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SGH-E700 Circuit Description
2-
2
Modulation Spectrum
200kHz offset
30 kHz bandwidth
GSM
-35dBc
DCS
-35dBc
PCS
-35dBc
400kHz offset
30 kHz bandwidth
GSM
-66dBc
DCS
-65dBc
PCS
-66dBc
600kHz ~ 1.8MHz offset
30 kHz bandwidth
GSM
-75dBc
DCS
-68dBc
PCS
-75dBc
2. Baseband Circuit description of SGH-E700
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.
Backlight Brightness Modulator
The Backlight Brightness Modulator (BBM) contains a programmable Pulse-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-E700) is not use PWM, but use DC CONTROL (BL_VDD)
So "BL_VDD" voltage is high value, backlight brigtness is gloomy and "BL_VDD" voltage is low value, backlight is
bright.
1.3.
Clock Generato
r
The Clock Generator (CG) generates all clocks for internal and external usage. The 32768 Hz crystal
oscillator provides an accurate low clock frequency for the PCF50601 and other circuitry.
2. Connector
2-1. LCD Connector
LCD is consisted of main LCD(color 65K TFT LCD) and small LCD(256 EL LCD). Chip select signals in the
U302
,
LCD_MAIN_CS and LCD_SUB_CS, can enable Each LCD. LCD_MAIN_CS signal enables white LED of main LCD and
LCD_SUB_CS signal enables EL of small LCD. These two signals are from IO part of the DSP in the U302(alpha chip).
