Casio PA-2500 Specifications download pdf (Page 38)

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ACDTCTB (to MB87A915)

CHGDTCTB (to MB87A915)

To 3V and V5 circuits.

F100

D100

C105

D101 F101

Q127

D102

Alkaline

(1.6 ~ 3.4 V)

Li-ion

(3.0 ~ 3.6 V)

AC Adapter L100

Primary Circuit

The voltages from both batteries, alkaline and Li-ion, apply to V5 and V3 circuits through the fuse when the

batteries is loaded.

CHGDTCTB is for Li-ion detect. When Li-ion is full charged CHGDTCTB becomes L.

ACDTCTB is for AC adapter detector. It detects whether AC adapter is used or not. When AC adapter is

used ACDTCTB becomes L.

POWER SUPPLY CIRCUIT

The power supply circuit consists of 5 blocks which are Primary circuit, 5 V circuit, 3 V circuit , PCMCIA

power circuit and LCD power circuit as follows;

Alkaline

Li-ion

Fuse

5 V system

3 V system

LCD

AC Adapter

Primary

circuit

To Detector (VSUB)

Lithium

PCMCIA

power circuit

5V circuit

3V circuit

LCD

power circuit

PCMCIA

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Casio PA-2500 Specifications Page 38