When designing the Printed Circuit Board (PCB) layout, pin-specific recommendations
should be followed.
The ENABLE pin has the following recommendations:
- Place R1 close to the ENABLE pin.
- If ENABLE is directly connected to VDD1, it can use a
shared decoupling capacitor with VDD1 if VDD1's decoupling
capacitors and ENABLE are located close to each other.
- If ENABLE is not directly connected to VDD1, a
dedicated decoupling capacitor is recommended to be added to the ENABLE
pin.
- Because ENABLE can carry noise from internal and external regulators and
the power source, it is not recommended to be routed parallel to sensitive routings, such as RF.
- Avoid routing the Enable signal unshielded on the top and bottom metal layers of the PCB.
This risks radiated noise that can deteriorate radiated Global Positioning System (GPS) and LTE
sensitivity.