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no or always calibration

duuk lee
Intellectual 290 points

Hello,

1).  If bit 7 of config1 register = 0, then will calibrations automatically run after receiving 'STOP' signal ?   According to datasheet p25, it should not, but from test bench, calibration was performed even with that 'Force_Cal' bit = 0 .  So wonder which one is right ? 

2).  Also for 'INTB' signal, after its falling edge, when will it goes back to 1  ?  

Thanks !

  • 0
    TI__Mastermind 21685 points
    DL,

    1) If bit 7 (FORCE_CAL) is 0, then calibration is not performed only if TDC measurement is interrupted or aborted for any reason like counter overflow or missing stop signal. If STOP signal is received and measurement completes without overflow, then calibration is done.

    2) INTB goes back to 1 when new measurement is initiated through SPI. Writing a 1 to interrupt status register bit clears the bit as well as make INTB return to 1.

    Thanks,
    Vishy