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BT_EN
10
BT_WAKE_
46
HOST
PCM_IN
13
PCM_SYNC
14
PCM_CLK
15
PCM_OUT
16
BT_UART_
7
RTS
BT_UART_
8
CTS
BT_UART_
17
TXD
BT_UART_
18
RXD
Coexistence Interface
Pin Name
Pin No.
LTE_UART_
5
TXD
FC21_Hardware_Design
DI
BT function control
OD
BT wake up the host
DI
BT PCM data input
BT PCM data frame
DI
synchronization
signal
BT PCM data bit
DI
clock
DO
BT PCM data output
BT UART request to
DO
send
BT UART clear to
DI
send
BT UART transmit
DO
data
BT UART receive
DI
data
I/O
Description
LTE/Wi-Fi&BT
DO
coexistence signal
Wi-Fi&BT Module Series
FC21 Hardware Design
V
min=-0.3V
1.8V power domain.
IL
V
max=0.54V
Active high.
IL
V
min=1.26V
If unused, keep this
IH
V
max=2.0V
pin open.
IH
1.8V power domain.
Active low.
V
max=0.18V
OL
Pulled up internally.
V
min=1.62V
OH
If unused, keep this
pin open.
V
min=-0.3V
IL
1.8V power domain.
V
max=0.54V
IL
If unused, keep this
V
min=1.26V
IH
pin open.
V
max=2.0V
IH
V
min=-0.3V
IL
1.8V power domain.
V
max=0.54V
IL
If unused, keep this
V
min=1.26V
IH
pin open.
V
max=2.0V
IH
V
min=-0.3V
IL
1.8V power domain.
V
max=0.54V
IL
If unused, keep this
V
min=1.26V
IH
pin open.
V
max=2.0V
IH
1.8V power domain.
V
max=0.18V
OL
If unused, keep this
V
min=1.62V
OH
pin open.
1.8V power domain.
V
max=0.18V
OL
If unused, keep this
V
min=1.62V
OH
pin open.
V
min=-0.3V
IL
1.8V power domain.
V
max=0.54V
IL
If unused, keep this
V
min=1.26V
IH
pin open.
V
max=2.0V
IH
1.8V power domain.
V
max=0.18V
OL
If unused, keep this
V
min=1.62V
OH
pin open.
V
min=-0.3V
IL
1.8V power domain.
V
max=0.54V
IL
If unused, keep this
V
min=1.26V
IH
pin open.
V
max=2.0V
IH
DC Characteristics
Comment
V
max=0.18V
1.8V power domain.
OL
V
min=1.62V
If unused, keep this
OH
17 / 52
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