Reference Manual ACR122T Advanced Card Systems Ltd. Website: www.acs.com.hk Email: info@acs.com.
Revision History Version Date Prepared By V1.00 31.Mar.2009 Kit AU Version <1.
Table of Contents 1.0. Introduction ................................................................................................................. 4 2.0. Feature ......................................................................................................................... 5 3.0. Hardware Interfaces ................................................................................................... 6 3.1. USB Interface ...........................................................
1.0. Introduction The ACR122T is a PC-linked Contactless cards Reader and writer for accessing ISO14443 Part 4 Type A contactless card. Version <1.
2.0. Feature • USB Interface • HID Standard • No Driver Requested • Build-in Antenna for contactless tags access. • Support ISO14443 Part 4 Type A • 13.56MHz Carrier Frequency Band • Bi-Color LED. • RoHS • Small in size Version <1.
3.0. Hardware Interfaces 3.1. USB Interface The ACR122T is connected to a Host through the USB as specified in the USB Specification 1.1. The ACR122T is working in Full speed mode, i.e. 12Mbps. Pin Signal Function 1 VCC +5V power supply for the reader (Max 200mA, Normal 100mA) 2 D- Differential signal transmits data between Host and ACR122T 3 D+ Differential signal transmits data between Host and ACR122T 4 GND Reference voltage level for power supply 3.2.
4.0. Chips Selection The AC1038 (ST7SCR) will be used as the main core for the reader. The reasons are listed below: 1. The AC1038 (ST7SCR) has been used in our current readers for a long time. This chip is considered stable and mature 2. Little change on the existing USB and Contactless Cards access portions of the ACR122U firmware can be used. 3. The AC1038 (ST7SCR) supports USB Interface 4. The AC1038 (ST7SCR) provides sufficient I/O pins for driving the RF Interface chip 5.
5.0. Implemenation 5.1. The ACR122T is built based on the AC1038 and PN5321 chips. Built-In Antenna PN5321 AC1038 NFC Interface Chip Host Controller Host Controller Serial Interface Contactless Interface 115200 Kbps Carrier = 13.56MHz USB Interface 12Mbps Contactless Tag - Bi-Color LED - Buzzer (optional) - I/O Ports Figure 1.ACR122T System Block Diagram Version <1.
5.2. Communication between the Host and the Contactless interface and Peripherals. The Contactless interface & Peripherals are accessed through the use of HID Command Pattern. Host USB Interface (HID protocol) NON-PCSC Layer ACR122T 1) Peripherals 2) Bi-Color LED Contactless Interface RF Interface Contactless Tag (Built-In Antenna) Version <1.
6.0. Software Interface Non PCSC interface is used for exchanging APDUs and Responses between the Host and Tag. The ACR122T is only used as transceiver. The ADPUs and Responses are transparent to the ACR122T. ACR122T will come with the following commands for this purpose. 1. Card Polling To request response from contactless card within the antenna access area, the serial number of the contactless card will be returned 2.
