Advanced Card ACR100I Reference Manual - Page 8

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6.0. USB Interface

The connection of the ACR100I to a computer through a USB port follows a USB Standard.

6.1. Communication Parameters

The ACR100I is connected to a computer through USB as specified in the USB Specification 2.0. The
ACR100I is working in high-speed mode, i.e. 480 Mbps.
Pin
Signal
1
V
2
3
4
GND

6.2. Endpoints

The ACR100I uses the following endpoints to communicate with the host computer.
6.2.1.

Smart Card Reader

Control
Endpoint
Bulk OUT
Bulk IN
Interrupt IN
6.2.2.

Mass Storage

Control
Endpoint
Bulk OUT
Bulk IN
ACR100I – Reference Manual
Version 1.00
+5 V power supply for the reader (Max 500 mA, Normal 300 mA)
BUS
D-
Differential signal transmits data between ACR100I and computer.
D+
Differential signal transmits data between ACR100I and computer.
Reference voltage level for power supply
For setup and control purpose
For command to be sent from host to ACR100I (data packet size is 64
bytes).
For response to be sent from ACR100I to host (data packet size is 64
bytes).
For card status message to be sent from ACR100I to host (data packet
size is 8 bytes).
For setup and control purpose
For command to be sent from host to Device (data packet size is 512
bytes)
For response to be sent from Device to host (data packet size is 512
bytes)
Function
Page 8 of 20
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