Service Manuals, User Guides, Schematic Diagrams or docs for : motorola Mobile Phone W206_W213_sm CD_W206_W213_A4_C_L3_V1
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W206 W213
Level 3
Circuit Description
15 August 2007
V1.0
W206/W213 Level 3 C
Index
1 Receive..................................................................................................................................4
1.1 Band selection ...............................................................................................................4
1.2 Locosto RX Mode...........................................................................................................5
1.3 Audio Codec ...................................................................................................................6
1.3.1 Voice Downlink Patch ....................................................................................................7
1.4 Earpiece Receiver ..........................................................................................................7
1.5 Headset...........................................................................................................................7
1.6 Speaker Phone...............................................................................................................7
1.7 Data Download Receive Path ......................................................................................8
1.8 FM Radio(only available for W213) ............................................................................8
2 Transmit...............................................................................................................................8
2.1 Audio (Voice uplink Patch)...........................................................................................8
2.2 Data Download Transmit Path ....................................................................................9
2.3 Stereo Audio Path .........................................................................................................9
2.4 Modulation....................................................................................................................10
2.4.1 Transmit Section .......................................................................................................11
2.4.2 Digitally- Controlled Crystal Oscillator (DCXO).....................................................12
2.5 RF TX PA.......................................................................................................................13
2.6 TX PA Power Control in SKY77318 U201 ................................................................13
3 Triton-Lite Monitoring ADC ...........................................................................................14
4 Baseband Serial Port (BSP)..............................................................................................15
5 Microcontroller Serial Port (USP)...................................................................................15
6 General purposes I/O (GPIO) ..........................................................................................15
7 CSTN LCD Display...........................................................................................................17
7.1 Display Backlights .......................................................................................................18
8 32kHz RTC ........................................................................................................................18
9 SIM Card Circuit ..............................................................................................................18
9.1 SIM Card Supply Voltage Generation.......................................................................19
10 Keypad................................................................................................................................19
10.1 Keypad Matrix ..............................................................................................................20
11 Vibrator circuit..................................................................................................................20
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W206/W213 Level 3 C
12 Memory ..............................................................................................................................20
13 Power ..................................................................................................................................21
13.1 Low-Dropout Voltage Regulators .............................................................................21
13.2 Power Down Methods ................................................................................................22
14 Sleep Module......................................................................................................................22
14.1 Sleep Up Sequence .....................................................................................................23
14.2 Sleep off Sequence .....................................................................................................23
15 Power Tree .........................................................................................................................24
16 Charging Circuit and External Power ............................................................................24
16.1 Battery Support ...........................................................................................................24
16.2 Charger Support ..........................................................................................................24
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W206/W213 Level 3 C
1 Receive
1.1 Band selection
The radio frequency signal is received from internal PIFA-type antenna. Received
GSM RF signal enters to PCB through the RF switch JP201. At this moment the T/R switch
SW201 is switched to RX mode to let the signal input to next stage. Then the signal goes
into SAW filter, BF201 and BF202 , which reject out-band signal and transfer the signal
from single-end to balanced. And the matching circuits between T/R switch and SAW
filter reduce the unwanted RF signal reflection and provide a flat frequency response in the
operation band. Finally the received signal will fed into Locosto Plus U101 DRP core
through a balanced MLCC matching network. The following table describes the control
voltages of T/R
SW_LO_TX SW_HI_TX VAPC switch and PA:
PA_EN BS1
W375 EU PIN 5 PIN 2 PIN 20
TP201 TP202
of T201 of T201 of U201 The RF signal
is received by
Standby Low x Low Low x
internal antenna
RX EGSM900 Low Low Low Low Low or by RF plug,
RX DCS1800 Low Low Low Low High and the signal is
passing through
TX GSM900 High High High High Low the RF switch
TX DCS1800 High High High High High JP201 and then
fed into T/R
switch. The low band (GSM900) RX received signal is transmitted from SW201 (Pin 11)
and input to low-band SAW filter BF201, while the high band (DCS1800) RX received
signal from SW201 (Pin 1) and then input to high-band SAW filter BF202. The last stage
of RX on PCB is Locosto U101 (Loocsto-Plus), and the DRP process will make the signal
into binary data.
Figure 1: Locosto TX/RX Paths Description
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W206/W213 Level 3 C
1.2 Locosto RX Mode
Figure 2: Locosto RX Signal Process
As described in Figure 2, when the RF signal is input to Locosto, it will be amplified by
a differential LNA in advance, in order to obtain a better NF in the last receiving stage.
And then it will be turned into discrete IF signal by a high-speed mixer. After passing
through a filter and an A/D converter, the discrete signal will become digital signal and
then input to Locosto core to do DSP process. The detail RX signal route is depicted as
below:
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W206/W213 Level 3 C
Figure 3: Baseband Downlink Block Diagram
Figure 3: Audio Codec Block Diagram
1.3 Audio Codec
The Audio codec consist of a voice codec dedicated to GSM application and an audio stereo
line. The voice codec circuitry processes analog audio components in the uplink path and
applies this signal to the voice signal interface for eventual baseband modulation. In the
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W206/W213 Level 3 C
downlink path, the codec circuitry changes voice component data received from the voice
serial interface into analog audio. The voice codec support an 8/16 kHz sampling
frequency. The stereo audio path converts audio component data received from the I2S
serial interface into analog audio. The following paragraphs describe these
uplink/downlink and audio stereo functions in more details.
1.3.1 Voice Downlink Patch
The VDL path receives speech samples at the rate of 8 kHz from the Locosto-Plus IC U101
(DSP) via the VSP and converts them to analog signals to drive the external speech
transducer.
The digital speech coming from the Locosto-Plus IC U101 (DSP) is first fed to a speech
digital filter that has two functions. The first function is to interpolate the input signal and
to increase the sampling rate from 8 kHz up to 40 kHz to allow the digital-to-analog
conversion to be performed by an over-sampling digital modulator. The second function is
to band-limit the speech signal with both low-pass and high-pass transfer functions. The
filter, the PGA gain, and the volume gain can be bypassed by programming.
The interpolated and band-limited signal is fed to a second order - digital modulator
sampled at 1 MHz to generate a 4-bit (9 levels) over-sampled signal. This signal is then
passed through a dynamic element-matching block and then to a 4-bit digital-to-analog
converter (DAC).
Due to the over-sampling conversion, the analog signal obtained at the output of the 4◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo