SAMSUNG Proprietary-Contents may change without notice
Circuit Description
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2-
3
2. Connector
2-1. LCD Connector
LCD is consisted of main LCD(color 65K TFT LCD).
Chip select signals in the
U400
, LCD_MAIN_CS, can enable LCD. BACKLIGHT signal enables white LED of main
LCD. This signal is from IO part of the DSP in the U300(Main Chip). "LCD_RESET" signal initiates the Reset process
of the LCD.
16-bit data lines(LD(0)~LD(15)) transfers data and commands to LCD through by pass capacitor. Data and commands use
"RS" signal. If this signal is high, Inputs to LCD are commands. If it is low, Inputs to LCD are data. The signal which
informs the input or output state to LCD, is required. But this system is not necessary this signal. So "L_WR" signal is
used to write data or commands to LCD. Power signals for LCD are "VBAT and "VDD2".
"SPK_P" and "SPK_N" from OM6357 are used for audio speaker. And "VDD_VIB" from PCF50601 enables the motor.
2-3. IrDA
This system uses IrDA module, HSDL_3208, Agilent's. This has signals, "IrDA_DOWN" (enable signal), "RXD0" (input
data) and "TXD0" (output data). These signals are connected to OM6357. A power signals, "VDD2" is used for circuit
and LED.
2-4. Key
This is consisted of key interface pins among OM6357, KBIO[0~7]. These signals compose the matrix. Result of matrix
informs the key status to key interface in the OM6357. Power on/off key is seperated from the matrix. So power on/off
signal is connected with PCF50601 to enable PCF50601.
Key LED
is consisted of
four white LED for sub key and six white LED for main key. Key LED use the "BLVDD"
supply voltage. Main key LED is controlled by the "VDD_KEY" supply voltage.
"FLIP" informs the status of folder (open or closed) to the OM6357. This uses the hall effect IC, EM-1681-FT.
A magnet under main LCD enables EM-1681-FT.
2-5. EMI ESD Filter
This system uses the EMI ESD filter, EMIF09 to protect noise from IF CONNECTOR part.
2-6. IF connector
It is 18-pin connector. They are designed to use VBAT, +DCVOLT, TXD0, RXD0, RTS0, CTS0, JIG_REC,
CHARGER_OK, RXD1, TXD1 and GND. They connected to power supply IC, microprocessor and signal processor IC.
3. Battery Charge Management
A complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries.
If TA connected to phone, "+DCVOLT" enable charger IC and supply current to battery.
when fault condition caused, "CHG_ON" signal level change low to high and charger IC stop charging process.
4. Audio
EARP_P and EARP_N from OM6357 are connected to the main speaker. AUXSP is connected to the Hands free kit.
MIC_P and MIC_N are connected to the main MIC. And AUX_MIC_P and AUX_MIC_N are connected to the Hands
free kit.