Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 62 / 134
Module
WAKE_ON_WIRELESS
WLAN_SLP_CLK
PM_ENABLE
DCDC/LDO
32KHZ_IN
WAKE_ON_WIRELESS
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
BT_EN
BT_RTS
BT_CTS
BT_TXD
BT_RXD
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
BT_EN
BT_UART_RTS
BT_UART_CTS
BT_UART_RXD
BT_UART_TXD
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
VDD_EXT VIO
COEX_UART_TX
COEX_UART_RX LTE_UART_TXD
LTE_UART_RXD
COEX
Bluetooth
Figure 26: 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. BT function is under development.
3.
1)
Pins 24–27 for PCM function are used for audio design on EC25 module and BT function on FC20
module.
4. For more information about wireless connectivity interfaces, please refer to document [5].
3.14.1. WLAN Interface
EC25 provides a low-power SDIO 3.0 interface and control interface for WLAN design.
SDIO interface supports SDR mode, and the maximum frequency is up to 50 MHz.
As SDIO signals are very high-speed, in order to ensure the SDIO interface design corresponds with the
SDIO 3.0 specification, please comply with the following principles:
NOTES