Shop OBEX P1 Docs P2 Docs Learn Events
BS2 input impedance — Parallax Forums

BS2 input impedance

connolly113connolly113 Posts: 8
in BASIC Stamp
Trying to design a very low power circuit and need to use very large value pull-up resistors but cannot find the spec for the input impedance of the bs2 input pins to allow me to calculate that. I don't care about switching speed, just need the lowest possible current draw.

Comments

  • kwinnkwinn Posts: 8,697
    The PIC microcontroller is a CMOS chip so the input impedance is in the high megohm range. I have used 10Mohm resistors on a basic stamp and other cmos chips in a few cases. That may not be practical in some cases where there is electrical noise or static charges.
  • connolly113connolly113 Posts: 8
    Good info. My circuit will be very well protected from noise, so I will start with 1M and increase from there, thks
Sign In or Register to comment.