NXP Semiconductors TDA8034T/C1,112

Overview

TDA8034T/C1,112 from NXP Semiconductors is a smart card interface IC in SO16 package that provides regulated 5 V or 3 V supply, protected bidirectional I/O (C7), thermal/short-circuit protection, and ISO 7816-compliant clock/reset generation for microcontroller-based card readers. It integrates LDO regulation, ESD protection >6 kV, and automatic activation/deactivation sequencing.

For engineers reviewing the TDA8034T/C1,112 datasheet, TDA8034T/C1,112 pinout, TDA8034T/C1,112 application, or TDA8034T/C1,112 equivalent, key selection criteria include VCC regulation accuracy (±5 %), synchronous clock division (1⁄2 or 1⁄4 fxtal), built-in debouncing (4.5 ms), fault detection on VDDP/VDD drop, and compatibility with EMV 4.2 and NDS payment systems.

Technical Context

The TDA8034T/C1,112 implements an integrated analog front-end with dual-supply architecture: VDDP (4.85–5.5 V) powers the LDO regulator for VCC, while VDD (2.7–3.6 V) and VDD(INTF) (1.6–3.6 V) feed digital and interface logic. Its internal oscillator operates at 100–200 kHz in shutdown mode and 2–3.2 MHz during activation.

It supports two clock sources-external input up to 26 MHz on XTAL1 or crystal oscillator (2–26 MHz between XTAL1/XTAL2)-with automatic source detection triggered by CMDVCCN falling edge. Clock output on CLK is synchronized and configurable via CLKDIV1 to deliver 1⁄2 fxtal or 1⁄4 fxtal (TDA8034T variant).

Key Specifications

Pinout & Package

Package: SO16 plastic small outline package (SOT109-1), 16 leads, body width 3.9 mm, thermal resistance R_th(j-a) = 94 K/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart card interface applications.

Compared with SLB9670 and TDA8029T, the TDA8034T/C1,112 uniquely combines auto-selectable 3 V/5 V supply, 6 kV ESD protection, and synchronous clock division - making it optimal for new EMV 4.2 and NDS-certified payment and ID terminals requiring minimal external components and robust hot-swap behavior.

Availability

TDA8034T/C1,112 is available at Aetrix Electronics and suitable for Pay TV conditional access modules, EMV payment terminals, and government eID readers requiring stable component supply, long-term lifecycle support, and full ISO 7816 compliance.

Supply support for TDA8034T/C1,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and identification markets, with deep expertise in smart card and secure element technologies.

The TDA8034T/C1,112 belongs to NXP's smart card interface product line, engineered specifically for high-reliability, low-component-count contact card readers in payment, ID, and conditional access applications.

FAQ

What voltage options does the TDA8034T/C1,112 support for smart card supply?

The TDA8034T/C1,112 automatically selects between 5 V ±5 % and 3 V ±5 % card supply voltages based on the high-time duration of the CMDVCCN signal: >30 ms enables 5 V mode, <15 ms enables 3 V mode, and intermediate durations require a specific pulse sequence. This eliminates manual configuration and supports dual-voltage card fleets in a single design.

How does the TDA8034T/C1,112 handle clock source selection between crystal and external input?

The TDA8034T/C1,112 performs automatic clock source detection on each CMDVCCN falling edge: if a valid clock signal (0–26 MHz) is present on XTAL1, the internal crystal oscillator is disabled; otherwise, it starts the crystal oscillator between XTAL1 and XTAL2. No external pin or register setting is needed - simplifying layout and firmware.

What protection features does the TDA8034T/C1,112 provide for smart card contacts?

The TDA8034T/C1,112 provides thermal and short-circuit protection on all card contacts (VCC, I/O, RST, CLK, PRESN), ESD protection exceeding 6 kV HBM on card pins, and filtered overload detection (~120 mA threshold). Faults trigger immediate, controlled deactivation - preserving card integrity and preventing system lockup.

Is the TDA8034T/C1,112 compatible with EMV 4.2 and ISO 7816 standards?

Yes, the TDA8034T/C1,112 is explicitly designed for and compliant with ISO 7816-3 (electrical interface), ISO 7816-4 (commands), and EMV 4.2 payment system requirements. Its precise clock timing, reset assertion/deassertion windows, and voltage regulation meet all mandatory timing and electrical parameters for certification.

What is the purpose of the OFFN pin on the TDA8034T/C1,112?

The OFFN pin is an NMOS open-drain interrupt output that goes LOW during faults including card removal, VDD/VDDP dropout, short-circuit on VCC, or overheating. It alerts the microcontroller to initiate emergency deactivation, enabling rapid recovery and status logging without polling - critical for secure transaction integrity in payment terminals.