DIGI POT 14 Click

How does it work?

DIGI POT 14 Click is based on the TPL0102, a dual-channel digital potentiometer with non-volatile memory from Texas Instruments. It is a two-channel linear-taper digital potentiometer. Each potentiometer can be used as a three-terminal potentiometer or a two-terminal rheostat. When the TPL0102 is powered down, it saves the last values of wipers in EEPROM, and when the power is restored, the positions of wipers are loaded to their initial position. The TPL0102 features a fast power-up response time to wiper settings under 100μs, single-supply, and dual-supply operation ranges.

DIGI POT 14 Click uses a standard 2-Wire I2C interface to communicate with the host MCU and supports Standard and Fast mode with up to 400kHz of clock frequency. The I2C address can be set over the ADDR SEL jumpers, where 0 is set by default. Both potentiometers’ high, low, and wiper pins are tied to screw terminals, properly labeled as A and B sides.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on DIGI POT 14 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Software Support

We provide a library for the DIGI POT 14 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for DIGI POT 14 Click driver.

Key functions

• digipot14_reg_write DIGI POT 14 register write function.

• digipot14_set_pot_a_wiper DIGI POT 14 set the wiper position of potentiometer A function.

• digipot14_set_pot_b_wiper DIGI POT 14 set the wiper position of potentiometer B function.

Example Description

This library contains API for DIGI POT 14 Click driver. The demo application uses a digital potentiometer to change the resistance values.

void application_task ( void )  
 { 
     for ( uint8_t wiper_val = DIGIPOT14_MIN_POSITION; wiper_val <= DIGIPOT14_MAX_POSITION; wiper_val++ ) 
     { 

         digipot14_set_pot_a_wiper( &digipot14, wiper_val ); 
         digipot14_set_pot_b_wiper( &digipot14, wiper_val ); 
         log_printf( &logger, " Resistance = %.3f KOhm rn",  
                     ( DIGIPOT14_MAX_RESISTANCE_KOHM * ( wiper_val / DIGIPOT14_MAX_POSITION_NUM ) ) ); 
         Delay_ms( 1000 ); 
     } 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.DIGIPOT14

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.