M30620FCAFP datasheet(608/615 Pages) RENESAS

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Appendix 5

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-291

1.2 Connection of bypass capacitor across Vss line and Vcc line

Connect an approximately 0.1

µF bypass capacitor across the Vss line and the Vcc line as follows:

• Connect a bypass capacitor across the Vss pin and the Vcc pin at equal length.

• Connect a bypass capacitor across the Vss pin and the Vcc pin with the shortest possible wiring.

• Use lines with a larger diameter than other signal lines for Vss line and Vcc line.

• Connect the power source wiring via a bypass capacitor to the Vss pin and the Vcc pin.

Analog

input pin

VSS

Noise

(Note)

Thermistor

Note: The resistor is used for dividing

resistance with a thermistor.

N.G.

O.K.

Microcomputer

Figure 1.2.1. Bypass capacitor across the Vss line and the Vcc line

1.3 Wiring to analog input pins

• Connect an approximately 100

Ω to 1 kΩ resistor to an analog signal line which is connected to an analog

input pin in series. Besides, connect the resistor to the microcomputer as close as possible.

• Connect an approximately 1000 pF capacitor across the Vss pin and the analog input pin. Besides,

connect the capacitor to the Vss pin as close as possible. Also, connect the capacitor across the analog

input pin and the Vss pin at equal length.

q Reason

Signals which is input in an analog input pin (such as an A-D converter/comparator input pin) are usually

output signals from sensor. The sensor which detects a change of event is installed far from the printed

circuit board with a microcomputer, the wiring to an analog input pin is longer necessarily. This long wiring

functions as an antenna which feeds noise into the microcomputer, which causes noise to an analog input

pin.

VSS

VCC

N.G.

O.K.

VSS

VCC

Figure 1.3.1. Analog signal line and a resistor and a capacitor

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