UTDA8024

UNISONIC TECHNOLOGIES CO., LTD UTDA8024 Preliminary LINEAR INTEGRATED CIRCUIT IC CARD INTERFACE  DESCRIPTION The UTC UTDA8024 is analog interface IC for 3V or 5V smart cards. It is placed between the card and the microcontroller to perform communication, control function, all supply and protection functions. It requires very few external components for application. It can be applied in many fields, such as IC card readers for banking, pay TV, Identification, Electronic payment, etc.  FEATURES * Three specifically protected half-duplex bidirectional buffered I/O lines to card contacts C4, C7 and C8 * 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 * 26MHz integrated crystal oscillator * DC/DC converter for VCC generation separately powered from a 5 V ± 20% supply (VDDP and PGND) * 3V or 5V ± 5% regulated card supply voltage (VCC) with appropriate decoupling has the following capabilities: - ICC<80mA at VDDP=4~6.5V - Handles current spikes of 40nAs up to 20MHz - Controls rise and fall times - Filtered overload detection at approximately 120mA * Built-in debounce on card presence contacts * Supply supervisor for spike-killing during power-on and power-off and Power-on reset (threshold fixed internally or externally by a resistor bridge) * Thermal and short-circuit protection on all card contacts * Clock generation for cards up to 20MHz (divided by 1, 2, ...