User Guide

NEM-2

System Module and User Interface CCS Technical Documentation

FM Radio

The FM radio in the transceiver NEM-2 is a single chip electronically tuned FM stereo

radio with fully integrated IF selectivity and demodulation. The FM radio is completely

adjustment free.

It can be tuned the European, US and Japanese FM bands.

The channel tuning and bus data are controlled by UPP.

The FM-antenna signal is generated out of the HSEARRN and HSEARN signals from the

bottom connector. FM-radio is only working when headset is connected because the

cable is used as FM-antenna.

SIM Interface

UEMK contains the SIM interface logic level shifting. SIM interface can be programmed

to support 3V and 1.8V SIMs. SIM supply voltage is selected by a register in the UEMK. It

is only allowed to change the SIM supply voltage when the SIM IF is powered down.

The SIM power up/down sequence is generated in the UEMK. This means that the UEMK

generates the RST signal to the SIM. Also the SIMCardDet signal is connected to UEMK.

The card detection is taken from the BSI signal, which detects the removal of the battery.

The SIM interface is powered up when the SIMCardDet signal indicates "card in". This

signal is derived from the BSI signal.

The entire SIM interface locates in two chips: UPP and UEMK.

The SIM interface in the UEMK contains power up/down, port gating, card detect, data

receiving, ATR-counter, registers and level shifting buffers logic. The SIM interface is the

electrical interface between the Subscriber Identity Module Card (SIM Card) and mobile

phone (via UEMK device).

The data communication between the card and the phone is asynchronous half duplex.

The clock supplied to the card is in GSM system 1.083 MHz or 3.25 MHz.

Parameter Variable Min. Typ Max Unit

SIMCARDet, BSI comparator Threshold Vkey 1.94 2.1 2.26 V

SIMCARDet, BSI comparator Hysteresis (1) Vsimhyst 50 75 100 mV