19-3816; Rev 1a; 8/05
MAX110 Evaluation System/Evaluation Kit
The MAX110 evaluation system (EV system) is a complete, low-cost, two-channel data-acquisition system
consisting of a MAX110 evaluation kit (EV kit) and a
Maxim 80C32 microcontroller (µC) module. IBM PC compatible software provides a handy user interface to command the MAX110’s features. Source code is provided in
both C++ and C. Demonstration software includes rolling
average filter and data logging applications. The
MAX110 EV kit includes 1in2 of prototyping area.
The MAX110 EV kit and EV system evaluate both the
MAX110 and MAX111. To evaluate the MAX111, order
a free sample of the MAX111 along with the MAX110
EV kit.
____________________________Features
♦ Evaluates MAX110 and MAX111
♦ Complete Evaluation System
♦ Convenient Test Points Provided On-Board
♦ Data Logging Software
♦ Source Code Provided
♦ User-Selectable Resolution and Speed
______________Ordering Information
PART
MAX110EVC32-DIP
MAX110EVKIT-DIP
80C32MODULE-DIP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
BOARD TYPE
Through-Hole
Through-Hole
Through-Hole
___________________________________________________________________EV System
80C32 MODULE
MAX110EV KIT
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Evaluates: MAX110/MAX111
_______________General Description
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
________EV System Component List
QTY
DESCRIPTION
1
MAX110 evaluation kit (MAX110EVKIT-DIP)
1
80C32 µC module (80C32MODULE-DIP)
____________EV Kit Component List
DESIGNATION QTY
2
DESCRIPTION
C1–C5, C7–10
9
0.1µF ceramic capacitors
C11–C15
5
10µF, 16V radial tantalum capacitors
C6–C16,
C17, C18
4
1µF ceramic capacitors
R1-R4
4
1kΩ, 5% resistors
R5
1
10kΩ, 8-pin SIP resistor, pin 1 common
R6, R7, R8
3
100Ω, 5% resistors
R9
1
200Ω multi-turn potentiometer
R10
1
2.43kΩ, 1% resistor
R11
1
10kΩ, 1% resistor
R12
0
Leave this site empty
U1
1
MAX110CPE
U2
1
ICL7660CPA
U3
1
1.024MHz crystal oscillator module
U4
1
MAX873CPA
J1, J4, J5
3
3-pin headers
J7, J8
2
2-pin headers
J2, J3, J9
0
Leave these sites empty
J6
0
Unused reference designator
H1
1
10-pin header
None
1
Female data connector
None
5
Shunts
None
1
14-pin socket for U3
None
1
16-pin socket for U1
None
1
4.5" x 3" PC board
None
4
Rubber feet
___MAX110 EV System Quick Start
This section applies only to the use of the MAX110 EV
kit operating with the Maxim 80C32 module.
1) Copy the files from the distribution disk to your hard
disk or to blank floppy disks. The MAX110 EV kit
software should be in its own directory. The necessary files are in the root directory of the
distribution disk, and the source code is in the
SOURCE subdirectory. The SOURCE subdirectory
is not required to operate the EV kit.
2) Carefully connect the boards together by aligning
the 40-pin header of the MAX110 EV kit with the 40pin connector of the 80C32 module. Gently press
them together. The two boards should be flush
against one another.
3) Connect a 9V to 15V DC power source to the 80C32
module. The terminal block is located next to the
on/off switch, in the upper right corner of the 80C32
module. Observe the polarity marked on the board.
4) Connect a cable from the computer’s serial port to
the 80C32 module. If using 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 will be required.
5) Start the MAX110 software on the IBM PC by
setting the current directory to match the directory
that contains the Maxim programs, and then type
the program name, “MAX110”. Do not turn off or
disconnect the 80C32 module while the program is
running; if you do, you will have to restart the program.
6) The program will ask to which serial port the 80C32
module is connected. Press the space bar until the
correct port is highlighted, and then press ENTER.
7) The MAX110 program will be in terminal emulation
mode. Turn on the power for the 80C32 module.
The 80C32 module will display its logon banner and
test its RAM.
8) To download and run the RAM resident code on the
80C32 module, press ALT+L (i.e. hold down the
ALT key as you strike the L key). The program
prompts you for the file name. Press the ENTER key
to download and run the file 110CODE.MAX on the
80C32 module.
9) When the RAM resident program has been successfully downloaded, press ALT+C to switch to the
Control Panel screen. A bank of software “switches”
controls the MAX110. Two double-needle bar
graphs display the MAX110’s twin channels. The
_______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
10) Apply an input signal between the IN1+ and IN1terminals of the MAX110 EV kit. Note that if
jumper JU7 is installed, then IN1- is connected to
ground. Observe the readout on the display screen.
11) To examine the bit patterns of the MAX110’s data
input and output, press “B” to switch to the Bit
Manipulation Panel screen. The data input to the
MAX110 is displayed in the upper left corner, and
the output data is displayed in the lower left corner.
A rolling average display of the data received is
displayed underneath the most recently received
data. Data is displayed in hexadecimal and in binary. To switch back to the Control Panel, press “C”.
12) Before turning off power to the MAX110 EV kit, exit
the program by pressing ALT+X.
Stand-Alone MAX110 EV Kit
_________________________Quick Start
This section applies only to the use of the MAX110 EV
kit by itself, without the 80C32 µC module.
1) Verify that shunts are installed at the proper locations. Table 1 shows the standard configuration. As
shipped from the factory, U1 is a MAX110, and the
voltage reference is 2.000V.
2) Connect a regulated +5V DC power supply to the
terminals labeled +5V and GND. The GND pad is
ground, and the +5V pad is the +5V input.
3) Use a voltmeter to verify that at least -4.75V
appears at the -5V pad, and verify that the voltage
reference between VREF+ and VREF- is 2.000V.
4) Connect the interface signals to the DIN, DOUT,
CS, BUSY, and SCK test points. Use the GND test
point as signal ground. See the MAX110 data sheet
for timing information.
5) Apply the input voltage to the input terminals. One
channel is between IN1+ and IN1-, and the other
channel is between IN2+ and IN2-. If shunt J7 is
installed, then IN1- is connected to GND. If shunt J8
is installed, then IN2- is connected to GND. Be sure
to observe the absolute maximum ratings.
____________Evaluating the MAX111
The MAX110 EV kit supports both the MAX110 and the
MAX111 ICs. To evaluate the MAX111 use the following
procedure:
1) While the EV kit is turned off, move J4 to the 2-3
position so that VSS = ground.
2) Replace U1 with a MAX111.
3) Note that the MAX111 uses a 1.25V reference.
Replace resistor R11 with a 2.43kΩ resistor or
remove jumper J3 and apply an external 1.25V reference at VREF.
4) Follow the quick-start instructions for the MAX110.
The MAX111 output codes are identical to the MAX110
output codes. The input voltage range is more restricted
on the MAX111 because it is a single-supply device. Refer
to the MAX110/MAX111 data sheet for more information
on the MAX111’s input voltage range and accuracy.
For the MAX111, tie the VSS supply to GND by installing
the J4 shunt between pins 2 and 3. For the MAX110, tie
the VSS supply to -5V by installing the J4 shunt between
pins 1 and 2.
Detailed Description
________________________of Hardware
Jumper Options
Several jumper blocks allow different configurations of
the MAX110. Jumper functions and default settings are
shown in Tables 1 and 2.
Using an External Clock
To drive the MAX110 with an external clock, use the
following procedure:
1) Put a shunt across J5 pins 2-3, leaving pin 1 open.
2) Put a shunt across J1 pins 1-2, leaving pin 3 open.
3) Connect the external oscillator to the EXTCLK pad.
4) Connect the oscillator ground to the GND pin of
header H1.
Table 1. Default Jumper Settings
JUMPER
J1
J2
J3
J4
J5
J7
J8
J9
DEFAULT SETTING
1-2
shorted by trace
shorted by trace
1-2
1-2
closed
closed
shorted by trace
_______________________________________________________________________________________
3
Evaluates: MAX110/MAX111
bottom half of each bar graph shows a rolling average of the readings for that channel. The AUTO
NULL switch is highlighted. With AUTO NULL and
GAIN CAL both off, the bar graphs read the real
voltage present at the input terminals of the
MAX110.
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
Be sure to observe frequency and amplitude limits for
the MAX110. The recommended frequency of operation
is 512kHz for XCLK÷1 mode, 1024kHz for XCLK÷2
mode, or 2048kHz for XCLK÷4 mode. The conversion
clock must have a constant, low-jitter frequency, otherwise the MAX110’s linearity will suffer. Refer to the
MAX110 data sheet for additional information.
Table 2. Jumper Settings on MAX110 EV Kit
JUMPER SETTING
J1
1-2
XCLK is the clock input to the MAX110.
2-3
XCLK is the output from the MAX110’s
internal RC oscillator.
open
Do not operate the EV kit with J1 open.
Using the Internal RC Oscillator
To use the MAX110’s internal RC oscillator, remove the
shunt from J5 and move the J1 shunt to pins 2-3. Make
sure that the XCLK÷4 mode is selected in the MAX110
program. The XCLK÷4 mode must be used when the
RC oscillator is enabled, since the RC oscillator frequency is approximately 2MHz. To switch back to the
on-board crystal clock oscillator U3, move the J1 shunt
to pins 1-2 and put a shunt across J5 pins 1-2.
Crystal clock oscillators can introduce noise into the
system. For applications that demand reduced noise
and do not require either precisely controlled conversion timing or 60Hz rejection, the MAX110’s internal RC
oscillator is recommended.
FUNCTION
closed
VREF- connects to ground.
J2
J3
open
VREF- does not connect to ground.
2-3
VREF+ connects to the on-board 2V
reference.
1-2
VREF+ connects to the on-board 2.5V
reference.
open
VREF+ connects to a user-supplied
reference.
1-2
U1 = MAX110, VSS = -5V from ICL7660
2-3
U1 = MAX111, VSS = ground
Changing the Reference Voltage
The default reference voltage for the MAX110 EV kit is
2V. When a different reference voltage is selected, for
proper scaling of the displayed output, specify the voltage in the command-line option when starting the program (see Table 3).
To use the 2.5V MAX873 reference directly, carefully
cut the printed circuit trace at J3 between pins 2 and 3,
and then install a 3-pin header. Next, select the 2.5V
reference by installing a shunt at J3 between pins 1
and 2. Start the MAX110 program with the “-V2.5” command-line option, to tell the program that the
reference is now 2.5V. Be sure to observe absolute
maximum ratings for the device being evaluated. An
optional 100kΩ trim pot may be added at site R12 to
trim the MAX873 voltage, if desired.
To supply an external voltage reference, carefully cut
the printed circuit trace at J3, between pins 2 and 3,
and at J2. Connect the reference voltage between the
VREF+ and VREF- pads. Run the MAX110 program,
and use the “-V” command-line option to specify the
reference voltage. Be sure to observe absolute maximum
ratings for the device being evaluated.
J4
open
1-2
XCLK is driven by the crystal oscillator
U3 (note that when J5 is in 1-2
position, J1 must be in 1-2 position).
2-3
XCLK connects to EXTCLK edge pad.
J5
open
J6
—
closed
4
XCLK is isolated.
None
IN1- connects to ground.
J7
open
closed
IN1- does not connect to ground.
IN2- connects to ground.
J8
open
Activating Shutdown Mode
The MAX110 EV kit software can be used to measure
the supply current of the MAX110 in shutdown mode.
To evaluate shutdown mode, use the following
procedure:
VSS must be supplied by the user.
closed
J9
open
IN2- does not connect to ground.
The VDD supply to the MAX110 flows
through this jumper. Use this site to
measure the supply current drawn by
the MAX110.
Do not operate the EV kit with J9 open.
_______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
Jumper J9 can be used to measure the supply current
drawn by the MAX110 IC. To measure the supply current,
use the following procedure:
1) Exit the MAX110 software and then turn off the
MAX110 EV kit power.
2) Follow the quick-start instructions to start the
MAX110 software on the IBM PC.
2) Carefully cut the printed circuit board trace at
location J9.
3) From the Control Panel screen, press “S” to enter
the Shutdown Power Cycling screen.
3) Connect a current meter between the two pins of
J9. The direction of current flow is marked with an
arrow on the board.
4) From the Shutdown Power Cycling screen, press
“D” to shut down the MAX110. The supply current
should drop to less than 4µA.
Measuring Supply Current
4) Turn on the MAX110 EV kit and restart the MAX110
program to evaluate the desired operating mode.
5) From the Shutdown Power Cycling screen, press
“U” to power-up the MAX110. The supply current
should settle at less than 1mA. There will be short
current spikes whenever a command is sent to the
MAX110.
5) Observe the supply current in both operating and
shutdown modes.
A typical application may sample the MAX110 at regular intervals, keeping the MAX110 shut down between
samples. This type of usage can be evaluated by using
the “P” command in the Shutdown Power Cycling
screen. The power-cycling loop repeatedly puts the
MAX110 into sleep mode for a user-specified length of
time, wakes up the MAX110, takes a reading, and
powers the MAX110 down again. The “P” command
runs continuously, until halted by either the “U” or “D”
command.
1) Turn off the MAX110 EV kit power.
The parameters that pertain to the “P” command are as
follows: the state of the PD and PDX bits before and
after shutdown, the sleep time, and the optional NOOP,
AUTO NULL, and GAIN CAL cycles.
The sampling rate is determined by setting the sleep
time, which is the length of time the program keeps the
MAX110 in shutdown mode. The program allows a
maximum sleep time of 65 seconds.
If the internal RC oscillator is used, activating the PDX
bit may cause the BUSY line to remain low. This condition should be cleared by starting the power-up
sequence with a configuration word whose MSB is 0 (a
NOOP cycle). If an external oscillator is used, the PDX
bit has no effect and the NOOP cycle is not required.
Supply current will not be as low as in the internal RC
oscillator mode, unless the external oscillator is halted
during shutdown.
The PDX power-down bit has no effect unless the
internal RC oscillator is being used. Normally, the PD
and PDX bits should be set to 1 in shutdown mode, and
both should be 0 in active mode.
To restore the MAX110 EV kit, use the following
procedure:
2) Disconnect the current meter.
3) Install a 2-pin header and jumper at J9, or use a
small piece of wire to reconnect J9.
If the MAX110 VSS is connected to -5V, the -5V supply
current can be measured in a similar way. Remove the
shunt from J4 1-2 and connect a current meter. Current
will flow from J4 pin 2 to J4 pin 1. Or, the current meter
may be connected between the VSS edge pad and the
-5V edge pad. Current will flow from the VSS edge pad
to the -5V edge pad.
__Detailed Description of Software
When starting the MAX110 program from the DOS
prompt, several command-line options are available.
For a list of available options, run MAX110 with the “?”
command-line option. Refer to Table 3.
When the MAX110 program begins operation, it is in its
Opening screen. Use the space bar to select the serial
communications port to which you have connected the
80C32 module. Press the ENTER key to advance to the
Terminal screen.
The MAX110 program displays its Terminal screen
when it is establishing communications with the 80C32
module. When power is applied to the 80C32 module
or reset is pressed, banner message identifying the
80C32 module is displayed. After the module completes its self check, it says that all tests have passed.
At this point, use the ALT+L command to load the RAM
resident program into the 80C32 module. After the RAM
resident program has been loaded, use the ALT+C
command to advance to the Control Panel screen.
_______________________________________________________________________________________
5
Evaluates: MAX110/MAX111
1) To monitor the MAX110 supply current, install a current meter before applying power to the MAX110 EV
kit. Refer to the Measuring Supply Current section.
Typical supply current is less than 1mA during normal operation, and less than 4µA in shutdown mode
if the internal RC oscillator is used.
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
Table 3. Command-Line Options
OPTION
FUNCTION
Table 4. Opening Screen Commands
KEY
FUNCTION
SPACE BAR
?
Display program version and list of commandline options.
-V
Specify the reference voltage ("-V2.5" means 2.5
volts).
-A
Specify the size of the rolling average queue
("-A10" means average the last 10 readings).
+O
Allow the bar graph to display overrange values
correctly.
-O
Do not compensate the bar-graph display for
overrange values. Values beyond ±VREF will
display incorrectly due to code aliasing.
1
Default to COM1.
2
Default to COM2.
3
Default to COM3.
4
Default to COM4.
-Lmyfile
Specify log file "myfile" to store control-panel
readings.
Assume that the RAM resident program is
CONTINUE
already loaded.
The MAX110 Control Panel screen displays the current
and average values for the MAX110’s two input channels, and offers convenient control of the configuration
settings. Pressing TAB selects a switch, and SPACE
BAR manipulates the switch. The “1” and “2” keys
enable and disable polling for inputs 1 and 2, respectively. The input values may be displayed as raw ADC
counts or as real voltages. Data logging can be
enabled if the program is started with the log file command-line option. Table 6 lists the commands available
in the Control Panel screen.
The MAX110 Shutdown Power Cycling screen allows
evaluation of the shutdown mode. The “D” command
puts the MAX110 into its shutdown state, the “U” command brings the MAX110 out of shutdown, and the “P”
command makes the program alternate between the
shutdown and active states. Refer to the section
Activating Shutdown Mode.
ENTER
Use the selected serial port.
ALT+X
Exit the program.
Table 5. Terminal Screen Commands
KEY
FUNCTION
ALT+P
Return to Opening screen to select a different
COM port.
ALT+L
Begin downloading code to 80C32.
ALT+C
Start the Control Panel screen.
ALT+B
Display the baud-rate menu.
ALT+1
Use 1200 baud.
ALT+2
Use 2400 baud.
ALT+4
Use 4800 baud.
ALT+9
Use 9600 baud.
ALT+R
Send the cold-restart command to 80C32.
ALT+X
Exit the program.
Table 6. Control Panel Commands
KEY
TAB
FUNCTION
Highlight the next switch.
SHIFT+TAB
Highlight the previous switch.
SPACE BAR
Toggle the highlighted switch.
1
Enable or disable polling of input 1.
2
Enable or disable polling of input 2.
C
Display readings as raw ADC counts.
V
Display readings as real voltages.
L
Enable or disable data logging. This command
is available only if the MAX110 program was
started with the -L command-line option.
S
Enter the Shutdown Power Cycling screen.
B
Enter the Bit Manipulation Panel screen.
ALT+X
6
Select next serial port
Exit the program.
_______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
Data Logging
The MAX110 program can store measurements in a file.
Once logging has been enabled, it can be started and
stopped from the Control Panel screen. The numbers
stored in the logging file are signed conversion counts,
which may be converted to voltage values by a simple
calculation.
To enable datalogging, start up the MAX110 program
using the command-line option “-L” to specify the output filename. For example, the command “MAX110
-Lmyfile.dat” creates the file myfile.dat for logging. If
you specify the name of a file that already exists, the
program asks for confirmation before erasing the old
file. An “N” answer exits MAX110 without damaging the
Table 7. Shutdown Power Cycling Panel
Commands
KEY
The numerical value written to the file is the signed integer conversion-count read from the MAX110. To convert the conversion count to a voltage, use the following
formula:
Conversion Count x VREF
Real Voltage = –––––––––––––––––––––––
16384
Note that due to overrange, conversion counts may
extend beyond 16384 to approximately 21000.
FUNCTION
D
Power-down the MAX110 using settings 1-2.
U
Power-up the MAX110 using settings 4-8.
P
Power-cycle the MAX110 using settings 1-8.
1
Toggle the value of the PD bit used in shutdown mode.
2
Toggle the value of the PDX bit used in shutdown
mode.
3
old file. A “Y” answer erases the old file. Once the old
file has been destroyed, it cannot be retrieved.
By default, both channels are polled. To log data from
only one channel, press the “1” or “2” key to turn off the
unused channel. To begin logging data, press the “L”
key. Logging may be suspended and restarted by
pressing “L” again.
The format of the log file is straight ASCII text, with one
reading per channel per line. When only one channel
is enabled, each line contains one reading. When both
channels are enabled, the readings for channel 1 and
channel 2 are separated by a comma. The channel 1
reading is logged first. If both channels are disabled,
no additional data is logged (see Table 9).
Set the sleep time (the length of time the P command
will remain in shutdown mode).
4
Toggle whether a NO OP cycle should be performed
during wake-up.
5
Toggle the value of the PD bit used in active mode.
6
Toggle the value of the PDX bit used in active mode.
7
Toggle whether an AUTO NULL cycle should be performed during wake-up.
8
Toggle whether a GAIN CAL cycle should be performed during wake-up.
L
Enable or disable data logging. This command is
available only if the MAX110 program was started
with the -L command-line option.
C
Return to the Control Panel.
Table 8. Bit Manipulation Panel Commands
KEY
TAB
FUNCTION
Highlight the next bit.
SHIFT+TAB
Highlight the previous bit.
SPACE BAR
Toggle the highlighted bit.
1
Enable or disable polling of input 1.
2
Enable or disable polling of input 2.
C
Enter the Control Panel.
ALT+X
Exit the program.
Table 9. Description of Log-File Format
1. ::=
{ }
2. ::=
|
|
3. ::=
4. ::=
ALT+X Exit the program.
_______________________________________________________________________________________
7
Evaluates: MAX110/MAX111
The MAX110 Bit Manipulation Panel screen offers direct
control of the configuration word and gives a direct
view of the output data word. Note that certain bits of
the control word are used for factory testing and must
be zero; the program prevents these bits from accidentally being set. See Table 8 for a list of commands.
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
Table 10. Data-Connector Interface
PIN No.
80C32
MAX110
1–4
GND
GND
Ground
7, 8
+5V
+5V Supply to MAX110 EV Kit
27
P1.0
+5V
–—–
CS
28
P1.1
SCK
Rising-Edge Clock Input to MAX110
29
P1.2
DIN
Serial Data Input to MAX110
30
P1.3
31
P1.4
DOUT
–———–
BUSY
Source Code
Complete source code for both MAX110.EXE and
110CODE.MAX is provided on disk. MAX110.EXE was
written using Borland C++ version 3.0, and
110CODE.MAX was written using the Avocet 8051
Macro Assembler.
The most relevant subroutine in 110CODE.ASM is
Config110 (see Listing 1). This subroutine writes the
configuration word while simultaneously reading the
data from the MAX110 EV kit. Note that the configuration word does not take effect until the next read/write
operation. Macros have been used to help make the
subroutine easier to understand.
Figures 1 and 2 show the timing specifications. The
80C32 module uses an 11.0592MHz clock, so the
instruction cycle time is 1.085µs
per instruction cycle.
–—–
SCK must be low before CS is activated. SCK’s pulse
width is 4.35µs, with period 17.33µs. The most significant bit is sent first. Configuration data is valid 1.14µs
before the rising edge of SCK. Data from the MAX110
is sampled while SCK is high.
The communication protocol used between MAX110.EXE
and 110CODE is very simple. MAX110.EXE sets up a
8
FUNCTION
Active-Low Chip Select to MAX110
Serial Data Output from MAX110
Active-Low Busy Output from MAX110
configuration word by sending “Cxxxx”, where xxxx
represents the hexadecimal configuration word value.
MAX110.EXE then sends the “R” command, which
writes and reads the MAX110, and prints the hexadecimal value it reads from the EV kit.
Note that the RAM resident code 110CODE.MAX resets
the MAX110 EV kit by sending three configuration bytes
in order: 8C8Ch, 8C88h, and 8C80h. These configuration words reset the MAX110 by turning on auto-null
and gain-calibration mode together, then turning off
auto null, and finally turning off gain calibration. The
MAX110 internally divides the 1.024MHz crystal oscillator clock by two, for an effective clock of 512kHz. The
program uses the 16-bit resolution mode, unless otherwise instructed by the user.
Source files SERCMD.C and MAX110.C form the core
interface to the MAX110 EV kit. To write your own programs using these files, read example programs
SIMPLE.C and NOISE.CPP, and the header files
SERCMD.H and MAX110.H. Both SERCMD and
MAX110 may be compiled under C or C++.
_______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
_______________________________________________________________________________________
Evaluates: MAX110/MAX111
Listing 1. Sample Code to Read and Write to the MAX110
9
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
CS
CONV
DV4 DV2
DIN
CH1 CAL
NUL PDX PD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
POL
OFL
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
SCK
DOUT
BUSY
CONVERSION
Figure 1. MAX110 EV Kit Timing Diagram
17.33µs
SCK
DIN
4.35µs
DATA VALID
1.14µs SETUP
Figure 2. MAX110 EV Kit Detailed Timing Diagram
10
______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
VREF+
Evaluates: MAX110/MAX111
+5V
VREF–
R8
100Ω
2
U4
1
MAX873
4
R1*
1kΩ
J3
6
7
C11
10µF
2
R10
2.43kΩ
1%
C13
10µF
IN1+
C1*
0.1µF
1
16
IN1+
3
IN1–
J7
C18*
1µF
C8*
0.1µF
VREF–
3
IN2+
VREF+
IN2–
U1
R3*
1kΩ
15
IN2+
C2*
0.1µF
14
C17*
1µF
R4*
1kΩ
IN2–
J8
MAX110
MAX111
4
+5V
+5V
2
R11
10kΩ
1%
R12
100kΩ
OPTIONAL
R2*
1kΩ
IN1–
J2
R9
200Ω
C4
0.1µF
C16*
1µF
J9
R6
100Ω
7- 8
C12
10µF
VDD
VSS
C3
0.1µF
R7
100Ω
13
VSS
C10
0.1µF
C15
10µF
J4
C5
0.1µF
1
+5V
GND
2
3
12
+5V
GND
3
+5V
1- 4
J1 2
C9
0.1µF
7
RCSEL
C7
0.1µF
1
14
U3
1.024
MHz
CLOCK
5
2
J5
8 1
2
6
C6
1µF
XCK
3
DIN
7
SCK
8
DOUT
CS
BUSY
+5V
2
27
P1.1
28
P1.2
29
P1.3
30
P1.4
31
U2
7660
3
EXT CLK
P1.0
4
3
5
6
5
C14
10µF
11
GND
10
9
R5 10k SIP
4
–5V
8
7
*NOTE:
C1, C2, C8, C16, C17, C18,
R1–R4 ARE OPTIONAL NOISE
FILTERS FOR HIGH-IMPEDANCE
SOURCES.
8
CS
SCK
DIN
DOUT
BUSY
Figure 3. MAX110 EV Kit Schematic Diagram
______________________________________________________________________________________
11
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
Figure 4. MAX110 EV Kit Component Placement Guide—
component side
Figure 6. MAX110 EV Kit PC Board Layout—Solder Side
Figure 5. MAX110 EV Kit PC Board Layout—Component Side
12
______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
DESIGNATION
QTY
DESCRIPTION
C1, C2
2
15pF ceramic capacitors
C4, C5, C6, C7,
C8, C9, C10,
C11, C12
9
0.1µF, 50V ceramic capacitors
C3, C13, C14
3
22µF, 16V radial electrolytic
capacitors
D1
1
1N4001 diode
J1
1
40-pin right-angle male connector
J2
1
DB9 right-angle socket
R1
1
620Ω resistor
RS1
1
10kΩ, 10-pin, 9-resistor SIP
SW1
1
Power switch
SW2
1
Reset switch
IC1
1
80C32
IC2
1
MAX233CPP
IC3
1
27C64
IC4
1
74HCT573
IC5
1
74HCT139
IC6
1
74HCT08
IC7
1
74HCT245
IC8
1
62256
IC9
1
78M05
IC10
1
MAX707CPA
Y1
1
11.059MHz crystal
None
1
2-pin power connector
None
1
28-pin 600-mil socket for IC3
(the EPROM)
None
4
Rubber feet
None
1
3.00" x 5.50" PC board
80C32 Module
_________________General Description
The Maxim 80C32 microcontroller (µC) module is
intended for use with this and other Maxim evaluation
kits (EV kits). It contains the 80C32 µC, RS-232 interface, 8kbytes of EPROM, 32kbytes of static RAM, and
address decoding logic. A 40-pin connector mates
with a connector found on Maxim EV kits designed to
interface with the 80C32 module.
The module is connected to an IBM-compatible
personal computer over a serial communications port.
Software provided with each EV kit runs on the
computer and controls the unit consisting of the 80C32
module and EV kit. The program uses a routine stored
in the 27C64 EPROM to download special 80C32 code
for each kit. The downloaded code controls the EV kit
and, together with the program running on the personal computer, displays the output data.
The board operates from a single 8V to 22V supply.
Both the pre-regulated and regulated +5V levels are
available to the EV kit through the 40-pin connector.
80C32 Module Power Supply
The Maxim 80C32 module requires an input of 8V to 22V
for normal operation. An on-board 78M05 power regulator supplies the 5V required for the logic on the module,
and any 5V requirements for the EV kit attached to the
40-pin connector. The pre-regulated voltage is also
available on the data connector. The source must be
capable of supplying 100mA for the module and meeting the load requirements of the EV kit.
Microprocessor Supervisor
A MAX707 on the module monitors the 5V logic supply,
generates the power-on reset, and produces a reset
pulse whenever the reset button is pressed. A watchdog function was not included because they frequently
interfere while debugging programs, and debugging is
a prime function of this board.
80C32 Microcontroller
The 80C32 is a member of the popular Intel 8051 family
of µCs. It is a low-power CMOS version that requires
external ROM for program storage, 256 bytes of internal RAM, and four 8-bit I/O ports. Three of the ports are
required by the system for serial communications and
memory control. The fourth port (P1) is available
through the data connector.
The 80C32 communicates with the PC over a serial
RS-232 link. A MAX233 acts as a level shifter between
the ±15V RS-232 signals and the TTL levels of the
80C32. The MAX233 also generates the output
voltages necessary to drive RS-232 lines.
Port 0 (pins 32–39) of the 80C32 multiplexes the lower
eight bits of memory address and the eight bits of
read/write data. The lower eight bits of address data
are latched during each I/O cycle by the 74HCT573
octal latch. The latch is controlled by the address latch
enable (ALE) signal of the 80C32. Port 2 (pins 21–28) of
the 80C32 supplies the upper eight bits of address
information.
______________________________________________________________________________________
13
Evaluates: MAX110/MAX111
____80C32 Module Component List
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
The port 3 pins (10–17) provide several unrelated
functions. Pins 10 and 11 are used as the receive data
(RxD) and transmit data (TxD) pins of the RS-232 link.
Pins 16 and 17 act as the write (WR) and read (RD)
control signals for the data I/O cycles. Four other pins
are configured as interrupt and timer controls, but are
not used on this board.
Memory
The board has a 27C64 EPROM containing code for
initializing the 80C32 and downloading additional
program code to the 62256 RAM. After a reset, the
EPROM resident code initializes the 80C32, determines
the address range of the RAM, sets the RS-232 baud
rate to 1200, and waits for communications from the
PC. Receiving any character will prompt the program to
send an initial banner that includes the program name,
revision level, and boundaries of the on-board RAM.
The 62256 CMOS (32kbyte) static RAM is used to hold
program code for the various Maxim EV kits that use
the 80C32 module as the controller. Programs are
transferred from disk to the RAM using software running on a personal computer, such as MAXLOAD or
other programs provided with Maxim EV kits. Programs
written to execute from this RAM start at 4000 (HEX)
and are typically less than 4kbytes long. The remaining
RAM is available for data storage.
Data I/O Connector
A 40-pin connector mounted on the edge of the printed
circuit board provides connection between the µC
module and other Maxim EV kits. Both power and digital signals are transferred via the connector. To join the
module board with an EV kit, carefully align and insert
the pins on the connector with the mating 40-pin
female connector of the kit. The pin functions are listed
in Table 12.
Table 12. I/O Connector Pin Functions
PIN
1–4
5, 6
7, 8
9
10
11
12
13
14
15–18
19–26
27–34
35–40
FUNCTION
Ground
Pre-regulator input
Regulated +5V
RD
WR
CS0
CS1
CS2
CS3
ADDR0–ADDR3
DB0–DB7
P1.0–P1.7
Reserved
DESCRIPTION
Read strobe
Write strobe
Address C000–CFFF
Address D000–DFFF
Address E000–EFFF
Address F000–FFFF
Lowest 4 bits of address
8-bit data bus
8 bits of port 1
Address Ranges
Logic on the module board generates various enable
signals for different address ranges. The ROM and
RAM enable signals are fed directly to the respective
chips. Several additional signals (CS0–CS3) are
available on the data connector to be used by Maxim
EV kits. Table 11 outlines the address range for each of
the elements found on the 80C32 module.
Table 11. Address Ranges in Hexadecimal
14
ADDRESS RANGE (HEX)
ENABLE SIGNAL
0000
➔
3FFF
ROM
4000
➔
BFFF
RAM
C000
➔
CFFF
CS0
D000
➔
DFFF
CS1
E000
➔
EFFF
CS2
F000
➔
FFFF
CS3
Software Architecture
Software for EV kits using the Maxim 80C32 module is
divided into three elements: the interface program running on an IBM-compatible PC, a module program
located in EPROM, and a program supplied on disk
that is transferred to the RAM located on the module.
EPROM Resident Program
The EPROM resident program initializes the 80C32,
establishes communications over the RS-232 link, verifies the static RAM, and downloads other programs. Its
operation starts on power-up and whenever the reset
button is pressed. After reset, the program waits indefinitely to receive a character over the RS-232 port. When
the first character is received, a logon banner identifying
the module and firmware revision is transmitted.
______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
Evaluates: MAX110/MAX111
Figure 7. 80C32 Module Component Placement Guide (2x)
Immediately following transmission of the logon banner,
the program runs a checker routine for the on-board
256kbit static RAM. The RAM is filled with several patterns and then read to verify that each pattern has been
retained. A pass or fail indication is displayed on the
personal computer after each pass. EV kit software
requires proper operation of the RAM. Do not attempt
to use the board if any of the RAM checks fail.
Two other programs for the EV kits are provided on a
floppy disk shipped with each kit. One program acts as
the user interface and transmits commands to the
80C32 module. The other is an 80C32 application program that executes from the RAM located on the
module. The procedure for loading the programs varies
with each kit, so follow the instructions provided.
______________________________________________________________________________________
15
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
34
P1.0-P1.7
27-34
ALL D9 MNEMONICS REFER
TO THE HOST (DTE)
5
GND
1
DCD
4
DTR
6
DSR
27
2
TXD
3
RXD
7
RTS
8
CTS
MAX233A
U2
+5V
2
+5V
5 T1
OUT T1IN
18 T2
T2
4 R1OUT R1 IN
19 R2IN R2OUT
OUT
11 IN
C1+
C2+
15
C1C2+
10
VC216
VC2GND GNDV+
6
9
2
1
3
20
8
13
12
17
14
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
9
SW1
RESET
MAX707
+5V
U10
1
MR RESET
2
RESET
V
3 CC
GND N.C.
4
PFO
PFI
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RXD
TXD
-INT0
-INT1
T0
T1
-WR
-RD
RST
C1 27pF18
8
7
6
5
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
-EA
A15
A14
A13
A12
A11
A10
A9
A8
39
38
37
36
35
34
33
32
30
31
28
27
26
25
24
23
22
21
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
11
2 1
Q1
3 D1
4
74HCT
5
573
6
U4
7
D
8
9 D8
Q8
19
18
17
16
15
14
13
12
15
14
13
12
11
10
9
8
XTAL2
29
XTAL1 -PSEN
XX1
11.059MHz
C2
1
U6 HCT08
27pF
3
2
+5V 4
U6 HCT08
6
+5V 12 5
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
10
9
8
7
6
5
4
3
25
24
21
23
2
26
22
20
A0
O0
A1
O1
A2
O2
A3
O3
A4
O4
A5
O5
A6
O6
A7
O7
A8 27C64
A9 U3
A10
A11
VPP
A12
N.C./A13 PCM
C
E
11
12
13
15
16
17
18
19
+5V
1
27
19
14 2 A0
0
3 A1 U5 1
15
HCT139 2
1
EN
3
4
5
6
7
9 U6 HCT08
8
10
11
13
U6 HCT08
Figure 8. 80C32 Module Schematic
16
______________________________________________________________________________________
MAX110 Evaluation System/Evaluation Kit
+5V
RS1
U8
62256
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
10
9
8
7
6
5
4
3
25
24
21
23
2
26
1
20
22
27
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
-CS
-OE
-WR
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
I/O8
11
12
13
15
16
17
18
19
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
1 19
2
DIR EN B1
3 A1
4
74HCT
5
/245
6
U7
7
H
8
9 A8
B8
10k
18
17
16
15
14
13
12
11
12
0
11
1
LS139 10
2
U5
15
9
EN
3
13
ADDR0-4
15-18
DB00-DB07
19-26
14 A0
13 A1
12
3
Evaluates: MAX110/MAX111
0
1
2
-CS0 - -CS3
11-14
-RD 9
-WR 10
RESERVED
35-40
+5V
POWER
LED
R1
620Ω
78M05
U9
C4-C12
0.1µF
+
C3
47µF
+
C13
47µF
VOUT
VIN
+5V
7-8
V++
5-6
SW2 POWER SWITCH
VIN POWER CONNECTOR
C14 47µF
GND
GND
1-4
Figure 8. 80C32 Module Schematic (continued)
______________________________________________________________________________________
17
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
Figure 9. 80C32 Module Component-Side Layout (2x)
18
______________________________________________________________________________________
Figure 10. 80C32 Module Solder-Side Layout (2x)
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19
© 1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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