Samsung SGH-E330 Service Manual page 6

Circuit Description
2. Baseband Circuit description of SGH-E330
1. PCF50601
1.1. Power Management
Ten low-dropout regulators designed specifically for GSM applications power the terminal and help ensure optimal system
performance and long battery life. A programmable boost converter provides support for 1.8V, 3.0V, and 5.0V SIMs,
while a self-resetting, electronically fused switch supplies power to external accessories. Ancillary support functions, such
as RTC module and High Voltage Charge pump, Clock generator, aid in reducing both board area and system complexity.
I2C BUS serial interface provides access to control and configuration registers. This interface gives a microprocessor full
control of the PCF50601 and enables system designers to maximize both standby and talk times.
Supervisory functions. including a reset generator, an input voltage monitor, and a temperature sensor, support reliable
system design. These functions work together to ensure proper system behavior during start-up or in the event of a fault
condition(low microprocessor voltage, insufficient battery energy, or excessive die temperature).
1.2. Ba c klight Br ightne s s Modulator
T he Bac klight Br ightne s s Modula tor (BBM) c onta ins a pr ogr a mma ble Puls e - width modulator (PWM) and FET
to modulate the intensity of a series of LED's or to control a DC/DC converter that drives LCD backlight.
But, this phone (SGH-E330) is use UFB LCD. UFB LCD controls backlight brightness by contrast setting.
So "BL_VDD" voltage is always high value when phone is in active mode. When phone is in dimming mode "BL_VDD"
goes to about 10% duty PWM.
1.3. Cloc k Ge ne r a tor
T he Cloc k Ge ne r ator (CG) ge ne ra te s a ll c locks for inte r na l a nd e xte r na l us age . T he 32768 Hz c r ys ta l
os cilla tor pr ovide s a n a c c ur a te low c lock fr e que nc y for the PCF50601 a nd othe r c ir cuitr y.
2. LCD Connector
LCD is consisted of main LCD(color 65K UFB LCD) and sub LCD(color 65K UFB LCD).
Chip select signals LCD_MAIN_CS and LCD_SUB_CS, can enable Each LCD. BACKLIGHT signal enables white LED
of main LCD. "RESET_2V8" signal initiates the reset process of the LCD.
16-bit data lines(LD(0)~LD(15)) transfers data and commands to LCD through bypass 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 state of LCD is whether input or output, is required. But in this system, there is no input
state from LCD. So only "L_WR" signal is used to indicate write data or command to LCD. Power signals for LCD are
"VBAT and "VDD2".
"M_SCL", "M_SCA", "PCLK", "FVALID", "LVALID" and "STANDBY" signals are all related to camera working.
"CAMERA_FLASH_SUPPLY" is voltage supply to flash led , and "SVC_LED" is signal for service led when the signal
is low led is on and vice versa. "SPK_P" and "SPK_N" are used for audio speaker containing voice or melody. And
"VDD_VIB" from PCF50601 enables the motor.
3. Key
This is consisted of key interface pins among OM6359, KBIO(0:7). These signals compose the matrix. Result of matrix
informs the key status to key interface in the OM6359. Power on/off key is separated from the matrix. So power on/off
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