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‌CXRS3134B Smart Card Reader ICs: A Technical Explanation and Application Guide‌

‌Product overview‌

CXRS3134B is a JTM-IC high-performance contact smart card reader IC designed for payment systems, identification and banking terminals. Support5V/3V/1.8V multi-voltage supply, integrated LDO regulator, provides65mA Continuous Output Currentand has short circuit protection, ESD protection (>8kV) and thermal shutdown function. Its core strengths include:hoZ嘉泰姆

• ‌Wide voltage input: 3V-5.5V working range, compatible with USB and adapter power supply.
• ‌Triple protection mechanismShort circuit detection (120mA threshold), card pull out detection, undervoltage lockout (UVLO).
• ‌Low power design: The quiescent current is only 0.1 μA in deep shutdown mode.

‌Core Features‌

1. ‌High security design‌hoZ嘉泰姆

   • ISO 7816, EMV 4.3 and NDS compliant for POS terminals and authentication devices.
   • Integrated LDO regulator, support 5V/3V/1.8V card power supply, voltage accuracy ± 5%.
   • Automatic activation/deactivation sequence to prevent power fluctuations from damaging the smart card.

2. ‌Multiple protection functions‌hoZ嘉泰姆

   • ‌ESD protectionCard interface pin withstand voltage ± 8kV(HBM model).
   • ‌Thermal protection: Automatic shutdown when junction temperature exceeds 150°C.
   • ‌Short circuit protectionSupports 40nA/s transient current pulses (5V/3V) and 15nA/s(1.8V).

3. ‌Compact package and ease of use‌hoZ嘉泰姆

   • ‌HVQFN24 package(4mm × 4mm), built-in thermal pad, & theta;JA = 53 K/W.
   • The periphery only needs 6 capacitors (including 220nF 470nF VCC decoupling capacitor) and supports 2-26MHz external clock input.

‌Typical Application Circuit‌

• ‌Power Management‌：VDDP（4.85V-5.5V）→ LDO稳压器 → VCC（5V/3V/1.8V）
• ‌Card InterfaceIntegrated buffered I/O lines (C4/C7/C8) supporting 1MHz data transfer rate.
• ‌Status indication: Output fault signal (short circuit/overheat/undervoltage) through the OFFN pin.

‌Design Considerations‌

1. ‌PCB Layout Optimization‌hoZ嘉泰姆

   • VCC decoupling capacitor needs to be close to the chip pin, ESR<100mΩ.
   • XTAL1/XTAL2 traces away from high-frequency noise sources, and 56pF capacitors are recommended in series.

2. ‌Thermal Management‌hoZ嘉泰姆

   • It is recommended to use copper foil for heat dissipation to avoid junction temperature exceeding 125°C.

‌Industry Application Scenarios‌

• ‌Electronic Payment: POS terminal, bank card reader.
• ‌Identity Authentication: Access control system, electronic passport reading.
• ‌IoT SecuritySIM card interface module.

‌Why choose JTM-IC?‌

As a professional IC supplier, JTM-IC (official website:jtm-ic.com) provides:hoZ嘉泰姆

• ‌Full range of EMV compliant productsSupport fast customer authentication.
• Reference design and technical support to shorten the time to market.

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