Specifications

Cinterion
®
EHS8 Hardware Interface Overview
2.1 Application Interface
24
 EHS8_HIO_v04.000 2019-03-04
Confidential / Preliminary
Page 16 of 42
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 EHS8 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.
2.1.5 Digital Audio Interface
EHS8‘s digital audio interface (DAI) can be used to connect audio devices capable of pulse
code modulation (PCM) or be used as inter IC sound interface. Operation of these interface
variants is mutually exclusive, and can be configured by AT command (see [1]).
SIM
CCVCC
CCRST
CCIO
CCCLK
220nF
1nF
CCIN
V180