Provide galvanic isolation between the transmitter and receiver for enhanced electrical safety with ISO1450 and PIC18F57Q43

RS485 Isolator 4 Click is based on the ISO1450, an isolated half-duplex RS-485 transceiver from Texas Instruments. This transceiver is designed to provide galvanic isolation for RS-485 and RS-422 communication, offering robust noise immunity essential for harsh industrial environments. The ISO1450's bus pins are engineered to withstand high levels of electrostatic discharge (ESD) and electrical fast transients (EFT), eliminating the need for additional external components to ensure system-level protection. This capability makes the Click board™ ideal for industrial and commercial communication needs such as grid infrastructure, solar inverters, motor drives, HVAC systems, and building automation. With support for data rates up to 50Mbps, the ISO1450 enables long-distance communication while maintaining signal integrity. Its silicon-dioxide capacitive isolation barrier

provides a reliable 5kVRMS isolation for 1 minute, as per UL 1577 standards, and a working voltage of 1500VPK. This isolation feature breaks ground loops between communicating nodes, allowing a wider common-mode voltage range. The ISO1450's isolated side can operate over a broad supply voltage range of 3V to 5.5V, removing the need for a regulated supply on this side. The ISO1450 also includes advanced failsafe features to protect against invalid bus states, such as open bus conditions from broken cables, shorted bus conditions due to insulation breakdowns, and idle bus conditions where no driver is actively transmitting. This ensures reliable operation, even when communication lines encounter physical issues. In addition to the standard UART interface TX and RX pins from the mikroBUS™ socket, RS485 Isolator 4 Click also features receiver and

driver enable pins, routed to the RE and DE pins of the mikroBUS™. In this half-duplex implementation, the driver and receiver enable pins allow any connected node on the J1 header to be configured as either transmitting or receiving at any given moment. This flexibility reduces the need for additional cables since it allows dynamic switching between transmit and receive modes on the same communication line. 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.

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.