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System Overview and Functional Descriptions
•
A green power-on LED (D5) is provided
3.4
Low-cost 2.4 GHz ISM Band radio
The MC1322x provides an onboard balun, antenna switch, and LNA. The only external component
required for the radio is an antenna. The USB dongle uses a PCB-mounted chip antenna.
the RF network external to the MC1322x.
•
Typical nominal output power is 0 dBm, with +4 dBm max
•
Typical sensitivity is -95 dBm.
•
Frequency range is 2405 to 2480 MHz
•
Typical range (outdoors, line of sight) is 300 meters
RF_RX_TX
RF_GND
3.5
USB Interface
Primary connection to the wireless node is the USB port that is provided via a USB "B" receptacle
designated as J2.
Figure 3-7
The port is connected to a FTDI FT232R USB <> UART device that appears as a Virtual COM port (VCP)
to the PC. PC drivers are available with the module. The USB interface is configured as a "Bus Powered"
device and draws all required power from the USB interface. The device is USB 2.0, full speed compatible.
3-4
L3
C4
3.9nH
1pF
Not Mounted
Not Mounted
Figure 3-6. 1322x USB Dongle RF Network
shows the connector pinout.
Figure 3-7. USB Connector Pinout
1322x-USB Reference Manual, Rev. 1.5
C5
Not Mounted
CHIP ANTENNA
10pF
ANT2
1
RF
2450AT43A100
Figure 3-6
shows
2
NC
Freescale Semiconductor
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