User's Manual
Wi-Fi&Bluetooth Module Series
FC41D_Hardware_Design
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3.4. Power Supply Design
3.4.1. Pin Description
The following table shows the power supply pin and ground pin of FC41D module.
Table 5: Definition of Power Supply and GND Pins
FC41D module is powered by VBAT, and it is recommended to use a power supply chip with sufficient
current of at least 0.3 A. In order to achieve better power supply performance, it is recommended to
parallel 22 μF decoupling capacitor and 1 μF,100 nF filter capacitor near the module’s VBAT pin. At the
same time, it is suggested to add a TVS near the VBAT to improve the surge voltage bearing capacity of
the module. In principle, the longer the VBAT line is, the wider it should be.
VBAT reference circuit is shown as below:
Module
VBAT
VBAT
D1
C2
C3 C4
NM
C1
22 μF
1 μF
100 nF
R1 0R
Figure 2: VBAT Reference Circuit
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT
15
Power supply
3.0
3.3
3.6
V
GND
1, 3, 16, 27