Redpine Signals Inc. Proprietary and Confidential
Page 11
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Circuit and Layout Guidelines
The following are guidelines for integrating the RS9110-N-11-02 module into a wireless LAN solution.
1.
The WLAN module has a central ground pad of size 2.5mm x 2.5mm. An application’s layout must have a provision to
include this.
a.
Please provide a 2.7 mm X 2.7 mm Copper pad on the Top side of the application board. Please open the solder
mask in this area so that the Cu is exposed.
b.
Please provide a 2.7 mm X 2.7 mm or higher Copper pad on the bottom side of the application board. Please
open the solder mask in this area so that the Cu is exposed.
c.
Please provide at least 12 via’s to connect these pads to the Ground plane. We recommend that the via’s should
be at least 10 mil x 18 mil.
2.
For RESET one of the two options should be followed
a.
The RESET can be Host driven. At the time of Power-on, Please ensure that the reset is held low for at least
20mSec. After this the reset should be driven high.
b.
Reset may be driven by an R-C circuit. The recommended value of ‘R’ is 100 Kohms and the recommended
value of ‘C’ is 0.1uF.
3.
The reference schematics shown in the previous section include the recommended power supply filtering and
decoupling.
4.
The RF trace on RF_OUT should have a characteristic impedance of 50 ohms. They can use any standard 50 RF trace
(Micro strip or Coplanar wave guide). The width of the 50 ohm line depends on their PCB stack like the Dielectric of the
PCB, thickness of Copper , thickness of Dielectric and such other factors. The customer is advised to work with their
fabrication unit to chose the right PCB stack and width.
5.
To evaluate transmit and receive performance like Tx Power and EVM, Rx sensitivity etc., a ‘microwave coaxial
connector with switch’ should be placed between RF_OUT and the antenna.
6.
CLK_REF is the reference clock to the module and should therefore be routed with minimum trace length and should be
routed away from other switching or sensitive traces.
7.
Unused pins may be left open
