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ADXL372 external synchronization

Hello

Our customer will use ADXL372 at external sync (2000Hz) and internal clock (ODR=3200 Hz setting).

Datasheet rev.0 P24  "SYNCHRONIZED DATA SAMPLING" says below.

"

The EXT_SYNC is an active high signal. Due to the asynchronous
nature of the internal clock and external sync, there may be a
one ODR clock cycle difference between consecutive external sync
pulses. "

Question

What does one ODR clock cycle difference  mean ?

I think  that  ADXL372  outputs date at 1/3200 second after sync (every 1/2000 second )

when SYNC is 2000Hz and ODR setting is3200Hz (internal clock ).

Please let me know your advice how  "one ODR clock cycle difference" affects ADXL372 operation .

Regards,

Terumasa

Parents
  • Hi John-san,

    Thank you for your answer.

    Can I ask  below question ?

    1:

    Which  is the sample timing of internal ADC  based on  the EXT_SYNC or  internal clock?

    2

    The relationship of the internal clock and external sync are asynchronou.

    Is the acceleration data of ADXL372 interpolated 

    as the sample timing of accleration data  equals the timing trrigered by EXT_SYNC?

    3

    Does below timing chart  describes  Data ready ?

    If this is data ready,  this timing chart means that one data is lost.

    Could you teach me why the data is lost ?

    If there is the timing chart which indicates this reason, could you provide me of it ?

    Please let me know your advice.

    Regards,

    Terumasa

Reply
  • Hi John-san,

    Thank you for your answer.

    Can I ask  below question ?

    1:

    Which  is the sample timing of internal ADC  based on  the EXT_SYNC or  internal clock?

    2

    The relationship of the internal clock and external sync are asynchronou.

    Is the acceleration data of ADXL372 interpolated 

    as the sample timing of accleration data  equals the timing trrigered by EXT_SYNC?

    3

    Does below timing chart  describes  Data ready ?

    If this is data ready,  this timing chart means that one data is lost.

    Could you teach me why the data is lost ?

    If there is the timing chart which indicates this reason, could you provide me of it ?

    Please let me know your advice.

    Regards,

    Terumasa

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