Samsung SPH-A900 Service Manual

Also see for SPH-A900: User guide User guide User guide User manual

Contents

Samsung SPH-A900 Service Manual Manual pdf 5 page image

SAMSUNG Proprietary-Contents may change without notice2-1. Logic Section2-1-1. Power SupplyPress "END" key to turn on the phone and then the V_BAT and ON_SW signals will be connected. Thisturns on the inner regulators(V_MSMCORE, V_MSMC, VPD, VPA) of u200(MAX1526).The V_BAT applied to ON_SW will change ON_SW_SENSE signal from HIGH to LOW.MSM6500(UCP102) 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 turnedon/off by the TCXO_CTRL signal. The other regulators(VDD2.6, V_SYNTH, V_RFTX, MOTOR_EN) will bein the ON/OFF state by I 2C-compatible 2 wire serial interface.The regulated Voltage(u200, V_MSMCORE) are used in the core of MSM.The regulated Voltage(u200, V_MSMC) are used in the digital part of MSM.The regulated Voltage(u200, VPD) are used in the digital part and memory of MSM.The regulated Voltage(u200, VPA) is used in the analog part of MSM.The regulated Voltage(u200, V_RFTX) is used in the Tx RF part.The regulated Voltage(u200, V_RFRX) is used in the Rx RF part.The regulated Voltage(u200, V_TCXO) is used in the TCXO.The regulated Voltage(u200, V_SYNTH) is used in the PLL part.The regulated Voltage(u200, VDD2.6) is used in the voltage of camera .The regulated Voltage(u200, MOTOR_EN) is used in the MOTOR.2-1-2. Inner Charging Circuit PartThe most important function of the charger shall be done in the PMIC(Power Management Circuit u200).When the phone with a battery is connected with a travel charging adapter, the inner charging circuit ofthe PMIC(u200) will charge the battery by constant fast charge mode.When battery reaches regulation voltage of 4.2V (default charging voltage for Li+mode), the chargecurrent 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 (800mAh) 2.5 ~ 3 Hrs- Charging Mode : Charging Completion