Pressure sensor
First Claim
1. A pressure sensor including an element portion for detecting pressure and a circuit portion having a signal processing function, both of which are integrally accommodated in the same package,said circuit portion comprising:
- a first section for performing analog processing of a detection signal from said element portion;
a second section for storing bit data for characteristic adjustment and compensation and performing characteristic adjustment and compensation of the detection signal from said element portion based on said bit data;
an interface section optimized to interface with external wiring;
an A/D conversion section for digitally encoding the analog processed detection signal;
a digital processing section for converting the digitized signal into a desired serial signal; and
an analog signal output and a serial signal output which are selectable between two output forms inclusive of an analog processed detection signal and a digital processed detection signal.
1 Assignment
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Accused Products
Abstract
A pressure sensor is provided which is tolerant to noise such as electromagnetic waves, is configured so as to be capable of easily selecting a system environment in which a sensor signal, commonly used for various kinds of systems, can be freely read in at timing as required by a system, and is able to realize reduction in size and cost suitable for automotive use. An element portion for detecting pressure and a circuit portion having a signal processing function are integrally accommodated in the same package. An interface section 24 optimized to interface with external wiring, an A/D conversion section 25 for digitally encoding an analog processed detection signal of the sensor, and a digital processing section 26 for converting the digitized signal into a desired serial signal are added to the circuit portion 2. The entire circuit portion is constituted by at most two ICs alone, and a selection can be made between two output forms including an analog processed detection signal and a digital processed detection signal.
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Citations
11 Claims
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1. A pressure sensor including an element portion for detecting pressure and a circuit portion having a signal processing function, both of which are integrally accommodated in the same package,
said circuit portion comprising: -
a first section for performing analog processing of a detection signal from said element portion;
a second section for storing bit data for characteristic adjustment and compensation and performing characteristic adjustment and compensation of the detection signal from said element portion based on said bit data;
an interface section optimized to interface with external wiring;
an A/D conversion section for digitally encoding the analog processed detection signal;
a digital processing section for converting the digitized signal into a desired serial signal; and
an analog signal output and a serial signal output which are selectable between two output forms inclusive of an analog processed detection signal and a digital processed detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A pressure sensor including an element portion for detecting pressure and a circuit portion having a signal processing function, both of which are integrally accommodated in the same package,
said circuit portion comprising: -
a first section for performing analog processing of a detection signal from said element portion;
a second section for storing bit data for characteristic adjustment and compensation and performing characteristic adjustment and compensation of the detection signal from said element portion based on said bit data;
an interface section optimized to interface with external wiring;
an A/D conversion section for digitally encoding the analog processed detection signal;
a digital processing section for converting the digitized signal into a desired serial signal; and
a power supply input port for receiving electric power from an external power supply, and a power supply circuit for generating a voltage which has a ratio metric relation with respect to an input voltage supplied to said power supply input port and which has dropped from said input voltage from said external power supply, and said respective sections other than said power supply circuit and said interface section are configured to be operated by said dropped power supply circuit output.
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Specification