Quectel EC25-AUX, Hardware Design

Page: 35 / 135

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 34 / 130
COEX_UART
_RX
137 DI
LTE/WLAN&BT
coexistence signal
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
Cannot be pulled up
before startup.
If unused, keep it
open.
COEX_UART
_TX
138 DO
LTE/WLAN&BT
coexistence signal V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
Cannot be pulled up
before startup.
If unused, keep it
open.
WLAN_SLP_
CLK
118 DO WLAN sleep clock
If unused, keep it
open.
BT_RTS 37 DI
BT UART request to
send
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep it
open.
BT_TXD 38 DO
BT UART transmit
data V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
BT_RXD 39 DI
BT UART receive
data
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep it
open.
BT_CTS 40 DO
BT UART clear to
send V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
Cannot be pulled up
before startup.
If unused, keep it
open.
BT_EN 139 DO
BT function control
via FC20 module V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
RF Interfaces
Pin Name Pin No. I/O Description DC Characteristics Comment
ANT_DIV 35 AI Diversity antenna
50 Ω impedance.
If unused, keep it
open.
ANT_MAIN 49 IO Main antenna 50 Ω impedance.
ANT_GNSS 47 AI GNSS antenna
50 Ω impedance.
If unused, keep it
open.