User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 54 / 90
COEX_UART_TX 138 DO LTE/WLAN&BT coexistence signal 1.8V power domain
WLAN_SLP_CLK 118 DO WLAN sleep clock
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
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 sync 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. Active high.
1.8V power domain
1. “*” means under development.
2.
1)
Pads 24~27 are multiplexing pins used for audio design on EC25 module and BT function on FC20
module.
The following figure shows a reference design of Wireless Connectivity interfaces with QuectelFC20
module.
NOTES