Alereon AL5721 Руководство пользователя - Страница 4

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36
USB D-
37
C2D
38
USB D+
39
C2CLK
40
GND
41
AL_GPIO_2
42
Dock_LED
43
AL_GPIO_4
44
Security_LED#
45
AL_GPIO_5
46
Data_LED#
47
AL_GPIO_7
48
NC
49
Host_Connect_LED
50
GND
51
NC
52
3.3V

4.0 DESIGN CONSIDERATIONS

4.1 Power
One +3.3 V power supply at max data rate average current of 500 mA with peak at 750
mA. Connector pins #2 and 52 (+3.3V) are connected in common, both should connect
to the host system power rail. Connector pins #4, 9, 15, 18, 21, 26, 27, 29, 34, 35, 40,
and 50 are connected in common, all should connect to the host system ground.
4.2 LED Indicator Functions
Name
Functional Description
Steady flashing when dock power is applied and radio is beaconing but not connected to a host.
LED is solid when a wireless connection is made to a Host PC.
Dock LED
Normally off, Flashes during cable association process, Goes solid when a successful cable
association is made.
During wireless operation, this LED is off when there is not wireless connection to a host,
when successful Secure wireless connection is made to a pre-associated host, the LED goes solid.
Security LED
Flashes when data is being passed wireless in either direction.
Data LED
Normally off. The LED goes solid when a wireless connection is made with the host.
This "Host Connect" LED indicates that the dock is successfully connected to the host.
Host Connect LED
UG-AL5721_1.0
I/O
USB D- data signal from host system
I/O
Test signal for 8051CF326 USB controller
I/O
USB D+ data signal from host system
I/O
Test signal for 8051CF326 USB controller
Ground connection
I/O
MAC GPIO signal, functionality may be determined
by customer definition
O
LED drive pin, functionality per table 2
I/O
MAC GPIO signal, functionality may be determined
by customer definition
O
LED drive pin, functionality per table 2
I/O
MAC GPIO signal, functionality may be determined
by customer definition
O
LED drive pin, functionality per table 2
I/O
MAC GPIO signal, functionality may be determined
by customer definition
No Connection
O
LED drive pin, functionality per table 2
Ground connection
No Connection
+3.3V Regulated power from host system
Table 1. Pin Descriptions
Table 2. LED Indicator Functionality
P.4/7