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參數(shù)資料
| 型號： | MB89W665 |
| 廠商： | Fujitsu Limited |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Proprietary Microcontroller |
| 中文描述： | 8位微控制器專有 |
| 文件頁數(shù)： | 36/48頁 |
| 文件大?。?/td> | 652K |
| 代理商： | MB89W665 |
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MB89660 Series
36
(2) Precautions
Input impedance of analog input pins
The A/D converter used for the MB89660 series contains a sample hold circuit as illustrated below to fetch
analog input voltage into the sample hold capacitor for eight instruction cycles after activating A/D conversion.
For this reason, if the output impedance of the external circuit for the analog input is high, analog input voltage
might not stabilize within the analog input sampling period. Therefore, it is recommended to keep the output
impedance of the external circuit low. If a higher accurancy is required, set the output impedance in this series
to 2 k
or less
.
When the impedance cannot be kept low, the following two methods are recommended. One is to activate the
A/D converter continuously for obtaining the pseudo long sampling time by using software. The other is to
connect the external capacitor of approx. 0.1
μ
s to the analog input pin.
Error
The smaller the | AVR – AV
SS
|, the greater the error would become relatively.
V
OT
V
NT
V
( N+I )T
V
FST
Digital output
(1 LSB
×
N + V
OT
)
0000
0000
0000
0001
1111
1111
1110
1111
1 LSB =
AVR
256
Linearity error = V
NT
(1 LSB
×
N + V
OT
)
1 LSB
Differential linearity error = V
( N + 1 ) T
V
NT
1 LSB
Analog input
Actual conversion value
Theoretical conversion value
1
Total error =
1 LSB
V
NT
(1 LSB
×
N + 1 LSB)
Linearity error
Closes for 8 instruction cycles
after activating A/D conversion.
Sample hold circuit
C
33 pF
Analog channel selector
Analog input pin
R
6 k
Comparator
If the output impedance of
the external circuit is high, it
is recommended to connect
an external capacitor of
approx. 0.1
μ
F.
.
Analog Input Equivalent Circuit
相關PDF資料 |
PDF描述 |
|---|---|
| MB89W665C-SH | 8-bit Proprietary Microcontroller |
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| MB89675ARPFM | Hex Schmitt-trigger Inverters 20-LCCC -55 to 125 |
| MB89675R | Hex Schmitt-trigger Inverters 14-CDIP -55 to 125 |
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