Smart Card Configuration Circuit for Power-Constrained Application Selection
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Solution Overview
Problem
Smart cards with both microchips and magnetic stripes face power consumption issues when configuring applications, as the magnetic stripe can only be selected and configured before insertion into a reader, using stored power that is insufficient for updating the stripe and powering the microchip.
Innovation Solution
A smart card configuration process that includes a control circuit to store dedicated information representative of the selected application, allowing the microchip to automatically retrieve and activate the application when powered, with options for internal or external memory storage and continuous data delivery to the microchip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the magnetic stripe is configured before card insertion using stored battery power, then the application selection can be made, but the battery power is insufficient for updating the magnetic stripe and powering the microchip simultaneously
Solution Approach 1:
The control circuit stores dedicated information representative of the selected application in advance (before microchip activation) in a memory element. This preliminary storage action allows the microchip to automatically retrieve and activate the correct application without requiring simultaneous powering of both the magnetic stripe update and microchip configuration, thus resolving the power consumption contradiction.
2Adaptability or versatility
If both microchip and magnetic stripe are powered simultaneously for configuration, then the application can be updated, but the power consumption is too high for battery-powered operation
Solution Approach 1:
The system performs the application selection and stores the dedicated information in advance using only the control circuit and memory, without activating the power-intensive microchip. This sequential approach where the microchip is activated only after the selection is made allows configuration capability while dramatically reducing power consumption.
Solution Approach 2:
The invention extracts the application selection function from the microchip and places it in the control circuit with a dedicated memory element. This separation allows the selection process to occur independently without requiring microchip power, thus reducing overall power consumption while maintaining configuration capability.
3Power
If the card is inserted into a reader for configuration, then sufficient power is available, but the magnetic stripe cannot be selected and configured before insertion
Solution Approach 1:
The control circuit is designed to store the dedicated information representing the selected application in a memory element before the card is inserted into the reader. This preliminary storage ensures that when the microchip is later activated by the reader, the application information is already available for automatic retrieval and activation, combining pre-insertion selection with post-insertion power availability.
Data Source
AI summary
A process is designed to configure a smart card (CP) comprising a microchip (PE) capable of participating in at least two applications, a magnetic stripe (PM) capable of storing information, action means (MA) capable of acting on the magnetic stripe (PM) to modify certain stored information, a control circuit (MC) capable of controlling the microchip (PE) and the action means (MA), and selection means (MS) capable of allowing the selection of an application. This process comprises a step wherein, if one of the applications is selected, a dedicated piece of information that is representative of that selected application is stored in a location accessible to the control circuit (MC), so that if the microchip (PE) is woken up, the microchip (PE) automatically retrieves the dedicated information in order to activate the selected application represented by it.