User's Guide

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 Peripheral Ports
Rev. 4.7.1 Page 80 of 124 2019-11-21
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: Titan_LE920A4_LE910Cx_Wi-Fi_Interface_Application_Note_r1
Table 32 lists the module’s SD card signals.
Ref 7: Antenna Detection Application Note
Ref 10: LE920A4 Thermal Guidelines