Low power plug-in card removal detection

Details Low power plug-in card removal detection Low power plug-in card removal detection

1998-06-29

2000-05-23

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340649, 3241581, 711115, G08B 2100

Patent

active

060670274

ABSTRACT:
A circuit on a detachable device, such as a plug-in card, determines when the detachable device has been disconnected from a host device. The circuit includes a node, a power source, a switch and a control circuit. The node is connected to ground when the detachable device is connected to the host device. The node is disconnected from ground when the detachable device is disconnected from the host device. The switch is for connecting and disconnecting the node to the power source. The control circuit is for, repeatedly at a predetermined interval of time while the detachable device remains connected to the host device, causing the switch to connect the node to the power source for a first length of time. The control circuit, at the end of the first length of time, checks a voltage level of the node in order to detect whether the detachable device has been disconnected from the host device.

REFERENCES:
patent: 5304987 (1994-04-01), Bunson et al.
patent: 5521586 (1996-05-01), Takeshita
patent: 5705976 (1998-01-01), Howard
patent: 5786769 (1998-07-01), Coteus et al.

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