SAMSUNG Proprietary-Contents may change without notice
SGH-P408 Circuit Description
2-
5
This Document can not be used without Samsung's authorization
3. IRDA
This system uses IRDA module, HSDL_3201, HP's. This has signals,
IRDA_EN(enable signal), IRDA_RX(input data) and IRDA_TX(output data).
These signals are connected to PPI of trident. It uses two power signals.
V_ccd is used for circuit and V_bat is used for LED.
4. Keypad connector
This is consisted of key interface pins among PPI 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.
Eighteen key LED use the V_bat 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 key FPCB.
5. EMI Filtering
This system uses the shunt capacitors to reduce noise from LCD part. Some
control signals are connected to LCD without EMI filtering.
3) IF connetor
It is 24-pin connector, and uses 18-pin at present. They are designed to use
SDS, DEBUG, DLC-DETECT, JIG_ON, VEXT, VTEST, VF, CF, VBAT and GND.
They connected to power supply IC, microprocessor and signal processor IC.