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2. Circuit Description
2-1. Logic Section
2-1-1. Power Supply
Press "END" key to turn on the phone and then the VBATT and ON_SW signals will be connected. This
turns on the inner regulators(V_MSMCORE, V_MSMC, VPD, VPA) of U203(MAX1526).
The VBATT applied to ON_SW will change ON_SW_SENSE signal from HIGH to LOW.
MSM6500(U101) sends out PS_HOLD(logical HIGH) to keep the inner regulators on even after the "END"
key is released. V_RFRX can be turned on/off by the RX_CTRL signal. V_TCXO can be turned on/off
by the TCXO_CTRL signal. The other regulators(2.85VDD, V_SYNTH, V_RFTX, V_MOTOR, V_LED) will
be in the ON/OFF state by I
The regulated Voltage(U203, V_MSMCORE) are used in the core of MSM.
The regulated Voltage(U203, V_MSMC) are used in the digital part of MSM.
The regulated Voltage(U203, VPD) are used in the digital part MSM.
The regulated Voltage(U203, VPA) is used in the analog part of MSM.
The regulated Voltage(U203, V_RFTX) is used in the Tx RF part.
The regulated Voltage(U203, V_RFRX) is used in the Rx RF part.
The regulated Voltage(U203, V_TCXO) is used in the TCXO.
The regulated Voltage(U203, V_SYNTH) is used in the PLL part.
The regulated Voltage(U203, 2.85VDD) is used in the Camera Display part and the T-Flash.
The regulated Voltage(U203, V_MOTOR) is used in the MOTOR.
The regulated Voltage(U203, V_LED) is used in the KEYPAD LED.
2-1-2. Inner Charging Circuit Part
The most important function of the charger shall be done in the PMIC(Power Management Circuit U203).
When the phone with a battery is connected with a travel charging adapter, the inner charging circuit of
the PMIC(U203) will charge the battery by constant fast charge mode.
When battery reaches regulation voltage of 4.2V (default charging voltage for Li+mode), the charge
current drops quickly to 0mA
- Input voltage range : 4.25 ∼ 6.5V
- Charging Temperature : 0°C ∼ 40°C
- Charging Method : Constant Voltage/Current -Charging Current : Normal 550mA
- Charging Time : Standard (1100mAh) 2.5 ~ 3 Hrs , Extended (1700mAh) 3.5 ~ 4 Hrs
- Charging Mode : ① Charging ② Completion
2
C-compatible 2 wire serial interface.
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2-1
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