Charge Control; Audio - Nokia RH-66 Troubleshooting Manual

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If the charger is accepted and identified, the appropriate charging algorithm is initiated.

Charge Control

In active mode, charging is controlled by the UEMC's digital part. Charging voltage and
current monitoring are used to limit charging into a safe area. The UEMC has the
following programmable charge cut-off limits:
• VBATLim1 = 3.6 V (Default)
• VBATLim2L = 5.0 V
• VBATLim2H = 5.25 V
VBATLim1, 2L, and 2H are designed with hystereses. When the voltage rises above
VBATLim1, 2L, 2H+, charging is stopped by turning off the charging switch. No change is
done in operational mode. Charging restarts after the voltage has decreased below
VBATLim-.
There are two pulse-width modulation (PWM) frequencies in use depending on the type
of the charger. A 2-wire charger uses a 1 Hz, while a 3-wire charger uses a 32 Hz. The
duty cycle range is 0% to 100%. The maximum charging current is limited to 1.2 A.

Audio

The audio control and processing is provided by the UEMC, which contains the audio
codec, and the UPP, which contains the MCU and DSP blocks. These blocks handle and
process the audio data signals. The baseband supports three microphone inputs and two
earpiece outputs.
MIC1 input is used for the mobile terminal's internal microphone. MIC2 input is used for
headsets. MIC3 is not used. Every microphone input can have either a differential or
single-ended AC connection to the UEMC circuit. The internal microphone (MIC1) and
external microphone (MIC2) for Pop-port
microphone signals from different sources are connected to separate inputs at the
Issue 1 03/2005
Figure 12: Charging circuit
Figure 13: Charging circuity at the battery
©2005 Nokia Corporation
2115i/2116/2116i (RH-66)
Baseband Description and Troubleshooting
accessory detection are both differential. The
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