DIGITAL Potentiometer
All Mikroelektronika’s development systems feature a large number of peripheral
modules expanding microcontroller’s range of application and making the
process of program testing easier. In addition to these modules, it is also
possible to use numerous additional modules linked to the development system
through the I/O port connectors. Some of these additional modules can operate
as stand-alone devices without being connected to the microcontroller.
™
Manual
Additional Board
MikroElektronika
DIGITAL Potentiometer Additional Board
The
DIGITAL Potentiometer
additional board is used for digital resistance regulation. Resistance regulation is performed via SPI
communication between the additional board and the microcontroller supplied on a development system. The board is connected to
a development system via a 2x5 female connector on the additional board and a 2x5 male connector on the development system.
Depending on the development system to be connected to the additional board, it is necessary to set the appropriate switches on the DIP
switch SW1 to the ON position. Screw terminals CN2 and CN3 are used to connect the potentiometer to a controlled device (for example,
audio amplifier’s volume regulation). Next to these connectors, there are pins the marks of which have the following meanings:
PA
PW
PB
- potentiometer terminal A connection;
- potentiometer wiper connection; and
- potentiometer terminal B connection.
MCP41010 circuit is a
digital potentiometer
Connectors used to connect the
additional board to a controlled device
Figure 1:
DIGITAL Potentiometer
additional board
DIP switch SW1 is used to turn on MOSI, SCK and CS lines that connect a microcontroller and the aditional board.
When the
DIGITAL Potentiometer
board is connected to EasyPIC, LV18F, EasyLV-18F, Easy24-33 and BigPIC development systems,
the following switches on the DIP switch SW1 should be set to the ON position:
SW1-1 -> MOSI
SW1-4 -> SCK
For EasyAVR and Easy8051 development systems, the following switches should be set to the ON position:
SW1-3 -> MOSI
SW1-6 -> SCK
For the EASYdsPIC development system, the following switches on the DIP switch SW1 should be set to the ON position:
SW1-2 -> MOSI
SW1-5 -> SCK
The
DIGITAL Potentiometer
additional board is capable of regulating up to 10k resistance.
2x5 female connector enables
connection with development systems
Figure 2:
Back of the
DIGITAL Potentiometer
additional board
MikroElektronika
Figure 3:
DIGITAL Potentiometer
additional board connected to a development systems
The function of MCP41010 circuit’s pins is as
follows:
CS
SCK
MOSI
PA
PW
PB
- Chip select
- Serial Clock
- Serial Data Input
- Potentiometer terminal A connection
- Potentiometer wiper connection
- Potentiometer terminal B connection
Figure 4:
DIGITAL Potentiometer
additional board connection schematic
MikroElektronika
MikroElektronika
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