User's Manual

Wi-Fi&BT Module Series
FC20 Series Hardware Design
FC20_Series_Hardware_Design Confidential / Released 20 / 47
28, 29, 31,
36, 38~40,
43~45,
48~52
FC20 series is powered by VDD_3V3, and it is recommended to use power supply chip whose maximum
output current is more than 1.2A.
The following figure shows a reference design for VDD_3V3, which is controlled by PM_ENABLE. And
PM_ENABLE should be connected to pin 127 of EC20 R2.0/EC21/EC25. For more details, please refer to
document [2], [3] or [4].
TPS630242
L1
L1
L2
L2
VIN
VIN
VIN
VINA
GND
EN
VOUT
VOUT
VOUT
PFM/PWM
FB
PGND
D2
D3
E1
E2
E3
E4
C4
D1
B1
A1
L1 L2
PGND
PGND
U402
D4
B2
B3
A2
A3
A4
B4
C1
C2
C3
C406
R408
C405
10uF
1M
L401
1uH
R407
100K
22uF
C407
22uF
PM_ENABLE
DC_5V
DC_5V
VDD_3V3
Figure 3: Reference Circuit for VDD_3V3