Advanced Card Systems Limited ACR122T Benutzerhandbuch
<ACR122T> <Feasibility Study>
Version <1.00>
Version <1.00>
<31/03/2009>
Page 6 of 10
<ACR122T>
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.
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. Bi-Color LED
•
User-controllable Bi-Color LED. Red and Green Color.
3.3. Built-in Antenna
•
6 turns symmetric loop antenna.
•
The estimated size = 19mm x 19mm.
•
The loop inductance should be around ~ 1.6uH to 2.5uH
•
Operating Distance for different Tags ~ up to 10mm (depend on the Tag)
•
No anti-collision. Only one Tag can be accessed at any one time.