Patent ID: 7348760

Claim:
A wake up circuit comprising: a comparison circuit configured to receive a first signal representative of a charging current level provided to a battery via a path and a second programmable signal representative of a predetermined wake up current level and to provide a comparison output signal in response to said first and second signals; and an output decision circuit configured to receive at least said comparison output signal and a selector signal from a selector circuit, said output decision circuit is configured to provide one of said comparison output signal or said selector signal to a switch to control the charging current level provided to said battery by controlling the state of said switch-coupled to said path; wherein said comparison output signal comprises an analog signal, said switch responsive to said analog signal to enter an intermediate conduction state to provide a current level to said battery representative of said predetermined wake up current level; and wherein said selector signal comprises a first state and a second state, said switch is responsive to said first state to enter a full conduction state and responsive to said second state to turn off said switch.