Casio CASSIOPEIA A-20 User Manual

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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

Casio CASSIOPEIA A-20 Specifications

General

Brand	Casio
Model	CASSIOPEIA A-20
Category	Handhelds
Language	English