NRF9160-SICA-R7 datasheet(362/400 Pages) NORDIC

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LTE modem

cellular IoT product, only UICCs supporting power down mode during PSM and eDRX idle mode sleep

intervals should be considered.

LTE modem controls the physical interfaces towards the UICC and implements the transport protocol over

the four-pin ISO/IEC 7816-3 interface:

• VCC (power supply): LTE modem drives this

• CLK (clock signal): LTE modem drives this

• RST (reset signal): LTE modem drives this

• I/O (input/output serial data): Bi-directional

The interface and the connections between LTE modem, UICC connector, and the ESD device is shown in

the figure below.

nRF91

SIM_RST

SIM_CLK

SIM_IO

SIM_VDD

ESD

RST_2

CLK_2

VCC

RST_1

CLK_1

IO_1

SIM card

connector

RST

CLK

I/O

IO_2

VCC

Figure 109: Connections between LTE modem, card connector, and the ESD device

Only standard transmission speeds are supported as specified in ETSI TS 102 221.

Important: LTE modem must be stopped through the modem API, before removing the UICC.

An ESD (electrostatic discharge) protection device compatible with UICC cards must be used between the

removable card and the LTE modem, to protect LTE modem against a harmful electrostatic discharge from

the card connector.

7.3 LTE modem coexistence interface

LTE modem uses a dedicated three-pin interface for RF interference avoidance towards a companion radio

device e.g. an external positioning device or Bluetooth Low Energy device.

The inputs and outputs for this interface:

• COEX0: Input to the LTE modem from the external device. When active high, indicates that the external

device transceiver is turned on.

• When internal GPS is used, COEX0 can be used as active high control for the external LNA

component.

• COEX1: Output from the LTE modem to the external device. Active high time mark pulse, which is

synchronous to LTE system time.

• When internal GPS is used, COEX1 delivers the GPS 1PPS (one pulse per second) time mark pulse.

• COEX2: Output from the LTE modem to the external device. When active high, indicates that the LTE

modem transceiver is turned on.

• COEX2 can also be treated as active low grant from LTE modem to the external device, indicating

grant to transmit and receive.

4418_1315 v2.0

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