Datasheet

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
n Integrated circuit smart card interface
n 3 V, 1.8 V or 1.2 V smart card supply
n Low power consumption in inactive mode
n Three protected, half duplex, bidirectional buffered input/output lines (C4, C7 and C8)
n V
CC
regulation:
u 3 V, 1.8 V or optionally 1.2 V at ± 5 % using one 220 nF and one 470 nF low ESR
multilayer ceramic capacitor.
u Current pulse handling for pulses of 40 nAs at V
CC
= 3 V, 15 nAs at V
CC
= 1.8 V or
V
CC
= 1.2 V up to 20 MHz
n Thermal and short-circuit protection for all card contacts
n Automatic activation and deactivation sequences triggered by short-circuit, card
take-off, overheating, falling V
DD(INTF)
and V
DD(INTREGD)
n Enhanced card-side ElectroStatic Discharge (ESD) protection of > 6 kV
n Clock signal using the internal oscillator or an external crystal (≤ 26 MHz) connected to
pin XTAL1
n Card clock generation up to 20 MHz with synchronous frequency changes of f
xtal
,
1
⁄
2
f
xtal
,
1
⁄
4
f
xtal
or
1
⁄
8
f
xtal
using pins CLKDIV1 and CLKDIV2
n Non-inverted control of pin RST using pin RSTIN
n NDS certified
n Supply supervisors during power on and off:
u V
DD(INTREGD)
using a fixed threshold
u V
DD(INTF)
using resistor bridge threshold adjustment
n Built-in debouncing on card presence contacts (typically 4.5 ms)
n Multiplexed status signal using pin OFFN
3. Applications
n Pay TV
n Electronic payment
n Identification
n Bank card readers
TDA8025
IC card interface
Rev. 01 — 6 April 2009 Product data sheet