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TCS3200-db resistors — Parallax Forums

TCS3200-db resistors

bkirkbkirk Posts: 37
edited 2014-05-01 12:37 in Accessories
The schematic drawing shows that the daughterboard is using 33K pull-up resistors for S0 and S1. Is it possible to use lower resistors, though? Any idea how I would calculate the minimum necessary with a 3.7v supply? I'm having trouble finding a 33k resistor in the right SMD package, so would like more flexibility to use a lower value. Thanks.

Ben

Comments

  • LeonLeon Posts: 7,620
    edited 2014-04-29 10:39
    Where is the schematic?
  • PublisonPublison Posts: 12,366
    edited 2014-04-29 10:48
    Leon wrote: »
    Where is the schematic?

    Last page of the docs.
    pdf
    pdf
    28302-TCS3200-doc.pdf
    256K
  • PublisonPublison Posts: 12,366
    edited 2014-04-29 10:52
    Are you trying to modify to current design, (board), or making your own board?
  • kwinnkwinn Posts: 8,697
    edited 2014-04-29 13:14
    Yes, you can use lower value resistors as long as you don't go a lot lower. These are pullup resistors for digital signals, so exact value is not critical although the lower the value the more current they draw. I would not go any lower than 10K though.
    bkirk wrote: »
    The schematic drawing shows that the daughterboard is using 33K pull-up resistors for S0 and S1. Is it possible to use lower resistors, though? Any idea how I would calculate the minimum necessary with a 3.7v supply? I'm having trouble finding a 33k resistor in the right SMD package, so would like more flexibility to use a lower value. Thanks.

    Ben
  • bkirkbkirk Posts: 37
    edited 2014-04-29 13:18
    I'm still prototyping, but trying to incorporate the sensor into a larger system of mine. I'd like to eventually print it to a pcb.
  • bkirkbkirk Posts: 37
    edited 2014-05-01 12:37
    Good to know, thanks kwinn.
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