User's Manual

Cinterion

EHS6-A Hardware Interface Overview Page 16 of 41

2.1 Application Interface

 EHS6-A_HIO_v02.770 2014-08-13

Confidential / Preliminary

CCIO Serial data line, input and output.

CCRST Chipcard reset

CCIN

Input on the baseband processor for detecting a SIM card tray in the holder. If the SIM is

removed during operation the SIM interface is shut down immediately to prevent

destruction of the SIM. The CCIN signal is by default low and will change to highl evel if a

SIM card is inserted.

The CCIN signal is mandatory for applications that allow the user to remove the SIM card

during operation.

The CCIN signal is solely intended for use with a SIM card. It must not be used for any

other purposes. Failure to comply with this requirement may invalidate the type approval

of EHS6-A.

Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered after

removing the SIM card during operation. Also, no guarantee can be given for properly

initializing any SIM card that the user inserts after having removed the SIM card during

operation. In this case, the application must restart EHS6-A.

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 EHS6-A 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

220 nF

1 nF

CCIN

V180