Smart Module Series
SC262R_Series_Hardware_Design 37 / 115
Module
VBAT_RF
VBAT_BB
VBAT
C1
100
μF
C 6
100 nF
C7
33 pF
C8
10 pF
+
C3
100 nF
C4
33 pF
C5
10 pF
D1
C9
100
μF
+
C2
4.7
μF
GND
D2
Figure 4: Star Structure of the Power Supply
3.4.3. Reference Design for Power Supply
The power design for the module is very important, as the performance of the module largely depends on
the power source. The power supply of SC262R series module should be able to provide sufficient current
of at least 3 A. If the voltage drop between the input and output is not too high, it is suggested to use an
LDO to supply power for the module. If there is a big voltage difference between the input source and the
desired output (VBAT), a buck converter is recommended.
The following figure shows a reference design for +5 V input power source. The typical output voltage is
3.8 V and the maximum load current is 5.0 A.
DC_IN
C1
C2
U1
IN
OUT
E
N
G
N
D
A
D
J
2
4
1
3
5
VBAT
100 nF
C3
470
μF
C4
100 nF
R2
100K
47K
R3
470
μF
470R
51K
R4
R1
1%
1 %
Figure 5: Reference Circuit of Power Supply
1. It is recommended to switch off the power supply when the module is in abnormal state, and then
switch on the power to restart the module.
NOTE
