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1.2. USB Interface
The ACR122U is connected to a computer through USB as specified in the USB Specification 1.1.
The ACR122U is working in full-speed mode, i.e. 12 Mbps.

Pin

Signal

Function

1

VBUS

2

D-

Differential signal transmits data between ACR122U and PC

3

D+

Differential signal transmits data between ACR122U and PC

4

GND

+5 V power supply for the reader (Max. 200 mA, Normal 100 mA)

Reference voltage level for power supply
Table 1: USB Interface

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ACR122U – Application Programming Interface

Version 2.02

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