Method and apparatus to automatically select operating voltages

Details Method and apparatus to automatically select operating voltages Method and apparatus to automatically select operating voltages

1998-09-09

2000-04-25

Berhane, Adolf Deneke

Electricity: power supply or regulation systems

External or operator controlled

Using an impedance as the final control device

G05F 308

Patent

active

060548479

ABSTRACT:
A method and apparatus to automatically select operating voltages for a device. The method comprising the steps of: connecting a variable resistive network in series to a first side of a resistor for varying the current through the resistor; charging an inductor with a modulate pulse train, the inductor being connected to the second side of the resistor; outputting a voltage equal to the voltage across the resistor and a fixed reference voltage located at the first side of the resistor; determining if at least one designated processor pin is connected to ground; and varying the resistance of the resistive network if at least one pin is connected to ground so as to change the current flowing through the resistor, thereby changing the voltage across it.

REFERENCES:
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patent: 4849903 (1989-07-01), Fletcher et al.
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patent: 5532580 (1996-07-01), Shu et al.
patent: 5828209 (1998-10-01), Janssen
patent: 5831419 (1998-11-01), Casper

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