Ensure seamless data transmission using ADuM341E and STM32L073RZ
SPI Isolator: The key to reliable data transmission
Published Feb 26, 2024
Click board™
SPI Isolator 4 Click
Dev. board
Nucleo-64 with STM32L073RZ MCU
Compiler
NECTO Studio
MCU
STM32L073RZ
This isolator allows you to bridge the gap between systems with different ground references, ensuring that data is transmitted accurately and without disruptions
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Hardware Overview
How does it work?
SPI Isolator 4 Click is based on the ADuM341E, a quad-channel digital isolator optimized for a serial peripheral interface from Analog Devices. This isolation component provides outstanding performance characteristics by combining high-speed and CMOS technology. It uses a high-frequency carrier to transmit data across the isolation barrier using iCoupler chip scale transformer coils separated by layers of polyimide isolation. Its data channels are independent and available in various configurations with a withstand voltage rating of 5kVrms. Using an ON/OFF keying (OOK) technique and the differential architecture, the ADuM341E has a very low propagation delay and high speed. It operates
with the external supply voltage ranging from 2.25V to 5.5V, providing compatibility with lower voltage systems and enabling voltage translation functionality across the isolation barrier. The ADuM341E architecture is designed for high common-mode transient (CMTI) immunity and high immunity to electrical noise and magnetic interference. Unlike other optocoupler alternatives, DC correctness is ensured without input logic transitions. Two different fail-safe options are available, by which the outputs go into a predetermined state when the input power supply is not applied or the inputs are disabled. SPI Isolator 4 Click communicates with an MCU using the SPI serial interface with a maximum data rate
of 100Mbps. This Click board™ also comes with an SDO line enable control pin, labeled as EN1, routed on the PWM pin of the mikroBUS™ socket. When EN1 is in a high logic state, the SDO line is enabled, and when EN1 is in a low logic state, the SDO line is disabled to the high-Z state. 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
Nucleo-64 with STM32L073RZ 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)
192
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
20480
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 STM32L073RZ MCU 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 SPI Isolator 4 Click driver.
Key functions:
spiisolator4_generic_write- SPI Isolator 4 data writing functionspiisolator4_generic_read- SPI Isolator 4 data reading function
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 main.c
* @brief SPIIsolator4 Click example
*
* # Description
* This library contains API for the SPI Isolator 4 click driver.
* This demo application shows an example of an SPI Isolator 4 click wired
* to the nvSRAM 4 click for reading Device ID.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization of SPI module and log UART.
* After driver initialization, the app sets the default configuration.
*
* ## Application Task
* This is an example that shows the use of an SPI Isolator 4 click board™.
* Logs Device ID of the nvSRAM 4 click wired to the SPI Isolator 4 board™.
* Results are being sent to the Usart Terminal where you can track their changes.
*
* ## Additional Function
* - static void get_device_id ( void )
*
* @author Mikroe Team
*
*/
#include "board.h"
#include "log.h"
#include "spiisolator4.h"
static spiisolator4_t spiisolator4;
static log_t logger;
static uint32_t device_id;
static void get_device_id ( void ) {
uint8_t rx_data[ 4 ];
spiisolator4_generic_read( &spiisolator4, 0x9F, &rx_data[ 0 ], 4 );
device_id = rx_data[ 0 ];
device_id <<= 8;
device_id |= rx_data[ 1 ];
device_id <<= 8;
device_id |= rx_data[ 2 ];
device_id <<= 8;
device_id |= rx_data[ 3 ];
}
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
spiisolator4_cfg_t spiisolator4_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.
spiisolator4_cfg_setup( &spiisolator4_cfg );
SPIISOLATOR4_MAP_MIKROBUS( spiisolator4_cfg, MIKROBUS_1 );
err_t init_flag = spiisolator4_init( &spiisolator4, &spiisolator4_cfg );
if ( SPI_MASTER_ERROR == init_flag )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
spiisolator4_default_cfg ( &spiisolator4 );
log_info( &logger, " Application Task " );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 100 );
}
void application_task ( void )
{
get_device_id( );
log_printf( &logger, " Device ID : 0x%.8LX\r\n", device_id );
log_printf( &logger, "--------------------------\r\n" );
Delay_ms( 1000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
