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Original question:

CS input of TSC2046E

TSC2046E: About /CS and BUSY signals

KAZUNARI SAEKI
Prodigy 20 points
Part Number: TSC2046E
Other Parts Discussed in Thread: TSC2046

Hi

1.

Please tell me about the "BUSY" release after inputting Contol Bits.

When "BUSY" = High, is "BUSY" released by the falling edge of "DCLK" ?

2.

Please tell me what happens when "/CS = high" during "one communication" .

"/CS = high" during "one communication" is defined as when DCLK is less than 24 cyc.

If "/CS = high" during communication, will the communication status be reset,

and if the specified communication format is used agein when "/CS = low" , will it be possible to communicate correctly?

Best regards,

  • 0
    TI__Guru**** 168605 points

    Hi Kazunari,

    Again - some screen captures of you communication lines would be beneficial here.  There is no communication with the device if /CS is high and the BUSY output would be in a high impedance state.  When /CS is low, the control byte is sent to the TSC2046 and BUSY goes high for one DCLK cycle while the MSB is being converted - it should go low with the falling DCLK edge after the command byte.

  • 0 in reply to Tom Hendrick
    Prodigy 20 points

    Hi Tom san,

    Thank you for your quick reply.

    This question assumes that the host side cannot hold CS or DCLK due to some trouble.

    Am I correct in understanding that when CS goes high, both BUSY and DOUT become idle?

    Is there a problem if I set CS = low again and start the specified communication format again from the beginning?
    Will the data that was interrupted in the previous communication continue to be output?

  • +1 in reply to KAZUNARI SAEKI
    TI__Guru**** 168605 points

    Hi Kazunari,

    Yes - both BUSY and DOUT become tri-state when /CS goes high.  In your depicted scenario, you are re-starting with the command byte.  This would re-start the capture and convert process, there is no problem with this at all!