User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 77 of 124 2019-07-15
NOTE:
SD/MMC is supported only on the Linux side.
The power supply to the SD/MMC card is to be provided by the Host
application board. The LE910Cx does not provide a dedicated power supply
for the SD/MMC card.
VMMC Supply is limited to 50mA thus can only 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.
VMMC can be used for enabling of the external power supply (LDO Enable
signal)
8.5.4. WiFi SDIO Interface
The LE910Cx provides an SDIO port supporting the SDIO3.0 specification, which can be
used to interface with a WiFi chipset (Qualcomm QCA65x4 chipset or other WiFi
solutions). The LE910Cx module includes an integrated SW driver to support the
Qualcomm QCA6574 chipset.
NOTE:
Qualcomm QCA9377 WiFi chipset may be supported on some of the
LE910Cx variants.
Please contact your Telit representative for more details.
The LE910Cx 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 LE910Cx 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 5: Telit_LE920A4_LE910Cx_Wi-
Fi_Interface_Application_Note_r1.
Table 30: WiFi SDIO Interface Signals
PAD
Signal
I/O
Function
Type
Comments
N13
WIFI_SD_CMD
O
WiFi SD Command
1.8V
L13
WIFI_SD_CLK
O
WiFi SD Clock
1.8V
200 MHz
max.
J13
WIFI_SD_DATA0
I/O
WiFi SD Serial Data 0
1.8V