Patent ID: 7323795
Filing Date: 2008-01-29
Classification: G06F,H03M

Abstract:
1. An apparatus for powering on a terminal by a random key selection, comprising: a keypad including a plurality of keys, wherein each key has two contacts that electrically connect upon said random key selection by a user to create an enable signal; a regulator that receives a battery voltage and supplies a system voltage in response to the enable signal; a controller for, upon sensing the random key selection, generating a power on/off signal of a first state to continuously supply power to said terminal until a power off state is sensed and, upon sensing the random key selection, generating a key on/off signal of a first state to operate utilizing subsequent input received from said plurality of keys as general keys; and a key array switch including: a plurality of first switches for connecting one contact of each key in a row of keys to said battery voltage and a plurality of second switches for connecting the other contact of each key in a column of keys to an enable input of said regulator, all of the first and second switches simultaneously being in one of a closed state and an open state.