Samsung SGH-X600 Service Manual page 6

2 . S G H - X 6 0 0 C i r c u i t
2. Connector
2-1. LCD Connector
LCD is consisted of LCD(color 65K STN LCD). Chip select signals in the U500, LCD_CS can enable LCD. This signal
is from IO part of the DSP in the U500(alpha chip). "RESET_2.8V" 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_WD" signal is
used to write data or commands to LCD. Power signal for LCD is "VDD2".
2-2. 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. It uses two power signals. "VDD2" is used for
circuit and "VBAT" is used for LED.
2-3. 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 separated from the matrix. So power on/off
signal is connected with PCF50601 to enable PCF50601. Ten key LEDs use the "BLVDD" supply voltage.
"COLOR_LCD_BL" signal enables LEDs with current control.
2-4. EMI ESD Filter
This system uses the EMI ESD filter, EMIF09 to protect noise from IF CONNECTOR part.
2-5 IF connetor
It is 18-pin connector. They are designed to use VBAT, V_EXT_CHARGE, TXD0, RXD0, RTS0, CTS0, JIG_REC,
CHARGER_OK, RXD1, TXD1, AUX_MIC, AUX_SPK 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, "V_EXT_CHARGE" 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 receiver. 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.
YMU762C 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, YMU762C is equipped 32 voices with different tones. 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.
D e s c r i p t i o n
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2- 3