DS1702K datasheet(2/16 Pages) MAXIM

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USING THE DS1621/1721K EVALUATION KIT

Once the 2-wire cable is connected to the serial port, you

may then turn on the +3V to +5V regulated power supply to

power the board. Next, run the DS1721K.exe executable

to view the screen shown in Figure 3.0.

Figure 3.0 DS1621/1721K Start-Up Splash Screen

The splash screen will appear if the DS9123 module is

connected to the serial port. The evaluation board does not

need to be present to run the software.

However, upon loading the software some registers are

initialized; therefore, it is recommended that the evaluation

board be present and powered upon software startup.

Power for the DS9123 module is obtained via the serial

port. If the DS9123 module is not present, the software

will not load. The only way to escape this mode is to

reboot or Ctrl-Alt-Del to End Task. If problems occur during

the program start-up, check the DS9123 to make sure it is

properly connected. Remove and reconnect if necessary.

THE TEMPERATURE SENSOR TAB

Upon successful loading of the software, the Temp. Sensor

screen as shown in Figure 4.0 should appear. The

Temperature Sensor screen is a tabbed user interface. All

functions of the device may be accessed through this

screen. The user may choose to populate the board with

either the DS1621 device or the DS1721 device. The user

may simply click the “On” button to begin immediately

reading the device temperature in both Celsius and

Fahrenheit.

As the evaluation board is designed to test no more than

two devices at a time, the user must choose which device

will be socketed. If testing the DS1621, the user may click

on the “->1621” tree-view to obtain access to all of the

DS1621 internal registers or by simply clicking on the

“1621” radio button.

Figure 5.0 illustrates the tree-view when the user clicks on

the “1621” radio button. All of the DS1621 device registers

are displayed. By clicking on each of the commands in the

tree-view, the user may execute a command such as “Start

Conversions” or read and write to specific registers. The

software is designed to initialize the DS1721 device upon

start up and to look for the device at address “000”. The

user may change the address by clicking the appropriate

address at the top of the tab. Corresponding jumpers JP1,

JP2, and JP3 or JP5, JP6, and JP7 should be in place.

When the DS1721 150mil SO is used, the device will be

placed in the OTS socket. Jumpers JP11 and JP12 will be

removed when this socket is populated with any part other

than the DS1629. JP9, JP10, and JP13 will be added for

addresses other than “000”.

Figure 4.0 The Temperature Sensor Screen

Figure 5.0 DS1621 Device Access

TEMPERATURE SENSOR ALARMS

The Temperature High and Temperature Low Flags are set

and monitored in the Configuration Register. By writing to

A1h and A2h the user may set the Temp. High and Temp.

Low registers, respectively. When either alarm flag is set

in the Configuration Register, the alarm is detected by

software and the appropriate led(s) is (are) set from blue to

red accordingly to indicate an alarm condition.

The user may click the blue Temp. High and Temp. Low

arrows on the user interface to set the limits in the

appropriate registers (see Figure 6.0). Any click on these

arrows automatically writes to the corresponding register.

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