User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 102 of 124 2019-07-15
SIM Interface
This section presents the recommended schematics for the design of SIM interfaces on
the application boards. The LE910Cx supports two external SIM interfaces.
11.3.1. SIM Schematic Example
Figure 30 illustrates in particular how to design the application side and what values to
assign the components.
Figure 30: SIM Schematics
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 42 lists the values of C1 to be adopted with the LE910Cx product:
Table 42: SIM Interface – C1 Range
Product P/N
C1 Range (nF)
LE910Cx
100 nF