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Reset Circuit
• The power-on reset signal which is input to the #RESET pin changes depending on conditions (power rise
time, components used, board pattern, etc.). Decide the time constant of the capacitor and resistor after enough
tests have been completed with the application product. The #RESET pull-up resistor should be determined in
consideration of the unevenness of the resistor value.
• In order to prevent any occurrences of unnecessary resetting caused by noise during operating, components
such as capacitors and resistors should be connected to the #RESET pin in the shortest line.
Power Supply Circuit
• Sudden power supply variation due to noise may cause malfunction. Consider the following points to prevent
this:
(1) The power supply should be connected to the V
(2) When connecting between the V
short as possible.
Arrangement of Signal Lines
• In order to prevent generation of electromagnetic induction noise caused by mutual inductance, do not arrange
a large current signal line near the circuits that are sensitive to noise such as the oscillator unit.
• When a signal line is parallel with a high-speed line in long distance or intersects a high-speed line, noise may
generated by mutual interference between the signals and it may cause a malfunction.
Do not arrange a high-speed signal line especially near circuits that are sensitive to noise such as the oscillator
unit.
S1C17704 TECHNICAL MANUAL
DD
and V
pins with a bypass capacitor, the pins should be connected as
DD
SS
Bypass capacitor connection example
V
DD
V
SS
Prohibited pattern
Large current signal line
High-speed signal line
EPSON
APPENDIX D PRECAUTIONS ON MOUNTING
and V
pins with patterns as short and large as possible.
SS
V
DD
V
SS
OSC1, OSC3
OSC2, OSC4
V
SS
AP-35
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