Sim800 hardware design v1.05

Smart Machine Smart Decision
SIM800_Hardware Design_V1.05 15 2014-03-25
3.2. Pin Description
Table 4: Pin description
Pin name Pin number I/O Description Comment
Power supply
VBAT 55,56,57 I
SIM800 supplies 3 VBAT pins, and the power
range is from 3.4V to 4.4V. Power supply
should provide sufficient current so that the
module can work normally; the peak current is
nearly 2A.
Zener diode is
Strongly
recommended to anti
surge on VBAT.
VRTC 26 I/O Power supply for RTC
It is recommended to
connect VRTC to a
battery or a capacitor
(e.g. 4.7uF).
VDD_EXT 15 O 2.8V power output
Keep floating if
unused.
GND
2,17,18,29,39,
45,46,54,58,5
9,61,62,63,64,
65
Ground
Recommend
connecting
62,63,64,65pin to the
power GND.
Power on/off
PWRKEY 1 I
PWRKEY should be pulled low at least 1
second and then released to power on/down the
module.
Internally pulled up to
VBAT.
Audio interface
MICP 19
MICN 20
I Differential audio input
SPKP 21
SPKN 22
O Differential audio output
Keep floating if
unused.
PCM interface
PCMOUT 6 O
PCMIN 12 I
PCMSYNC 14 O
PCMCLK 68 I
PCM interface for audio
Keep floating if
unused.
Keypad interface
COL4 47 I
COL3 48 I
COL2 49 I
COL1 50 I
COL0 51 I
ROW4 40 O
ROW3 41 O
Support up to 50 buttons (5*5*2) Keep floating if
unused. (COL0 can
not be pulled down).