Samsung SGH-C210 service manual, samsung service manuals schematy serwisowki
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1-1. GSM General Specification
E G S M 9 0 0
P h a s e 2
D C S 1 8 0 0
P h a s e 1
P C S 1 9 0 0
P h a s e 1
F r e q . B a n d [ M H z ]
U p l i n k / D o w n l i n k
8 8 0 ~ 9 1 5
9 2 5 ~ 9 6 0
1 7 1 0 ~ 1 7 8 5
1 8 0 5 ~ 1 8 8 0
1 8 5 0 ~ 1 9 1 0
1 9 3 0 ~ 1 9 6 0
A R F C N r a n g e
0 ~ 1 2 4 & 9 7 5 ~ 1 0 2 3
5 1 2 ~ 8 8 5
5 1 2 ~ 8 1 0
T x / R x s p a c i n g
4 5 M H z
9 5 M H z
8 0 M H z
M o d . B i t r a t e /
B i t P e r i o d
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
T i m e S l o t
P e r i o d / F r a m e P e r i o d
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
M o d u l a t i o n
0 . 3 G M S K
0 . 3 G M S K
0 . 3 G M S K
M S P o w e r
3 3 d B m ~ 5 d B m
3 0 d B m ~ 0 d B m
3 0 d B m ~ 0 d B m
P o w e r C l a s s
5 p c l ~ 1 9 p c l
0pcl ~ 15pcl
0pcl ~ 15pcl
S e n s i t i v i t y
- 1 0 2 d B m
- 1 0 0 d B m
- 1 0 0 d B m
T D M A M u x
8
8
8
C e l l R a d i u s
3 5 K m
2 K m
2 K m
O p e r a t i n g
T e m p e r a t u r e
- 2 0 °C ~ + 5 0 °C
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2-1. SGH-C210 RF Circuit Description
2-1-1. RX PART
ꆪ
ASM(F101)
ꇦ
Switching Tx, Rx path for GSM900, DCS1800 and PCS1900 by logic controlling.
ꆪ
ASM Control Logic Truth Table
VC1
VC2
VC3
EGSM TX
H
L
L
DCS/PCS TX
L
H
L
PCS_RX
L
L
H
ꆪ
Saw FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.
- GSM FILTER (F100)
ꇦ
For filtering the frequency band between 925 and 960 MHz.
- DCS FILTER (F100)
ꇦ
For filtering the frequency band between 1805 and 1880 MHz
- PCS FILTER (F102)
ꇦ
For filtering the frequency band between 1930 and 1990 MHz.
ꆪ
Crystal (X101)
To generate the 26MHz reference clock to drive the logic and RF.
After additional process, the reference clock applies to the U801 Rx IQ demodulator and Tx IQ modulator.
The oscillator for RX IQ demodulator and Tx modulator are controlled by serial data to select channel and use fast lock
mode for GPRS high class operation.
ꆪ
Si4210 (U102)
The receive section integrates four differential-input low noise amplifiers LNAs supporting the GSM850, EGSM900,
DCS1800 and PCS1900 bands. The LNA inputs are matched to the 150 ohm balanced-output SAW filters through externa
LC matching network.
A quadrature Image-reject mixer downconverts the RF signal to a 200 KHz intermediate frequency(IF). The mixer output is
amplified with an analog programmable gain amplifier(PGA) that is controlled with the AGAIN. The quadrature IF
is digitized with high resolution analog-to-digital converts (ADC).
The ADC output is downconverted to baseband with a digital quadrature LO signal. Digital decimation and FIR filters
perform digital filtering and remove ADC quantization noise, blockers and reference interferers.
After filtering, the digital output is scaled with a digital PGA, which is controlled with the DGAIN. DACs drive a
differential I and Q analog signal onto the BIP, BIN, BQP and BQN pins to interface to standard analog-input baseband
ICs.
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2-1-2. TX PART
Baseband IQ signal fed into offset PLL, this function is included inside of U801 chip. The transmit section of U801
consist of an I/Q baseband upconverter, an offset phase-locked loop (OPLL) and two 50 ohm output buffers that can drive
an external Power Amplifier(PA). Si4210 chip generates modulator signal which power level is about 1.5dBm and fed into
Power Amplifier(U900). The PA output power and power ramping are well controlled by Auto Power Control circuit.
We use offset PLL below.
GSM
-35dBc
200kHz offset
30 kHz bandwidth
DCS
-35dBc
PCS
-35dBc
GSM
-66dBc
400kHz offset
30 kHz bandwidth
Modulation Spectrum
DCS
-65dBc
PCS
-66dBc
GSM
-75dBc
600kHz ~ 1.8MHz offset
30 kHz bandwidth
DCS
-68dBc
PCS
-75dBc
2-2. Baseband Circuit description of SGH-C210
2-2-1. CSP2200B1
ꆪ Power Management
Seven low-dropout regulators designed specifically for GSM applications power the terminal and help ensure optimal
system performance and long battery life. A programmable LDO provides support for 1.8V, 3.0V SIMs, while a self-
resetting, electronically fused switch supplies power to external accessories. Ancillary support functions, such as two LED
drivers and two call-alert drivers, aid in reducing both board area and system complexity. A four-wire serial interface
unit(SIU) provides access to control and configuration registers. This interface gives a microprocessor full control of the
CSP2200B1 and enables system designers to maximize both standby and talk times. Error reporting is provided via an
interrupt signal and status register. Supervisory functions. including a reset generator, an input voltage monitor, and a
thermal monitor, 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).
ꆪ Battery Charge Management
A battery charge management block, incorporating an internal PMOS switch, and an 8-bit ADC, provides fast, efficient
charging of single-cell Li-Ion battery. Used in conjunction with a current-limited voltage source, this block safely
conditions near-dead cells and provides the option of having fast-charge and top-off controlled internally or by the system's
microprocessor.
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ꆪ Backlight LED Driver
The backlight LED driver is a low-side, programmable current source designed to control the brightness of the keyboard
illumination. LED1_DRV is controlled via LED1_[0:2] and can be programmed to sink from 15mA to 60mA in 7.5mA
steps. LED2_DRV is controlled via LED2_[0:2] and can be programmed to sink from 5mA to 40mA in 5mA steps.
Both LED drivers are capable of sinking their maximum output current at a worst-case maximum output voltage of 0.6V.
For efficient use, the LEDs is connected between the battery and the LED_DRV output.
ꆪ Vibrator Motor Driver
The vibrator motor driver is a independent voltage regulator to drive a small dc motor that silently alerts the user of an
incoming call. The driver is a 3.3V constant source while sinking up to 140mA and controlled by enable signal of main
chip. For efficient use and safety, the vibrator motor should be connected between the regulator output and the ground.
2-2-2. Connector
ꆪ JTAG Connector
Trident has two JTAG ports which are for ARM core and DSP core(DSP16000). So this system has two port connector
for these ports. Pins' initials for ARM core are 'CP_' and pins' initials for DSP core are 'DSP_'.
CP_TDI and DSP_TDI signal are used for input of data. CP_TDO and DSP_TDO signals are used for the output of the
data. CP_TCK and DSP_TCK signals are used for clock because JTAG communication is a synchronous. CP_TMS and
DSP_TMS signals are test mode signals. The difference between these is the RESET_INT signal which is for ARM core
RESET.
ꆪ Keypad connector
This is consisted of key interface pins in the trident, KEY_ROW[0~4] and KEY_COL[0~4]. These signals compose the
matrix. Result of matrix informs the key status to key interface in the trident. Some pins are connected to varistor for
ESD protection. And power on/off key is seperated from the matrix.
So power on/off signal is connected with CSP2200 to enable CSP2200.
Nine key LED use the +VBATT supply voltage. These are connected to BACKLIGHT signal in the CSP2200.
This signal enables LEDs with current control.
ꆪ EMI Filtering
This system uses the EMI Filter to reduce noise from LCD part. Some control signals are connected to LCD without EMI
filtering.
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