TDA8024AT/C1,118

Specialized Overview

The TDA8024AT/C1,118 is a complete analog interface for asynchronous 3 V or 5 V smart cards. It performs supply, protection, and control functions between the card and microcontroller. The device features a DC-to-DC converter generating regulated VCC from a separate 5 V ± 20% supply (VDDP). It includes three protected half-duplex bidirectional buffered I/O lines to contacts C4, C7, and C8. An integrated 26 MHz crystal oscillator supports clock generation up to 20 MHz. Supply voltages are VDD (2.7 V to 6.5 V) and VDDP (4.0 V to 6.5 V). Total power dissipation is 0.56 W at -25 °C to +85 °C.

Specialized Feature Summary

• Provides ISO 7816, GSM11.11, and EMV compatibility with automatic activation and deactivation sequences.
• Includes enhanced ESD protection on card side exceeding 6 kV and thermal/short-circuit protection on all contacts.
• Features built-in debounce on card presence contacts and a multiplexed status signal output.

Specialized Applications

• IC card readers for banking
• Electronic payment systems
• Identification devices
• Pay TV terminals

Specialized Procurement Notes

Verify the ordering suffix matches the required package variant. Confirm that the AT designation indicates the absence of the external PORADJ pin compared to standard versions. Ensure the component meets RoHS compliance requirements for the specific manufacturing batch.

Specialized Selection Notes

Select this part when a direct replacement for the TDA8004AT is needed. Verify system controller voltage levels match the 2.7 V to 6.5 V range. Ensure the design accommodates the separate VDDP supply requirement for the internal DC-to-DC converter.

Specialized Part Context

This component belongs to the NXP TDA8024 series of standard smart card interfaces. It serves as a cost-efficient solution for managing contact smart card operations. The AT variant specifically omits the Power-on Reset adjustment pin found in other models within the same family.

Specialized Replacement Considerations

TDA8004AT is documented as a predecessor compatible with this interface function.

Specialized FAQ

Does the TDA8024AT support external Power-on Reset threshold adjustment?

No, the TDA8024AT does not have a connected PORADJ pin; the reset threshold is fixed internally.

What is the maximum supported card clock frequency?

The device supports clock generation for cards up to 20 MHz using the integrated 26 MHz oscillator.