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參數(shù)資料
| 型號： | AS80196CA |
| 廠商： | Intel Corp. |
| 英文描述： | ADVANCED 16-BIT CHMOS MICROCONTROLLER WITH INTEGRATED CAN 2.0 |
| 中文描述： | 先進的16位單片機CHMOS集成CAN 2.0 |
| 文件頁數(shù)： | 28/33頁 |
| 文件大小： | 453K |
| 代理商： | AS80196CA |
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87C196CA/87C196CB
WAVEFORMDSERIAL PORTDSHIFT REGISTER MODE
SERIAL PORT WAVEFORMDSHIFT REGISTER MODE
272405–29
A TO D CHARACTERISTICS
The sample and conversion time of the A/D convert-
er in the 8-bit or 10-bit modes is programmed by
loading a byte into the ADDTIME Special Function
Register. This allows optimizing the A/D operation
for specific applications. The ADDTIME register is
functional for all possible values, but the accuracy of
the A/D converter is only guaranteed for the times
specified in the operating conditions table.
The value loaded into ADDTIME bits 5, 6, 7 deter-
mines the sample time, SAMP. The value loaded
into ADDTIME bits 0, 1, 2, 3 and 4 determines the
bit conversion time, CONV. These bits, as well as
the equation for calculating the total conversion
time, T, are shown in the following table:
ADDTIME
1FAFH:Byte
3
7
6
4
2
1
0
Sample Time
Bit Conversion Time
(SAMP)
(CONV)
4n
a
1 state times
n
e
1 to 7
Equation:
T
e
total conversion time (states)
B
e
number of bits conversion (8 or 10)
n
e
programmed register value
n
a
1 state times
n
e
2 to 31
T
e
(SAMP)
a
Bx (CONV)
a
2.5
The converter is ratiometric, so absolute accuracy is
dependent on the accuracy and stability of V
REF
.
V
REF
must be close to V
CC
since it supplies both the
resistor ladder and the analog portion of the convert-
er and input port pins. There is also an ADDTEST
SFR that allows for conversion on ANGND and
V
REF
as well as adjusting the zero offset. The abso-
lute error listed is without doing any adjustments.
A/D CONVERTER SPECIFICATION
The specifications given assume adherence to the
operating conditions section of this data sheet. Test-
ing is performed with V
REF
e
5.12V and 20 MHz
operating frequency. After a conversion is started,
the device is placed in IDLE mode until the conver-
sion is complete.
28
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