LTE Standard Module Series
EC200U_Series_Hardware_Design 52 / 94
Table 25: Pin Definition of WLAN Interface
The SDIO interface rate is very high. To ensure that the interface design complies with the SDIO 1.1
specification, the following principles are recommended:
⚫ It is important to route the SDIO signal surrounded with ground on the layer and ground planes above
and below. The impedance of SDIO data 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 trace length difference between WLAN_SDIO_CLK and
WLAN_SDIO_DATA [0:3]/ WLAN_SDIO_CMD less than 1 mm and the total routing length less than
50 mm.
⚫ Make sure the adjacent trace spacing is more than two times of the trace width and the load
capacitance of SDIO bus should be less than 15 pF.
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