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CC1352R: CC1352R UART

mamatha dasari
Expert 2850 points

Part Number: CC1352R

Hello,

I am using CC135R controller. In CC1352R1_LAUNCHXL.C file UART  RX  pin configured  as pull_down. what is use of pull_down?

  • 0
    TI__Genius 11810 points
    Hello Mamantha,

    The RX pin is configured with a pull down to prevent the pin from floating which can cause false UART signals and also lead to increased current consumption. The direction of the pull resistor is dependent on your system.

    -Simon
  • 0
    TI__Guru 58425 points
    Hi,

    You are correct that the UART RX pin is configured to pull-down in the BoardGpioInitTable table. However, this table only contains the configuration for IOs that is not "in use". This means that it is the configuration of the IO when not used by the UART driver.

    In the case of the launchpads, the default setting is to pull it low to avoid leak currents in the level converters used on the boards.