TDA8007B

· Control and communication through an 8-bit parallel interface, compatible with multiplexed or non-multiplexed    memory access
· Specific ISO UART with parallel access on I/O for automatic convention processing, variable baud rate through  frequency or division ratio programming, error management at character level for T = 0, extra guard time register
· 1 to 8 characters FIFO in reception mode
· Parity error counter in reception mode
· Dual VCC generation (5 V ±5%, 65 mA (max.) or 3 V ±8%, 50 mA (max.) with controlled rise and fall times)
· Dual cards clock generation (up to 10 MHz), with two times synchronous frequency doubling
· Cards clock STOP HIGH, clock STOP LOW or 1.25 MHz (from internal oscillator) for cards Power-down mode
· Automatic activation and deactivation sequence through an independent sequencer
· Supports the asynchronous protocols T = 0 and T = 1 in accordance with ISO 7816 and EMV
· Versatile 24-bit time-out counter for Answer To Reset (ATR) and waiting times processing
· 22 Elementary Time Unit (ETU) counter for Block Guard Time (BGT)
· Supports synchronous cards
· Current limitations in the event of short-circuit
· Special circuitry for killing spikes during power-on/-off
· Supply supervisor for power-on/-off reset
· Step-up converter (supply voltage from 2.7 to 6 V), doubler, tripler or follower according to VCC and VDD
· Additional I/O pin allowing use of the ISO UART for another analog interface (pin I/OAUX)
· Additional interrupt pin allowing detection of level toggling on an external signal (pin INTAUX)
· Fast and efficient swapping between the 3 cards due to separate buffering of parameters for each card
· Chip select input allowing use of several devices in parallel and memory space paging
· Enhanced ESD protections on card side [6 kV (min.)]
· Software library for easy integration within the application
· Power-down mode for reducing current consumption when no activity.

The TDA8007B is a low cost card interface for dual smart card readers. Controlled through a parallel bus, it takes care of all ISO 7816, EMV and GSM11-11 requirements. It may be interfaced to the P0/P2 ports of a 80C51 family microcontroller, and be addressed as a memory through MOVX instructions. TDA8007B may also be addressed on a non-multiplexed 8-bit data bus, by means of address registers AD0, AD1, AD2 and AD3. The integrated ISO UART and the time-out counters allow easy use even at high baud rates with no real time constraints. Due to its chip select and external I/O and INT features, it greatly simplifies the realization of any number of cards readers. TDA8007B gives the cards and the reader a very high level of security, due to its special hardware against ESD, short-circuiting, power failure, etc. Its integrated step-up converter allows operation within a supply voltage range of 2.7 to 6 V.

A software library has been developed, taking care of all actions required for T = 0, T = 1 and synchronous protocols (see application reports).