TDA8024
Overview
The TDA8024 is a complete and cost-efficient analog interface for asynchronous 3 V or 5 V smart cards. It can be placed between the card and the microcontroller to perform all supply, protection and control functions.
- IC card interface
- 3 V or 5 V supply for the IC (VDD and GND)
- Three specifically protected half-duplex bidirectional buffered I/O lines to card contacts C4, C7 and C8
- DC-to-DC converter for VCC generation separately powered from a 5 V 20% supply (VDDP and PGND)
- 3 V or 5 V 5% regulated card supply voltage (VCC) with appropriate decoupling has the following capabilities:; ICC < 80 mA at VDDP = 4 V to 6.5 V; Handles current spikes of 40 nAs up to 20 MHz; Controls rise and fall times; Filtered overload detection at approximately 120 mA
- Thermal and short-circuit protection on all card contacts
- Automatic activation and deactivation sequences; initiated by software or by hardware in the event of a short-circuit, card take-off, overheating, VDD or VDDP drop-out
- Enhanced ESD protection on card side (>6 kV)
- 26 MHz integrated crystal oscillator
- Clock generation for cards up to 20 MHz (divided by 1, 2, 4 or 8 through CLKDIV1 and CLKDIV2 signals) with synchronous frequency changes
