Charge Control; Audio - Nokia NPD-1 Series Troubleshooting - Bb

CCS Technical Documentation
The charger recognition is initiated when the EM SW receives a "charger connected"
interrupt. The algorithm basically consists of the following three steps:
1 Check that the charger output (voltage and current) is within safety limits.
2 Identify the charger as a two-wire or three-wire charger.
3 Check that the charger is within the charger window (voltage and current).
If the charger is accepted and identified, the appropriate charging algorithm is initiated.
Tom ahawk Charger
connector
X102
+ VCHAR
GND

Charge Control

In active mode charging is controlled by UEM's digital part. Charging voltage and current
monitoring is used to limit charging into safe area. For that reason UEM has programma-
ble charging cut-off limits:
VBATLim1=3.6 V (Default)
VBATLim2L=5.0 V and
VBATLim2H=5.25 V
VBATLim1, 2L, 2H are designed with hystereses. When the voltage rises above VBATLim1,
2L, 2H+ charging is stopped by turning charging switch OFF. No change in operational
mode is done. After voltage has decreased below VBATLim-, charging re-starts.
There are two PWM frequencies in use depending on the type of the charger: two-wire
charger uses a 1 Hz and a three-wire charger uses a 32 Hz. Duty cycle range is 0% to
100%. Maximum charging current is limited to 1.2 A.

Audio

UEM handles the audio control and processing, including the audio codec. UPP, which
contains the MCU and DSP blocks, handles and processes the audio data signals.
The baseband supports three microphone inputs and two earpiece outputs. The micro-
phone inputs are MIC1, MIC,2 and MIC3. MIC1 input is used for the phone's internal
microphone; MIC2 input is used for headsets (HDB-4, BHF-1, and CARK-126), Loopset
(LPS-4). MIC3 input is used for third-party accessories (2.5mm Jack). Every microphone
Issue 1 11/2002
F100
L100
________
42R/100MHz
1.5A
C106
1n0
Figure 16: Charging circuit
Nokia Corporation
Troubleshooting — BB
V100
1PMT16AT3
GND
Confidential
NPD-1
0
1
2
CHARGER(4:0)
Page 21