1. General description
The TDA8034T/TDA8034AT is a cost-effective analog interface for asynchronous and
synchronous smart cards operating at 5 V or 3 V. Using few external components, the
TDA8034T/TDA8034AT provides all supply, protection and control functions between a
smart card and the microcontroller.
2. Features and benefits
Integrated circuit smart card interface in an SO16 package
5 V or 3 V smart card supply
One protected half-duplex bidirectional buffered I/O line (C7)
V
CC
regulation:
5V 5 % or 3 V 5 % using two low ESR multilayer ceramic capacitors: one of
220 nF and one of 470 nF
current spikes of 40 nA/s (V
CC
= 5 V and 3 V) or 15 nA/s (V
CC
=1.8 V) up to
20 MHz, with controlled rise and fall times and filtered overload detection of
approximately 120 mA
Thermal and short-circuit protection for all card contacts
Automatic activation and deactivation sequences triggered by a short-circuit, card
take-off, overheating, falling V
DD
, V
DD(INTF)
or V
DDP
Enhanced card-side ElectroStatic Discharge (ESD) protection of > 6 kV
External clock input up to 26 MHz connected to pin XTAL1
Card clock generation up to 20 MHz using pin CLKDIV1 with synchronous frequency
changes of:
1
⁄
2
f
xtal
or
1
⁄
4
f
xtal
on TDA8034T
f
xtal
or
1
⁄
2
f
xtal
on TDA8034AT
Non-inverted control of pin RST using pin RSTIN
Compatible with ISO 7816, NDS and EMV 4.2 payment systems
Supply supervisor for killing spikes during power on and off:
using a fixed threshold
using an external resistor bridge with threshold adjustment
Built-in debouncing on card presence contacts (typically 4.5 ms)
Multiplexed status signal using pin OFFN
3. Applications
Pay TV
Electronic payment
TDA8034T; TDA8034AT
Smart card interface
Rev. 3.1 — 13 December 2012 Product data sheet
