TDA8025 Datasheet, PDF(1/38 Page) NXP Semiconductors

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TDA8025 Datasheet, PDF (1/38 Pages) NXP Semiconductors – IC card interface

TDA8025

IC card interface

Rev. 01 â 6 April 2009

Product data sheet

1. General description

The TDA8025 is a cost-effective analog interface for asynchronous smart cards operating

at 3 V, 1.8 V or optionally, 1.2 V. Using few external components, the TDA8025 provides

integrated supply, protection and control functions for a range of applications.

2. Features

I Integrated circuit smart card interface

I 3 V, 1.8 V or 1.2 V smart card supply

I Low power consumption in inactive mode

I Three protected, half duplex, bidirectional buffered input/output lines (C4, C7 and C8)

I VCC regulation:

N 3 V, 1.8 V or optionally 1.2 V at Â± 5 % using one 220 nF and one 470 nF low ESR

multilayer ceramic capacitor.

N Current pulse handling for pulses of 40 nAs at VCC = 3 V, 15 nAs at VCC = 1.8 V or

VCC = 1.2 V up to 20 MHz

I Thermal and short-circuit protection for all card contacts

I Automatic activation and deactivation sequences triggered by short-circuit, card

take-off, overheating, falling VDD(INTF) and VDD(INTREGD)

I Enhanced card-side ElectroStatic Discharge (ESD) protection of > 6 kV

I Clock signal using the internal oscillator or an external crystal (â¤ 26 MHz) connected to

pin XTAL1

I Card clock generation up to 20 MHz with synchronous frequency changes of fxtal,

1â2 fxtal, 1â4 fxtal or 1â8 fxtal using pins CLKDIV1 and CLKDIV2

I Non-inverted control of pin RST using pin RSTIN

I NDS certiï¬ed

I Supply supervisors during power on and off:

N VDD(INTREGD) using a ï¬xed threshold

N VDD(INTF) using resistor bridge threshold adjustment

I Built-in debouncing on card presence contacts (typically 4.5 ms)

I Multiplexed status signal using pin OFFN

3. Applications

I Pay TV

I Electronic payment

I Identiï¬cation

I Bank card readers

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