Casio PA-2500 Specifications download pdf (Page 40)

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Q110

Q112

Q123

CR2032

Q122

VIN EXT

VOUT

IC108

D103

L103

Q108

SHDN EXT

V+

MAX608 (IC106)

Primary Circuit

V3SYS

V3MAIN

V3AUD

V3RAM

VSUB

V3ROM (To ROM)

ONSTATUSB

OFF: H

ON: L

V3IRDA

(To IrDA)

PIRB

(Normally H)

3.4 V Regulator

PDMMYM

(Normally L)

DC-DC converter

3 V Circuit

DC/DC converter MAX608ESA (IC106) generates +3.77 V and it makes up 3 V system.

V3MAIN : The reference voltage for the detector.

V3SYS : +3.4 V source for IC1,IC3,IC5.

V3RAM : +3.4 V source for DRAM (RAM5 ~ RAM8).

V3ROM : +3.4 V source for ROM (U301,U302).

ONSTATUSB : Controls ON/OFF of V3ROM. From pin 99 of CPU.

V3IRDA : +3.4 V source for IrDA Transceiver CIM-10S (IC4).

PIRB : Controls ON/OFF of V3IRDA. From pin 75 of MB87A915 (IC3).

VSUB : +2.7 V source for detecting memory backup battery.

V3AUD : +3.4 V source for MB87A195 (IC3).

PDMMYM : Controls ON/OFF of the load at detecting voltage.

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Casio PA-2500 Specifications Page 40

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