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參數(shù)資料
| 型號： | S83C196MH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | SHRINK, QFP-80 |
| 文件頁數(shù)： | 28/41頁 |
| 文件大?。?/td> | 1547K |
| 代理商： | S83C196MH |
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8XC196MH INDUSTRIAL MOTOR CONTROL CHMOS MICROCONTROLLER
34
A/D SAMPLE AND CONVERSION TIMES
Two parameters, sample time and conversion time,
control the time required for an A/D conversion. The
sample time is the length of time that the analog input
voltage is actually connected to the sample capacitor.
If this time is too short, the sample capacitor will not
charge completely. If the sample time is too long, the
input voltage may change and cause conversion
errors. The conversion time is the length of time
required to convert the analog input voltage stored on
the
sample
capacitor
to
a
digital
value.
The
conversion time must be long enough for the
comparator and circuitry to settle and resolve the
voltage. Excessively long conversion times allow the
sample capacitor to discharge, degrading accuracy.
The AD_TIME register programs the A/D sample and
conversion times. Use the T
SAM and TCONV specifica-
values for SAM and CONV; otherwise, erroneous
conversion results may occur.
Use the following formulas to determine the SAM and
CONV values:
where:
SAM = 1 to 7
CONV = 2 to 31
T
SAM is the sample time, in sec
(Tables 16 and 18)
T
CONV is the conversion time, in sec
(Tables 16 and 18)
F
OSC is the XTAL1 frequency, in MHz
B is the number of bits to be converted (8 or 10)
When the SAM and CONV values are known, write
them to the AD_TIME register. Do not write to this
register while a conversion is in progress; the results
are unpredictable.
SAM
T
SAM
F
OSC
2
–
×
8
----------------------------------------
=
CON V
T
CONV
F
OSC
×
3
–
2B
×
-------------------------------------------
1
–
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S83C198 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:COMMERCIAL/EXPRESS CHMOS MICROCONTROLLER |
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| S83C51FA-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| S83C51FA-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| S83C51FA-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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