Smart Machine Smart Decision
SIM800H _Hardware Design_V2.03
16
2016-10-10
3.2.
Pin Description
Table 5: Pin description
Pin name
Pin number
I/O Description
Comment
Power supply
VBAT
1,42
I
Power supply
VRTC
56
I/O Power supply for RTC
It is recommended to
connect with a battery or a
capacitor (e.g. 4.7uF).
VDD_EXT
18
O
2.8V power output
If these pins are unused,
keep open.
GND
2,6,8,35,37,38,39,
41,43,44,45,58,67
,71,72,73,76,77,7
8,79,80,81,82,83,
84,85,86,87,88
Ground
GND for VBAT recommend
to use 2,43,44,45pin
Power on/down
PWRKEY
48
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 interfaces
MIC1P
52
I
Differential audio input
If these pins are unused,
keep open.
MIC1N
12
SPK1P
53
O
Differential audio output
SPK1N
13
MIC2P
9
I
Differential audio input
MIC2N
10
SPK2P
51
O
Differential audio output
SPK2N
11
PCM interface
PCM_CLK
29
O
PCM interface for digital audio
If these pins are unused,
keep open.
PCM_OUT
30
O
PCM_SYNC 65
O
PCM_IN
66
I
Keypads interface
KBC4
24
I
Support up to 50 buttons (5*5*2)
If these pins are unused,
keep open.
（
Please make
sure pin20 at high level
when power on
）
KBC3
21
I
KBC2
22
I
KBC1
25
I
KBC0
20
I
KBR4
63
O
KBR3
23
O
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