參數(shù)資料
型號(hào)： ADUC836BCP
廠商： ANALOG DEVICES INC
元件分類： 微控制器/微處理器
英文描述： MicroConverter, Dual 16-Bit-ADCs with Embedded 62 kB Flash MCU
中文描述： 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, QCC56
封裝： 8 X 8 MM, ROHS COMPLIANT, MO-220-VLLD-2, LFCSP-56
文件頁(yè)數(shù)： 21/80頁(yè)
文件大?。?/td> 5913K
代理商： ADUC836BCP
ADuC836
–21–
SF (Sinc Filter Register)
The number in this register sets the decimation factor and thus
the output update rate for the primary and auxiliary ADCs. This
SFR cannot be written by user software while either ADC is active.
The update rate applies to both primary and auxiliary ADCs and
is calculated as follows:
1
3
8
f
SF
f
ADC
MOD
=
×
×
×
1
where:
f
ADC
= ADC Output Update Rate
f
MOD
= Modulator Clock Frequency = 32.768 kHz
SF
= Decimal Value of SF Register
The allowable range for
SF
is 0DH to FFH. Examples of
SF
values and corresponding conversion update rates (
f
ADC
) and con-
version times (t
ADC
) are shown in Table VIII. The power-on default
value for the SF Register is 45H, resulting in a default ADC update
rate of just under 20 Hz. Both ADC inputs are chopped to mini-
mize offset errors, which means that the settling time for a single
conversion, or the time to a first conversion result in Continuous
Conversion mode, is 2
t
ADC
. As mentioned earlier, all calibra-
tion cycles will be carried out automatically with a maximum, i.e.,
FFH, SF value to ensure optimum calibration performance. Once
a calibration cycle has completed, the value in the SF Register will
be that programmed by user software.
Table VIII. SF SFR Bit Designations
SF(dec) SF(hex) f
ADC
(Hz) t
ADC
(ms)
13 0D 105.3 9.52
69 45 19.79 50.34
255 FF 5.35 186.77
ICON (Current Sources Control Register)
The icon SFR is used to control and configure the various excitation and burnout current source options available on-chip.
SFR Address D5H
Power-On Default Value 00H
Bit Addressable No
Table IX. ICON SFR Bit Designations
Bit Name Description
7 ––– Reserved for Future Use
6 BO Burnout Current Enable Bit.
Set by user to enable both transducer burnout current sources in the primary ADC signal paths.
Cleared by the user to disable both transducer burnout current sources.
5 ADC1IC Auxiliary ADC Current Correction Bit. Set by user to allow scaling of the auxiliary ADC by an internal current
source calibration word.
4 ADC0IC Primary ADC Current Correction Bit.
Set by user to allow scaling of the primary ADC by an internal current source calibration word.
3 I2PIN
*
Current Source-2 Pin Select Bit.
Set by user to enable current source-2 (200
A) to external Pin 3 (P1.2/DAC/IEXC1).
Cleared by user to enable current source-2 (200
A) to external Pin 4 (P1.3/AIN5/IEXC2).
2 I1PIN
*
Current Source-1 Pin Select Bit.
Set by user to enable current source-1 (200
A) to external Pin 4 (P1.3/AIN5/IEXC2).
Cleared by user to enable current source-1 (200
A) to external Pin 3 (P1.2/DAC/IEXC1).
1 I2EN Current Source-2 Enable Bit.
Set by user to turn on excitation current source-2 (200
A).
Cleared by user to turn off excitation current source-2 (200
A).
0 I1EN Current Source-1 Enable Bit.
Set by user to turn on excitation current source-1 (200
A).
Cleared by user to turn off excitation current source-1 (200
A).
*
Both current sources can be enabled to the same external pin, yielding a 400
A current source.
REV. A
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