Patent ID: 8051711

Claim:
An electronic circuit for measuring at least one physical parameter that is selected from the group consisting of acceleration, angular velocity, force and pressure, the electronic circuit including: a sensor interface, connected at its input to an external sensor that measures a physical parameter, and supplying at its output an analogue measurement signal which is a representative of a value of the physical parameter; an analogue-digital converter, digitally converting the analogue measurement signal; a digital signal control and processing unit, receiving in its input the resulting digitally converted signal, and supplying at its output a digital measurement signal which is a representative of the value of the physical parameter; a voltage regulator, powered via a first external supply voltage source, wherein the voltage regulator supplies a regulated voltage to the sensor interface, the analogue-digital converter and the digital signal control and processing unit, so that the analogue measurement signal and the digital measurement signal are independent of any variation in the level of the supply voltage from the first external supply voltage source; and a ratiometric unit, powered by a second external supply voltage source, wherein the ratiometric unit supplies an analogue output measurement signal which is a representative of the value of the physical parameter, wherein the analogue output measurement signal is obtained on the basis of the analogue measurement signal or the digital measurement signal that is independent of any variation in the level of the supply voltage from the first external supply voltage source, and wherein the analogue output measurement signal is dependent upon the variation in the level of the supply voltage from the first external voltage source or the second external voltage source.