LG KU580 Service Manual - Page 76
Control Flow
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3. Technical Brief 3.7.5. Control Flow The access side of the digital baseband controller controls the overall radio system. In both EDGE/GSM/GPRS and W-CDMA air interface mode, the digital baseband controller controls the radio system through a three-wire serial bus. The digital baseband controller also manages PA band control and the antenna switch mechanism in the front end module. The 26 MHz VCXO clock residing in the GSM/EDGE transceiver is turned on only when required, the digital baseband controller initiates this. The EDGE/GSM/GPRS RF system requires control, which is temperature dependent. The temperature within the RF system is estimated by a voltage measurement performed by the analog baseband controller. The control flow for the RF system is shown in Figure 3-7-11. Figure 3-7-11. RF Control Flow Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 77 - LGE Internal Use Only