Patent ID: 11953460
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 8:
9. An integrated circuit, comprising:
a silicon substrate;
circuitry on or over said silicon substrate, the circuitry including top-level metal interconnects;
a primary passivation barrier over said top-level metal interconnects;
conductive vias through said primary passivation barrier to said top-level metal interconnects;
a capacitor above said primary passivation barrier and electrically coupled through said conductive vias to said circuitry, said capacitor comprising interdigitated metal fingers with spaces therebetween;
a secondary passivation barrier over said capacitor; and,
a hygroscopic material layer over said secondary passivation barrier, wherein said capacitor is operable to exhibit a capacitance value responsive to moisture present in said hygroscopic material layer and said circuitry is operable to generate a signal responsive to said capacitance value.