Pcb Layout; Pin Assignment; Principle Of Pcb Layout - SIM Tech SIMCom SIM800C Hardware Design

5. PCB Layout

This section will give some guidelines on PCB layout, in order to eliminate interfere or noise.
5.1

Pin Assignment

Before PCB layout, we should learn 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.
NETLIG
STATUS VDD_EXT
HT
41
42
UART1_TX
1
D
2
UART1_RXD
UART1_RTS 3
UART1_CT
4
S
UART1_DC
5
D
UART1_DT
6
UART1_DTR
R
7
UART1_RI
GND 8
MICP 9
MICN
10
11
SPKP
SPKN 12
13 14
SIM_DAT
SIM_DE
GND
T
5.2

Principle of PCB Layout

During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card
interface, audio interface, and so on.
SIM800C_Hardware_Design_V1.00
PWRKE
ADC
Y
40 39 38
SIM800C
TOP VIEW
16 17
15
SIM_CL SIM_RS
A K T
Figure 39: Pin assignment
GND GND VBAT
37 36 35
18 19 20
SIM_VD
GND BT_ANT
D
41
Smart Machine Smart Decision
VBAT
34
33 GND
GSM_AN
32
T
VBAT
31 GND
UART
30 GND
AUDIO
29 RF_SYNC
28 VRTC
SIM CART
GND
27
USB
USB_D
26
M
ANTANA
25 USB_DP
GND
USB_VBU
24
S
OTHERS
23 UART2_RXD
22 UART2_TXD
21
GND
2014-10-30