LTE Standard Module Series
EC200T Series Hardware Design
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3.13. WLAN
Interface*
①
EC200T series supports a SDIO 3.0 interface for WLAN.
The following table shows the pin definition of WLAN interface
Table 18: Pin Definition of WLAN Interface
As SDIO signals are very high-speed, in order to ensure the SDIO interface design meets SDIO 3.0
specification, please comply with the following principles:
It is important to route the SDIO signal traces with total grounding. The impedance of SDIO signal
trace is 50
Ω
±10%.
Keep SDIO signals far away from other sensitive circuits/signals such as RF circuits, analog signals,
etc., as well as noisy signals such as clock signals, DC-DC signals, etc.
It is recommended to keep the traces of WLAN_SDIO_CLK, WLAN_SDIO_DATA[0:3] and
WLAN_SDIO_CMD with equal length (the difference among them is less than 1 mm) and the total
routing length needs to be less than 50 mm.
Pin Name
Pin No.
I/O
Description
Comment
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
If unused, keep it open.
WLAN_SDIO_DATA3
129
IO
WLAN SDIO data bit 3
WLAN_SDIO_DATA2
130
IO
WLAN SDIO data bit 2
WLAN_SDIO_DATA1
131
IO
WLAN SDIO data bit 1
WLAN_SDIO_DATA0
132
IO
WLAN SDIO data bit 0
WLAN_SDIO_CLK
133
DO
WLAN SDIO clock
WLAN_SDIO_CMD
134
DO
WLAN SDIO command
WLAN_WAKE
135
DI
Wake up the host (module)
Wake up the host
(module) by an external
Wi-Fi module.
1.8 V power domain.
If unused, keep it open.
WLAN_EN 136
DO
WLAN function enable
control
1.8 V power domain
If unused, keep it open.
