(54) APPARATUS FOR POWERING ON BY PUSHING RANDOM KEY
(75) Inventor: Heui-Do Lim, Suwon-shi (KR)
(73) Assignee: Samsung Electronics Co., Ltd (KR)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 410 days.
(21) Appl. No.: 10/316,597
(22) Filed: Dec. 11, 2002
(65) Prior Publication Data
US 2003/0107501 Al Jun. 12, 2003
(30) Foreign Application Priority Data
Dec. 12, 2001 (KR) 2001-78420
(51) Int. CI.
H02B 1/22 (2006.01)
G06F 3/02 (2006.01)
(52) U.S. CI 307/115; 713/310; 341/22
(58) Field of Classification Search 307/115,
307/113,114; 713/310,300; 341/20,22;
200/5 R, 329, 520, 341 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
3,534,904 A * 10/1970 Kalthoffetal 234/48
An apparatus for powering on a terminal with a keypad by randomly selecting any key of the keypad. The keypad includes a plurality of keys, each of which has at least one set of contacts. The apparatus comprises a device controlled in such a manner as to be enabled to receive a battery voltage and supply a system voltage, a controller for, upon sensing a random key selection, generating a power on/off signal of a first state to continuously supply power to the terminal until a power off state is sensed and, upon sensing a power on state, generating a key on/off signal of a first state to operate subsequent input keys as general keys, and a key array switch including a plurality of first switches each for connecting one of the two contacts of each key arrayed in a corresponding row to the battery voltage, and a plurality of second switches each for connecting the other contact of each key arrayed in a corresponding column to an enable terminal of the system voltage supply device, the key array switch being disabled in response to the key on/off signal of the first state.
6 Claims, 3 Drawing Sheets