User's Manual

Cinterion
®
ELS61-US Hardware Interface Overview
2.1 Application Interface
21
 ELS61-US_HIO_v00.281 2016-02-11
Confidential / Preliminary
Page 14 of 40
The figure below shows a circuit to connect an external SIM card holder.
Figure 5: External UICC/SIM/USIM card holder circuit
The total cable length between the SMT application interface pads on ELS61-US 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 CCCLK signal to the CCIO 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 CCIO line from the CCCLK line.
SIM
CCVCC
CCRST
CCIO
CCCLK
220nF
1nF
CCIN
V180