Implementing high-speed near field communication (NFC) between two independent devices has been made easier with the introduction of the AS3953 interface chip from ams. The IC offers a high data-rate, bidirectional interface between an NFC device such as a smartphone and any host microcontroller with a standard serial peripheral interface (SPI).
Operating on energy harvested from an NFC reader’s RF emissions, the AS3953 NFiC (near field communications interface chip) requires no external power source and at most one external component (a capacitor).
The device is fully compliant with NFC Forum specifications (NFCIP-1 target at 106 Kbps) and the ISO14443A industry standard (up to 848 Kbps, to Level 4). This means that it can be used in contactless smartcards and as an NFC Forum-compatible interface tag, and can establish instant communication with any NFC-enabled phone in close proximity (<10 cm).
The AS3953 is expected to find uses in a wide variety of applications, including contactless passive programming of MCU-based systems, smartcards with displays, smart retail shelf labels, sensors and ultra low-power data loggers, medical devices and secured NFC Bluetooth pairing.
It can also enable innovative new approaches to system designs by using an NFC-enabled smartphone as a display host and system controller for normally standalone devices, eliminating the requirement for the slave device to have its own display and processor.
The IC features a configurable wake-up interrupt, enabling a zero-power system design while shut down. It also contains a complete analog front end, 1 KB of internal EEPROM, and a 4-wire SPI with a 32-Byte FIFO.
The device can draw up to 5 mA of harvested energy from the external magnetic field, and includes an internal power management circuit that can supply harvested energy to the application. This makes it ideal for use with battery-powered and portable microcontroller-based devices.
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