LTE Standard Module Series
EG25-GL_Hardware_Design 50 / 96
⚫
It is important to route the SDIO signal traces with total grounding. The impedance of SDIO data
trace is 50
Ω (±10%).
⚫
Make sure the adjacent trace spacing is twice of the trace width and the load capacitance of SDIO
bus should be less than 15 pF.
⚫
It is recommended to keep the trace length difference between SD_CLK and SD_DATA[0:3]/
SD_CMD less than 1mm and the total routing length less than 50 mm. The total trace length inside
the module is 27 mm, so the exterior total trace length should be less than 23 mm.
4.6 WLAN and Bluetooth Application Interfaces
The module supports a SDIO 3.0 interface for WLAN function, and UART and PCM interfaces for
Bluetooth function
*
. The following table shows the pin definition of WLAN and Bluetooth application
interfaces.
Table 16: Pin Definition of WLAN & Bluetooth Application Interfaces
Pin Name
Pin No.
I/O
Description
Comment
WLAN Application Interfaces
SDC_DATA0 132
DIO
WLAN SDIO data bit 0
1.8 V power domain.
If unused, keep it open.
SDC_DATA1 131
DIO
WLAN SDIO data bit 1
SDC_DATA2 130
DIO
WLAN SDIO data bit 2
SDC_DATA3 129
DIO
WLAN SDIO data bit 3
SDC_CLK
133
DO
WLAN SDIO clock
SDC_CMD
134
DO
WLAN SDIO command
WLAN_EN
136
DO
WLAN function enable control
1.8 V power domain.
Active high.
Cannot be pulled up before startup.
If unused, keep it open.
Coexistence and Control Interfaces
WLAN_SLP_
CLK
118
DO
WLAN sleep clock
If unused, keep it open.
WLAN_PWR
_EN
127
DO
WLAN power supply enable
control
1.8 V power domain. Active high.
If unused, keep it open.
WAKE_ON_
135
DI
Wi-Fi/Bluetooth wakeup
FC20 series or FC21 module wakes
