MEIG SLM500, Hardware Design Manual

Page: 13 / 78

MeiG Smart product technical information
SLM500
Hardware Design Guide
Page 13
3.2. Pin definitions
table 3.1
：
Pin description
Pin number Pin number
I/O
Description Comment
The power supply
VBAT
1
、
2
、
145
、
146
I
The module provides Four
VBAT power pin pins. The
SLM500 operates from a single
supply with a voltage range
from 3.4V to 4.2V for VBAT. Externally,
large capacito-
rs and Zener
diodes must be
added for
surge protec-
tion.
VBUS
141
、
142
I/O 5V charging input power.
VCOIN
126
I/O
When the VBAT of the system
power is absent, the external
backup battery provides power
to the system real-time clock.
When VBAT is present, the
backup battery is charged.
VCOIN pins
connect 3V
button batteries
or large
capacitors.
VREG_L5_1P8 111 O
1.8V power output, Power
supply always available for IO
port pull-up and level conver-
sion, not for peripheral power
supply 50mA
VREG_L6_1P8
125
O
1.8 V power output, standby will
be closed, used for Camera,
LCD and other small current
power supply.
100mA
VREG_L10_2P8
156
O
2.8V power output, used for
Sensor, TP power supply.
150mA
VREG_L17_2P85
129
O
2.85 V power output, for LCD,
Camera 2.8V.
300mA
VREG_L11
_SDC
38 O TF card power supply pin 500mA
VREG_L12_
SDC
32 O
TF card signal pull-up power
supply pin
50
mA
VREG_L14_UIM1
26
O
UIM power supply pins
50mA
VREG_L15_UIM2
21
O
UIM power supply pins
50mA
VREG_L16_AVDD 193 O
Camera AVDD
50mA
GND
3
、
7
、
12
、
15
、
27
、
51
、
62
、
69
、
76
、
78
、
85
、
86
、
88
、
89
、
120
、
122
、
130
、
132
、
135
、
140
、
143
、
144
、
149
、
162
、
171
、
172
、
176
、
187~191
、
202~204
206~224
、
226~231
233~238
、
240
、
241
、
243
、
244
、
245
、
247
、
248
、
GND