Patent ID: 7171858

Claim:
A semiconductor pressure sensor comprising: a semiconductor sensor part for detecting pressure; an adjustment and control part including a digital circuit with a memory for storing correction data which is used to correct an electric signal from said semiconductor sensor part, and a correction and amplification circuit that corrects and amplifies said electric signal; an input/output terminal that is connected to an input/output pad mounted on said adjustment and control part for inputting data to said memory and outputting said electric signal corrected and amplified; a voltage input terminal that is connected to a voltage input pad mounted on said adjustment and control part for impressing a voltage to said memory and inputting a voltage as an operating power supply for said semiconductor sensor part; a switch change-over terminal that is connected to a switch change-over pad mounted on said adjustment and control part; a voltage input change-over switch that is connected to said switch change-over pad and said voltage input pad; and an input/output change-over switch that is connected to said switch change-over pad and said input/output pad; wherein in a first mode in which said correction data is input to said memory, said voltage input change-over switch and said input/output change-over switch are operated by an input signal from said switch change-over terminal in such a manner that said voltage input terminal and said input/output terminal are connected to said digital circuit; and in a second mode in which said electric signal corrected and amplified is output, by means of an input signal from said switch change-over terminal, said voltage input change-over switch is connected to said semiconductor sensor part and said input/output terminal is connected to said correction and amplification circuit.