RFid Click

RFid click features CR95HF 13.56 MHz contactless transceiver as well as trace antenna. The click is designed to run on a 3.3V power supply only. It communicates with the target MCU via mikroBUS™ UART (TX, RX), SPI (MISO, MOSI, SCK, CS) INT, RST, PWM and AN lines.

The click functions as an integrated transceiver for contactless applications. The board contains a dedicated internal frame controller and analog front end (AFE) for RF communications. It supports ISO/IEC 14443 type A and B, ISO/IEC 15693 and ISO/IEC 18092 protocols (tags) as well as the detection, reading and writing of NFC forum type 1, 2, 3 and 4 tags.

CR95HF integrated transceiver

The CR95HF has 2 operating modes: Wait for Event (WFE) and Active.

In Active mode, the CR95HF communicates actively with a tag or an external host. WFE mode includes four low consumption states: Power-up, Hibernate, Sleep and Tag Detector. The transceiver can switch from one mode to another.

The Hibernate state has the lowest power consumption out of the four states (1 µA typ. 5 µA max.).

SMD jumpers

Two SMD jumpers are provided on the board. In case you want to use UART interface, it is necessary to solder SMD jumpers in B position. Otherwise, if you want to use SPI interface, jumpers should be left in its default position (A). In that case interrupt pins (IN and OUT) are usable.

Key features

• CR95HF IC
  • Operating modes supported: Reader/Writer
  • RF communication @13.56 MHz
  • Supports NFC Forum Type 1, 2, 3 and 4 tags
• 3.3V power supply
• Interface: UART, SPI