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ADS7841 question about timing and busy signal

na na78
Guru 16770 points

Hi

1.

According to the Figure 4 in the datasheet, the data seems to be transferred continuously after CS became H to L.
We don't need to toggle CS to high for continuous transmission, is this understanding correct?

2.

Could you explain role of the BUSY? Are there any reason why BUSY has timing specification (tbd, tbdv, tbtr)?
Is it possible to achieve data transmission without BUSY?

3.

We assume that we keep CS Low in operation.  Are there any problems?

BestRegards

  • 0
    TI__Mastermind 25020 points
    Hello,

    1. What mode is being used?
    Note that Figure 4 uses 16 clock timing, 8 bit bus interface. To achieve this function properly please review section 16-clocks per conversation on page 11. In this mode, CS does not need to be toggled to begin a conversation. As the datasheet explains, the control bits for conversion n+1 can be overlapped with conversion ‘n’ to allow for a conversion every 16 clock cycles, and each conversion needs be fully done within 1.6ms. I would highly suggest monitoring BUSY in this mode.

    2. The BUSY signal is important to monitor, it informs the user that the ADC is in fact working; the rising edge notifies the user when the conversation phase of the conversation cycle has begun, this helps in indicating data out. It is not recommended to leave this pin floating or unmonitored.


    3. I am not too sure about specifically you mean by during operation.
    But during a conversation cycle, there is no problem, as explained in part1.
    If you are referring to the power consumption and power down modes when the ADC is not being used, the different modes are explained in page 13, under Power Dissipation. Depending on how the device is being used, this is different; I highly suggest reading this section to apply the correct user case scenario.

    -Cynthia