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Holtek Introduces BC45B4523- 13.56MHz Multi-Standard NFC Reader

The BC45B4523 is a single-chip reader ASIC for 13.56MHz NFC/contactless standard protocols, which provides the best solution for near field wireless communication applications such as access control locks, label readers, payment machines.

HolThe device supports and compatibles with all major global secured baseband ISO standards including ISO14443 Type A, Type B, Crypto_M cards and Smart label ISO15693.

The device provides a highspeed SPI controller/host interface with an integrated 64-byte FIFO for smooth data transfer.

Furthermore, the embedded codec is capable of handling all bitlevel coding/decoding, encrypting/decrypting as well as frame-level manipulation for transmission and reception.

The device is well suited for mobile devices due to its low power consumption and low operating oltage from 2.7V to 3.6V. The ultra-low power onchip 3.3V regulator is provided to stabilize the device power, and simultaneously supply power of up to 150mA to the external companion microcontroller.

The BC45B4523 receiver circuit has integrated a full AGC loop allowing a wide dynamic range of RF input signal levels. The excellent sensitivity performance of the device enables detection of the input signals with amplitudes as low as 1mVpp without distorting the data integrity.

The receiver filters can be selected optionally either to a predefined band in accordance with the generic required standard setup, or to an arbitrarily defined combination which gives flexibility to cope with various antenna variations/parameters. The baseband circuits permit the inbound/outbound configuration to accept various forms of customized protocols, incoming to the chip and outgoing to the external RF circuitry in the application specific-design system.

The transmitter is capable of accepting a wide range of operating supply voltages to serve various applications, e.g., 5V for base stations or desktop readers, and 3.3V for handheld devices. The transmission controller is entirely used to support all operation status and requests, including FIFO status full/high/low and transmission complete flag. The transmitter drivers support a wide range of power supply voltages from 2.7V to 5.5V. A high drive current up to 250mA is guaranteed for demanding item-level mid-range reader designs.

The dual high-powered transmitters can be flexibly configured in various configurations, e.g. differential driving, single-ended driving and a mode to drive an external Class-E amplifier for improving the drive strength in the gate antenna setup.

The BC45B4523 contains efficient power saving modes: Hard Power Down, Soft Power Down, Standby and low-power Card Detection modes. The low-power Card Detection mode allows the device to not operate at full power continuously. The device periodically detects external card. If an external card is detected, interrupt signal will be sent to MCU to wake up the system.

To facilitate operation of the companion microcontroller, the BC45B4523 is fully equipped with on-chip peripheral support devices such as an RF-trig timer, a host interrupt generator and a clock divider. The BC45B4523 is offered in a QFN package with excellent heat dissipation when self-mounted on PCB.

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Nitisha Dubey

I am a Journalist with a post graduate degree in Journalism & Mass Communication. I love reading non-fiction books, exploring different destinations and varieties of cuisines. Biographies and historical movies are few favourites.

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