MAX191EVKIT-DIP Maxim Integrated, MAX191EVKIT-DIP Datasheet - Page 4

• Manufacturer Part Number: MAX191EVKIT-DIP
• Description: Data Conversion IC Development Tools Evaluation System/Evaluation Kit for the MAX191
• Manufacturer: Maxim Integrated
• Series: MAX191r

Specifications of MAX191EVKIT-DIP

• Interface Type: Parallel, QSPI, Serial (SPI, Microwire)

JJ2 and connect the meter using the two holes present.
The circuit can be returned to normal by soldering a
short piece of wire between the two holes. To evaluate
the MAX191 in its low-current shutdown mode, connect
PD to ground using jumper location JJ1.
The MAX191’s analog inputs are brought to pads
marked AIN+ and AIN-. An optional input filter consist-
ing of 1kΩ resistors (R1 and R2) is in series with the
input and a 0.01µF capacitor (C10) across the input
pins. A wire may be inserted across jumper JJ3 to con-
nect AIN- to ground if the MAX191 is limited to single-
ended input operation.
The 191EVKIT program is one of two separate pro-
grams supplied with the MAX191 EV kit. The program,
which runs on a personal computer, handles the user
interface, controls communications with the 80C32
module, and displays conversion results. It was written
in the C language using Microsoft’s QuickC software
package. The EV System Quick Start section gives
instructions for starting the program as well as for mak-
ing connections to the boards.
The following commands are available whenever the
191EVKIT program is running. A list of these com-
mands is displayed at the bottom of the screen.
Esc..........Clears the data field and redraws the screen.
Ctrl-T... ...Toggles the active serial communications
Ctrl-R... ...Changes the baud rate of the active serial
Ctrl-U... ...Downloads the RAM resident program. Can
Ctrl-X... ...Exits the 191EVKIT program and returns to
MAX191 Evaluation System/Evaluation Kit
4
___________________________Software
_______________________________________________________________________________________
port between COM1 and COM2. The active
port is identified on the bottom status line.
port. The board and program initialize at
1200. If the program is exited with another
rate active, the board must be manually
reset. Higher baud rates are usable for data
uploading and on personal computers with
faster video operations. Data will be lost if the
rate is set too high.
be used to force reloading of the RAM resi-
dent program.
DOS.
191EVKIT Program
Analog Inputs
The second program supplied with the kit is an 80C32
assembly language program that is transferred to the
80C32 module and controls the MAX191 converter.
Both the source code (191RAM.ASM) and hex
(191RAM.MAX) files are on the floppy disk supplied
with the EV kit. The hex file is downloaded automatically
when communications with the module are initiated. It
transmits a logon banner, displays a command prompt,
and changes the lower right-hand corner of the display
to indicate “**** READY ****” when program loading
has been completed.
The command prompt gives the present operating
mode of the MAX191. It indicates the output format
(DECimal or HEXadecimal), the input mode (UNIpolar
or BIPolar), the interface mode (PARallel or SERial),
and the MAX191 V
the following command prompt indicates decimal out-
put format, unipolar input mode, parallel interface
mode, and V
Any of the following commands may be entered when-
ever the prompt is displayed. A command help list will
appear when a question mark “?” is entered.
The following commands are available whenever the
MAX191 RAM resident program has been downloaded
to the 80C32 module. Entering a question mark “?” pro-
duces a help list.
U .............The MAX191 interprets the input as a unipo-
B .............The MAX191 interprets the input as a bipolar
P............Changes the interface mode between the
S............Changes the interface mode between the
V .............Sets the MAX191 V
Z .............Sets the MAX191 V
______________Software Commands
MAX191 RAM Resident Program
MAX191:DEC:UNI:PAR:V
lar (0V to +4.096V) voltage.
(-2.048V to +2.047V) voltage.
80C32 and the MAX191 to parallel.
80C32 and the MAX191 to serial.
supply must be used when the MAX191 input
is expected to go negative.
SS
= 0V.
MAX191 Conversion-Mode
SS
voltage (0V or -5V). For example,
Selection Commands
SS
SS
voltage to 0V.
voltage to -5V. The -5V
SS
= 0V: >