4) Connect a 9V to 15V DC power source to the µC

module at the terminal block located next to the

on/off switch, in the upper-right corner of the µC

module. Observe the polarity marked on the board.

5) Connect a cable from the computer’s serial port to

the µC module. If using a 9-pin serial port, connect

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.

6) Start the MAX1110 program by opening its icon in

the Program Manager (or Start Menu).

7) 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 KIT1110.L11 to

the module.

8) Apply input signals to the CH0–CH7 inputs at the

right edge of the MAX1110 EV kit board. Observe

the readout on the screen.

Evaluating the MAX1112

To evaluate the MAX1112, turn off power to the kit,

adjusting trim pot R2 on the 68L11D module. No other

hardware changes are necessary. Start the MAX1110

software, and change the assumed reference voltage

from 2.048V to 4.096V. Refer to the section

Changing

the Reference Voltage.

__Detailed Description of Software

Shutdown Power Cycling

To reduce average supply-current demand, the

MAX1110 can be shut down between conversions.

From the Power menu, select Full Power-Down mode.

The amount of power savings depends primarily on

how long the part is off between conversions. The

accuracy of the conversions depends on the power-up

delay, the reference capacitor, and the time in power-

down. Adjust the off-time with the Delay Between

Samples command. Adjust the on-time with the Power-

Up Delay command.

Using an adequate power-up delay ensures conversion

accuracy during power-cycling modes. The reference

must be allowed enough time to stabilize before the

measurement is performed. The Power-Up Delay com-

mand controls the power-up delay. Increase the delay

until no further change in accuracy is observed. The

power-up delay requirement depends on the value of

the reference capacitor (C9) and the off-time (delay

between samples).

The MAX1110 EV kit software performs power-up by

starting a conversion and discarding the reading. When

the power-up delay is complete, the reference voltage

is correct, and an accurate measurement can be per-

formed.

Measuring Supply Current

On the EV kit board, the MAX1110 draws all its power

through jumper JU5, which is wired closed when the

board is shipped from the factory. To measure the

MAX1110’s supply current, modify the board (with the

power off) by cutting jumper JU5 and connecting a cur-

rent meter across JU5.

Low-Speed Data Logging

The RS-232 serial link limits the data-logging sample

rate to no more than 10 samples per second. The Log

menu can be used to write data to a user-specified file

in comma-spaced-value text format. From the Log

menu, select Select Channels, and select the channels

you want to log. Next, pick the New Log File command

from the Log menu. Once a log file has been opened, it

can be paused or resumed with the Pause command.

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 of the log file contains all enabled channels, sepa-

rated by commas, tabs, or spaces. The program con-

tinues to write data to the log file until the Done com-

mand is selected from the Log menu.

High-Speed Data Sampling

For sampling rates up to 5ksps, the high-speed sam-

pling commands can be used. Data can be collected

from any single channel at high speed, using the com-

mands on the Sample menu. First, select the number of

samples. Then, set the sampling rate by inserting a

delay between samples, or choosing one of the preset

sample rates. To begin collecting data, use the Collect

command. After the samples have been collected, the

data is automatically uploaded to the host and is

graphed. The data can optionally be saved to a file.

Changing the Reference Voltage

The MAX1110 EV kit software assumes a 2.048V refer-

ence voltage, unless otherwise specified. To change

the reference voltage assumption, use Set Reference

Voltage under the Device menu.

MAX1110 Evaluation System/

Evaluation Kit

2

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