User Guide

RH-48

Troubleshooting — BB CCS Technical Documentation

Table 2: RH-48 RF regulators

The charge pump that is used by VR1A is constructed around UEM. The charge pump

works with Cbus (1.2 MHz) oscillator and gives a 4.75 V regulated output voltage to RF.

Table 1: RH-48 Baseband regulators

Regulator

Maximum current

(mA)

Vout (V) Notes

VCORE 300 1.5 Output voltage selectable 1.0V/1.3V/1.5V/1.8V

Power up default 1.5V

VIO 150 1.8 Enabled always except during power-off mode

VFLASH1 70 2.78 Enabled always except during power-off mode

VFLASH2 40 2.78 Enabled only when data cable is connected

VANA 80 2.78 Enabled only when the system is awake (Off

during sleep and power off-modes)

VSIM 25 3.0 Enabled only when SIM card is used

Regulator

Maximum current

(mA)

Vout (V) Notes

VR1A 10 4.75 Enabled when cell transmitter is on

VR1B 10 4.75 Enabled when the transmitter is on

VR2 100 2.78 Enabled when the transmitter is on

VR3 20 2.78 Enabled when SleepX is high

VR4 50 2.78 Enabled when the receiver is on

VR5 50 2.78 Enabled when the receiver is on

VR6 50 2.78 Enabled when the transmitter is on

VR7 45 2.78 Enabled when the receiver is on