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KX-I-i 200
Z-10.
,.%HAM i_AGI_
UP L;IHL;UII
t) Function
This unit has a lithium battery (BAT[),
which wu_r,s for thu RAIVl (10403) and Real Time Clock IC (R] C,I0408).
The user parameter of autodial numbers, the transmission
ID, the system setup date and so on are stored in the RAM
(IC403).
The RTC (IC408) continues functioning, even when the power switch is OFF, back up by the lithium battery.
2) Oircuit Operation
When the power switch is turned ON, thus supplying the power through the IC409 to the RAM (IC403) and RTC (IC408). At
this time, the voltage at pin 28 of the RAM and pin 8 of the RTC are +5 V. When the power switch is turned OFF, the BATT
supplies the power to the RAM and RTC through the JMP1, R701 and IC409. At the time, the voltage at pin 28 of the RAM
and pin 8 of the RTC are about +2.5 V. When the power switch is OFF and the voltage of +15 V goes down, the Reset IC.
(IC409) outputs the reset signals. Pin 28 of the RAM (IC403) and pin 8 of the RTC (IC408) become low level, then the RAM
and RTC go into the back up mode, when the power consumption
is less.
Circuit Diagram
+5V
S
IC409
VCC o
_
"-----O
VBT
I
I
_I
6
O
4
R701
JMP1
RAM
IC403
RTC
IC408
8--L-- ¢cc
3 -4Bh-
x403
C714 T
_-C715
- 99 -
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