Product Info

LTE Standard Module Series
EC21 Hardware Design
EC21_Hardware_Design 60 / 120
Table 16: Pin Definition of Wireless Connectivity Interfaces
Pin Name Pin No. I/O Description Comment
WLAN Part
SDC1_DATA3 129 IO WLAN SDIO data bus D3 1.8V power domain
SDC1_DATA2 130 IO WLAN SDIO data bus D2 1.8V power domain
SDC1_DATA1 131 IO WLAN SDIO data bus D1 1.8V power domain
SDC1_DATA0 132 IO WLAN SDIO data bus D0 1.8V power domain
SDC1_CLK 133 DO WLAN SDIO bus clock 1.8V power domain
SDC1_CMD 134 IO WLAN SDIO bus command 1.8V power domain
WLAN_EN 136 DO
WLAN function control via FC20
module.
1.8V power domain
Active high.
It cannot be pulled up
before startup
Coexistence and Control Part
PM_ENABLE 127 DO WLAN power control
1.8V power domain.
Active high.
WAKE_ON_
WIRELESS
135 DI
Wake up the host (EC21
module) by FC20 module
1.8V power domain
COEX_UART_RX 137 DI
LTE/WLAN&BT coexistence
signal
1.8V power domain.
It cannot be pulled up
before startup
COEX_UART_TX 138 DO
LTE/WLAN&BT coexistence
signal
1.8V power domain.
It cannot be pulled up
before startup
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
It cannot be pulled up
before startup