SimCom SIM5300E Hardware Design page 19

GPIO11 67
GPIO12 68
Serial port
RXD 10
TXD 9
RTS 8
CTS 7
DCD 5
RI 4
DTR 3
Debug port
GPIO8/DBG_RX
49
D
GPIO9/DBG_TX
50
D
USB interface
VBUS 24
USB_DP 27
USB_DN 28
USIM interface
USIM_VDD 30
USIM_DATA 31
USIM_CLK 32
SIM5300E_Hardware_Design_V1.02
GPIO11
GPIO12
DI Receive data
DO Transmit data
DI Request to send
DO Clear to send
DO Data carrier detect
DO Ring indicator
DI Data terminal ready
DI Default DBG_RXD
DO Default DBG_TXD
PI VBUS (5V)
IO
USB 2.0 specification, 90 Ohms
differential
IO
Voltage supply for USIM card. Support
PO
1.8V or 3V USIM card
IO USIM data input/output
DO USIM clock
TXD must be
prevented from
accessing excessive
voltage above 2V.
If these pins are
unused, keep
floating.
If these pins are
unused, keep
floating.
If these pins are
unused, keep
floating.
All signals of USIM
interface should be
protected against
ESD with a TVS
diode array.
11