Power on detection circuit

Details Power on detection circuit Power on detection circuit

2008-02-26

2009-11-03

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S142000, C327S198000

Reexamination Certificate

active

07612588

ABSTRACT:
A power on detection circuit for accurately detecting an input voltage with a simple circuit structure and reduced current consumption includes a voltage conversion circuit, which converts input voltage into current, and a latch circuit, which holds the power on detection signal. The voltage conversion circuit supplies output current to a current source and a capacitor via a connection node. The current source generates a flow of current that is proportional to the absolute temperature. When the output current of the voltage conversion circuit becomes greater than the current of the current source, the capacitor is charged and the voltage at the connection node is pulled up. A latching circuit is activated in accordance with the voltage at the connection node to output a power on detection signal.

REFERENCES:
patent: 6163585 (2000-12-01), Yamawaki et al.
patent: 2005/0140406 (2005-06-01), Rizzo et al.
patent: 2000031807 (2000-01-01), None
patent: 2000339962 (2000-12-01), None
patent: 2001292054 (2001-10-01), None
National Semiconductor, LMS33460 3V Under Voltage Detector, http://cache.national.com/ds/LM/LMS33460.pdf, Mar. 2001.

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