Power Supply; Pin Introduction - Quectel FC21 Hardware Design

3.4. Power Supply

3.4.1. Pin Introduction

The following table shows the power supply pins and the ground pins of FC21. The VIO power supply is
recommended to be powered by VDD_EXT of EC2x&EG2x-G modules.
Table 5: Power Supply Pins and GND Pins
Pin Name Pin No.
VDD_3V3 21
VIO 11
1, 12, 20, 28,
29, 31, 36,
GND 38~40,
43~45,
48~52
FC21 is powered by VDD_3V3, and it is recommended to use a power supply chip with maximum output
current more than 0.6A.
The following figure shows a reference design for VDD_3V3. Pulling PM_ENABLE to a high voltage level
will enable VDD_3V3 power output. And this pin should be connected to pin 127 of EC2x&EG2x-G. For
more details, please refer to document [2], [3], [4], [5] or [6].
DC_5V
PM_ENABLE
FC21_Hardware_Design
Description
Main power supply for the
module
Power supply for the module's
I/O pins
Ground
L401
1 µH
U402
D1
B1
L1 L2
D2 B2
L1 L2
D3 B3
L2
L1
A1
E1 VOUT
VI N
C405 A2
E2 VOUT
VI N
10 µF A3
E3
VO UT
VI N
A4
FB
E4
VI NA
B4
PFM/PWM
D4
EN
C1
PG ND
R407
C2
PG ND
100K
C4
GND
C3
PG ND
TPS630242
Figure 3: Reference Circuit for VDD_3V3
Wi-Fi&BT Module Series
FC21 Hardware Design
Min. Typ. Max.
3.14 3.3 3.46
1.71 1.8 3.46
VDD_3V3
C406
C407
22 µF
22 µF
R408
DC_5V
1M
批注 [RL7]: 中文下面有个单独
的 3.4.1 引脚介绍， 是否要加上
Unit
V
V
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