User Guide

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Signal

name

Regulator Sleep Idle Nominal

voltage

Main user Notes Supply

VRCP1 AVILMA OFF OFF 4.75 RF module RF

active

VBAT

VOUT BETTY ON ON 2,5 ALS VBAT

VAUD LP3985 3,0 DAC33 On

when

used

VBAT

VCAM_1V8 LM3677 OFF OFF 1,8 Camera HWA ,

LP5952

VBAT

VCORE_1V3 LP5952 OFF OFF 1,3 Camera HWA

core

VCAM_1V8

(LM3677)

VCAM_2V8 LP3985 OFF OFF 2,8 Cameras VBAT

VCORE TPS62350 ON ON 1,2 Rapido core VBAT

VIO LM3677 ON ON 1.8 VIO, VDRAM VBAT

VDDB SD

levelshift

er,

LP2939

OFF OFF 2,9 SD card ON

when

used

VBAT

LEDOUT TK65604 OFF Keyboard and

display

backlights

VBAT

FLASH LED+

FLASH LED-

ADP1653 OFF OFF 4,5/5,5 Camera flash VBAT

VBAT 3,6

VCAM_ACT LP3985 OFF OFF 3.0 Camera VBAT

VOut TK63128 OFF OFF 2.8 NCW VBAT

Backup battery troubleshooting

Verify that the backup battery G2200 is empty (U<1V). Switch the phone on. Measure voltage of the battery

when the main battery is connected to the phone and the phone is switched on. Wait a few minutes and

monitor that the backup battery voltage rises. Switch off the phone, disconnect the main battery and monitor

that the voltage of the backup battery decreases. Normal behaviour of the voltage is described in the figures

below:

RM-348; RM-349; RM-350

Baseband Troubleshooting

Issue 2 COMPANY CONFIDENTIAL Page 3 –7