Automatic runaway detector and reset circuit

Details Automatic runaway detector and reset circuit Automatic runaway detector and reset circuit

1997-06-06

1999-02-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, H03L 700

Patent

active

058699910

ABSTRACT:
A circuit prevents continuation of a runaway condition in a micro-controller. When the output terminal in a C-MOS push-pull structure of the micro-controller becomes uncontrollable as a result of runaway of the micro-controller, the usually low potential of the output terminal elevates, and is used as detection signal. The detection signal is applied to the base of a detection transistor to conduct the detection transistor, resulting in the voltage of the reset terminal of the micro-controller, which is connected to the collector of the detection transistor, to become a "LOW" level to stop the runaway condition. The port terminal voltage is set to a "LOW" level based on the change of the reset terminal voltage which conducts the diode connected between the port terminal and the base of the detection transistor, thereby lowering the base potential of the transistor and hence the control transistor is cut off. As a result, the reset terminal of the micro-controller is returned to the normal high potential, thereby resetting the micro-controller.

REFERENCES:
patent: 5576650 (1996-11-01), Hirotani et al.

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