USR IOT USR-C321, Руководство пользователя

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USR-C321
Low Power Minisize WiFi Module User Manual
www.usr.so
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placed components and GND.
� Antennas away from the metal, at least distance with high components around
more than 10 mm;
� Antenna part cannot be metal shell, plastic shell need at least more than 10 mm
away from the antenna;
It is suggested that module is placed in the following areas of the user's board as far
as possible, to reduce the influence of the antenna and wireless signal, and at the same
time, please consult someone technical support staff to assist the placement of
modules and related areas of the Layout design.
2) external antenna
Customers to use external antenna lead, according to the requirement of the
IEEE802.11 b/g/n standard, need to connect the 2.4 g external antenna. External antenna
using IPEX interface. The parameters of the external antenna requirements in the table
below details.
item paramter
frequency range 2.4~2.5GHz
impedance 50 Ohm
VSWR 2 (Max)
Return Loss -10dB (Max)
Connection Type IPEX
2.4 2.4 2.4 2.4 The The The The Hardware Hardware Hardware Hardware Circuit Circuit Circuit Circuit Design Design Design Design Reference Reference Reference Reference
The hardware design considerations:
�
Need to add more than 200uf capacitance module power supply pin.
� SOP0
、
SOP1
、
no connect.
�
SOP2 reserved a port,used to upgrade firmware in uart0
�
Reset
、
Reload need to pick up on the 4.7 K resistor.
� nLink,nReady Effective for low level output.
�
Serial port RXD, TXD series a 0
Ω
resistance
�
Serial port RXD, TXD need to pick up on the 10K resistor.