Operation controlling

Details Operation controlling Operation controlling

2011-03-22

2011-03-22

Vu, Bao Q (Department: 2838)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S573000

Reexamination Certificate

active

07912516

ABSTRACT:
The invention deals with a controlling device (22) for an electrical device such as for example a hearing aid (20). The hearing aid (20) includes a power supply (23) and a functional unit (21) controlled by the controlling device (22) via a reset signal (2). In order to reduce undesired behavior of the hearing aid in case of transients, brown-out or other oscillations of the input voltage (1), the controlling device (22) is built such that the functional unit (21) is resetted as long as the rising supply voltage (1) is lower than a startup threshold. Once the functional unit (21) is enabled, it remains enabled as long as the supply voltage (1) does not fall below a shutdown threshold where the shutdown threshold voltage is lower than the startup threshold voltage. This hysteresis is implemented via a reference generator (24) generating a constant reference voltage (27) and a modifiable voltage divider (28) which generates different output voltages (1.1) in dependency of the output of the comparator (25).

REFERENCES:
patent: 6310556 (2001-10-01), Green et al.
patent: 2002/0158612 (2002-10-01), Genest et al.
patent: 2003/0104849 (2003-06-01), Arimitsu
patent: 2003/0122524 (2003-07-01), Rhee et al.
patent: 2005/0196002 (2005-09-01), Hagen et al.
Texas Instruments, TPS3801/09—Smallest SVS for Monitoring DSPs and Processors, Application Report, Sep. 1999, 1-23.
Texas Instruments, TPS3820-xx, TPS3823-xx, TPS3824-xx, TPS3825-xx, TPS-3828xx Processor Supervisory Circuits, Dec. 2002, 1-14.
ADM696/ADM697, Microprocessor Supervisory Circuits, Analog Devices, 1-11.

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