Single pin multi-state identifier using RC timing element

Details Single pin multi-state identifier using RC timing element Single pin multi-state identifier using RC timing element

2007-11-01

2009-10-13

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S711000, C327S037000, C327S344000, C710S104000

Reexamination Certificate

active

07602195

ABSTRACT:
In a circuit identifier, an electrical circuit includes an output node to output an electrical signal. A resistor device and a capacitor device, electrically in series with the resistor device, receive at least a portion of the electrical signal. A counter device determines a time for the capacitor device to reach a predetermined charge and assigns a value to the time for the capacitor device to reach the predetermined charge. A processor or other system reads the value assigned by the counter device and identifies the capacitor from a predetermined list of capacitors. The identification of the capacitor identifies a revision of the circuit.

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Texas Instruments NA555, NE555, SA555, SE555 Precision Timers Data Sheet, SLFS022F, Sep. 1973—Revised Jun. 2006, Copyright Texas Instruments, Inc., 1973-2006.

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