NXP Semiconductors
JN-RM-2079
QN9090 module development reference manual
JN-RM-2079
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© NXP Semiconductors N.V. 2020. All rights reserved.
Reference manual
Rev. 1.0
— 17 Jan 2020
16 of 31
Fig 12. VDDE decoupling
Fig 13. VBAT decoupling
4.11 Traces Isolation
When PCB traces are in close proximity, they can talk to each other through the
capacitor created by these traces.
In order to minimize the effect of this parasitic coupling, identify the most sensitive traces
or areas (RF trace, oscillator, power lines, ...) and separate them from any signal that is
likely to couple with them through parasitics.
Separation between 2 lines can be achieved by increasing the distance from one to the
other.
4.12 GPIOs
The GPIOs traces are generally long lines that can cover long distances. They can
carry undesirable signals that are likely to radiate in any direction. It is recommended to
avoid routing these signals
C100
V
D
D
E
C
1
0
C
1
2
C
1
