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5-4.
Detecting Decrease in Voltage
Fig. 5-6. shows a block diagram of the battery voltage monitor circuit. When Pin
@§
[UREG CHK CON] in the system controller
becomes to “H,” the VOLT CHECK (Q801) turns on. This will cause the voltage at both ends of the battery to be divided or halved
in the R801 and R802. And the voltage so halved is input to Pin
2
[UREG MON] in the system controller, thereby detecting a
decrease in voltage. A battery voltage of 0.8V or less will cause the MZ-E30 to be put into the STOP mode, with Message
“LoBATT” blinking on the remote commander display. In approximately 5 seconds, a sleep signal will be output from Pin
!ª
[SLEEP] in the system controller so that the power supply circuit will stop operating. Upon wakeup, meanwhile, Pin
@§
in the system
controller will change from “L” to “H” at the timing shown.
Fig. 5-6. Battery Voltage Monitor Circuit
UREG MON
Q801
VOLT CHECK
R801
47k
R802
47k
2
UREG CHK CON
26
Q802
19
TO DC-DC CONVERTER IC901
30 pin SLEEP
22,50,76
from SERVO DRIVER IC551
, pin VB1
VC
1.5[V]
IC801
SYSTEM CONTROLLER
1
2
1
2
2.8[V](VC)
UREG CHK CON
2.7[V]
8.5[ms]
0
0
VDD
SLEEP
3
2
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