Low power process measurement transmitter

Details Low power process measurement transmitter Low power process measurement transmitter

1989-02-28

1990-05-15

Shaw, Gareth D.

Boots, shoes, and leggings

364900, 3649328, 3649219, 3649231, 3649232, G01R 1900, G06F 1130, G06F 100

Patent

active

049263404

ABSTRACT:
A transmitter couples an output to a loop which represents a sensed process variable such as pressure. A microprocessor-based circuit in the transmitter senses the process variable and computes an output signal and provides the output to the loop. A communication circuit in the transmitter receives a high frequency signal including a transmitter parameter from the loop. The communication circuit couples the parameter to the microprocessor. The microprocessor couples the parameter to an EEPROM. The high energization requirements of the EEPROM during a WRITE interval are supplied by an energization circuit. The energization circuit receives energization from the loop at a low rate so that the output is not substantially disturbed. The energization circuit stores energy and supplies energization to the EEPROM during the WRITE time interval without substantially disturbing the loop current.

REFERENCES:
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patent: 4442481 (1984-04-01), Brahmbhatt
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patent: 4466074 (1984-08-01), Jindrick et al.
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patent: 4520488 (1985-05-01), Houvig et al.
patent: 4598373 (1986-07-01), Morishita et al.
patent: 4646248 (1987-02-01), Reynolds
INTEL, Memory Components Handbook, 1984, Chapter 5, pp. 9-11, 68-72 and 83-103.

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