XF2485 module SMT

1 Overview

    The XF2485 is an RS-485 transceiver power IC with built-in on-off keying (OOK) modulation and demodulation functions , which can realize power line communication with zero peripheral circuitry. By modulating the data onto existing power lines, simultaneous power delivery and data communications are possible in the same pair of wires, significantly reducing system costs.

The OOK modulation frequency is 200kHz , and the bus wiring has no polarity, which can simplify system installation.

    The XF2485 module uses an integrated power chip and can work without peripheral circuits. The design is extremely simple and is widely used in lighting, building automation, factory automation and control, HVAC systems, electrical appliances, grid infrastructure, power transmission and other fields.

2 Features

l  Bus power supply current 0.1A ~ 12A , non-polar wiring, two lines solve communication and power supply at the same time

lRS  -485 electrical signal with on-off keying (OOK , 200kHz) modulation function , baud rate ≤ 9600bps

l  TX timeout protection to avoid bus congestion

lBus  I /O protection: ± 5kV ESD HBM , 2kV EFT

lCommunication  distance 500 meters

lBus  power supply range DC10 ~ 48V

3Simplified version schematic diagram

Figure 1 XF2485 simplified version schematic diagram

4 XF2485 and RS-485 comparison

5 pin definition

Figure 2 XF2485 module pin diagram

Table 1 XF2485 module pin description table

6Electrical parameters

Table 2 XF2485 module limit values

Table 3 XF2485 module ratings

7Typical application circuit

Supply supplies power to the bus and supplies power to the bus through two inductors L1 ;

Through 2 Ln inside the node , VOUT is output through the rectifier bridge and LDO linear regulator to power the XF2485 module. VOUT can also power the microcontroller to achieve non-polar power taking. A/B itself supports non-polar communication.

R is the bus data output, connected to the microcontroller RX , D is the bus data input, connected to the microcontroller TX .   

Figure 3 Typical application diagram

The selected value of bus inductance L1 ~ Ln is 33uH , please do not change its parameters.

8 module schematic diagram

Figure 4 XF2485 module schematic diagram

Table 4 XF2485 module bill of materials