nRF9161 supports only the Universal Integrated Circuit Card (UICC) Class C interface with 1.8 V nominal voltage as described in ETSI TS 102 221. The electrical specifications for all UICC signals that should be verified in product design and prototyping phase are defined in ETSI TS 102 221, chapter Electrical specifications of the UICC. ETSI documents can be downloaded from ETSI.
| Test item | ETSI test ID | Temp/ Voltage | Expected result | Note |
|---|---|---|---|---|
| Supply voltage VSIM | 5.3.1 | TYP/TYP | 1.75–1.85 V | ETSI specification minimum 1.62 V |
| Reset signal | 5.3.2 | Voh > 1.5 V Vol < 0.3 V tR/tF < 400 μs |
Rise and fall time can be impacted by EMI/ESD protection | |
| Clock signal | 5.3.3 | Voh > 1.5 V Vol < 0.3 V tR/tF < 50 ns |
Rise and fall time can be impacted by EMI/ESD protection | |
| I/O signal | 5.3.4 | Voh > 1.5 V Vol < 0.3 V tR/tF < 50 ns |
Rise and fall time can be impacted by EMI/ESD protection |
Basic UICC verification can be done with an oscilloscope. If a more advanced test setup is needed, equipment such as a Comprion UICC test platform can be used.
If a device has a user-accessible slot for an ICC card, ESD sensitivity should be verified against type approval limits. The nRF9161 internal ESD protection is intended for a 1.5 kV Human Body Model (HBM) level. An external ESD/EMI filter is recommended between the UICC card slot and the nRF9161 System in Package (SiP). For an example case, see nRF9161 DK Hardware files. For more information, see UICC in nRF9161 Hardware Design Guidelines.