• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 293 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.

THVD8000: tmode and tRX-TXX_OOK

Jonathan Navor
Genius 9475 points

Part Number: THVD8000

Hi Team,

Could you please help our customer about their THVD8000  project. We are trying to determine the timings of delays we need prior to sending UART commands via the THVD8000. I had a couple questions.

1. For the switching characteristic timings (t_TX-RX_OOK and t_RX-TX_OOK, sction 6.8 of the THVD8000 datasheet), the units are given in clock cycles. Is that referring to the clock cycle of incoming data? So for UART, we can use the baudrate we are using? Thats what it looks like from figure 7-8

2. The datasheet mentions a 'tmode' which sounds it is already incorporated within the device. What is that timing exactly? The datasheet doesnt mention it anywhere else except when talking about avoiding glitches and TX timeouts.

Thank you in advance for the support

Best regards,

Jonathan

  • 0
    TI__Guru 54042 points

    Hi Jonathan,

    1. You are correct - the clock cycles is based on the modulated data frequency received. There is some nuance as the demodulator also is tuned when you select a frequency range as there is a need for the device to react to a specific frequency range - so the clock cycles are based on the incoming data-stream but the modulation frequency should be set to correct point to receive the data correctly as well. 

    2.Tmode is just a stand in for the time it takes to switch between modes - so this covers two specifications the T_tx-rx_OOK and the T_rx-tx_OOK. Essentially it just is saying that when the modes are being switched you shouldn't see glitches. For the timeout it is just referring to the T_rx-tx_OOK - essentially after one of the timeout ending events occurs the device will take up to 12 clocks (depends on the frequency that is set) to wake back up.  As essentially the device is just holding the driver Hi-Z in timeout which is what is happening in RX mode as well.

    Please let me know if you have any other questions!

    Best,

    Parker Dodson