Dc Characteristics - Nokia RH-6 Series Baseband Description & Troubleshooting

RH-6
6 - BB Description & Troubleshooting
less of DSP writings.
VBAT is furthermore distributed, unregulated, to the RF power amplifier, audio power
amplifier and external baseband regulators.
The CHACON module in the UEM controls the charging of the main battery. Furthermore
it contains a 3.2 Vdc regulator for charging of the backup battery and a 1.8 Vdc regulator
supplying the internal real time clock.

DC characteristics

The following table reflects the specifications of voltage and current regulators within
the UEM:
Regulator
VR1A
4
VR2
VR3
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Figure 3: Baseband power distribution
Table 2: UEM regulator outputs
Output Voltage (V)
Target
Min Typ
RF 4.6 4.75
RF 2.70 2.78
RF 2.70 2.78
© 2003 Nokia Corporation.
CCS Technical Documentation
Output Current
(mA)
Max Min Max
4.9 0 10
2.86 0.1 100
2.86 0.1 20
Issue 1 10/2003