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Power modes for LDC1000

Riki Patel
Expert 1055 points

Hello,

We are using LDC1000 to detect change in Inductance. Both LDC and MCU are Primary battery powered.

To save power we want to keep the LDC in standby mode for most of the time unless the change in Inductance is detected by the LDC.

In such a case an interrupt would be generated to MCU and MCU would make the LDC to enter Active mode and receive converted data from LDC.

Again after reading the converted digital data, MCU will turn the LDC in Standby mode.

Please comment on above method if it is possible to implement or the LDC has to remain in Active mode for detecting change in Inductance?

Also, what is the conversion time of LDC? 

Thanks

  • 0
    TI__Genius 14270 points

    Hello Riki,

    The LDC1000 needs to be active to detect changes in inductance. For lower power consumption, you can consider using the LDC131x or LDC161x devices, which support a very low power (<1uA) shutdown mode. These devices also need to be in active mode to convert, but the lower supply voltage and extremely low shutdown power may make them better suited to your application.

    For the LDC1000, the conversion time is a function of sensor frequency and RESPONSE TIME setting. For the LDC131x/LDC161x, the conversion time is based on the number of channels, the reference frequency, and the programmed RCOUNT value.
     
    The sequence would be:
    1) MCU wakes up on timer
    2) MCU brings LDC out of shutdown
    3) MCU configures LDC
    4) MCU sets LDC to active mode
    5) MCU goes to sleep
    6) LDC completes conversion, sends INTB pulse to MCU to wake MCU.
    7) MCU retrieves conversion result
    8) MCU put LDC to shutdown
    8) MCU processes conversion result, branches as necessary
    9) MCU returns to sleep if appropriate and returns to step 1.

    Regards,

    ChrisO