Quectel EC25-AUX Hardware Design page 60

PM_ENABLE 127
WAKE_ON_
135
WIRELESS
COEX_UART_RX 137
COEX_UART_TX 138
WLAN_SLP_CLK 118
BT Part
BT_RTS 37
BT_TXD 38
BT_RXD 39
BT_CTS 40
1)
PCM_IN 24
1)
PCM_OUT 25
1)
PCM_SYNC 26
1)
PCM_CLK 27
BT_EN 139
The following figure shows a reference design of wireless connectivity interfaces with Quectel FC20
module.
EC25_Hardware_Design
DO WLAN power control
Wake up the host (EC25 module) by
DI
FC20 module
DI LTE/WLAN&BT coexistence signal
DO LTE/WLAN&BT coexistence signal
DO WLAN sleep clock
DI BT UART request to send
DO BT UART transmit data
DI BT UART receive data
DO BT UART clear to send
DI PCM data input
DO PCM data output
PCM data frame synchronization
IO
signal
IO PCM data bit clock
BT function control via FC20
DO
module.
LTE Standard Module Series
EC25 Hardware Design
1.8V power domain
Active high.
1.8V power domain
1.8V power domain.
Cannot be pulled up
before startup.
1.8V power domain.
Cannot be pulled up
before startup.
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain.
Cannot be pulled up
before startup.
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
Active high.
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