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2. SGH-X430 Circuit Description
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3. Keypad connector
This is consisted of key interface pins in the trident, KEY_ROW[0~4] and
KEY_COL[0~4]. These signals compose the matrix. Result of matrix informs
the key status to key interface in the trident. Some pins are connected to
varistor for ESD protection. And power on/off key is seperated from the
matrix.
So power on/off signal is connected with PSC2106 to enable PSC2106.
SVC_GREEN, SVC_RED and SVC_BLUE are from OCTL of CSP1093.
These signals decide the color of LED, service indicator.
Nine key LED use the +VBATT supply voltage. These are connected to
BACKLIGHT signal in the PSC2106.
This signal enables LEDs with current control. FLIP_SNS informs the status
of folder (open or closed) to the trident. This uses the hall effect IC,
A3210ELH.
A magnet under main LCD enables A3210ELH which is on the main PCB.
4. EMI Filtering
This system uses the EMI Filter to reduce noise from LCD part. Some
control signals are connected to LCD without EMI filtering.
3) IF connetor
It is 23-pin connector, and uses 18-pin at present. They are designed to use
SDS, DEBUG, DLC-DETECT, JIG_ON, VEXT, VTEST, VF, +VBATT and GND.
They connected to power supply IC, microprocessor and signal processor IC.
4) Audio
AOUTAP, AOUTAN from CSP1093 is connected to the speaker via analog
switch. AOUTBP and AOUTBN are connected to the ear-mic speaker via
ear-jack. MICIN and MICOUT are connected to the main MIC. And AUXIN and
AUXOUT are connected to the Ear-mic.
YMU762MA3 is a LSI for portable telephone that is capable of playing high
quality music by utilizing FM synthesizer and ADPCM decorder that are
included in this device.
As a synthesis, YMU762MA3 is equipped 16 voices with differenttones. Since
the device is capable of simultaneously generating up to synchronous with the
play of the FM synthesizer, various sampled voices can be used as sound
effects.
