SimCom SIM7022-EVB - UART Interface

SIM7022-EVB User Guide V1.00
www.simcom.com
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Table 6: (U)SIM card interface pin definition (J102)
Pin number
Pin name
I/O
Describe
1
VCC
O
(U)SIM power supply
2
RST
O
(U)SIM reset signal
3
CLK
O
(U)SIM clock signal
4
DET
I
(U)SIM detect signal
5
GND
GND
6
VPP
Float
7
I/O
I/O
(U)SIM duplex data line
2.3 UART Interface
SIM7022 EVB provides two UART interfaces (J103, J104) by USB to UART. J103 is used as the main serial
port for AT commands, data transmission and firmware upgrade, and J104 is used as DEBUG debugging
serial port for software DEBUG debugging.
The reference circuit of USB to UART interface is shown in the figure
below.