Description

TIDA-00179 is an EMC-compliant universal digital interface to connect to absolute position encoders like EnDat 2.2: BiSS®: SSI or HIPERFACE DSL®. This reference design supports a wide-input voltage range from 15 V to 60 V (24-V nom). A connector with 3.3-V logic I/O signals allows for direct interface to the host processor like Sitara AM437x or Delfino F28379 to run the corresponding master protocol.Master implementations are available on Sitara AM437x (EnDat2.2: BiSS and HIPERFACE DSL) or Delfino DesignDRIVE (EnDat2.2 and BiSS). This design allows the host processor to select between a 4-wire encoder interface like EnDat 2.2 and BiSS or a 2-wire interface with power over RS-485 like HIPERFACE DSL. To meet the selected encoder's supply range: the design offers a programmable output voltage with either 5.25 V or 11 V. The design's power supply offers protection against over-voltage and short circuit according to the selected encoder's voltage range to prevent damage during a cable short. TIDA-00179 has been tested up to 100-m cable length with EnDat 2.2 and 2-wire HIPERFACE DSL encoders.