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| 型号： | EVAL-ADUC834QSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/80页 |
| 文件大小： | 0K |
| 描述： | KIT DEV QUICK START ADUC834 |
| 标准包装： | 1 |
| 系列： | QuickStart™ 套件 |
| 类型： | MCU |
| 适用于相关产品： | ADuC834 |
| 所含物品： | 评估板，线缆，电源，软件和文档 |
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REV. A
ADuC834
–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:
f
SF
f
ADC
MOD
=×
×
1
3
1
8
Where:
fADC = ADC Output Update Rate
fMOD = 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 (fADC) and conversion
times (tADC) 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 minimize 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
tADC. As mentioned earlier,
all calibration 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)
fADC(Hz)
tADC(ms)
13
0D
105.3
9.52
69
45
19.79
50.34
255
FF
5.35
186.77
ICON (Current Sources Control Register)
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
6BOBurnout Current Enable Bit.
Set by user to enable both transducer burnout current sources in the primary ADC signal paths.
Cleared by 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.
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| EVAL-ADUC841QSPZ | 功能描述:KIT DEV QUICK START ADUC841 RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 标准包装:1 系列:PICDEM™ 类型:MCU 适用于相关产品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，线缆，元件，CD，PICkit 编程器 产品目录页面:659 (CN2011-ZH PDF) |
| EVAL-ADUC841QSPZ | 制造商:Analog Devices 功能描述:Silicon Manufacturer:Analog Devices C |
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