Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 67 / 112
The following figure shows a reference design of wireless connectivity interfaces with Quectel FC20
module.
Module
WAKE_ ON_WIRELESS
WLAN_SL P_CLK
PM_ENAB LE
DCDC/LDO
32K HZ_IN
WAKE_ ON_WIRELE SS
FC20 Module
VDD_3V3
POWER
SDC1_DATA3
SDC1_DATA2
SDC1_DATA1
SDC1_DATA0
SDC1_CLK
SDC1_CMD
WLAN_EN
SDIO_D3
SDIO_D2
SDIO_D1
SDIO_D0
SDIO_CLK
SDIO_CMD
WLAN_EN
WLAN
VDD_EXT VIO
COEX_UART_TX
COEX_ UART_RX
LTE_UART_TXD
LTE_UART_RXD
COEX
Figure 30: Reference Circuit of Wireless Connectivity Interfaces with FC20 Module
1. FC20 module can only be used as a slave device.
2. When BT function is enabled on EC25 module, PCM_SYNC and PCM_CLK pins are only used to
output signals.
3. For more information about wireless connectivity interfaces, please refer to document [5].
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 BT module.
1.8V power domain
Active high.
NOTES