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ADS124S06: Wrong clock configuration

Genius 14050 points
Part Number: ADS124S06

Hello,

 

My customer has a question for ADS124S06.

 

When there is no external available clock but CLK bit in Data Rate Register is wrongly set to use external clock, can the device be reset by /RESET signal?

The datasheet specifies required reset pulse duration by T_CLK. But in this case, it means there is no clock source. This is he background of this question.

 

Also when the device in the same situation, does the device still accept SPI command? Does SPI timeout function still work?


Regards,

Oba

  • Hi Obata-san,

    Just setting the CLK bit in the Data Rate Register does not automatically switch from the internal oscillator.  There must also be a valid clock.  If there is no external clock (CLK pin is at ground) setting the CLK bit has no effect.  For switching to the external clock there must be clocks present on the pin as there is an internal clock detection circuit.

    If no external clock is present, the ADS124S06 will continue with the internal oscillator even though the CLK bit is set.  This means the SPI communication is still valid and the RESET command and SPI timeout will still function.  The RESET pin going low will also reset the device.

    Best regards,

    Bob B