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ZQ~4450M
2. Regulator
(Internal block diagram)
3. Detector
(internal block diagram)
\ VDD.
EO1
- KiB
(Nch open-daqin type)
- GND
1) Caution level (detection voltage: About 4:8 ~ 5.3V) _
¢ When the caution level is detected while displaying, the low battery
symbol ([BATT]) is lighted.
¢ When the caution level is detected on supplying the power to the
set or on pressing the reset switch, the battery replacement indica-
tion (PLEASE REPLACE THE OPERATING
BATTERY }) is dis-
played for about 4 sec.
* When the caution level is detected while sounding the alarm or key
input sound, the alarm sound or key input sound is stopped.
2) Fatal level (Detection voltage: About 4.4 ~ 4.8V)
¢ When the fatal level is detected while displaying, the whole system
is turned off.
|
¢ When the fatal level is detected, on supplying the power to the set
or on pressing the reset switch, the whole system is turned off.
* When the fatal level is detected while sounding the alarm sound or.
key input sound, the alarm sound or key input sound is immedi-
ately stopped. After 100ms, the voltage is restored and the next
process is performed.
¢ When the fatal level is detected while the power is off, pressing the
[ON] key will not supply power to the set. The reset key is also
disabled. (Until the battery is replaced.)
[Note] Since low voltage detection is not performed for the memory
protection battery, please note the battery replacement label
and replace when necessary.
5. Alphabet: Caps/Low
* Caps/Low of alphabet can be selected by pressing the
key.
¢ When the power is supplied by pressing the
| ON]
[ON] key, Caps is
selected. (Caps symbol is lighted.)
@ Circuit
* This circuit has no hysteresis characteristics.
VCC -
OUT
EO1
@ Software
1. Caution level is detected every 0.5sec. (EO1 = GND)
2. In normal cases, only the fatal level is detected. (EO1 = Vcc)
_3. Even when the system is off, the fatal level is detected.
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