Quiescent current consumption reducing method for e.g. microprocessor of smartcard, involves connecting inactive electronic circuit with power supply during exceeding of another threshold temperature

摘要

#CMT# #/CMT# The method involves contactlessly disconnecting an inactive electronic circuit (2) e.g. microprocessor, from a power supply (Vcc) during exceeding of threshold temperature, where a plastic housing (3) is provided for accommodating the electronic circuit. The electronic circuit is connected with the power supply during exceeding of another threshold temperature, which is smaller than the former threshold temperature. A temperature sensitive switch element (7) i.e. bimetallic switch is utilized for selective disconnection and connection of the electronic circuit with the power supply. #CMT# : #/CMT# An independent claim is also included for a portable data carrier comprising a contactlessly activatable switch device. #CMT#USE : #/CMT# Method for reducing quiescent current consumption of an inactive electronic circuit e.g. microprocessor, of a portable data carrier (claimed) e.g. chip card such as smartcard and microprocessor chip card, token or chip module for installation in the chip card or chip token, and data processing system, during production of the data carrier. #CMT#ADVANTAGE : #/CMT# The method prevents the power supply present in the portable data carrier from being unnecessary discharged by temperature limited leakage current of the electronic circuit, during occurrence of high temperature in the data carrier manufacturing process. The inactive electronic circuit is connected with the power supply during exceeding of the threshold temperature, such that resetting of the electronic circuit is achieved in a simple manner, without requiring an additional element for resetting, thus reducing manufacturing cost of the portable data carrier. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic block diagram of a portable data carrier. Vcc : Power supply 1 : Portable data carrier 2 : Inactive electronic circuit 3 : Plastic housing 7 : Temperature sensitive switch element #CMT#INDUSTRIAL STANDARDS : #/CMT# The portable data carrier conforms to standard International organization for standardization 7810.