Quectel SC20 User Manual

LTE Module Series
Smart EVB User Guide
Smart_EVB_User_Guide Confidential / Released 19 / 29
Table 6: Pin Assignment of USIM Card
Pin assignment of J504 is the same as that of J503.
3.5. UART Interfaces
Smart EVB offers two UART interfaces, which are main UART port (J901) and debug UART port (J604).
The UART interface J901 is intended for the communication between the module and the host application.
This interface can be used for data transmission and AT command communication. And the debug UART
interface is used for debugging.
The following figure and table show the UART block diagram on Smart EVB and pin assignment of J901.
J101
Module
RS 232
Level Match
3.3V/1.8V
Level Translator
UART
DB9
J901
RS232 3.3V
1.8V
U902
U901
Figure 14: UART Block Diagram
No.
Pin Name
I/O
Function
C1
USIM_VDD
O
USIM/SIM card power
C2
USIM_RST
O
USIM/SIM card reset
C3
USIM_CLK
O
USIM/SIM card clock
C5
GND
Ground
C6
VPP
Not connected
C7
USIM_DATA
I/O
Data line, bi-directional
CD1
GND
GND
USIM card detection
CD2
USIM_PRESENCE
I
USIM card detection
NOTE
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Quectel SC20 Specifications

General

Brand	Quectel
Model	SC20
Category	Control Unit
Language	English