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Exposing LDC1612 to up to 12V when not actively measuring.

jtee
Prodigy 90 points
Other Parts Discussed in Thread: LDC1612

In my application, I need to periodically measure the inductance of a coil that has voltages up to 12V across it.  I would like to take measurements when there is no voltage across the inductor and it is in an isolated state.  My circuit already accounts for this just fine.


My question is about the proper way to avoid damage to the LDC1612 when it is not actively taking measurements.  Is the LDC1612 able to tolerate exposure of up to 12V if the device is set to shutdown mode?  Or, alternatively, is it possible to protect the device by properly designing the impedance of the circuit such that the 12V comes from a high impedance path?

  • 0
    TI__Genius 14270 points
    Hello,

    12V will exceed the Absolute Max rating of the LDC inputs. You may try using some analog switches to isolate the LDC inputs from the 12V. If so, try to minimize the parasitic capacitance of the analog switch. For best performance, the sensor capacitor should be closer to the inductor and not next to the LDC. You will also need to make sure that when you connect the LDC you are not throwing the switch when the voltage is above the Abs Max.

    Regards,

    ChrisO