SimCom SIM802 HD Manual page 20

SIM802 Hardware Design
VCHG I
GND ground
Power on or power off
Pin name I/O
PWRKEY I
Audio interfaces
Pin name I/O
MIC1P I
MIC1N
MIC2P I
MIC2N
SPK1P O
SPK1N
SPK2P O
SPK2N
AGND
General purpose input/output
SIM802_HD_V2.01
the system.
Current output for backup
battery when the main
battery is present and the
backup battery is in low
voltage state.
Voltage input for the charge
circuit, as the signal for
detecting the charger
connecting
Digital ground
Description
Press the key , the PWRKEY
get a low level voltage for
user to power on or power
off the system, the user
should keep pressing the key
for a moment when power on
or power off the system.
Because the system need
margin time assert
software.
Description
Positive and negative voice
band input
Auxiliary positive and
negative voice band input
Positive and negative voice
band output
Auxiliary positive and
negative voice band output
Analog ground
20
Vnorm=1.8V
I = 20uA
out(max)
I =5 uA
in
Vmax=5.25V
Vmin=1.1* VBAT
Vnorm=5.1V
Imax=650mA
DC characteristics
VILmax=0.2*VBAT
VIHmin=0.6*VBAT
VImax=VBAT
the
DC characteristics
Characteristics refer
to chapter 3.10
connected to a
battery or a
capacitor.
If unused keep pin
open
Comment
Pull up to VBAT
inside.
Comment
If unused keep
pins open
Separate ground
connection for
external audio
circuits.
If unused, it
should be
connected to GND
12.01.2010