STMicroelectronics MCUs Support Calypso Rev. 3

STMicroelectronics (ST) has released a new secure microcontroller (MCU) that supports the latest version of the Calypso ticketing open standard. The CD21-Rev3 chip supports extra, innovative services and offers backward compatibility with legacy Calypso readers, allowing operators to introduce next-generation cards quickly and cost effectively.

Electronic ticketing has been widely adopted in urban transport networks worldwide, successfully speeding up transactions, reducing queuing and lowering costs. The Calypso ticketing open standard, developed by a consortium of European operators to suit public transportation and other ticketing uses, is now utilized in more than 80 networks in 21 countries, with more than 52 million cards issued. Calypso Revision 3 delivers extra services such as e-purse, loyalty rewards or USB key.


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Building upon the success of ST’s CD21-2K and CD21-8K products, the ST23 core-based CD21-Rev3 MCUs are the only Calypso Revision 3 solution produced by a non-card issuer. As such, it provides independence and reliability for system users and developers, enabling rapid, cost-effective adoption of Calypso Revision 3 in mass-transit networks worldwide.

ST's CD21-Rev3 solution is based on a secure MCU that is certified compliant with all necessary and appropriate standards, including the EMV global standard, and achieves EAL5+ Common Criteria security assurance. It also meets the established ISO/IEC 14443 and ISO/IEC 7816 smart-card standards and is compliant with the EMVCo Level 1 radio interface specification.

The MCUs also feature dual interface for contact or contactless applications, and are available with 4kB, 8kB or 18kB EEPROM density.

STMicroelectronics