User's Manual

FC20-N Series Hardware Design
FC20-N_Series_Hardware_Design Confidential / Released 18 /
47
RF_ANT
30
IO
WLAN and BT
antenna
50Ω impedance.
Other Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
DBG_TXD
4
DO
Software debugging
V
OL
max=0.18V
V
OH
min=1.62V
1.8V power domain.
If unused, keep this pin
open.
32KHz_IN
19
DI
Low power.
External 32.768KHz
clock input is
required in sleep
mode.
V
IL
min=-0.3V
V
IL
max=0.54V
V
IH
min=1.26V
V
IH
max=2.0V
1.8V power domain.
If unused, keep this pin
open.
RESERVED Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RESERVED
2, 3,
33~35,
37, 41,
42, 46, 47
Reserved
Keep these pins
unconnected.
FC20-N module does not support BT interface and coexistence interface.
3.4. Power Supply
The following table shows the power supply pins and the ground pins of FC20 series. The VIO is powered
by EC20 R2.0/EC21/EC25.
Table 5: Power Supply Pins and GND Pins
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VDD_3V3
21
Main power supply for module
3.14
3.3
3.46
V
VIO
11
Power supply for module IO
1.71
1.8
1.89
V
GND
1, 12, 20,
Ground
NOTE