Enhance your designs with the next level of precision with MCP41HV51 and PIC18F57Q43
Code your resistance
Published Feb 13, 2024
Click board™
DIGI POT 6 Click
Dev. board
Curiosity Nano with PIC18F57Q43
Compiler
NECTO Studio
MCU
PIC18F57Q43
Seamlessly bridge analog and digital realms using our digital potentiometer technology, harmonizing control and responsiveness for superior outcomes
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Hardware Overview
How does it work?
DIGI POT 6 Click is based on the MCP41HV51, 8-bit dual power rails digital potentiometer with SPI serial interface and volatile memory from Microchip. It has a wide operating voltage range, analog from 10 to 36V and digital from 2.7 to 5.5V, or is implemented as a dual-rail (±18V) for systems requiring wide signal swing or high power-supply voltages. It supports resistor configurations of 255 resistors and 256 steps and high terminal/wiper current, including the ability to sink/source up to 25mA on all terminal pins for driving larger loads. The resistor network of the MCP41HV51 has an 8-bit resolution where each resistor network allows
Zero-Scale to Full-Scale connections. All these features, combined with an extended temperature range, make the MCP41HV51 well-suited for a broad range of high-voltage and high-temperature applications, including those in the industrial, automotive, and audio markets. DIGI POT 6 click communicates with MCU using the SPI serial interface with a maximum frequency 10MHz and supports the two most common SPI modes, 0 and 3. This Click board™ also has three terminals labeled P0A, P0B, and P0W, with an internal architecture comprising various resistances and switches. The resistance between
terminals A and B, RAB, commonly called the “end-to-end” resistance, provides RAB resistance options up to 100 kΩ. In contrast, the wiper terminal, P0W, is digitally programmable to access any 2n tap points on the resistor string. 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.
Features overview
Development board
PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive
mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI
GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC
MCU Memory (KB)
128
Silicon Vendor
Microchip
Pin count
48
RAM (Bytes)
8196
You complete me!
Accessories
Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F57Q43 as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for DIGI POT 6 Click driver.
Key functions:
digipot6_read_data- This function reads data from the specified register addressdigipot6_write_wiper_cmd- This function writes a wiper configuration command to the click moduledigipot6_set_resistor- This function reads data from the specified register address
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* \file
* \brief DIGIPOT6 Click example
*
* # Description
* This example showcases how to initialize, configure and use the DIGI POT 6 click module. The
* click is a digital potentiometer. The potentiometer has a programmable wiper which controls
* the resistance between P0W-POA and POW-POB. An external power supply is required for this example.
*
* The demo application is composed of two sections :
*
* ## Application Init
* This function initializes and configures the logger and click modules. This function also sets
* the click default configuration.
*
* ## Application Task
* This function programs the wiper position and shows the current wiper position in the UART
* console every second.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "digipot6.h"
// ------------------------------------------------------------------ VARIABLES
static digipot6_t digipot6;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
digipot6_cfg_t cfg;
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
digipot6_cfg_setup( &cfg );
DIGIPOT6_MAP_MIKROBUS( cfg, MIKROBUS_1 );
digipot6_init( &digipot6, &cfg );
Delay_100ms( );
digipot6_default_cfg( &digipot6 );
Delay_100ms( );
}
void application_task ( void )
{
uint8_t wiper;
uint16_t cnt;
for ( cnt = 0; cnt <= 255; cnt += 15 )
{
digipot6_write_data( &digipot6, DIGIPOT6_VOLATILE_WIPER_0, cnt );
Delay_ms( 10 );
wiper = digipot6_read_data( &digipot6, DIGIPOT6_VOLATILE_WIPER_0 );
log_printf( &logger, " * Wiper position: %u *\r\n", ( uint16_t ) wiper );
Delay_ms( 1000 );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
