Direct sensor interface (DSI) module

Details Direct sensor interface (DSI) module Direct sensor interface (DSI) module

1997-05-12

1998-12-29

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 72, H03K 5153, H03K 522

Patent

active

058545646

ABSTRACT:
A direct sensor interface (DSI) module which allows a microcontroller to directly interface to sensors having at least one of a resistive, capacitive, and/or current source characteristic. The DSI module is coupled directly to a sensor device, which could be a reference resistor, which generates a sensor current. A current mirroring circuit outputs a charging current proportional to the sensor current. A capacitive sensor and/or a capacitive device is coupled to the current mirroring circuit and generates a voltage when charged by the charging current. Using a comparator and a threshold voltage source, the time it takes the capacitive sensor and/or a capacitive device to ramp up from zero to the threshold voltage can be measured. The charging time is proportional to the sensor reading.

REFERENCES:
patent: 5384505 (1995-01-01), Takahashi
patent: 5463333 (1995-10-01), Calder et al.
patent: 5498986 (1996-03-01), Manlove

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