Kirk Wallace wrote: > This is getting messy. I made a first attempt at a schematic of a single > encoder setup. It should be attached. Also, the Inkscape SVG file is > attached if someone wants to edit it. There are some missing bits, such > as, how each component gets powered and grounded. I assumed the driver > cable is used because 2ma just doesn't seem enough to drive the inputs > well. Another message indicated an AMT102, so I used that, but makes > little difference. > The difference between the 102 and 103 is the angle that the connector comes out of the encoder body. Electrically, they are the same. > The USC encoder inputs go directly to the FPGA or a buffer? Any > hysteresis? Any pull ups? > The USC inputs are TI logic level translator chips, I don't think they have any hysteresis. There are no pull-ups or pull-downs. For open-collector encoders you need to provide pull-up resistors. > The Gecko encoder inputs go directly to a PNP base, maybe with a voltage > divider? Any hysteresis? Pull ups? > No pull-up or hysteresis. PNP transistor collector is grounded, base is connected to encoder signal with 4.7K resistor, emitter goes to cathode of opto-isolator LED. Anode of LED goes to +5V through resistor.
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