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12.
ВЕЗЕТ
& POWER
ON/OFF
DETECTION
CIRCUIT
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م
ن
KI2
CPU
MSM6283-05GS
Power ON/OFF
differential pulse which triggers CPU operation.
By receiving
signal KO9 from ΚΙ1 ~ KI4, ог KI8 terminal, CPU
descriminates the Mode switch position.
Since VA stays at +5V even power switch is turned off or at
the APO (Auto Power Off), the reset signal appears only when
new batteries are set or an AC adaptor is inserted.
(D)
В
The noise killer circuit eliminates negative portion of signal
=
«— CPU reset
MI at Power OFF.
©
5-8053 is a voltage detector which observes VA (+5V).
When
voltage VA becomes less than 2.8V, output pin 1 provides
LOW level to turn 113 on.
Receiving HIGH level from RESET
terminal, CPU stops its functioning.
Voltage down
VA
1: OUT
2: VDD
3.10V
!
3: VSS
2.80%
I
'
1
VDD1
|
ΝΑΙ
1
OUT
Bottom View
5-3
¥001
И
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