Pcb Layout; Pin Assignment; Principle Of Pcb Layout - SimCom SIM800L Hardware Design

5. PCB Layout

Usually, most electronic products with good performance are based on good PCB layout. A bad PCB layout will
lead to lots of issues, like TDD noise, SIM card not be detected, etc. the final solution for these problems is to
redo PCB layout. Making good PCB layout at beginning will save develop schedule and cost as well.
This section will give some guidelines on PCB layout, in order to eliminate interfere or noise by greatest degree,
and save product development period.
5.1

Pin Assignment

Before PCB layout, we should learn well about pin assignment in order to get reasonable layout with so many
external components. Following figure is the overview of pin assignment of the module.
Antenna
GND
VBAT
GND
GND GND
GND
GND
VBUS
GND
Audio
5.2

Principle of PCB Layout

During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card
SIM800L(MT6261)_Hardware Design_V1.01
GSM
I2C
GND GND GND
GND
GND
GND GND
GND GND
USB_DP
GND GND
SIM
Figure 50: Pin assignment
UART
GND
GND GND
GND GND
GND GND
GND
GND
GND
FM USB
antenna
50
Smart Machine Smart Decision
PCM
GND
KEY
2016-07-07