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problem with the continous mode of AD7738

I cannot read the status and data registers in the continuous mode of AD7738. The single mode is OK. On page 23 of the data sheet in fig.12 the value of the mode register for the continuous mode is wrong. Couldn't find errata for the AD7738.Any idea?

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  • Hi Chris,

    Instead of 28h I use 2Ch in the mode register, because the third bit is CONT_RD and should be “1” for the continuous mode. Still couldn’t make it respond.

    The chip enters the continuous mode but keeps pulsing the Ready line as if I don’t read the content of the data register although I write once in the communication register

    “48h” to address the data register and then read 3 bytes in a row with DIN low as prescribed by the data sheet ( the first byte should be the content of the

    Status reg. and the other 2 the real data). All I always get is ffh for all 3 bytes.

    Is there a requirement that the read of the status register should happen only AFTER the Ready bit goes low?

    Thanks for your help.

    I tried to answer in Engineering Zone but for some reason I couldn’t send the reply

    BR,

    Peter

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  • Hi Chris,

    Instead of 28h I use 2Ch in the mode register, because the third bit is CONT_RD and should be “1” for the continuous mode. Still couldn’t make it respond.

    The chip enters the continuous mode but keeps pulsing the Ready line as if I don’t read the content of the data register although I write once in the communication register

    “48h” to address the data register and then read 3 bytes in a row with DIN low as prescribed by the data sheet ( the first byte should be the content of the

    Status reg. and the other 2 the real data). All I always get is ffh for all 3 bytes.

    Is there a requirement that the read of the status register should happen only AFTER the Ready bit goes low?

    Thanks for your help.

    I tried to answer in Engineering Zone but for some reason I couldn’t send the reply

    BR,

    Peter

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