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10-3.Battery voltage detection
(Pin32)
GND1
(Pin7)
GND2
VCOMP2
(Pin22)
Power Supply Chip
SC371015FU
(Pin6)
VCOMP1
(Pin1)
VDD1
VDD2
(Pin19)
CR-2032 X 2
Main batteries
When CPU receive VCOMP2 detection signal, the machine shows "MAIN POWER SUPPLY
BATTERIES GETTING WEAK! REPLACE!" on the display. And when the batteries voltage is
weak more (approx. 4.53V), as the VCOMP1 detection signal becomes "L". The machine will
operate an auto power off operation.
The power supply IC chip SC371015FU has
(Pin79)
P7
two kind voltage detection circuit in it. Accord-
ing to the batteries input voltage, the detection
(Pin37)
ONMK
outputs V comp1 and V comp2 will change the
C P U
status as follow:
µ
PD3055GF002-2BA
BLI
(Pin27)
Gate Array
µ
PD65005G-452-22
— 19 —
VCOMP2
Batteries Voltage
More than about 4.6V
Less than about 4.6V
VCOMP1
VCOMP1
Batteries Voltage
More than about 4.4V
Less than about 4.4V
VCOMP2
"H"
"L"
"H"
"L"
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