Samsung SGH-X600 Service Manual page 5

SG H- X600 Circuit Description
Modulation Spectrum
2. Baseband Circuit description of SGH-X600
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 cklight Brightne s s Modula tor
T he Ba cklight Brightne s s Modula tor (BBM) contains a progra 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.
This phone (SGH-X600) is not use PWM, but use DC CONTROL (COLOR_LCD_BL)
So "COLOR_LCD_BL" voltage is high value, backlight brightness is bright and "COLOR_LCD_BL" voltage is low value,
backlight is gloomy .
1.3. Cloc k Ge ne rator
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 x te r na l us a ge . T he 32 768 Hz c rys tal
os c illator pr ovide s a n ac curate low c lock fr e que nc y for the PCF506 01 and othe r c ir cuitry.
200kHz offset
30 kHz bandwidth
400kHz offset
30 kHz bandwidth
600kHz ~ 1.8MHz offset
30 kHz bandwidth
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GSM
DCS
PCS
GSM
DCS
PCS
GSM
DCS
PCS
2- 2
-35dBc
-35dBc
-35dBc
-66dBc
-65dBc
-66dBc
-75dBc
-68dBc
-75dBc