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                                                                                                               Getting Started with the DS1840K . . .

10 of 13

The DS1847/48 memory page is
almost identical to the DS1845
memory page (see Figure 16).
The only difference is the
addition of the Table Select
option.  Before reading or
writing any memory, be certain
that you have selected the
memory which you intend to
read or write. The DS1847 only
has two “memories”, these
being the lookup table for
Resistor 0 and the lookup table
for Resistor 1.  The DS1848,
however, has both lookup
tables, as well as a user
EEPROM.

Figure 16.  DS1847/48 Memory page.

Proto Area

In order to provide the most flexibility, the DS1840K demo
board includes a proto area (see Figure 17).  Located in the
upper right corner is 20 by 12 grid in which you can add
your own circuitry.  Power and ground are conveniently
located at each edge of the proto area.

Figure 17.  Proto Area.

Содержание DS1840K

Страница 1: ...inated with banana plugs bench supply or modified wall wart transformer for operation of the kit The DS1840K also provides an oscillator buzzer circuit that allows you to hear the potentiometers Kit C...

Страница 2: ...buzzer depending on your jumper settings Figure 2 U1 Pin 1 Location 4 Connect the DS9123 serial port dongle to your PC 5 Now connect the cable 6 conductor from the DS9123 to the RJ 11 jack of the DS1...

Страница 3: ...ers are installed on J4 or J5 Measuring from Hx x being 0 for pot 0 or 1 for pot 1 to Lx you will see the end to end resistance of the pot For a DS1845 010 you would measure 10KOhms Measuring from Wx...

Страница 4: ...w you to hear the changes in resistance in case you do not have a multi meter handy This circuit is enabled disabled by DIP switch 5 labeled 555 ON To configure the circuit to work with the DS1845 set...

Страница 5: ...rature range For more detailed information please refer to the datasheet The physical device pins associated with resistor 0 are L0 and H0 Resistor 1 has its own pins L1 and H1 Notice that since these...

Страница 6: ...the Write Protect WP signal has an internal pull up resistor If the device is write protected then the wiper can not be moved and the memory can not be modified The defaultDIP switch settings for the...

Страница 7: ...S9123 not found then click on the radio button next to COM2 Then click Apply If the status box displays DS9123 ready you are ready to continue Otherwise if you are still experiencing difficulties refe...

Страница 8: ...lick on Write to Pot To read the pot setting click on Read Pot Another way to move the pot is by using the spin control up down arrows Click up or down until you reach the desired value Then click on...

Страница 9: ...000 Figure 14 2 Wire page The DS1847 48 page allows you to display the current temperature as well as the corresponding resistor values from the lookup tables In addition a fill tool is provided to si...

Страница 10: ...The DS1847 only has two memories these being the lookup table for Resistor 0 and the lookup table for Resistor 1 The DS1848 however has both lookup tables as well as a user EEPROM Figure 16 DS1847 48...

Страница 11: ...Getting Started with the DS1840K 11 of 13 DS1840K Demo Board Schematic Figure 17 DS1840K Demo Board Schematic...

Страница 12: ...with the DS1840K 12 of 13 Inside the DS9123 Serial Port Dongle Figure 18 DS9123 Schematic Check our FTP site for more DS9123 information to be added soon Contact information can be found at the end o...

Страница 13: ...orld Wide Web Site www dalsemi com Ordering Information www dalsemi com products ordering pdf FTP Site ftp ftp dalsemi com pub system_extension pots Datasheets www dalsemi com datasheets pdfindex html...

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