Pcmcia Circuit - Casio CASSIOPEIA A-20 Service Manual & Parts List

PCMCIA Circuit

DC/DC converter MAX1651 (IC111) generates 3.4 V
VEL : 5.11 V source for LCD unit.
PEL : Controls ON/OFF of VEL. From pin 160 of MB87A915 (IC3).
VPC : 3.4 V or 5.11 V source for detecting PCMCIA power.
PSEL5 : Power supply select signal for PCMCIA (H=5 V, L=3 V).
VCRDIF : 3.4 V or 5.11 V source for MB87A915 (IC3).
PCRD : Controls ON/OFF of VCRDIF, From pin 164 of MB87A915 (IC3).
VCARD : 3.4 V or 5.11 V source for PCMCIA connector.
PCRD2 : Controls ON/OFF of VCARD. From pin 163 of MB87A915 (IC3).
P5DCHG : VCRDIF control signal.
ONSTATUSB : VCRDIF control signal.
P5V : Controls ON/OFF of VPC. From pin 166 of MB87A915 (IC3).
5V Circuit (VIO)
MAX1651(IC111)
Q111
Q114
Q113
R140 Q124
L104
V+
CS
EXT
Q128
— 38 —
Q125
Q116
Q126
Q117
Q120
Q115
D109
Q118
VEL
PEL
VPC
PSEL5
VCRDIF
PCRD
VCARD
PCRD2
P5DCHG
ONSTATUSB
P5V