Safeguard your electronic systems with MAX14483 and PIC18F57Q43, enabling them to function without interference
Ensuring safety and signal integrity with SPI isolator
Published Feb 13, 2024
Click board™
SPI Isolator 3 Click
Dev. board
Curiosity Nano with PIC18F57Q43
Compiler
NECTO Studio
MCU
PIC18F57Q43
Our SPI isolator is instrumental in applications where you need to maintain signal integrity, reduce electromagnetic interference, and protect sensitive components from electrical disturbances
A
A
Hardware Overview
How does it work?
SPI Isolator 3 Click is based on the MAX14483, a 6-channel 3.75kVRMS digital isolator from Analog Devices with a very low propagation delay on the SDI, SDO, and SCLK channels. It provides galvanic isolation for digital signals transmitted between two ground domains. The device withstands up to 560Vpeak of continuous isolation and up to 3.75kVRMS for up to 60 seconds. Both power pins' wide supply voltage range allows the MAX14483 to be used for level translation and isolation. The MAX14483 offers low-power operation, high electromagnetic interference immunity, and stable temperature performance through Analog's proprietary process technology. The device isolates different ground domains and blocks high-voltage/high-current transients from sensitive or human interface circuitry. It also features an internal refresh circuit to ensure output accuracy
when an input remains in the same state indefinitely. SPI Isolator 3 Click communicates with MCU using the SPI serial interface with a maximum data rate of 200 Mbps. This Click board™ also comes with an SDO line enable control pin, labeled as OEN and routed on the RST pin of the mikroBUS™ socket, allowing MAX14483 to isolate multiple SPI devices. It also has a red LED indicator labeled as FLT to detect error outputs from other devices. Besides an auxiliary channel, labeled as AUX, available for passing timing or control signals from the master side to the slave side, the MAX14483 also possesses power monitors for both power domains to signal if the opposite side of the isolator is ready for operation. The FLT and AUX channels are designed to support SPI devices that require control signals beyond the standard 4-wire SPI bus. Each channel
is unidirectional; it only passes data in one direction with a maximum data rate of 25Mbps. The monitor channels (SAA, SBA) are designed to pass DC signals and have significantly larger propagation delays than other channels, meaning they should not be used for data signals. SAA and SBA are set high when their respective opposite side of the isolator has power and operates normally. When Side A or B is not powered, SAA or SBA is set low, and all outputs are set to their default 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
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 SPI Isolator 3 Click driver.
Key functions:
spiisolator3_generic_write- SPI Isolator 3 data writing functionspiisolator3_generic_read- SPI Isolator 3 data reading functionspiisolator3_get_fault- SPI Isolator 3 get fault state 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 SpiIsolator3 Click example
*
* # Description
* This library contains API for the SPI Isolator 3 click driver.
* This demo application shows an example of an SPI Isolator 3 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 3 click board™.
* Logs Device ID of the nvSRAM 4 click wired to the SPI Isolator 3 board™.
* Results are being sent to the Usart Terminal where you can track their changes.
*
* @note
* void get_device_id ( void ) - Get Device ID function.
*
* @author Nenad Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "spiisolator3.h"
static spiisolator3_t spiisolator3;
static log_t logger;
static uint32_t device_id;
void get_device_id ( void ) {
uint8_t rx_data[ 4 ];
spiisolator3_generic_read( &spiisolator3, 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. */
spiisolator3_cfg_t spiisolator3_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.
spiisolator3_cfg_setup( &spiisolator3_cfg );
SPIISOLATOR3_MAP_MIKROBUS( spiisolator3_cfg, MIKROBUS_1 );
err_t init_flag = spiisolator3_init( &spiisolator3, &spiisolator3_cfg );
if ( init_flag == SPI_MASTER_ERROR ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
spiisolator3_default_cfg ( &spiisolator3 );
log_info( &logger, " Application Task " );
Delay_ms( 100 );
}
void application_task ( void ) {
get_device_id( );
log_printf( &logger, " Device ID : 0x%.8LX\r\n", device_id );
Delay_ms( 1000 );
}
void main ( void ) {
application_init( );
for ( ; ; ) {
application_task( );
}
}
// ------------------------------------------------------------------------ END
