Step into the world of digital data with MCP3551 and PIC32MZ2048EFH100
Where analog meets digital
Published May 31, 2023
Click board™
ADC 2 Click
Dev.Board
Flip&Click PIC32MZ
Compiler
NECTO Studio
MCU
PIC32MZ2048EFH100
Don't let accuracy be a limiting factor in your data acquisition solutions – try our ADC today!
A
A
Hardware Overview
How does it work?
ADC 2 Click is based on the MCP3551, a 22-bit precise single-channel ΔΣ analog-to-digital converter from Microchip. The MCP3551 includes fully differential analog input on a VIN terminal, a third-order delta-sigma modulator, a fourth-order modified SINC decimation filter (allows superior averaging performance), an on-chip, low-noise internal oscillator, a power supply monitoring circuit, and an SPI digital interface. It can be easily used to measure low-frequency, low-level signals such as those found in pressure transducers, temperature, strain gauges, industrial control, or process control applications. This Click board™ communicates with MCU through a 3-Wire SPI interface (read-only) with a maximum frequency of 5MHz. The interface offers two conversion modes: A single Conversion mode for multiplexed
applications and a Continuous Conversion mode for multiple conversions in series, where every conversion is independent of each other (all internal registers are flushed between conversions). When the MCP3551 is not converting, it automatically goes into Shutdown mode, characterized by low power consumption. The MCP3551 provides single-cycle conversions with no digital filter settling time. Every conversion includes an internal offset and gain auto-calibration to reduce device error, which is transparent to the user and done in real-time during the conversion, allowing multiplexed applications. Like any ADC, the MCP3551 uses a reference voltage as the differential voltage range. The reference voltage level selection is performed by positioning the SMD jumper labeled as VREF
SEL to an appropriate position choosing between 3.3V or 5V provided by the mikroBUS™ power rails or 4.096V provided by MCP1541. These voltages may be used as the reference input that results in accuracy and stability. Besides, the ADC 2 Click supports an external power supply for the MCP3551, which can be connected to the input terminal labeled as VCC OUT and should be within the range of 2.7V to 5.5V. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the 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
Flip&Click PIC32MZ is a compact development board designed as a complete solution that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit PIC32MZ microcontroller, the PIC32MZ2048EFH100 from Microchip, four mikroBUS™ sockets for Click board™ connectivity, two USB connectors, LED indicators, buttons, debugger/programmer connectors, and two headers compatible with Arduino-UNO pinout. Thanks to innovative manufacturing technology,
it allows you to build gadgets with unique functionalities and features quickly. Each part of the Flip&Click PIC32MZ development kit contains the components necessary for the most efficient operation of the same board. In addition, there is the possibility of choosing the Flip&Click PIC32MZ programming method, using the chipKIT bootloader (Arduino-style development environment) or our USB HID bootloader using mikroC, mikroBasic, and mikroPascal for PIC32. This kit includes a clean and regulated power supply block through the USB Type-C (USB-C) connector. All communication
methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, user-configurable buttons, and LED indicators. Flip&Click PIC32MZ development kit allows you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
2048
Silicon Vendor
Microchip
Pin count
100
RAM (Bytes)
524288
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Flip&Click PIC32MZ as your development board.
Track your results in real time
Application Output
After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.
After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.
Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.
Software Support
Library Description
This library contains API for ADC 2 Click driver.
Key functions:
adc2_adc_Value_Read- Function is used to read specific data from ADC convertor.adc2_check_Over_Low- Function is used to check overflow low state.adc2_check_Over_High- Function is used to check overflow high state.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* \file
* \brief Adc2 Click example
*
* # Description
* This application enables usage of the 22bit ADC.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initalizes SPI driver and makes an initial log.
*
* ## Application Task
* This is an example that shows the capabilities of the ADC 2 click
*
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "adc2.h"
// ------------------------------------------------------------------ VARIABLES
static adc2_t adc2;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
adc2_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.
adc2_cfg_setup( &cfg );
ADC2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
adc2_init( &adc2, &cfg );
Delay_ms( 100 );
adc2_set_vref( &adc2, ADC2_VCC_3v3 );
log_printf( &logger, "------------------\r\n" );
log_printf( &logger, " ADC 2 Click \r\n" );
log_printf( &logger, "------------------\r\n" );
}
void application_task ( void )
{
float adc_val;
// Task implementation.
adc_val = adc2_read_adc_data( &adc2 );
log_printf( &logger, "Value : %.2f mV\r\n", adc_val );
if ( adc2.ovf_h )
log_printf( &logger, "HIGH OVERFLOW DETECTED\r\n" );
else if ( adc2.ovf_l )
log_printf( &logger, "LOW OVERFLOW DETECTED\r\n" );
log_printf( &logger, "------------------\r\n" );
Delay_ms( 500 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
