• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 34 subscribers
  • Views 493 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Pullup and pulldwon resistors in DS90C387A schematic

Ted Xu
Expert 5345 points

Other Parts Discussed in Thread: DS90C387

I found the pull-up and pull-down resistors at such as R_FB,BAL pins are 10ohm in the AN<LDI demonsrtation Kit user muanula (LDI3V8BT-112)>. Please confirm whether is10ohm resistors ok? In general, the pull-up and pull-down resistor are larger.

  • 0
    Mastermind 7395 points

    You are correct, the input resistor used is very small. The input current to the device is very small, so I would also use a bigger resistor, with the typical 4.7K value.

  • 0 in reply to Avi Chami1
    TI__Expert 7395 points

    Hi Ted,

    The schematic referenced in the user manual is for the DS90C387/388 evaluation board. The R_FB and BAL pins on the EVM are intended to be configured through the headers/jumpers. The 10ohm series resistor for each pin was a pad option to allow users to populate different values as needed. A higher pullup/pulldown value can be used to set the logic High/Low state of the pins.

    Dac Tran

    SVA / APPS