NFC two-way communication 13.56MHz contactless reader chip -- si512 replaces pn512

RFID (RFID) Technology in the field of contactless card reading such as hotel door locks , The existing schemes generally have large card reading current , Susceptible to external interference , Thus causing the chip to fly . Based on this market situation , The new 13.56MHz Contactless reader chip –Si512, It has the industry-leading ultra-low power automatic card detection function , Reduce the overall current of the smart door lock to the minimum .

Si512 It's a highly integrated NFC front end , Support 13.56MHz A variety of initiatives under / Passive mode contactless communication method and protocol , newly added ACD Automatic carrier detection function ,2.9uA The current of automatic card searching is the lowest in the industry ！ Whole ACD Process no MCU intervention , In smart handset , Hotel door locks and other fields can achieve more than one year long standby time .

Si512 Breakthrough in technical characteristics ：

1） Support ACD Pattern （ Automatic carrier detection function ）,500ms Under polling cycle , The current is about 2.9uA.ACD In mode , The chip is dormant most of the time , from 3K RC Wake up regularly , Detect with very low power consumption 13.56MHz RF field and RF card , Detect the presence or the card automatically generates interrupt wake-up MCU. The functions of detection field and card can be enabled separately ;

2） Support 5 Working mode ：

Reader mode , Support ISO 14443A/MIFARE and Felica

Reader mode , Support ISO 14443B

Card emulation mode , Support ISO 14443A/MIFARE and Felica

NFCIP-1 Pattern

ACD Pattern , Automatic card detection and field detection with very low power consumption

3） No need for peripheral circuits ,Si512 The internal transmitter can drive the reader antenna and ISO/IEC 14443 A/B/MIFARE The card communicates with the transponder ;

4） The card swiping distance is far , Better card swiping experience

NFCIP-1 The typical working distance under mode can be up to 50mm（ See the length and tuning of the antenna , And power supply ）

ISO 14443A/MIFARE Card and Felica The typical working distance in card analog mode is 100mm about （ See the length and tuning of the antenna , And the strength of the external field ）

5）ACD In mode , adopt Si512 Internal hardware watchdog monitoring , It can ensure that the chip works stably in harsh working environment . Under external interference , Even if the configuration value of the chip register is lost or the antenna field strength is accidentally turned off , It will also immediately generate interrupt wakeup MCU Reconfiguration , Never crash .

Application field ：

Smart handset

Hotel door lock

Intelligent access control system

POS Terminal products

Intelligent toy

Supporting products – Touch chip Si14T（12T）

Si14T（12T） It is a with automatic sensitivity calibration function 14 passageway （12 passageway ） Capacitive sensors , Its working voltage range is 1.8~5.0 V.

Si14T（12T） Set sleep mode to save power , here , The power consumption current is 3.5 µA @3.3 V.

Si14T（12T） It has two special functions ： In the channel 1 Embedded power key function on , It can be applied to mobile phones ; in addition , The chip has touch pause detection function , adopt SCT Foot and Si512/522/523 Card swiping chip cooperation , Greatly reduces the chance of false triggering , It is very suitable for intelligent door lock and other applications .

I2C The serial interface can detect the result of touch sensing , Touch intensity can be detected , Divide into low 、 There are three results of neutralization and high .