Patent ID: 7180798
Filing Date: 2007-02-20
Classification: G01D,G11C

Abstract:
1. A semiconductor physical quantity sensing device, comprising: a sensor element to generate an electric signal responsive to a detected physical quantity; an output terminal to output to the exterior the electric signal generated by the sensor element; a data input terminal to input serial digital data; an auxiliary memory circuit to temporarily store trimming data, for adjusting output characteristics of the sensor element, inputted from the data input terminal; a re-writable read-only main memory circuit to store, by way of an electrical re-write action, the trimming data stored in said auxiliary memory circuit; an adjusting circuit to adjust the output characteristic of the sensor element based on trimming data stored in the auxiliary memory circuit or trimming data stored in the main memory circuit, operation of the semiconductor physical quantity sensing device being configured to include active and passive elements formed on the same semiconductor chip and manufactured only by a CMOS manufacturing process, and an operation selection circuit to control operation of the auxiliary memory circuit and the main memory circuit based partly on digital data stored by the auxiliary memory circuit.