STMicroelectronics AN3275 Application Note Improving Smartcard Interface Performance with ST8024L

About this manual

The document serves as a guide for using the ST8024L smartcard interface effectively. It details enhancements over the previous ST8024 device, such as improved noise sensitivity in the charge pump and a 1.8 V Voc output. The note explains how to implement card activation and deactivation procedures compliant with ISO/IEC7816-3, GSM11.11, and EMV 4.0 standards.

What's inside

• Activation/deactivation sequence
• Card clock configuration
• Emergency deactivation/fault detection
• Power supply optimization
• Clock section optimization
• Smartcard connections
• Input and output connections

Frequently asked questions

What are the key enhancements of the ST8024L compared to the ST8024?

The ST8024L features improved performance by reducing noise sensitivity in the charge pump, incorporates a 1.8 V Voc output, and has a lower V+ threshold voltage.

Which standards is the ST8024L compliant with?

The device complies with New Digital Systems (NDS), ISO/IEC7816-3, GSM11.11, and EMV 4.0.

How is the card clock duty cycle maintained during frequency changes?

The ST8024L ensures a 50% ±5% output duty cycle by waiting for the completion of a whole clock cycle before changing the frequency.