JAJSI72 November 2019 LDC1001
PRODUCTION DATA.
The LDC1001 is an Inductance-to-Digital Converter that measures the parallel impedance of an LC resonator. The device accomplishes this task by regulating the oscillation amplitude in a closed-loop configuration to a constant level, while monitoring the energy dissipated by the resonator. By monitoring the amount of power injected into the resonator, the LDC1001 can determine the value of RP. When the value is determined, the device returns this as a digital value which is inversely proportional to RP.
The threshold detector block provides a comparator with hysteresis. With the threshold registers programed and comparator enabled, proximity data register is compared with threshold registers and INTB pin indicates the output.
The device has a simple 4-wire SPI interface. The INTB pin provides multiple functions which are programmable with SPI.
The device has separate analog and I/O supplies. The analog supply operates at 5 V and the I/O operates at 1.8 to 5 V. The integrated LDO requires a 56-nF capacitor connected from the CLDO pin to GND.