
To monitor supply current, measure the voltage across
resistor R1 (for the +5V supply) or R6 (for the -5V sup-
ply). These resistors are 100Ω ±1%, so every 1mV
across R1 or R6 represents 10µA of supply current.
De vic e Ch a ra c t e ris t ic s
The “Device Characteristics” dialog box contains para-
meters 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
CORRECTIVE ACTIONS
Evaluating the MAX126
The MAX125 software can evaluate the MAX126 direct-
ly. From the Window menu, select “Device Charac-
teristics.” Next, change the device type from MAX125
to MAX126. This tells the program that the input voltage
•
•
Check the +5V and -5V sup-
ply voltages.
Check the 2.5V REFOUT ref-
erence voltage using a digi-
tal voltmeter.
No output measurement.
System seems to report
zero voltage or fails to
make a measurement.
span is ±V
instead of ±2V
.
REF
REF
•
Use an oscilloscope to verify
that the 16MHz clock is run-
ning and that the conver-
sion-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
_______________________________________________________________________________________
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
Evluate:5/MAX126
5U
1U
1
MAX162
2
U4
A
U3B
Figure 1. MAX125 EV Kit Schematic
_______________________________________________________________________________________
5
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
Evluate:5/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
6
_______________________________________________________________________________________
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
Evluate:5/MAX126
1.0"
Figure 4. MAX125/MAX126 EV Kit PC Board Layout—Solder
Side
_______________________________________________________________________________________
7
MAX1 2 5 /MAX1 2 6 Eva lu a t io n
S ys t e m s /Eva lu a t io n Kit s
NOTES
Evluate:5/MAX126
8
_______________________________________________________________________________________
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
Co m p o n e n t Lis t
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
SW1
QTY
DESCRIPTION
Slide switch
C1
1
7
1
2
2
1
1
1
1
10µF, 25V electrolytic capacitor
0.1µF ceramic capacitors
1µF ceramic capacitor
1
1
C2, C8–C12, C14
SW2
Momentary pushbutton switch
C3
C4, C5
C6, C7
C13
68HC16 microcontroller
MC68HC16Z1CFC16 (132-pin
plastic quad flat pack)
U1
1
22µF, 25V electrolytic capacitors
22pF ceramic capacitors
100µF, 25V electrolytic capacitor
1N4001 diode
U2
U3
1
1
Maxim MAX233CPP
27C256 EPROM containing
monitor program
D1
D2
1N4742A 12V, 1W zener diode
2-circuit terminal block
U3
U4
1
1
1
2
2
2
1
1
1
4
1
28-pin socket
J2
7805 regulator, TO-220 size
Heatsink, thermalloy # 6078
62256 (32K x 8) static RAMs
74HCT245 bidirectional buffers
20-pin sockets
Right-angle printed circuit board
mount, DB9 female socket
J3
1
U4
U5, U8
U6, U9
U6, U9
U7
LED1
P1, P2
R1
1
2
1
1
2
1
1
1
Light-emitting diode
40-pin right-angle male connectors
10MΩ, 5% resistor
330kΩ, 5% resistor
10kΩ, 5% resistors
470Ω, 5% resistor
Maxim MAX707CPA
R2
U10
Maxim ICL7662CPA
R3, R4
R5
Y1
32.768kHz watch crystal
Rubber feet
None
None
R6
10kΩ, SIP resistor
5" x 5" printed circuit board
R7
100Ω, 5% resistor
Ge n e ra l De s c rip t io n
De t a ile d De s c rip t io n
The 68HC16MOD-16WIDE module is an assembled and
te s te d p rinte d -c irc uit b oa rd inte nd e d for us e with
Maxim’s high-speed evaluation kits (EV kits). The mod-
ule us e s a full 16-b it imp le me nta tion of Motorola ’s
MC68HC16Z1 microcontroller (µC). It requires an IBM-
compatible personal computer and an external DC
power supply, typically 12V or as specified in the EV kit
manual.
P o w e r In p u t Co n n e c t o r J 2
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 maxi-
mum of 20V. The 68HC16MOD-16WIDE module typical-
ly requires 200mA of input current.
Ma xim’s 68HC16MOD-16WIDE mod ule a llows c us -
tomers 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.
6 8 HC1 6 Mic ro c o n t ro lle r
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.
6 8 HC1 6 MOD-1 6 WIDE
The 68HC16MOD-16WIDE module uses a phase-locked
loop (PLL) to s e t its b us s p e e d . Crys ta l 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 synthe-
s ize r c ontrol re g is te r, s e le c ting a b us s p e e d of
16.78MHz.
Table 1. Serial Communications Port J3
PIN
NAME
FUNCTION
1
DCD
Handshake; hard-wired to DTR and DSR
RS-232-compatible data output from
68HC16MOD-16WIDE module
2
3
RXD
TXD
RS-232-compatible data input to
68HC16MOD-16WIDE module
4
5
6
7
8
9
DTR
GND
DSR
RTS
Handshake; hard-wired to DCD and DSR
Signal ground connection
U5 and U8, the user RAM area, are 32kbyte CMOS stat-
ic RAMs.
Handshake; hard-wired to DCD and DTR
Handshake; hard-wired to CTS
Handshake; hard-wired to RTS
Unused
The 74HCT245 oc ta l b uffe rs le t the 68HC16MOD-
16WIDE module access a 16-bit port on the interface
connectors. This memory-mapped port consists of sep-
arate read and write strobes, four chip selects, four
address LSBs, and sixteen data bits.
CTS
None
Bo o t 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.
S e ria l Co m m u n ic a t io n s
J3 is an RS-232 serial port, designed to be compatible
with the IBM PC 9-p in s e ria l p ort. Us e a s tra ig ht-
through DB9 male-to-female cable to connect J3 to this
port. If the only available serial port has a 25-pin con-
ne c tor, you ma y us e a s ta nd a rd 25-p in to 9-p in
adapter. Table 1 shows the pinout of J3.
8HCMO-16WIDE
S o ft w a re
All s oftwa re is s up p lie d on a d is k 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.
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 gener-
ates the output voltages necessary to drive RS-232 lines.
Use the 68HC16MOD-16WIDE module only with those
EV kits that are designed to support it, and only down-
load code that is targeted for the 68HC16MOD-16WIDE
module. Downloading incorrect object code into the
68HC16MOD-16WIDE module will have unpredictable
results.
4 0 -P in Co n n e c t o rs P 1 a n d P 2
The 20 x 2 p in he a d e rs (P1 a nd P2) c onne c t the
68HC16MOD-16WIDE module to a Maxim EV kit. Table
2 lists the function of each pin.
Ad d re s s Ra n g e s
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
_______________________________________________________________________________________
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
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.
S e lf Ch e c k
The 68HC16MOD-16WIDE module includes a self-diag-
nostic routine, which checks the power supply, micro-
processor, 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 remains on and does not flash, then the prob-
lem 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.
If the LED flashes with a 50% duty cycle, then the module
passed its self check.
Table 2. P1 and P2 Data-Connector Signals
HEADER
PIN
1, 4
5, 6
7, 8
9, 10
11
NAME
GND
VPREREG
+5V
68HC16-16WIDE MODULE FUNCTION
Ground return
+12V from wall cube
+5V from 78M05
-12V
PCS2
PCS3
PCS0/SS
PCS1
MOSI
SCK
-12V from ICL7662 (typically -8V at 15mA load)
QSPI peripheral chip select 2
12
QSPI peripheral chip select 3
13
QSPI peripheral chip select 0
14
QSPI peripheral chip select 1
15
QSPI Master Output, Slave Input
QSPI Serial Clock
16
17
—
Not used
18
MISO
IC2
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
P1
19
20
IC1
21
OC1
22
IC3
23
—
24
OC2
General purpose I/O; Output Compare 2
General purpose I/O; Output Compare 4
General purpose I/O; Output Compare 3
Pulse Accumulator Input
25
OC4
26
OC3
27
PAI
28
IC4
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
29
PWMB
PWMA
30
_______________________________________________________________________________________
3
6 8 HC1 6 MOD-1 6 WIDE
Table 2. P1 and P2 Data-Connector Signals (continued)
HEADER
PIN
NAME
68HC16-16WIDE MODULE FUNCTION
31
32
Not used
—
PCLK
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
33
CS10/7F800
CS9/7F000
CS7/7E000
CS8/7E800
CS5/WRIO
CS1/RDIO
34
P1
35
36
37
38
39, 40
1
—
EXTD0
External I/O data bus LSB
External I/O data bus
2–15
16
EXTD1–14
EXTD15
External I/O data bus MSB
Not used
17, 18
19
—
P2
A01
A02
A03
A04
Word address LSB
8HCMO-16WIDE
20
Word address
21
Word address
22
Word address
23–40
Not used
—
Table 3. Memory Map (all address values are in 20-bit hex)
PIN
FUNCTION
Boot ROM (U3, strobed by CSBOOT)
Shadow of boot ROM
PIN
FUNCTION
F8000–FF6FF
FF700–FF73F
FF740–FF8FF
FF900–FF93F
FF940–FF9FF
FFA00–FFA7F
FFA80–FFAFF
Unused
00000–07FFF
08000–0FFFF
68HC16’s built-in ADC (not used)
Unused
User RAM (U5 and U8, strobed by CS0
and CS2)
10000–1FFFF
General-purpose timer module (GPT)
Unused
20000–203FF
20400–7DFFF
7E000–7E7FF
7E800–7EFFF
7F000–7F7FF
7F800–7FFFF
80000–F7FFF
Internal standby RAM; 1kbyte
Unused
System integration module (SIM)
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
Internal standby RAM (SRAM)
control registers
FFB00–FFB07
FFB08–FFBFF
FFC00–FFDFF
FFE00–FFFFF
Unused
Queued serial module (QSM)
Unused
4
_______________________________________________________________________________________
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
Table 4. Chip-Select Outputs Truth Table
ADDRESS
RANGE
CSBOOT
CS0
CS1
CS2
CS5
CS6
CS7
CS8
CS9
CS10
0xxxx read
1xxxx read
1xxxx write
7E0xx read
7E0xx write
7E8xx read
7E8xx write
7F0xx read
7F0xx write
7F8xx read
7F8xx write
L
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
H
L
H
H
H
H
L
H
H
H
L
L
L
L
L
L
L
L
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
L
H
H
H
H
H
H
H
L
L
H
L
H
H
H
H
H
L
L
H
L
H
H
H
L
VCC
LED1
R5
470Ω
EXTD0
EXTD2
EXTD4
EXTD6
EXTD8
EXTD10
EXTD12
EXTD14
P2-1
P2-3
P2-5
P2-7
P2-2
P2-4
P2-6
EXTD1
GND
GND
VPREREG
VCC
-12V
PCS2
PCO/SS
MOSI
P1-1
P1-3
P1-5
P1-7
P1-9
P1-11
P1-13
P1-15 P1-16
P1-17
P1-19
P1-2
P1-4
P1-6
GND
GND
VPREREG
VCC
-12V
PCS3
PCS1
SCK
MISO
IC1
IC3
OC2
OC3
IC4
PWMA
PCLK
CS9/7F000
CS8/7E800
CS1/RDIO
EXTD3
EXTD5
EXTD7
EXTD9
EXTD11
EXTD13
EXTD15
PWMB
C9
VCC
P2-8
P1-8
0.1µF
P2-9
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
P1-10
P1-12
P1-14
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
GND
19
1
CS6/IOBUFFER
CS1/RDIO
OE
DIR U6
P1-18
P1-20
A01
A03
A02
A04
IC2
OC1
74HCT245
18
17
16
15
14
13
12
11
2
3
4
5
6
7
8
9
B1
B2
B3
B4
B5
B6
B7
B8
EXTD0
D00
D01
D02
D03
D04
D05
D06
D07
A1
A2
A3
A4
A5
A6
A7
A8
P1-21 P1-22
EXTD1
EXTD2
EXTD3
EXTD4
EXTD5
EXTD6
EXTD7
P1-23
P1-25
P1-27
P1-29
P1-31
P1-33
P1-35
P1-37
P1-39
P1-24
P1-26
P1-28
P1-30
P1-32
P1-34
P1-36
P1-38
P1-40
OC4
PAI
PWMB
CS10/7F800
CS7/7E000
CS5/WRIO
VCC
1
2
3
4
5
6
7
8
9
10
TSTME
BKPT/DSCLK
BKPT/DSCLK
HALT
19
1
CS6/IOBUFFER
CS1/RDIO
OE
R6
10k
SIP
DIR U9
74HCT245
18
17
16
15
14
13
12
11
BERR
2
3
4
5
6
7
8
9
DS
J4-1
J4-3
J4-5
J4-7
J4-9
J4-2
BERR
B1
B2
B3
B4
B5
B6
B7
B8
EXTD8
EXTD9
D08
D09
D10
D11
D12
D13
D14
D15
A1
A2
A3
A4
A5
A6
A7
A8
RESISTOR
BKPT/DSCLK
GND
GND
J4-4
J4-6
MODCLK
DSACK1
DSACK0
IRQ7
EXTD10
EXTD11
EXTD12
EXTD13
EXTD14
EXTD15
FREEZE
IPIPE1/DSI
IPIPE0/DS0
RESET
VCC
J4-8
J4-10
Figure 1. 68HC16MOD-16WIDE Module Schematic
_______________________________________________________________________________________
5
6 8 HC1 6 MOD-1 6 WIDE
C14
0.1µF
MISO
MOSI
SCK
VCC
CS10/7F800
CS9/7F000
CS8/7E800
CS7/7E000
CS6/IOBUFFER
CS2/RDRAM
CS1/RDIO
PCSO/SS
PCS1
PCS2
PCS3
RXD
TXD
18
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
TXD
19
CSO/WRRAMHIGH
CS5/WRIO
BR
FC2
FC1
A01
A02
VCC
ADDR1
ADDR2
VDDE
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
VCC
VDDE
VSSE
FCO
CSBOOT
DATA0
DATA1
DATA2
DATA3
VSSI
DATA4
DATA5
DATA6
DATA7
DATA8
DATA9
VDDE
VSSE
A03
A04
A05
A06
A07
A08
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
CS3/WRRAMLOW
CSBOOT/RDROM
DOO
DO1
DO2
DO3
8HCMO-16WIDE
A09
A10
A11
A12
A13
A14
A15
DO4
DO5
DO6
DO7
DO8
DO9
VCC
VSS
D10
D11
D12
D13
D14
U1
MOTOROLA
MC68HC16Z1CFC16
VSSE
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
ADDRO
DSACK0
DSACK1
AVEC
VCC
VSS
D15
90
89
88
87
86
85
84
AOO
DSACKO
DSACK1
DS
DS
AS
VDDE
VRH
VCC
V
CC
C10
0.1µF
C3
1µF
20V
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
6
_______________________________________________________________________________________
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
VCC
VCC
C8
VCC
R2
0.1µF
330k
J3-8
XTAL
7
CTS
C7
GND
VCC
22pF
J3-7
RTS
R1
10M
Y1
32.768kHz
2
1
5
T1IN
T1OUT
T2OUT
R1IN
TXD
GND
RXD
J3-2
RXD
EXTAL
C6
22pF
18
4
T2IN
2
R1OUT
R2OUT
3
VCC
J3-3
TXD
U7
MAX707
SW2
RESET
R2IN
20
19
GND
5
6
8
7
PFO
8
13
12
17
14
11
15
10
16
1
1
4
2
C1+
C1-
V-
C2+
C2+
C2-
C2-
N.C.
RESET
RESET
MR
PFI
J2
J3-4
DTR
U2
MAX233
1
+
–
RESET
J3-6
DSR
GND
3
V-
2
V+
J3-1
DCD
GND GND
9
6
SW1
POWER
J3-5
GND
D1
J3-9
RI
1N4001
R7
100
8
VPREREG
1
2
3
4
U10
ICL7662
N.C
V+
OSC
LV
R4
U4
D2
7
6
5
10k
IN4742A
12V
78M05
IN
CAP+
GND
CAP-
3
1
D00
D09
RESET
RESET
VCC
OUT
C1
10µF
C5
C4
R3
10k
GND
2
22µF
22µF
25V
25V
VOUT
-12V
C13
100µF
GND
10
11
12
13
15
16
17
18
19
D00
D01
D02
D03
D04
D05
D06
D07
11
12
13
15
16
17
18
19
D08
D09
D10
D11
D12
D13
D14
D15
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
10
11
D08
D09
D10
D11
D12
D13
D14
D15
10
A00
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A01
A02
A03
A04
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
A0
A1
A2
A3
A4
A5
A6
A7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A0
A1
A2
A3
A4
A5
A6
A7
9
8
9
8
12
9
8
U3
27C256
U8
62256
U5
62256
13
7
7
15
7
6
6
16
6
5
5
17
5
4
4
18
4
3
3
19
3
25
24
21
23
2
25
24
21
23
2
25
24
21
23
2
A8
A9
A8
A9
A10
A11
A12
A13
A14
VCC
VCC
A10
A11
A12
A13
A14
VCC
26
1
26
26
1
C11
0.1µF
C12
0.1µF
C2
0.1µF
27
1
A14
A14
VPP
OE
20
22
27
20
22
27
GND
CS2/RDRAM
CS3/WRRAMLOW
CS
OE
WE
VCC
CSBOOT/RDROM
GND
CS2/RDRAM
CS0/WRRAMHIGH
CS
OE
WE
22
20
GND
CE
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
32k x 8-BIT CMOS EPROM
32k x 8-BIT HIGH-SPEED CMOS STATIC RAM
Figure 1. 68HC16MOD-16WIDE Module Schematic (continued)
_______________________________________________________________________________________
7
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
1.0"
Figure 2. 68HC16MOD-16WIDE Module Component Placement Guide
8
_______________________________________________________________________________________
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
1.0"
Figure 3. 68HC16MOD-16WIDE Module PC Board Layout—Component Side
_______________________________________________________________________________________
9
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
1.0"
Figure 4. 68HC16MOD-16WIDE Module PC Board Layout—Solder Side
10 ______________________________________________________________________________________
6 8 HC1 6 MOD-1 6 WIDE
8HCMO-16WIDE
NOTES
______________________________________________________________________________________ 11
6 8 HC1 6 MOD-1 6 WIDE
NOTES
8HCMO-16WIDE
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 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX1270AEAI+
ADC, Successive Approximation, 12-Bit, 1 Func, 8 Channel, Serial Access, CMOS, PDSO28, 5.3 MM, 0.65 MM PITCH, SSOP-28
MAXIM
MAX1270AEAI+T
ADC, Successive Approximation, 12-Bit, 1 Func, 8 Channel, Serial Access, CMOS, PDSO28, 5.3 MM, 0.65 MM PITCH, SSOP-28
MAXIM
MAX1270AEAI/GG8
ADC, Successive Approximation, 12-Bit, 1 Func, 8 Channel, Serial Access, PDSO28, 5.3 MM, PLASTIC, MO-150, SSOP-28
MAXIM
©2020 ICPDF网 联系我们和版权申明