ST8024
Overview
The ST8024 is a complete low cost analog interface for asynchronous 3 V and 5 V smart cards. It can be placed between the card and the microcontroller with few external components to perform all supply protection and control functions.
- Designed to be compatible with the NDS conditional access system
- IC card interface
- 3 or 5 V supply for the IC (VDD and GND)
- Three specifically protected half-duplex bi- directional buffered I/O lines to card contacts C4, C7 and C8
- DC-DC converter for VCC generation separately powered from a 5 V ± 20% supply (VDDP and PGND)
- 3 or 5 V ± 5 % regulated card supply voltage (VCC) with appropriate decoupling has the following capabilities: - ICC < 80 mA at VDDP = 4 to 6.5 V - Handles current spikes of 40 nA 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
