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Touch Control Circuit Descriptions
2. Power Initializing Circuit (Reset)
Initializes the microcomputers 73C81 (IC1) automatically.
Figure 41 shows the schematic configuration
Figure 42 shows the voltage waveforms upon applying power.
TO PIN 2
OF IC1
(Fig. 41) Power Initializing Circuit (Power Up Reset Delay Circuit)
POWER
POWER
OFF
ON
turn on
OV
Waveform
of (A)
VCC
(- SY)
Waveform
of (B)
(~ SV)
ZD4
turn off
(Fig. 42) Voltage Waveform upon Applying Power
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