NEC mPD780344 Series User Manual page 263

8-bit single-chip microcontrollers

Table of Contents

CHAPTER 13 10-BIT A/D CONVERTER ( µ PD780354, 780354Y SUBSERIES)

Connect a capacitor to the AV

operation has been stopped and then started, the voltage applied to the AV

causing the accuracy of the A/D conversion to drop. To prevent this, also connect a capacitor to the AV

Figure 13-20 shows an example of connecting capacitors.

Figure 13-20. Example of Connecting Capacitor to AV

Remark C1: 4.7 µ F to 10 µ F (reference value)

pin supplies power to the analog circuit. It also supplies power to the input circuit of ANI0 to ANI7.

Therefore, apply the same potential as that of the V

application where a backup power supply is used.

Main power supply

pins to minimize conversion errors due to noise. If an A/D conversion

C2: 0.01 µ F to 0.1 µ F (reference value)

Connect C2 as close to the pin as possible.

Figure 13-21. Processing of AV

User's Manual U15798EJ2V0UD

pin to this pin, as shown in Figure 13-21, in an

Backup capacitor

pins becomes unstable,