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INPUT FILTER, DIODE BRIDGE
Input filter for noise rejection and diode bridge for misconnection protection.
DC/DC START UP CONTROL CIRCUIT
This circuit control start up of DC/DC converter IC for the quick recovery from power
interruption.
DC/DC CONVERTER CIRCUIT
Generate 5.0V from DC40V power supply.
POWER BACK UP CIRCUIT
All power supply is back- upped by the primary electrolyte capacitor and secondary super
capacitor.
12.7. CLOCK CIRCUIT
Three kinds of clock is used in CS.
CPU CLOCK
CPU clock and FPGA clock is used 9.6MHz divided cycle of 19.2MHz TCXO.
BBIC CLOCK
10.368MHz VCXO is used. Tweak frequency by changing the variable capacitance diode by DA
signal from CPU.
DNIC CLOCK
10.24MHz crystal oscillator is used. It is used for Reference Clock of DNIC.
12.8. RESET CIRCUIT
It is reset by the signal from Power on Reset or CPU. The reset from Reset IC is reset by CPU or
F-ROM, BBIC and HDLC is reset by the Port output from CPU.
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