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Parameter Dimension
Specification Details
Product Model
A066
Product Weight
Cased weight: 18g — Bare PCB weight: 9g
Core Chip
RC522 RFID Radio Frequency Card Module / NFC Module (A066)
PCB Dimension
40.00mm × 43.00mm
Mounting Hole Spacing
27.00mm × 29.00mm
Interface Type
1 × 6Pin XH2.54 Connector
Communication Mode
Dual-mode I2C / UART supported (configurable and switched via onboard resistors)
Silk Screen Marking
RC522-I2C/UART, BIT-TREE CREATIVITY
Other Components
Built-in LDO voltage regulator circuit, 1 × onboard antenna
6Pin Interface Pinout Definition - Pin 1
GND: Power ground, must share common ground with the main controller
VCC: Module power supply positive pin (typical 3.3V, 5V input prohibited)
SDA/RXD: SDA data line under I2C mode; RXD receiver under UART mode
SCL/TXD: SCL clock line under I2C mode; TXD transmitter under UART mode
IRQ: Interrupt signal output pin, triggers interrupt upon successful card reading
RST: Module reset pin, active low reset, high level for normal operation
RC522 Chip Core Feature - Operating Frequency
13.56MHz
Supported Card Types
MIFARE Classic 1K/4K, MIFARE Ultralight, etc.
Read & Write Distance
Typical 3-5cm (varies with antenna and card type)
Operating Voltage
2.5V~3.3V (LDO voltage regulator integrated on the module)
Optional Packaging Solutions
① Anti-static bag soft packaging ② White cardboard hanging box ③ Kraft paper box
