LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 110 of 149 2023-03-16
Not Subject to NDA
Note: The resistor value on SIMIO pulled up to SIMVCC must be
defined to be compliant with the 3GPP specification for USIM
electrical testing.
The LE910Cx module contains an internal pull-up resistor of 10K Ω
on SIMIO.
However, the un-mounted R1 option in the application can be used to
tune SIMIO timing if necessary.
Table 45 lists the values of C1 to be adopted with the LE910Cx product:
Product P/N C1 Range (nF)
LE910Cx 100 nF
Table 45: SIM Interface – C1 Range
EMC Recommendations
All LE910Cx signals are provided with some EMC protection. However, the accepted level
differs according to the specific pin.
Human body model (HBM) rating: 2000 V, JESD22-A114
Charged device model (CDM) rating: 500 V, JESD22-C101
Appropriate series resistors must be considered to protect the input lines from
overvoltage.
Download and Debug Port
Choose one of the following options in the design of the host system to download or
upgrade the Telit software and debug the LE910Cx module when it is already mounted on
a host system.
UART and USB interfaces.
Users who use both UART and USB interfaces to communicate with the LE910Cx
module must implement a USB download method in the host system to upgrade
the LE910Cx when it is mounted.
USB interface only.
Users who use a USB interface only to communicate with the LE910Cx module
must arrange for a USB port in the host system to debug or upgrade the LE910Cx
when it is mounted.
UART interface only.
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