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Cinterion
®
EMS31-V Hardware Interface Overview
2.1 Application Interface
18
EMS31_V_HIO_v00.004
2018-02-27
Confidential / Preliminary
Page 12 of 35
The figure below shows a circuit to connect an external SIM card holder.
Figure 4:
External UICC/SIM/USIM card holder circuit
The total cable length between the SMT application interface pads on EMS31-V and the pads
of the external SIM card holder must not exceed 100mm in order to meet the specifications of
3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.
To avoid possible cross-talk from the CCCLKx signal to the CCIOx signal be careful that both
lines are not placed closely next to each other. A useful approach is using a GND line to shield
the CCIOx line from the CCCLKx line.
SIM
CCVCC
CCRST
CCIO
CCCLK
220nF
1nF
CCIN
V180
R 220k
Switch position (SIM inserted )
Switch position (SIM
not inserted)
4k7