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RF Layout, Soldering Guidelines
RF Layout & Design Guidelines
I.
Do not run antenna cables directly above or directly below the radio.
II.
Do not run any high speed digital lines below the radio.
III.
For applications using only 1X1, the second antenna port i.e RF_ANT1
to be terminated with a 50 ohm resistor close to the pin of SOMAT39.
IV.
Isolate VDD2 & VDD3 (pin no 36 & 37) with a ferrite bead
(BLM15AG100SN1D) and decaps of 22uF and 0.1uF to be placed very
close to the pins.
V.
10uF and 0.1uF to be used at VDD1 i.e pin no 23 and the input power
supply which are to be placed very close to the pins.
VI.
A 100K pull down resistors to be used for BT_DEV_WAKE, WL_EN
and BT_EN close to the pins of RF SOM.
VII.
A series R (10E) and shunt capacitor (22pf) is recommended to reduce the
SDIO clock noise going to the input of SOMAT39 pin (pin no 43).
VIII.
Use proper electro-static-discharge (ESD) procedures when installing the
SOMAT39 module.
Chapter
5