ACR122U User Manual
Version 1.01
www.acs.com.hk
Page 5 of 13
3.0. Architecture
GD32 is for main processor for communication with PC, and control the contactless chip and
peripherals. PN532 acts as a contactless chip to perform the communication between contactless
tags and GD32.
For communication architecture, the protocol between ACR122U and PC is using CCID protocol. All
the communication between PICC is PCSC Compliant.
ACR122U
Antenna
GD32 Host
Controller
LEDs
PN532
NFC
Interface
chip
PC
Operation
System
PICC
Contactless
Tag
Contactless Interface
Carrier Frequency = 13.56MHz
