Pin Description - SimCom SIM800 Hardware Design

3.2. Pin Description

Table 4: Pin description
Pin
Pin name
number
Power supply
VBAT 55,56,57
VRTC 26
VDD_EXT 15
2,17,18,29,3
9,45,46,54,5
GND
8,59,61,62,6
3,64,65
Power on/off
PWRKEY 1
Audio interface
MICP 19
MICN 20
SPKP 21
SPKN 22
PCM interface
PCM_OUT 6
PCM_IN 12
PCM_SYNC 14
PCM_CLK 68
Keypad interface
KBC4 47
KBC3 48
KBC2 49
KBC1 50
KBC0 51
KBR4 40
SIM800_Hardware Design_V1.10
I/O Description
SIM800 supplies 3 VBAT pins, and
the power range is from 3.4V to 4.4V.
Power supply
I
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
I least 1.2 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
Support up to 50 buttons (5*5*2)
I
I
O
15
Smart Machine Smart Decision
Comment
Zener diode is Strongly
should provide
recommended to anti surge
on VBAT.
It is
connect VRTC to a battery
or a capacitor (e.g. 4.7uF).
Keep floating if unused.
GND for VBAT
recommend to use 62, 63,
64, 65 pin
.
Internally pulled up to
VBAT.
Keep floating if unused.
Keep floating if unused.
Keep floating if unused.
(KBC0 can not be pulled
down).
recommended to
2018-08-13