Circuit Description - Samsung SCH-i830 Service Manual

2. Circuit Description

2-1. Logic Section
2-1-1. Power Supply
For the POWER ON, the PHONE_ON pulse signal for 1 second from PDA turns on U900 (PM6650)
The pin 29, 33, 35, 41, 52, 54, 65, 71, 83 of U900(PM6650) are the inputs of all r
phone. Simultaneously, MSM sends out PS_HOLD(logical HIGH) to turn on the p in 57 of
U900(PM6650) even after the PHONE_ON signal is released. For the POWER OFF, by pressing
POWER KEY of the phone application, the MSM output LOW on the PS_HOLD.
The regulated voltage(U900,VREG_MSMC, VRGE_MSME, VREG_MSMP ) is used in the digital part
of MSM
The regulated voltage(U900,VREG_MSMA) is used in the analog part of MSM.
The regulated volgtage(U900, VREG_RFTX) is used in the TX RF
The regulated voltage(U900,VREG_RFRX) is used in the Rx RF part.
The regulated voltage(U900,VREG_TCXO) is used in the TCXO
The regulated Voltage(U900,VREG_SYNTH) is used in the PLL part.
2-1-2. Logic Part
The logic part consists of internal CPU of MSM, Memory.
MOBILE SYSTEM MODEM(UCP800:MSM6500)
Industry standard ARM926EJ-S microprocessor is embedded. The MSM6500 chipset integrates
CDMA2000 1x and 1xEVDO service. The 1xEVDO solution can support High-speed peak data rates of
2.4Mbps on forward link and 153kbps on reverse link.
The MSM6500 device is offered in a 409 ball, 0.5mm pitch, CSP production package. Subsystems within
the MSM6500 device include a CDMA processor, a QDSP for voice compression, an ARM9TDMI
microprocessor. Also integrated in the MSM6500 device are analog functions such as an audio voice
codec, PLL, transmit DAC
clock. It is one of the most important components of the CDMA cellular phone.
The interface circuitry consists of reset circuit, dual address/data bus and memory controls. The TCXO
clock of 19.2Mhz is used as the clock of SCH-i830 model.
MCP : FLASH ROM and SDRAM (UME802:K5D5657DCM)
MCP is consist of 256Mbit NAND FALSH and 256Mbit SDRAM. MCP is used to store the cellular
phone's executable program ,necessary data files and temporary data space and efs area is used to
store ESN, NAM information, telephone directory, SMS messages and other important information of the
phone. MCP is also used to execute the DMSS(Dual Mode Subscriber system) software.
, ADC , memories, USB controller, peripheral interfaces, and an enhanced
S S
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2-1
egulators on the