Pin Description - SimCom SIM808 Hardware Design

3.2

Pin Description

Table 5: Pin description
Pin name Pin number
Power supply
VBAT 4,5,6
VRTC 17
VDD_EXT 7
1,2,3,18,28,34
GND ,36,40,51,52,5
4,64,65,67,68
Power on/off
PWRKEY 8
Audio interface
MIC1P 19
MIC1N 20
SPK1P 21
SPK1N 22
PCM interface
PCM_OUT 48
PCM_IN 47
PCM_SYNC 45
PCM_CLK 46
Keypad interface
COL3 59
COL2 60
COL1 61
COL0 62
ROW3 55
ROW2 56
ROW1 57
ROW0 58
SIM808_Hardware Design_V1.00
I/O Description
SIM808 supplies 3 VBAT pins, and the power
range is from 3.4V to 4.4V. Power supply
I should provide sufficient current so that the
module can work normally; the peak current is
nearly 2A.
I/O Power supply for RTC
O 2.8V power output
Ground
PWRKEY should be pulled low at least 1
I second and then released to power on/down the
module.
I Differential audio input
O Differential audio output
O
I
PCM interface for audio
O
I
I
I
I
I
Support up to 32 buttons (4*4*2)
O
O
O
O
16
Smart Machine Smart Decision
Comment
Zener diode
Strongly
recommended to anti
surge on VBAT.
It is recommended to
connect VRTC to a
battery or a capacitor
(e.g. 4.7uF).
Keep floating
unused.
Recommend
connecting
to the power GND.
Internally pulled up to
VBAT.
Keep floating
unused.
Keep floating
unused.
Keep floating
unused. (COL0 can
not be pulled down).
2014.03.27
is
if
1,2,3pin
if
if
if