SIM Tech SimCom SIM340 Hardware Design page 20

SIM340 Hardware Design
A A
DISP_CLK O/4mA
DISP_CS O/4mA
DISP_D/C O/4mA
DISP_RST O/4mA
NETLIGHT O/4mA
GPIO0 I/O/4m
A
Serial port
PIN NAME I/O
DTR I/8mA
RXD I/8mA
TXD O/8mA
RTS I/8mA
CTS O/8mA
RI O/8mA
DCD O/4mA
Debug port
DBG_TXD O/4mA
DBG_RXD I/4mA
SIM interface
PIN NAME I/O
SIM_VDD O
SIM340_HD_V3.09
Network status indication
Normal input/output port
DESCRIPTION
Data terminal ready
Receive data
Transmit data
Request to send
Clear to send
Ring indicator
Data carrier detection
Serial interface for debugging only
DESCRIPTION
Voltage supply for SIM card
20
DC CHARACTERISTICS
VILmin=0V
VILmax=0.3*VDD_EXT
VIHmin=0.7*VDD_EXT
VIHmax= VDD_EXT+0.3
VOLmin=GND
VOLmax=0.2V
VOHmin= VDD_EXT-0.2
VOHmax= VDD_EXT
DC CHARACTERISTICS
The voltage can be select All signals of
18.03.2009
keep pins
open
If unused
keep pins
open
If use only
TXD,RXD
GND three
pins to
communicate,
RTS pin
connect to
GND directly.
DTR pin is
pull up to
VEXT with
100K
If unused
keep pins
open
If unused
keep pins
open