Quectel EG25-G - Page 53

LTE Module Series
EG25-G Hardware Design
EG25-G_Hardware_Design 52 / 100
COEX_UART_RX
137
DI
LTE/WLAN&BT* coexistence
signal
1.8V power domain
Cannot be pulled up before
startup
COEX_UART_TX
138
DO
LTE/WLAN&BT* coexistence
signal
1.8V power domain
Cannot be pulled up before
startup
BT Part*
BT_RTS*
37
DI
BT UART request to send
1.8V power domain
BT_TXD*
38
DO
BT UART transmit data
1.8V power domain
BT_RXD*
39
DI
BT UART receive data
1.8V power domain
BT_CTS*
40
DO
BT UART clear to send
1.8V power domain
Cannot be pulled up before
startup
PCM_IN
1)
24
DI
PCM data input
1.8V power domain
PCM_OUT
1)
25
DO
PCM data output
1.8V power domain
PCM_SYNC
1)
26
IO
PCM data frame synchronization
signal
1.8V power domain
PCM_CLK
1)
27
IO
PCM data bit clock
1.8V power domain
BT_EN*
139
DO
BT function control via FC20
module.
1.8V power domain.
Active high.
The following figure shows a reference design of wireless connectivity interfaces with Quectel FC20
module.