User's Manual

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 Peripheral Ports
Rev. 4.3 Page 80 of 123 2017-12-07
NOTE:
SD/MMC is supported only on the Linux side.
The VMMC supply is limited to 50 mA max and can be used only to supply
the MMC card external pull-up resistors.
Pull-up resistors must be placed on the host application board.
The card detection input has an internal pull-up resistor.
NOTE:
The power supply to the SD/MMC card VCC is to be provided by the Host
application board. The module does not provide a dedicated power supply
for the SD/MMC card.
VMMC can be used to enable the external power supply (LDO Enable
signal).
8.5.4. WiFi (SDIO) Control Interface
The module provides an SDIO port supporting the SDIO3.0 specification, which can be
used to interface with a WiFi chipset (a Qualcomm QCA65x4 chipset or other WiFi
solutions - TBD)
The module includes an integrated SW driver for supporting the Qualcomm QCA65x4
chipset.
The SDIO port supports the SDIO 3.0 specification at 1.8V CMOS only, thus cannot be
used as an external SD/MMC card connection.
The module supports an LTE/WiFi coexistence mechanism via the WCI (Wireless
Coexistence Interface) port, which connects between the module and the external WiFi
IC.
For a detailed explanation, refer to Ref 6: Telit_LE920A4_LE910Cx_Wi-
Fi_Interface_Application_Note_r1.
Table 32: WiFi (SDIO) Control Interface
PAD Signal I/O Function Type Comments
AB3 WiFi_SD_CMD I/O WiFi SD Command 1.8V
AM3 WiFi_SD_CLK O WiFi SD Clock 1.8V 200 MHz
max.
AD3 WiFi_SD_DATA0 I/O WiFi SD Serial Data 0 1.8V
AF3 WiFi_SD_DATA1 I/O WiFi SD Serial Data 1 1.8V