Interface unit for use between analog sensors and a microprocess

Details Interface unit for use between analog sensors and a microprocess Interface unit for use between analog sensors and a microprocess

1978-01-10

1980-02-26

Gruber, Felix D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 364111, 364835, H03K 1320, G06F 1520

Patent

active

041908236

ABSTRACT:
An improved interface circuit for use between variable voltage analog sensors which are measuring physical parameters and a microprocessor which is processing the data relating to such parameters. The interface unit is of the type employing an analog multiplexer, an analog to digital converter, a voltage to frequency converter, a counter for converting frequency to digital data, and a bus adapter for connection to the microprocessor. The inventive improvement relates to providing the multiplexer as a differential multiplexer having two differential voltage outputs and having a sign detector connected thereto. A switching block is connected between the differential voltage outputs and the voltage to frequency converter and also to the sign detector thereby acting as a selector circuit. The selector circuit passes each voltage output signal of the multiplexer which has a constant sign to the voltage to frequency converter, wherein the counter is an up/down counter whose counting input is connected to the sign detector output.

REFERENCES:
patent: 3710376 (1973-01-01), Fluegel
patent: 3737893 (1973-06-01), Belet et al.
patent: 3820109 (1974-06-01), Konrad et al.
patent: 3893103 (1975-07-01), Prill
patent: 3909601 (1975-09-01), Yamawaki et al.
patent: 3942172 (1976-03-01), Tucker
patent: 3967270 (1976-06-01), Anderson et al.
patent: 4050065 (1977-09-01), Mosley et al.
patent: 4061025 (1977-12-01), Willenbecher et al.
patent: 4072850 (1978-02-01), McGlynn
Mitchell: A Fast Analog Scanner for Data Acquisition on Nuclear Plants, GEC Journal of Science and Technology, vol. 43, No. I, 1976, pp. 37-47.

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