MB95F264KPF-G-SNE2 Fujitsu, MB95F264KPF-G-SNE2 Datasheet - Page 68

• Manufacturer Part Number: MB95F264KPF-G-SNE2
• Description: MCU, 8BIT, 20K FLASH, 8FX, 20SOP
• Manufacturer: Fujitsu

Specifications of MB95F264KPF-G-SNE2

• No. Of I/o's: 17
• Ram Memory Size: 496Byte
• Cpu Speed: 16.25MHz
• No. Of Timers: 1
• No. Of Pwm Channels: 2
• Core Size: 8bit
• Program Memory Size: 20KB
• Oscillator Type: Internal, External
• Controller Family/series: MB95260H

MB95260H/270H/280H Series
(2) Notes on Using the A/D Converter
• External impedance of analog input and its sampling time
• A/D conversion error
68
• The A/D converter has a sample and hold circuit. If the external impedance is too high to keep sufficient
• Analog input equivalent circuit
• Relationship between external impedance and minimum sampling time
As |V
sampling time, the analog voltage charged to the capacitor of the internal sample and hold circuit is
insufficient, adversely affecting A/D conversion precision. Therefore, to satisfy the A/D conversion precision
standard, considering the relationship between the external impedance and minimum sampling time, either
adjust the register value and operating frequency or decrease the external impedance so that the sampling
time is longer than the minimum value. In addition, if sufficient sampling time cannot be secured, connect
a capacitor of about 0.1 µF to the analog input pin.
CC
−V
100
90
80
70
60
50
40
30
20
10
0
SS
0
| decreases, the A/D conversion error increases proportionately.
[External impedance = 0 kΩ to 100 kΩ]
Note: The values are reference values.
2
Minimum sampling time [μs]
Analog input
(V
CC
4
> 4.5 V)
6
(V
8
CC
> 4.0 V)
10
12
4.5 V < V
4.0 V
R
During sampling: ON
14
<
V
CC
CC
< 5.5 V : R
< 4.5 V : R
C
20
18
16
14
12
10
8
6
4
2
0
0
~ ~
~ ~
[External impedance = 0 kΩ to 20 kΩ]
1.95 kΩ (Max), C
8.98 kΩ (Max), C
Comparator
(V
Minimum sampling time [μs]
CC
> 4.5 V)
1
~ ~
~ ~
17 pF (Max)
17 pF (Max)
2
(V
CC
> 4.0 V)
3
DS07–12627–6E
4