DS1802 Digital Potmeter
Controlling a Dallas DS1802 by an AT90S1200 with a normal potentiometer

Digital Controlled Potmeter: (also known as XDCP 's or Digipots) With this circuit you're able to control a Dallas DS1802 digipot with a normal potmeter. The DS1802 has 64 wiper positions (6bit), each step is -1dB attentuation, and is controlled by serial data, thus easy to steer with a microcontroller.

Part list: 1x AT90S1200 1x DS1802 (Dallas) 1x 78L05 1x 8MHz ceramic resonator 1x 22pF 1x 47uF/16V 1x 47n polycarbonate 4x 100n multilayer 1x 100 ohm 1x 10k ohm 1x 820 ohm 1x 100k trimpot 1x 10k lin. potmeter

The software.... Here you can download the datasheet of the DS1802. Here the hex-dump (GNU). You can upload this hex data into the AVR with this programmer.

DS1669 Digital Potmeter UP/DOWN
Controlling a Dallas DS1669 by an AT90S1200 with a normal potentiometer




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DS1669 Digital Control: With this circuit you're able to control a Dallas DS1669 digipot with a normal potmeter. Usually you control the DS1669's wiper with 2 push buttons (up/down) Disadvantage: Slight delay.

Part list: 1x AT90S1200-12PI 1x DS1669 (Dallas) 1x 78L05 2x 1N4007 1x 4MHz X-tal 2x 27pf 1x 22pF 1x 47uF/16V 1x 100n polycarbonate 3x 100n multilayer 1x 100 ohm 1x 10k ohm 1x 820 ohm 1x 100k trimpot 1x 10k lin. potmeter

The software.... Here you can download the datasheet of the DS1669. Here the hex-dump (GNU). You can upload this hex data into the AVR with this programmer.