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3
Operating Characteristics
3.1. Power Supply
3.1.1. Power Supply Interface
The module provides 8 VBAT pins dedicate to connecting with the external power supply. The power
supply range of the module is 3.3–3.5 V, and the recommended value is 3.4 V.
Table 7: VBAT and GND Pins
Pin Name
Pin No.
147, 148, 151, 152, 153, 156, 157, 161
VBAT
GND
142, 143, 144, 146, 149, 154, 158, 162, 166
3.1.2. Reference Design for Power Supply
Power design for the module is essential. The power supply of the module should be able to provide
sufficient current of 3
A*
small, it is suggested to use an LDO; if the voltage difference is big, a buck converter is recommended.
The following figure shows a reference design for LDO power supply:
DC_IN
C1
470 μF
SG368Z_Series_Hardware_Design
at least. If the voltage difference between input voltage and the supply voltage is
2
IN
R1
C2
51K
100 nF
Figure 2: Reference Design of Power Input
I/O
Description
Power supply
PI
for the module
Ground
U1
4
OUT
R2
220K
1 %
R4
470R
R3
100K
1 %
Smart Module Series
Comment
VBAT
C3
C4
100 nF
470 μF
34 / 113
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