4-3 Special Circuit Description
4-3-1 Power Circuit
This system is operated under 100Vac or 240Vac. The power circuit supplies the three differential DC voltage
sources.
1) Feed Motor Voltage, TPH Driving Voltage : +24VDC
+24VDC is supplied from SMPS.
This voltage is used as a Step motor driving voltage and a source voltage of the other voltage sources and
TPH Driving Voltage.
2) CPU I/O, NAND FLASH, Etc. Voltage : +3.3VDC
Change the input +24VDC to +3.3VDC by a regulation. U7(A4490EESTR)
3) DDR2 SDRAM Voltage : +1.8VDC
Change the input +24VDC to +1.8VDC by a regulation. U7(A4490EESTR)
4) CPU Core Voltage : +1VDC
Change the input +5VDC to +1VDC by a regulation. U13(EUP3408)
No. VOLTAGE DESCRIPTION
1 VDD_24V (+24VDC) Step Motor Voltage, Thermal Printer Head (TPH) Voltage
2 VDD_3V3 (+3.3VDC) CPU I/O, NAND Flash, LOGIC Etc. Voltage
3 VDD_1V8 (+1.8VDC) CPU, DDR2 SDRAM Voltage
4 VDD_1V (+1VDC) CPU Core Voltage
Ver. 1.01
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