User's Manual

Technical Data
DC Electrical Characteristics
Symbol Parameter Condition Min Typ Max Units
Vdd Supply Voltage 4.75 5 5.5 VDC
Idd Supply current 150 250 mA
Idd1 Peak Supply current Inrush 450 mA
Vih Input high voltage 3.3 Vdd+0.3 V
Vil Input low voltage -0.3 0.8 V
Ii Input leakage
current
300 uA
Additional requirements for the supply voltage: Vripple = 50mVpp max.
RF Characteristics
 Operating frequency: 13.56 MHz
 Data transmission modulation reader to card: ASK
 Data transmission modulation card to reader: ASK/load modulation
Pinout 4-Pin USB plug and Signal Descriptions
Pin Name Type Description
1 V_BUS Power USB-Power Supply
2 D- I/O USB Data inverted
3 D+ I/O USB Data
4 GND Power Ground
2