The lossy characteristic of the sensors used for inductive sensing require injection of energy to maintain a constant sensor amplitude. The LDC1312/LDC1314 provides this energy by driving an AC current matching the sensor resonant frequency across the LC sensor. To achieve optimum performance, it is necessary to set the current drive so that the sensor amplitude is within the range of 1.2 VP to 1.8 VP. Each channel current drive is set independently between 16 µA and 1.6 mA by setting the corresponding IDRIVEx register field. The LDC1312/LDC1314 can also automatically determine the appropriate sensor current drive, and even dynamically adjust the sensor current by use of the RP_OVERRIDE_EN function.
Refer to Sensor Current Drive Configuration for detailed information on configuration of the sensor drive.