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Q104
BATDTCT
Changeover circuit for loading
Alkaline = OPEN
Li-ion = CLOSE
SW3
V3SYS
IC104
D104
D105F101 L102
Q109
Q107
Primary Circuit
BATDTCT = OPEN
Q104 ON
IC104 OFF
Load: Min.
BATDTCT = CLOSE
Q104 OFF
IC104 ON
Load: Max.
P5V
VI0
✽
✽
L101
Q106
SHDN
EXT
CS
MAX608 (IC105)
5 V Circuit
DC/DC converter MAX608ESA (IC105) generates +5.11 V and it makes up 5 V system.
VIO : +5 V source for 3-pin jack and LCD power block.
BATDTCT: It distinguishes alkaline and Li-ion to change the load according to the battery. When
alkaline is used, it is H. When Li-ion, it is L.
P5V : Controls ON/OFF of DC-DC converter (IC105). From pin 166 of MB87A915.
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