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USB to TTL isolated interface

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HighTechPower

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Hi. I'm using FT232RL and Si8621 as isolated interface USB to microcontroller UART in my upcoming programmable dc electronic load project. Plz attached here find the schematic. While ordering Si8621 in SOIC-8 package I have found it comes in two varieties of default output state. One is active low while other is active high as below,
Si8621BC-B-IS (active low default output state)
Si8621EC-B-IS (active high default output state)
Which one I need for pic microcontrollers interface (PIC16F877A & PIC16F690)
Also correct me if there is something wrong with the schematic before going to PCB layout.
Plz attached here find Si8621 datasheet as well.
 

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  • USB TO TTL ISOLATED INTERFACE.pdf
    236 KB · Views: 50
  • Si8610BB-B-IS-SiliconLaboratories.pdf
    896.2 KB · Views: 43

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