Datasheet
MAX1270 EV Kit/EV System
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Evaluates: MAX1270/MAX1271/MAX127/MAX128
• An IBM PC-compatible computer 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 68HC16MODULE-DIP module
Procedure
1) Carefully connect the boards by aligning the 40-pin
header of the MAX1270 EV kit with the 40-pin con-
nector of the 68HC16MODULE-DIP module. Gently
press them together. The two boards should be
flush against one another.
2) Connect an +8V to +12V DC-power source to the
µC module at terminal block J2, located next to the
ON/OFF switch, along the top edge of the µC mod-
ule. Observe the polarity marked on the board.
3) Connect a cable from the computer’s serial port to
the µC 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 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 software on your computer by running the
INSTALL.EXE program on the floppy disk. The pro-
gram files are copied and icons are created in the
Windows 3.1 Program Manager (or the Windows 95
Start Menu). The EV kit software evaluates both the
MAX1270 and the MAX1271.
5) Start the MAX1270 program by opening its icon in
the Program Manager (or Start Menu).
6) The program will prompt 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 will automatically download
KIT1270.C16 to the module.
When the software successfully establishes com-
munication with the EV kit board, you will see a
Device Characteristics Tool and some other win-
dows. The default device setting is for the
MAX1270. If you are using the MAX1271, select
MAX1271 in the Device Characteristics dialog box,
and click the Apply button.
7) Apply input signals to the inputs labeled CH0–CH7,
at the right edge of the MAX1270 EV kit board.
Observe the readout on the screen.
Using Op Amp Buffers
Applications measuring high-impedance sources may
require buffers to ensure full measurement accuracy.
The MAX1270EVKIT can be used with optional user-
supplied quad op amp buffers. Simply unplug the 14-
pin headers at U2 and U3 and install a suitable unity-
gain-stable quad op amp.
Detailed Description
of Software
The various program functions are grouped into dialog
boxes that are accessible from the Window menu on
the main menu bar.
Keyboard Navigation
If a mouse or other pointing device is not available,
operate the program using the following keyboard
shortcuts.
• Press ALT+W to bring up the Window menu and then
select a tool window.
• Press the TAB key to select controls within the select-
ed tool window.
• Activate buttons by pressing the space bar.
• Use the up/down arrow keys for check boxes, radio
buttons, and combo boxes.
Scan Tool
You can take readings automatically from selected
channels at regular intervals up to 10 samples per sec-
ond by selecting Scan Tool from the Window menu. The
Channel Selection and Configuration group controls
which channels will be scanned.
The Scan-Rate combo box controls the rate at which
measurements are made. Readings are displayed in
the Recent Values text area.
Table 1. Keyboard Navigation Shortcuts
KEY FUNCTION
TAB Select next control
ALT + W Window menu
ALT + space System menu of main program window
ALT + minus System menu of child window
Space Bar Click on the selected button
ALT + Print Screen
Copy the image of main window onto
the clipboard