HD404328 Datasheet, PDF (86/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER

HD404328 Series
High Sensitivity Mode (V_CC = 5.0 V, GND = 0.0 V, T_a = 0°C to 70°C, unless otherwise specified)
Item
Symbol Pin
Zero-crossing
V_ZC
detection input
voltage
ZCD
Zero-crossing
V_AZC
detection accuracy
Zero-crossing
f _ZC
detection input
frequency
Min
Typ Max
Unit Test Conditions Note
2.0
— 3.0
V_P-P AC connection,
C = 0.1 µF
—
— ±100
mV f_ZC = 50/60 Hz
Refer to
(sine wave),
figure
48
f_OSC = 4 MHz,
V_CC = 5.0 V
45
— 1000 Hz
1/f _ZC
AC input
V_AZC
V_AZC
V_ZC(P-P)
Internal CPU signal
Note: The internal CPU signal is shown lagging behind the original waveform in the figure, but this is not
fixed—it could actually lead.
Figure 48 Zero-Crossing Detection
84