Mikroelektronika d.o.o.
SPI Isolator 3 Click Board
SPI Isolator 3 Click Board
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The SPI Isolator 3 Click Board™ is a compact add-on board that contains a digital isolator optimised for a serial peripheral interface. This board features the MAX14483, a 6-channel 3.75kVRMS digital galvanic isolator with a very low propagation delay on the SDI, SDO, and SCLK channels from Maxim Integrated. Besides a second enable control input, which allows MAX14483 to isolate multiple SPI devices, and an auxiliary channel available for passing timing or control signals from the master side to the slave side, the MAX14483 also possesses power monitors provided for both power domains to signal if the opposite side of the isolator is ready for operation.
Thus, the SPI Isolator 3 Click Board™ is suitable for general SPI-bus isolation and industrial, process, building automation, programmable logic controllers, and many more.
How Does The SPI Isolator 3 Click Board™ Work?
The SPI Isolator 3 Click Board™ as its foundation uses the MAX14483, a 6-channel 3.75kVRMS digital isolator with a very low propagation delay on the SDI, SDO, and SCLK channels from Analog Devices. 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. The wide supply voltage range of both power pins 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 Maxim'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.
The SPI Isolator 3 Click Board™ communicates with MCU using the SPI serial interface with a maximum data rate of 200 Mbps. This Click board™ also comes with a SDO line enable control pin, labelled 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 labelled as FLT to detect error outputs from other devices.
Besides an auxiliary channel, labelled 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 longer 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 is operating normally. When Side A or Side B is not powered, SAA or SBA is set low, and all outputs are set to their default state.
The SPI Isolator 3 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the SPI 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.
SPECIFICATIONS
| Type | Isolators, SPI |
| Applications | Can be used for general SPI-bus isolation and the industrial, process, and building automation, in programmable logic controllers, and many more. |
| On-board modules | MAX14483 - 6-channel 3.75kVRMS digital isolator with a very low propagation delay on the SDI, SDO, and SCLK channels from Maxim Integrated |
| Key Features | Low power consumption, 6 isolated channels, low propagation delay on SCLK, SDI, and SDO lines, robust galvanic isolation of digital signals, shared interrupt feature, auxiliary channel for timing or control, and more. |
| Interface | SPI |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 3.3V or 5V,External |
PINOUT DIAGRAM
This table shows how the pinout of the SPI Isolator 3 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Power Monitoring | SAA | 1 | AN | PWM | 16 | AUX | Auxiliary Signal for Timing or Control |
| SPI SDO Signal Enable | OEN | 2 | RST | INT | 15 | FLT | Interrupt |
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | NC | |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | NC | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| LD2 | FLT | - | Fault LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
SPI ISOLATOR 3 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage VCC | 3.3 | - | 5 | V |
| External Supply Voltage VIN | 1.71 | - | 5.5 | V |
| Isolation Voltage | - | - | 3750 | Vrms |
| Data Rate | - | - | 200 | Mbps |
| Operating Temperature Range | -40 | +25 | +125 | °C |
Software Support
We provide a library for the SPI Isolator 3 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on mikroE Github account.
Library Description
This library contains API for the SPI Isolator 3 Click Board™ driver.
Key Functions
spiisolator3_cfg_setup- Config Object Initialization function.spiisolator3_init- Initialization function.spiisolator3_default_cfg- Click Default Configuration function.
Example Description
This library contains API for the SPI Isolator 3 Click Board™ driver. This demo application shows an example for the SPI Isolator 3 Click Board™ wired to the nvSRAM 4 Click Board™ for reading Device ID.
The demo application is composed of two sections :
void application_task ( void ) {
get_device_id( );
log_printf( &logger, " Device ID : 0x%.8LXrn", device_id );
Delay_ms( 1000 );
}
Additional Function
get_device_id- Get Device ID function.
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on mikroE Github account.
Other mikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.SpiIsolator3
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The SPI Isolator 3 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Software Support
We provide a library for the SPI Isolator 3 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on mikroE Github account.
Library Description
This library contains API for the SPI Isolator 3 Click Board™ driver.
Key Functions
spiisolator3_cfg_setup- Config Object Initialization function.spiisolator3_init- Initialization function.spiisolator3_default_cfg- Click Default Configuration function.
Example Description
This library contains API for the SPI Isolator 3 Click Board™ driver. This demo application shows an example for the SPI Isolator 3 Click Board™ wired to the nvSRAM 4 Click Board™ for reading Device ID.
The demo application is composed of two sections :
void application_task ( void ) {
get_device_id( );
log_printf( &logger, " Device ID : 0x%.8LXrn", device_id );
Delay_ms( 1000 );
}
Additional Function
get_device_id- Get Device ID function.
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on mikroE Github account.
Other mikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.SpiIsolator3
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The SPI Isolator 3 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
SPI Isolator 3 Click Board
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