Product Information

410-239P-KIT

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Datasheet
Digital Potentiometer Development Tools PmodDPOT - Digital Potentiometer

Manufacturer: Digilent
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410-239P-KIT
Digilent

1 : USD 16.4892

     
Manufacturer
Digilent
Product Category
Digital Potentiometer Development Tools
RoHS - XON
Y Icon ROHS
Product
Add - On Boards
Tool Is For Evaluation Of
Ad5160
Operating Supply Voltage
3.3 v , 5 V
Packaging
Bulk
Resistance Range
10 kOhms
Description/Function
Compatible Host Board To Control A Digital Potentiometer
Series
Pmod
Brand
Digilent
Interface Type
3 - Wire, Spi
For Use With
Ad5160
Factory Pack Quantity :
1
Cnhts
8543709991
Hts Code
8473301180
Mxhts
84733001
Product Type
Digital Potentiometer Development Tools
Subcategory
Development Tools
Taric
8473302000
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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodDPOT Reference Manual Revised April 8, 2016 This manual applies to the PmodDPOT rev. A Overview The Digilent PmodDPOT is a digital potentiometer allowing users to set a desired resistance anywhere from 60 to a nominal 10 k. Featu res include: Digital potentiometer with 8-bit resolution Select desired resistance from 60 to 10 k 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 The PmodDPOT. 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 and 9961 can be programmed. The wiper terminal has an internal resistance of 60 . 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. Copyright Digilent, Inc. All rights reserved. DOC : 502-239 Page 1 of 2 Other product and company names mentioned may be trademarks of their respective owners. PmodDPOT Reference Manual Equations for the programmable resistance values and output voltages are provided from the AD5160 datasheet below: D R ()D R R WB AB W 256 Here, RAB represents the nominal resistance of 10 k and RW is the wiper terminal resistance of 60 . 256 D R ()D R R WA AB W 256 Here, R represents the nominal resistance of 10 k and R is the wiper terminal resistance of 60 . AB W R (D) R (D) WB WA V()DV V W A B 256 256 Here, R and R are the resistances calculated in the two above equations and VA and VB are the voltages WA WB applied at terminals A and B, respectively. Care must be taken to ensure that current flow between the wiper terminal and either terminal A or B must be limited to a pulsed 20mA or a continuous 4.7mA so that the power dissipation capabilities of the on-board chip is not exceeded. 2.1 Pinout Description Table Pin Signal Description 1 ~CS Chip Select 2 MOSI Master-In-Slave-Out 3 (NC) Not Connected 4 SCLK Serial Clock 5 GND Power Supply Ground 6 VCC Power Supply (3.3V/5V) Any external power applied to the PmodDPOT must be within 2.7V and 5.5V however, it is recommended that Pmod is operated at 3.3V. Users must also ensure that any voltage applied to the outside terminals is between GND and VCC. 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 0.9 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header. Copyright Digilent, Inc. All rights reserved. Page 2 of 2 Other product and company names mentioned may be trademarks of their respective owners.

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