EasyManuals Logo

SimCom SIM900 Hardware Design

SimCom SIM900
59 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #18 background imageLoading...
Page #18 background image
SIM900 Hardware Design
VDD_EXT O 2.8V output power supply Vmax=2.95V
Vmin=2.70V
Vnorm=2.80V
Iout(max)= 10mA
If unused, keep
open.
GND Ground
Power on or power off
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
PWRKEY I Voltage input for PWRKEY.
PWRKEY should be pulled
low to power on or power off
the system. The user should
drive the PWRKEY to low
level voltage for a short time
when power on or power off
the system because the
system need margin time in
order to assert the software.
VILmax=0.15*VDD_EXT
VIHmin=0.85* VDD_EXT
VImax=VDD_EXT
VILmin= 0V
It is already
pulled up.
PWRKEY_O
UT
O Connecting PWRKEY and
PWRKEY_OUT for a short
time then release also can
power on or power off the
module.
VOHmin= VDD_EXT-0.1V
VOLmax=0.1V
VOHmax= VDD_EXT
VOLmin= 0V
Audio interfaces
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT
MIC_P
MIC_N
I Positive and negative voice
band input
Audio DC Characteristics refer to
chapter 3.9
If unused keep
open
SPK_P
SPK_N
O Positive and negative voice
band output
If unused keep
open
LINEIN_R
LINEIN_L
I Line input If unused keep
open
GERNERAL PURPOSE input/output
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT
STATUS O Indicate working status If unused keep
open
NETLIGHT O Indicate net status If unused keep
open
DISP_DATA I/O
DISP _CLK O
DISP _CS O
DISP _D/C O
Display interface
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
If unused keep
open
SIM900_HD_V1.05 06.23.2010
18

Table of Contents

Other manuals for SimCom SIM900

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the SimCom SIM900 and is the answer not in the manual?

SimCom SIM900 Specifications

General IconGeneral
BrandSimCom
ModelSIM900
CategoryModem
LanguageEnglish