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AMC7834: where to measure t(OZD) for SDO tri-state to driven state

Allan Fan
Expert 7100 points
Part Number: AMC7834


Hi expert,

May I know what's the measure points for t(OZD)? I thought it's the time to measure the delay between the CS signal falling edge and the SDO signal transition from tri-state to driven. 

However, from the timing diagram in the DS, it shows from falling edge of SCLK. Could you please clarify about it? 

 

Regards,

Allan

  • 0
    TI__Guru 54323 points

    Hi Allen,

    The AMC7834 only actively drives the SDO pin when it is clocking out data.  This device features a 16-bit address and 8-bit data SPI frame.  During a read command, the device only actively drives the SDO pin during the 8-bits that it is transferring to the master.  The pin is high-z until the falling edge clock that corresponds to bit 8.  At that point, the device will transition from high-z to driven.

    You can test this by connecting a pull up resistor to SDO and read back a register where you know the first bit in the data byte will be zero.  Then you just measure the time between the falling edge of the last address bit to when the SDO line transitions from high to low.