Create a highly compact, high-performance DAQ solution with ADAQ7768-1 and STM32F091RC
Streamline data collection - save time and effort
Published Feb 26, 2024
Click board™
DAQ Click
Dev Board
Nucleo-64 with STM32F091RC MCU
Compiler
NECTO Studio
MCU
STM32F091RC
Simplify complex data acquisition challenges with our user-friendly solution
A
A
Hardware Overview
How does it work?
DAQ Click is based on the ADAQ7768-1, a 24-bit precision data acquisition μModule system that encapsulates signal conditioning, conversion, and processing blocks into one SiP from Analog Devices, enabling rapid development of highly compact, high-performance precision DAQ systems. The ADAQ7768-1 consists of low noise, high bandwidth programmable gain instrumentation amplifier (PGIA) capable of amplifying and attenuating while maintaining high input impedance. Also, it has a linear phase anti-aliasing filter, a high-performance 24-bit sigma-delta ADC with a programmable digital filter, a low dropout linear regulator, reference buffers, and critical passive components required for the signal chain. The wide common-mode input range of the ADAQ7768-1 allows it to accept a wide variety of signal swings. It supports a fully differential input signal connection with a maximum voltage range of ±12V with an excellent common-mode rejection ratio. The input signal is fully buffered with a low input bias current, enabling the ADAQ7768-1 to directly interface to sensors with high output impedance. The ADAQ7768-1‘s PGA requires a voltage of ±15V to supply the frontend amplifiers. Therefore, a dual-channel low-noise bias generator, the LT3095 from Analog Devices, provides a +15V out of 3V3 mikroBUS™ rail.
A -15V supply is obtained by combining a step-down regulator ADP2300 and a small low-noise LDO ADP7182, both from Analog Devices, also out of 3V3 mikroBUS™ rail. The PGIA has six gain settings capable of varying input ranges from ±0.197V to ±12.603V fully differential input signal, which can be configured with GAIN pins controlled by three multifunction GPIO pins of the ADAQ7768-1 (MODE1-3). An integrated 4th-order low-pass analog filter combined with the user-programmable digital filter ensures the signal chain is fully protected against the high-frequency noise and out-of-band tones presented at the input node. This filter is designed to achieve high phase linearity and maximum in-band magnitude response flatness. Inside the ADAQ7768-1 is a high-performance, 24-bit precision, single-channel Sigma-Delta converter with excellent AC performance and DC precision and throughput rate of 256kSPS from a 16.384MHz onboard crystal (clock source). In addition to the internal clock source, the user can use an external clock brought to the connector labeled as EXT CLK. The clock source is selected by positioning a jumper marked as INT/EXT. Since the LT3095 generates two independent supplies, in addition to -15V, this regulator also provides the 5.3V voltage required to power the internal LDO of the ADAQ7768-1, whose output
supplies an onboard voltage reference - the ADR4540. This Click board™ also allows the user to filter the reference voltage itself, with the optional use of a reference buffer implemented using OpAmp, ADA4807-1, which provides high-speed performance with DC precision, low noise distortion, and power to maintain the accuracy of the reference. This Click board™ communicates with MCU through a standard SPI interface to program the internal registers for complete control of the ADAQ7768-1. In addition, it uses several GPIO pins, such as the reset pin routed to the RST pin on the mikroBUS™ socket, which with a low logic level puts the module into a Reset state, an additional data-ready signal, routed on the INT pin of the mikroBUS™ socket labeled as RDY, indicating that new data is ready for the host, and one extra user-configurable general-purpose I/O pin labeled as IO3 routed to the PWM pin on the mikroBUS™ socket. This Click board™ can only be operated with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Features overview
Development board
Nucleo-64 with STM32F091RC MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
256
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
32768
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
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 Nucleo-64 with STM32F091RC MCU as your development board.
Track your results in real time
Application Output via Debug Mode
1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.
2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.
Software Support
Library Description
This library contains API for DAQ Click driver.
Key functions:
daq_set_gainSet gain range.daq_read_dataReading adc data.daq_calculate_voltageConvert data from raw ADC to voltage.
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 main.c
* @brief DAQ Click example
*
* # Description
* This example showcases ability of the device to read ADC
* data and calculate voltage for set configuration.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization of communication modules (SPI, UART) and
* additional pins for controling device. Resets device and
* then configures default configuration and sets read range
* by setting gain to +-12V. In the end reads vendor and
* device ID to confirm communication.
*
* ## Application Task
* Reads ADC data and calculates voltage from it, every 0.3 seconds.
*
* @author Luka Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "daq.h"
static daq_t daq;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
daq_cfg_t daq_cfg; /**< Click config object. */
/**
* 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.
daq_cfg_setup( &daq_cfg );
DAQ_MAP_MIKROBUS( daq_cfg, MIKROBUS_1 );
err_t init_flag = daq_init( &daq, &daq_cfg );
if ( SPI_MASTER_ERROR == init_flag )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
if ( daq_default_cfg ( &daq ) )
{
log_error( &logger, " Default configuration. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
uint8_t id = 0;
daq_generic_read( &daq, DAQ_REG_VENDOR_H, &id, 1 );
log_printf( &logger, " > Vendor: \t0x%.2X", ( uint16_t )id );
daq_generic_read( &daq, DAQ_REG_VENDOR_L, &id, 1 );
log_printf( &logger, "%.2X\r\n", ( uint16_t )id );
daq_generic_read( &daq, DAQ_REG_PRODUCT_ID_H, &id, 1 );
log_printf( &logger, " > ID: \t\t0x%.2X", ( uint16_t )id );
daq_generic_read( &daq, DAQ_REG_PRODUCT_ID_L, &id, 1 );
log_printf( &logger, "%.2X\r\n", ( uint16_t )id );
Delay_ms( 1000 );
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
int32_t adc_data = 0;
float voltage = 0.0;
daq_read_data( &daq, &adc_data );
daq_calculate_voltage( &daq, adc_data, &voltage );
log_printf( &logger, " > Data: %ld\r\n", adc_data );
log_printf( &logger, " > Voltage: %.2f\r\n", voltage );
log_printf( &logger, "***********************************\r\n" );
Delay_ms( 300 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
