RS485 절연모듈 -ADM2763E
(RS485 ISOLATOR 3 CLICK)
개요
- 본 제품은 RS485 절연모듈 -ADM2763E입니다.
- 500kbps, 5.7kV RMS, 신호 절연 RS485 절연 트랜시버 ADM2763E 칩을 장착하고 있습니다.
- RS285신호 라인에서 회로를 보호하고자 할 경우 사용이 가능합니다.
특징
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HOW DOES IT WORK?
RS485 Isolator 3 Click Click is based on the ADM2763E, a 5.7kV RMS signal isolated RS-485 transceiver from Analog Devices. The ADM2763E is optimized for low speed over long cable runs and has a maximum data rate of 500kbps. It is protected against ≥±12 kV contact and ≥±15 kV air IEC 61000-4-2 electrostatic discharge (ESD) events on the RS485 receiver and driver terminal pins, easily accessible via the screw terminal blocks. The ADM2763E has four bus signals: signal A for the noninverting input signal, signal B for the inverting input signal, signal Y for the noninverting output signal, and signal Z for the inverting output signal, alongside a common ground connection.
Using coplanar transformer coils with an ON or OFF keying modulation scheme allows a high data throughput across the isolation barrier of the ADM2763E while minimizing radiation emissions. Architecture like this provides a digital isolator with immunity to common-mode transients >250 kV/μs across the device's full temperature and supply range. The ADM2763E also features a proprietary transmitter architecture with a low driver output impedance that increases the differential output voltage. The high differential output voltage extends the reach of the ADM2763E to longer cable lengths and makes this board suitable for PROFIBUS® nodes when powered with 5V on the isolated side of a supply (isolated-side provides the possibility of a supply voltage in the range from 3V to 5.5V).
Besides commonly used UART TX and RX pins on the mikroBUS™ socket, this board also has receiver and driver enable pins routed to the RE and DE pins of the mikroBUS™ socket. It also features a receiver cable invert pin, routed to the INV pin of the mikroBUS™ socket, to quickly correct the reversed cable connection on the A and B receiver bus pins while maintaining complete receiver fail-safe performance.
In addition, the ADM2763E has a built-in receiver fail-safe for the bus idle condition, accessible through some of the unpopulated onboard jumpers (the R4 and R5 pull-up resistors to the VDD2 isolated-side supply on the ADM2763E pins A and Y, as well as the R14 and R15 pull-down resistors to the GND2 common ground connection on pins B and Z). These resistors can be fitted if the user connects this board to other devices that require external biasing resistors on the bus. The ADM2763E also has a jumper that allows adding a 120Ω load to the RS485 receiver by placing the jumper cap on it.
This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VDD1 SEL jumper. This way, both 3.3V and 5V capable MCUs can use the 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,RS485 Applications Can be used for many industrial and automation applications that require insulation against working voltages of 1060V RMS and 1500VDC for the device's lifetime On-board modules ADM2763E - 5.7kV RMS signal isolated RS-485 transceiver from Analog Devices Key Features Low radiated emissions, receiver cable inversion smart feature, ESD protection on the RS485 A, B, Y, and Z bus pins, low speed 500kbps data rate, flexible power supply inputs, PROFIBUS® compliant for 5V VDD2, built-in receiver fail-safe for the bus idle condition, allows adding a 120Ω load to the RS485 receiver, and more Interface UART Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V