Instructions

NFC &

MIFARE & ISO14443AB & ISO15693 & ISO18000 & ISO7816 IC Card Module www.quio-rfid.de

important to get a stable communication and faster speed. The host's SDA pin should connect to the

device's SDA pin; meanwhile the host's SCL pin should connect to the device's SCL pin.

I²C bus is able to connect with 128 devices. The I²C address of module is default 0xA0. Users

may change the address setting via sending the command (0x19), so that user could connect multi

modules on the same I²C bus.

4.2.2 Data Links

The following is I²C communication link. It shows JCP04 protocol data format.

4.2.2.1 Clock and Data Transaction

The SDA pin is normally pulled high with an external device. Data on the SDA pin may

change only during SCL low time periods. Data changes during SCL high periods will indicate a

start or stop condition as defined below.

4.2.2.2 Start Condition

A high-to-low transition of SDA with SCL high is a start condition, which must precede any

other command.

4.2.2.3 Stop Condition

A low-to-high transition of SDA with SCL high is a stop condition.

4.2.2.4 Acknowledge (ACK)

All addresses and data words are serially transmitted to and from the module in 8-bit words.

The module sends a zero to acknowledge that it is not busy and has received each word. This