Panasonic KX-TDA0155CE Service Manual

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Panasonic KX-TDA0155CE Service Manual Manual pdf 8 page image

8KX-TDA0155CE4.2.1.6. Power Supply CircuitPAV3.3V, RF2.5V, 3.2V, 1.8V, RF1.8V, 1.5V and 5.25V are generated in CS.5.5V is output of DC/DC Convertor. Other power supplies are made from 5.25V.PAV3.3V and RF2.5V are the power supply for RF block. 3.2V is the power supply for logic circuit.1.5V is used as the power supply of FPGA internal core. 1.8V, RF1.8V is the power supply for BBIC.4.2.1.6.1. Input Filter, Diode BridgeInput filter for noise rejection and diode bridge for misconnection protection.4.2.1.6.2. DC/DC Start Up Control CircuitThis circuit controls the DC/DC converter for prompt return from the power interruption start-up.And when the power supply is low voltage, This circuit controls ON/OFF of the DC/DC converter by DIPSW(SW100)4.2.1.6.3. DC/DC Converter CircuitGenerate 5.25V from DC40V power supply.4.2.1.6.4. Power Back Up CircuitAll power supply is backed up by the electric double layer capacitor.4.2.1.7. Clock CircuitTwo kinds of clock are used in CS.4.2.1.7.1. BBIC Clock10.368MHz crystal oscillator is used.4.2.1.7.2. DPITS I/F GA Clock16.384MHz crystal oscillator is used. It is used for Reference Clock of DPITS I/F GA.4.2.1.8. Reset CircuitIt is reset by the signal from Power on Reset or CPU. The reset from Reset IC(IC105) is reset by CPU, and DPITS I/F GA andFPGA are reset by the port output from CPU.