DIGI POT 2 click
DIGI POT 2 click
IC/Module Texas Instruments TPL0501
(http://www.ti.com/lit/ds/symlink/tpl0501-
100.pdf)
Interface SPI (MISO, MOSI, SCK, CS)
Power
supply
3.3V, 5V
Website www.mikroe.com/click/digipot-2
(http://www.mikroe.com/click/digipot-2)
Schematic also available in PDF (http://cdn-
docs.mikroe.com/images/e/ea/DIGI_POT_2_click_s
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DIGI POT 2 click
From MikroElektonika Documentation
DIGI POT 2 click is a mikroBUS™ add-on board with a single channel digital potentiometer TPL0501
with 256 wiper positions. The IC has 100 kilo Ohms end-to-end resistance, with ±20% tolerance. The
board features two pairs of screw terminals for interfacing with the IC DIGI POT 2 click communicates
with the target MCU through the mikroBUS™ SPI pins (MISO, MOSI, SCK, CS). The board is
designed to use either a 3.3 or a 5V power supply.
Features and usage notes
Digital potentiometers are mixed signal devices
intended as replacements for mechanical
potentiometers. They can be used for consumer
electronics, adjustable power supplies, precision
calibration and sensor trimming.
The device has three terminals: High termianl, low
terminal and a wiper terminal which is in-between.
The wiper terminal is adjusted through SPI, moving
through the specified 256 steps.
DIGI POT click can operate in several
configurations:
◾ Voltage Divider mode
◾ Rheostat mode A
◾ Rheostat mode B
More details on each one can be found in the TPL0501 data sheet.
Digital potentiomenters can be have any kind of interface. Not just knobs like mechanical
potentiometers, but also buttons, capacitive inputs etc).
Another advantage of digital potentiometers is that you can create any desirable sweep profile (linear,
digital or any other function).
The operating temperature of TPL0501 is between -40ºC to 125ºC. ESD performance is tested per JESD 22 requirements (human body model).
DIGI POT 2 click can be used both with a 3.3V or a 5V power supply, as determined by the position of the onboard jumper (soldered to 3.3V position by
default).
Programming
The following code snippet shows a larger part of the DIGI POT 2 click example we supply:
void main() {
Delay_ms(100);
while (1) { // Endless loop
DigPot_CS =0; // Select PotentioMeter chip
SPI1_Write(0);
SPI1_Write(counter);
SPI1_Write(0x20);
SPI1_Write(counter);
DigPot_CS =1; // Deselect PotentioMeter chip
adc_value = ADC_Read(1); // Get 10-bit results of AD conversion
PORTD = (unsigned char)(adc_value >> 2);
if (PINB2_bit) // Press PB2 to decrease resistance between W and L
counter ++;
if (PINB3_bit) // Press PB3 to increase resistance between W and L
counter --;
Delay_ms(50); // Delay for debouncing
}
}
Code examples that demonstrate the usage of DIGI POT 2 click with MikroElektronika hardware, written for mikroC for are available on Libstock
(http://libstock.mikroe.com/projects/view/1825/digi-pot-2-click).
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