SIM900A 데이터 시트보기 (PDF) - Unspecified
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SIM900A Datasheet PDF : 58 Pages
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SIM900 Hardware Design
SDA
I/O I2C bus data
open
KBR0~KBR4 O
KBC0~KBC4 I Keypad interface
If unused keep
these pins open
Pull up to
VDD_EXT, if
unused keep
pins open
Serial port
PIN NAME I/O DESCRIPTION
DC CHARACTERISTICS
COMMENT
RXD
TXD
RTS
CTS
RI
DSR
DCD
DTR
I Receive data
O Transmit data
I Request to send
O Clear to send
O Ring indicator
O Data Set Ready
O Data carry detect
I Data terminal Ready
VILmax=0.15 *VDD_EXT
VIHmin=0.85*VDD_EXT
VILmin= 0V
VIHmax= VDD_EXT
VOHmin= VDD_EXT-0.1V
VOLmax=0.1V
VOHmax= VDD_EXT
VOLmin= 0V
DTR Pin has
been pulled
up
to
VDD_EXT. If
unused keep
pin open
Debug interface
PIN NAME I/O DESCRIPTION
DC CHARACTERISTICS
COMMENT
DBG_TXD
DBG_RXD
O Serial interface for VILmax=0.15 *VDD_EXT
debugging and firmware VIHmin=0.85*VDD_EXT
upgrade
VILmin= 0V
VIHmax= VDD_EXT
I
VOHmin= VDD_EXT-0.1V
VOLmax=0.1V
VOHmax= VDD_EXT
VOLmin= 0V
If unused keep
pins open
SIM interface
PIN NAME I/O DESCRIPTION
DC CHARACTERISTICS
COMMENT
SIM_VDD
O Voltage supply for SIM card The voltage can be select by software
automatically either 1.8V or 3V
SIM_DATA
SIM_CLK
SIM_RST
I/O SIM data output
O SIM clock
O SIM reset
VILmax=0.15 *SIM_VDD
VIHmin=0.85*SIM_VDD
VILmin= 0V
VIHmax= SIM_VDD
VOHmin= SIM_VDD-0.1V
VOLmax=0.1V
VOHmax= SIM_VDD
VOLmin= 0V
All signals of
SIM interface
are protected
against ESD
with a TVS
diode array.
Maximum cable
length 200mm
from the module
pad to SIM card
SIM900_HD_V1.01
19
26.12.2009
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