User Guide

Due to location of the SIM card, removal of the battery causes quick power down of the SIM IF. The EM ASIC

(N2200) SIM1 interface supports both the 1.8V and 3.0V SIM cards.

SIM interface voltage is first 1.8V when the SIM card is inserted and if the card does not response to the ATR

(answer to reset) 3V interface voltage is used.

Battery interface

The battery interface supports a 3-pole battery interface. The interface consists of three connectors: VBAT,

BSI and GND.

The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.

Figure 72 Battery pin order

Table 13 Battery interface connections

Pin Signal I/O Engine connection Notes

1 VBAT -> EM ASIC N2200 VBAT Battery voltage

2 BSI -> EM ASIC N2200 BSI Battery size

indication

(fixed resistor

inside the

battery pack)

3 GND GND Ground

Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which

is located on the transceiver PWB, at a place where the phone temperature is most stable.

For service purposes, the device SW can be forced into local mode by using pull down resistors connected to

the BSI line.

RM-170; RM-171

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