Coded data generation or conversion – Analog to or from digital conversion – Multiplex
Patent
1992-03-12
1992-11-24
Hoff, Marc
Coded data generation or conversion
Analog to or from digital conversion
Multiplex
341155, H03M 112
Patent
active
051666855
ABSTRACT:
An analog-to-digital conversion system module comprises a pin-limited A/D converter integrated circuit (I.C.) to which at least one multiplexer I.C. may be coupled and sampled.
In one embodiment, host system software involvement is minimized by providing a sequence of sample commands, implemented by a channel sequencer or a programmable control table comprising a plurality of conversion command words (CCW's). A set of CCW's defines a conversion sequence which may be initiated and performed with minimal host system software involvement, upon conclusion of which a result table storing the converted digital values may be read by an associated device, such as a CPU.
In one embodiment, some I/O pins of the A/D converter I.C. function either as analog inputs or address outputs to the external multiplexer, while other analog input pins alternatively function as single input channels or as combined channels from one or more external multiplexers. A software-loadable control register comprises a control field for a control word which determines the function of the programmable pins.
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Campbell, Jr. Jules D.
Huston William D.
LaViolette William P.
Hoff Marc
King Robert L.
Meyer Jonathan P.
Motorola Inc.
Nielsen Walter W.
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