AT83C24-TISIL

Specialized Overview

The AT83C24 is a smart card reader interface IC designed for EFT/POS terminals and set-top boxes. It supports ISO 7816, EMV2000, GIE-CB, GSM, and WHQL standards with programmable voltage outputs of 5V ±5% at 65 mA (Class A), 3V ±0.2V at 65 mA (Class B), or 1.8V ±0.14V at 40 mA. The device features an integrated high-efficiency DC/DC converter (80-98%) and operates on a single VCC supply ranging from 2.85V to 5.5V. Communication with the host is managed via a Two-Wire Interface (TWI) supporting up to 400 Kbits/s, allowing up to eight devices on one bus. It includes an 8kV+ ESD protection system, low power consumption (150 µA typical in shutdown), and operates within an industrial temperature range of -40°C to +85°C.

Specialized Feature Summary

• Compliance with major smart card standards including ISO 7816, EMV2000, and GSM.
• Integrated high-efficiency step-up DC/DC converter reducing bill of materials.
• Two-wire interface (TWI) allows parallel connection of up to eight devices.
• Advanced protection system featuring short circuit current limitation and 8kV+ ESD immunity.

Specialized Applications

• Electronic Fund Transfer (EFT) terminals
• Point of Sale (POS) systems
• Set-top boxes

Specialized Procurement Notes

Verify the specific package suffix against the datasheet requirements. The 'SIL' suffix typically denotes a leaded tape-and-reel option for SOIC packages, distinct from standard tube packaging. Confirm that the ordering code matches the required reel quantity and RoHS compliance status specified by the manufacturer for production runs.

Specialized Selection Notes

Select this component when a single-supply smart card interface is required with integrated power management. Ensure the host microcontroller supports the TWI protocol for configuration. Verify that the application environment stays within the -40°C to +85°C operating range and that the required card voltage class (A or B) aligns with the device's output capabilities.

Specialized Part Context

The AT83C24 belongs to Microchip's family of smart card reader interface controllers. It serves as a bridge between host processors and smart cards, handling complex activation sequences and power regulation. This series is widely used in secure transaction environments where reliable card detection and standardized communication protocols are mandatory.

Specialized Replacement Considerations

Consult official Microchip documentation for direct pin-compatible substitutes. Cross-reference part numbers such as the AT83C26 or AT83C64 if higher memory or different interface options are needed, ensuring all electrical parameters remain compatible.

Specialized FAQ

How does the AT83C24 handle multiple devices on the same bus?

Up to eight AT83C24 devices can be connected in parallel using the Two-Wire Interface (TWI). Each device is assigned a unique address based on the logic levels present on the A2, A1, and A0 pins during reset.

What is the function of the CMDVCC pin?

The CMDVCC pin controls the activation and shutdown of the smart card interface. Transitioning this pin from High to Low initiates the hardware activation sequence, while transitioning it from Low to High triggers the deactivation sequence.

Can the device operate without the internal DC/DC converter?

Yes, the LI pin can be directly connected to VCC if the step-up converter is not utilized. In this configuration, the external coil is omitted, and the device relies on the external VCC supply for card voltage generation.