ENHANCED BATTERY RECOGNITION SCHEMES
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-23
Existing battery recognition schemes use one capacity resistor (Rc) to define the battery type/ capacity which is limited to thirteen possible values that can be resolved. As different battery chemis- tries and capacities continue to increase in number, the need for additional definable battery type/capaci- ties are needed. The inventions below provide a means of expanding this battery type recognition scheme. In approach one this is done by detecting two independent capacity resistors (Rcl and Rc2) without adding any additional contacts and still being able to read the thermistor (Rt) without any loss of resolution to the temperature sensing circuit. In approach two this is done by switching between two independent capacity resistor (Rc) ranges by using two independent pull up resistors in the charger.