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