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RF430F5978: RF430F5978's function

Takashi Hosokawa
Expert 1455 points
Part Number: RF430F5978


Hi All,

I have a few questions about RF430F5978's function.

1. How is the AFE_ACTI pin of RF430F5978 used?

    Looking at the circuit diagram of EVM (RF430F5978EVM), the connection was Open.

    Is this pin outputting the status of Analog Front End to the outside?

2. SW0 - SW7 pin

    Is it correct with the understanding that these Pin functions wake the CPU using the external switch without using GPIO interrupts?

    Please let me know if different.

Best Regards,

Takashi

  • 0
    TI__Guru*** 135355 points
    Hello Takashi,

    I was not in office today and I am not an expert on this device. I will need to forward this question to the product team, and won't get an answer until Monday at earliest. Sorry for the delay in support, but I will make sure you get an answer as soon as possible.
  • 0
    TI__Guru*** 135355 points
    Hello Takashi-san,

    1) AFE_ACTI pin is not used on EVM but is only a Test pin for TI production

    2) Yes. The SW0-SW7 generate a wake signal. On the EVM, the wake pin from the LF front end is directly connected to the CC430 P1.0 I/O port to handle the wake interrupt and then read out via the serial interface the wake info. (see SLAU 378, 24.6.9)
  • 0 in reply to Ralph Jacobi
    Expert 1455 points

    Hello Ralph-san,

    Thank you for your response.

    > 1) AFE_ACTI pin is not used on EVM but is only a Test pin for TI production

    -> Is it OK to terminate the AFE_ACTI pin with Open?

        User's Guide (slau378) P50 Table 1-3 Connection of Unused Pins  did not include AFE_ACTI Pin.

        It is open in the EVM's circuit diagram.

    > 2) Yes. The SW0-SW7 generate a wake signal. On the EVM, the wake pin from the LF front end is directly connected to the CC430 P1.0 I/O port to handle the wake interrupt and then read out via the serial interface the wake info. (see SLAU 378, 24.6.9)

    -> Here, what kind of function is assumed?

        Is it different in objective to wake the CPU by attaching an external switch directly to GPIO Pin of MSP430?

        This function is for forcing the CPU to wake up even if the wake pattern does not come from the outside.

        Is it Correct?

    Best Regards,

    Takashi

  • 0 in reply to Takashi Hosokawa
    TI__Guru*** 135355 points
    Hello Takashi-san,

    Yes you can leave AFE_ACTI open.

    The switches allow for a Wake signal to be asserted to an external MCU if they are triggered: "The switch interface asynchronously detects a pressed switch and starts the sampling of the switches with a given, configurable sampling frequency fsw_sampl. After two consecutive samples for a switch, the device internally recognizes the switch as pressed and sets the WAKE-signal to the external microcontroller"

    This does force the CPU to wake even when a wake pattern hasn't been received over RF.