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RS27EI autopower down fuction issue

nision wu
Prodigy 20 points
Other Parts Discussed in Thread: TRS3227E

hello:

  I use RS27EI autopower down fuction, it will powerdown in 30 seconds when not any tx. but when in powerdown mode, a transmission start, and many bits at start will be wrong, can anybody tell me why and how can I fix it.

  • 0
    TI__Guru**** 165146 points

    Nision Wu,

    The "READY" output pin must be high before any transmit data is sent.
    Setting "FORCEON" high is one method of preparing the TRS3227E for data transmission.

    Is your application capable of reading "READY" signal and controlling "FORCEON" ?

  • 0 in reply to Ron Michallick
    Prodigy 20 points

    Hello, Ron Michallick:

        Did you means:

        If I use powerdown function, when TRS3227E in powerdown mode, I must first send a unuse data, then wait a while or read the READY pin, then I can send my own data? And this unuse data may cause recive a unknow data.

        Or how can I wake up TRS3227E from powerdown mode? ps: I set FORCEON low, and I can't set it high.

  • 0 in reply to nision wu
    TI__Guru**** 165146 points

    Nision,

    If the "READY" pin is high then data can be transmitted immediately.
    If the "READY" pin is low. Change the DIN to bring the device out of power down (note that the start bit has not yet begun). Then wait for "READY" high. At this time (~100uS later), the start bit begins and the rest of the data byte follows in real time.