Low voltage and low power detector circuits
First Claim
1. Low voltage and low power circuits for use in a subscriber power controller comprising:
- low voltage detection means for generating a first output signal switching between ECL logic levels;
said low voltage detection means being formed of a first comparator means and a first output stage;
said first comparator means being formed of a first comparator with hysteresis for comparing a low voltage detection signal proportional to a primary input supply voltage with a first internal reference voltage to produce a first detected signal;
said first output stage being responsive to said first detected signal to produce said first output signal;
low power detection means for generating a second output signal switching between a high voltage level and a low voltage level;
said power detection means being formed of a second comparator means and a second output stage;
said second comparator means being formed of a second comparator with hysteresis for comparing a low power detection signal proportional to the primary input supply voltage with the second internal reference voltage to produce a second detected signal; and
said second output stage being responsive to said second detected signal to produce said second output signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Low voltage and low power circuits for use in a subscriber power controller includes a low voltage detection circuit for generating a first output signal switching between ECL logic levels and a low power detection circuit for generating a second output signal switching between a high voltage level and a low voltage level. The low voltage detection circuit is formed of a first comparator with hysteresis and a first output stage. The low power detection circuit is formed of a second comparator with hysteresis and a second output stage. The first output signal is used to disable the controller upon detection of a low voltage at the primary input signal voltage. The second output signal is used to inform a microprocessor so as to permit it to disable all high power functions in order to conserve power.
-
Citations
15 Claims
-
1. Low voltage and low power circuits for use in a subscriber power controller comprising:
-
low voltage detection means for generating a first output signal switching between ECL logic levels; said low voltage detection means being formed of a first comparator means and a first output stage; said first comparator means being formed of a first comparator with hysteresis for comparing a low voltage detection signal proportional to a primary input supply voltage with a first internal reference voltage to produce a first detected signal; said first output stage being responsive to said first detected signal to produce said first output signal; low power detection means for generating a second output signal switching between a high voltage level and a low voltage level; said power detection means being formed of a second comparator means and a second output stage; said second comparator means being formed of a second comparator with hysteresis for comparing a low power detection signal proportional to the primary input supply voltage with the second internal reference voltage to produce a second detected signal; and said second output stage being responsive to said second detected signal to produce said second output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. In a subscriber power controller device for converting a high voltage at a subscriber interface into a stable, regulated low voltage to be used by integrated circuits in an integrated services digital system terminal equipment, said controller device including low voltage detection means for detecting a low voltage in the primary input supply voltage so as to disable the controller and low power detection means for detecting a low power level in the primary input supply voltage so as to permit a microprocessor to disable all high power functions in order to conserve power, said low voltage and low power detection means comprising:
-
low voltage detection means for generating a first output signal switching between ECL logic levels; said low voltage detection means being formed of a first comparator means and a first output stage; said first comparator means being formed of a first comparator with hysteresis for comparing a low voltage detection signal proportional to a primary input supply voltage with a first internal reference voltage to produce a first detected signal; said first output stage being responsive to said first detected signal to produce said first output signal; low power detection means for generating a second output signal switching between a high voltage level and a low voltage level; said power detection means being formed of a second comparator means and a second output stage; said second comparator means being formed of a second comparator with hysteresis for comparing a low power detection signal proportional to the primary input supply voltage with the second internal reference voltage to produce a second detected signal; and said second output stage being responsive to said second detected signal to produce said second output signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A method of generating a first output signal representing detection of a low voltage in the primary input supply voltage and a second output signal representative of a low power in the primary input supply voltage for use in a subscriber power controller, said method comprising the steps of:
-
comparing a low voltage detection signal proportional to a primary input supply voltage with a first internal reference voltage to produce a first detected signal; converting said first detected signal to produce the first output signal switching between ECL logic levels; comparing a low power detection signal proportional to the primary input supply voltage with a second internal reference voltage to produce a second detected signal; and converting the second detected signal to produce the second output signal switching between a high voltage level and a low voltage level.
-
Specification