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Digital IO question

Al McBride
Intellectual 620 points

Other Parts Discussed in Thread: CC2530

Fellow Developers:

 

I need to disable both the pullup and pulldown for a digital input. I cannot seem to see how to not have either connected. The documents imply one or the other is connected. I am using p0.1 as my input. My source of the input provides 3.3 volts when a 1 and its own pull down when a 0. Its pull down is 1 megohm to gnd. The source and my CC2530 use the same supply and ref.

 

Any ideas would be most appreciated. I have this working on my MSP430 designs but not the CC2530.

 

Thanks in advance

Al McBride

SMART Light Systems

  • 0
    TI__Genius 10650 points

    Hi Al McBride,

    Please refer to the CC2530 User Guide section 7.3 to understand how you can configure the IO pin without pull up or pull down. Below is the section from the user guide for your reference.

    "When used as an input, the general-purpose I/O port pins can be configured to have a pullup, pulldown or

    three-state mode of operation. By default, after a reset, inputs are configured as inputs with pullup. To

    deselect the pullup or pulldown function on an input, the appropriate bit within the PxINP must be set to 1."

    Regards

  • 0 in reply to Suyash Jain
    Guru 11440 points

    Hi Suyash

         i have a question of pullup and pulldown for the IO config.

         i want to set the P01 and P04 as input，keep low in normal and receive high means active.

         What could i config those Pins in software（pulldown ， pullup or tristates）although  i have set a external pull-down resistor on those Pin.

         And which config should be better for low power consumption design？

         what value of external pull-down resistor should i choose？