m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 163

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.7.5 Connection example of Zero cross detection circuit
2.7.2 Connection example of Zero cross detection circuit
Figure 2.7.5 shows a connection example of the Zero cross detection circuit.
R
case, the AC input is not the effective value of 100 V but is the peak value of 140 V.
R
1
2
is a current limiting resistor. Determine its value according to the current standard of the clamp diode. In this
is a noise elimination resistor. Connect a resistor of about 1 k
Effective value
AC 100 V
Peak value
–140 V
140 V
3819 Group USER’S MANUAL
R
1
2.7 Zero cross detection circuit
R
2
P4
V
V
SS
CC
near the port.
5
3819 group
/INT
1
/ZCR
MITSUBISHI MICROCOMPUTER
3819 Group
149