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PmodDPOT™ Reference Manual
Revised April 8, 2016
This manual applies to the PmodDPOT rev. A
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Overview
The Digilent PmodDPOT is a digital potentiometer allowing users to set a desired resistance anywhere from 60 to a
nominal 10 kΩ.
1 Functional Description
The PmodDPOT utilizes Analog Devices AD5160 to digitally set a desired resistance between two terminals. With
256 possible step values, a resistance between 60 Ω and 9961 Ω can be programmed. The wiper terminal has an
internal resistance of 60 Ω.
2 Interfacing with the Pmod
The PmodDPOT communicates with the host board via the SPI protocol. By bringing the Chip Select (CS) line low,
users may then provide 8-bits of data on the falling Serial Clock (SCLK) edge in SPI Mode 0. Once the 8 bits of data
have been transferred, the rising edge of the CS line loads the data into the internal register DAC, whereupon the
resistance between terminals is set.
The PmodDPOT can be utilized in two different styles: a rheostat where users set a desired resistance between one
outside terminal and the wiper terminal or in a voltage divider mode where the two outside terminals are powered
at set voltages and a ratio of resistance is specified.
Digital potentiometer with 8-bit resolution
Select desired resistance from 60 Ω to 10 kΩ
Small PCB size for flexible designs 0.9“ × 0.8” (2.3 cm × 2.0
cm)
6-pin Pmod port with SPI interface
Follows Digilent Interface Specification Type 2
