_______________General Description
The MAX110 evaluation system (EV system) is a com-
plete, low-cost, two-channel data-acquisition system
consisting of a MAX110 evaluation kit (EV kit) and a
Maxim 80C32 microcontroller (C) module. IBM PC com-
patible software provides a handy user interface to com-
mand 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 1in
2
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
o
Evaluates MAX110 and MAX111
o
Complete Evaluation System
o
Convenient Test Points Provided On-Board
o
Data Logging Software
o
Source Code Provided
o
User-Selectable Resolution and Speed
______________Ordering Information
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-722-8266 for free samples or literature.
PART
TEMP. RANGE
BOARD TYPE
MAX110EVKIT-DIP
0C to +70C
Through-Hole
80C32MODULE-DIP
0C to +70C
Through-Hole
MAX110EVC32-DIP
0C to +70C
Through-Hole
80C32 MODULE
MAX110EV KIT
___________________________________________________________________EV System
19-0375; Rev 1; 3/95
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
2
_______________________________________________________________________________________
___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 neces-
sary 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 40-
pin 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 pro-
gram.
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 suc-
cessfully 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
QTY
DESCRIPTION
1
MAX110 evaluation kit (MAX110EVKIT-DIP)
1
80C32 C module (80C32MODULE-DIP)
________EV System Component List
DESIGNATION QTY
DESCRIPTION
C1C5, C710
9
0.1F ceramic capacitors
C11C15
5
10F, 16V radial tantalum capacitors
C6C16,
C17, C18
4
1F ceramic capacitors
R1-R4
4
1k
, 5% resistors
R5
1
10k
, 8-pin SIP resistor, pin 1 common
R6, R7, R8
3
100
, 5% resistors
R9
1
200
multi-turn potentiometer
R10
1
2.43k
, 1% resistor
R11
1
10k
, 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
____________EV Kit Component List
bottom half of each bar graph shows a rolling aver-
age 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.
10) Apply an input signal between the IN1+ and IN1-
terminals 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 bina-
ry. 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 C module.
1) Verify that shunts are installed at the proper loca-
tions. 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 V
SS
= ground.
2) Replace U1 with a MAX111.
3) Note that the MAX111 uses a 1.25V reference.
Replace resistor R11 with a 2.43k
resistor or
remove jumper J3 and apply an external 1.25V ref-
erence 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 V
SS
supply to GND by installing
the J4 shunt between pins 2 and 3. For the MAX110, tie
the V
SS
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.
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
_______________________________________________________________________________________
3
JUMPER
DEFAULT SETTING
J1
1-2
J2
shorted by trace
J3
shorted by trace
J4
1-2
J5
1-2
J7
closed
J8
closed
J9
shorted by trace
Table 1. Default Jumper Settings
Evaluates: MAX110/MAX111
Be sure to observe frequency and amplitude limits for
the MAX110. The recommended frequency of operation
is 512kHz for XCLK1 mode, 1024kHz for XCLK2
mode, or 2048kHz for XCLK4 mode. The conversion
clock must have a constant, low-jitter frequency, other-
wise the MAX110's linearity will suffer. Refer to the
MAX110 data sheet for additional information.
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 XCLK4 mode is selected in the MAX110
program. The XCLK4 mode must be used when the
RC oscillator is enabled, since the RC oscillator fre-
quency 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 conver-
sion timing or 60Hz rejection, the MAX110's internal RC
oscillator is recommended.
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 volt-
age in the command-line option when starting the pro-
gram (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" com-
mand-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 100k
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.
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:
MAX110 Evaluation System/Evaluation Kit
4
_______________________________________________________________________________________
JUMPER SETTING
FUNCTION
1-2
2-3
XCLK is the output from the MAX110's
internal RC oscillator.
J1
open
Do not operate the EV kit with J1 open.
closed
VREF- connects to ground.
J2
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.
J3
open
VREF+ connects to a user-supplied
reference.
1-2
U1 = MAX110, V
SS
= -5V from ICL7660
2-3
U1 = MAX111, V
SS
= ground
J4
open
V
SS
must be supplied by the user.
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
XCLK is isolated.
J6
--
None
closed
IN1- connects to ground.
J7
open
IN1- does not connect to ground.
closed
IN2- connects to ground.
J8
open
IN2- does not connect to ground.
closed
The V
DD
supply to the MAX110 flows
through this jumper. Use this site to
measure the supply current drawn by
the MAX110.
J9
open
Do not operate the EV kit with J9 open.
Table 2. Jumper Settings on MAX110 EV Kit
XCLK is the clock input to the MAX110.
1) To monitor the MAX110 supply current, install a cur-
rent meter before applying power to the MAX110 EV
kit. Refer to the
Measuring Supply Current section.
Typical supply current is less than 1mA during nor-
mal operation, and less than 4A in shutdown mode
if the internal RC oscillator is used.
2) Follow the quick-start instructions to start the
MAX110 software on the IBM PC.
3) From the Control Panel screen, press "S" to enter
the Shutdown Power Cycling screen.
4) From the Shutdown Power Cycling screen, press
"D" to shut down the MAX110. The supply current
should drop to less than 4A.
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.
A typical application may sample the MAX110 at regu-
lar 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.
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 condi-
tion 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.
Measuring Supply Current
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) Carefully cut the printed circuit board trace at
location J9.
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) Turn on the MAX110 EV kit and restart the MAX110
program to evaluate the desired operating mode.
5) Observe the supply current in both operating and
shutdown modes.
To restore the MAX110 EV kit, use the following
procedure:
1) Turn off the MAX110 EV kit power.
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 V
SS
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 V
SS
edge pad and the
-5V edge pad. Current will flow from the V
SS
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 com-
pletes 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.
Evaluates: MAX110/MAX111
MAX110 Evaluation System/Evaluation Kit
_______________________________________________________________________________________
5
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