SSI Synchronous Serial Interface Master - Application Note

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The above implementation in figure 2.2 uses an opto-coupler together with a Schmitt-trigger buffer for the receiver stage and an RS-422 level translator for the transmitter. This version uses a 3.3 V supply instead of 5 V. The encoder contains a similar RS-422 transceiver stage. On the encoder side, CLK+ and CLK- are in-

  Triggers, Schmitt