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Home > Interface and Driver Circuit
UTDA8024 Datasheet




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,






* 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, 4 or 8 through CLKDIV1 and CLKDIV2 signals) with synchronous frequency changes

* Non-inverted control of RST via pin RSTIN

* ISO 7816, GSM11.11 and EMV (payment systems)  Compatibility

* Enhanced ESD protection on card side (>6kV)

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