Description

EMC immunity: especially immunity against inverter switching noise: is important for positioning encoder feedback systems of industrial drives. This design demonstrates a high EMC immunity RS485 transceiver solution which can be used on both the drive and encoder: such as Tamagawa™: EnDat 2.2: BiSS®: and so forth. The design supports a wide input voltage of 5 V. A connector with 3.3-V logic I/O signals and a 3.3-V power supply allows direct interface with the host processor to run the master protocol and power the processor. To meet the supply range of the selected encoder: the design offers an output voltage to the encoder equal to the Vin. This design’s power supply offers protection against overvoltage and short circuit: according to the selected encoder’s voltage range: to prevent damage during a cable short. The design has been tested for up to a 50-m cable length with the Tamagawa encoder.