AT83EC5123 ATMEL Corporation, AT83EC5123 Datasheet - Page 75

• Manufacturer Part Number: AT83EC5123
• Description: (AT8xx512x) Smart Card Reader ICs
• Manufacturer: ATMEL Corporation

Detach Simulation
Figure 43. Disconnect Timing
4202B–SCR–07/03
V
IHZ(min)
V
V
IL
SS
D+
D-
Disconnected
In order to be re-enumerated by the Host, the AT8xC5122/23 has the possibility to sim-
ulate a DETACH-ATTACH of the USB bus.
The V
D+ pull-up as shown in Figure 42. This output can be put in high-impedance when the
DETACH bit is set to 1 in the USBCON register. Maintaining this output in high imped-
ance for more than 3 µs will simulate the disconnection of the device. When resetting
the DETACH bit, an ATTACH is then simulated. The USB controller should be enabled
to use this feature.
Figure 42. Example of V
Device
REF
output voltage is between 3.0V and 3.6V. This output can be connected to the
>= 2,5 s
REF
Connection
V
REF
D-
D+
Disconnect
Detected
1.5 k
AT8xC5122/23
1
2
3
4
USB-B Connector
VCC
D-
D+
GND
75