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Original question:

MC3486: internal PU high in input/out

MC3486: MC3486

Na Aj
Prodigy 10 points
Part Number: MC3486
Other Parts Discussed in Thread: AM26C32, AM26LV32E

Hello

I want to buy this IC to read data from the Encoder. I am designing a schematice and pcb for my project so i want to know which component should add between encoder to MC3486 an between output pin to MCU.

i read a lot of pag about my question but i need your suggestions.

for example some people add a resistor 100 OHm to 120 OHm between ( A and A-) but i saw the other please share here a sutible schematice file it is very better for us.

how can I decrease the level of 5 volt output to 3.3to connect MCU. 

best regards

  • 0
    TI__Mastermind 25705 points

    Hi,

    First of all, this app note is a good resource for many common questions.

    www.ti.com/.../slla272c.pdf

    The purpose of applying termination resistors is to match cable impedance and reduce signal reflection. This practice is highly recommended especially in high speed and long distance applications.

    3.3V and 5V RS-485 transceivers can be deployed on the same bus. Here is the detailed discussion.

    e2e.ti.com/.../93260

    If you're interested, TI has some other options for quadruple receivers, like AM26C32, AM26LV32E. You can browse the choice here.

    http://www.ti.com/rs485

    Please let me know if you have more questions.

    Regards,

    Hao