CHAPTER 11 A/D CONVERTER
User’s Manual U12688EJ4V0UM00
317
Figure 11-1. A/D Converter Block Diagram
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
INTCC110
INTCC111
INTCC112
INTCC113
INTAD
Input circuit
ADM0 (8)
8
Voltage comparator
SAR (10)
ADCR0
ADCR1
ADCR2
ADCR3
ADCR4
ADCR5
ADCR6
ADCR7
10
10
10
9
0
9
0
Internal bus
Tap selector
AV
REF
R/2
R
R/2
AV
DD
Series resistor string
7
0
ADM1 (8)
7
0
AV
SS
8
Edge
detection
Noise
elimination
ADTRG
Controller
Sample & hold circuit
Cautions 1. When noise is generated from the analog input pins (ANI0 to ANI7) and the reference voltage
input pin (AV
REF
), it may cause an illegal conversion result.
In order to avoid this illegal conversion result influencing the system, software processing is
required.
An example of the necessary software processing is as follows.
••••
Use the average value of the A/D conversion results after obtaining several A/D
conversion results.
••••
When an exceptional conversion result is obtained after performing A/D conversion
several times consecutively, omit it and use the rest of the conversion results.
••••
When an A/D conversion result that indicates a system malfunction is obtained, be sure to
recheck the abnormal generation before performing malfunction processing.
2. Make sure not to append the voltage that extends the value between AV
SS
to AV
REF
to the
pins used as A/D converter input pins.
Содержание V850E/MS1 UPD703100
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