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| 型號(hào)： | MR80C32E-36:D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 36 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁(yè)數(shù)： | 137/336頁(yè) |
| 文件大?。?/td> | 8801K |
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221
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
a.
Make sure the ADATE bit is reset.
b.
Make sure that the ADC is enabled and is not busy converting. Single Conversion mode must be
selected and the ADC conversion complete interrupt must be enabled.
c.
Enter ADC Noise Reduction mode (or Idle mode). The ADC will start a conversion once the CPU has
been halted.
d.
If no other interrupts occur before the ADC conversion completes, the ADC interrupt will wake up the
CPU and execute the ADC Conversion Complete interrupt routine. If another interrupt wakes up the
CPU before the ADC conversion is complete, that interrupt will be executed, and an ADC Conversion
Complete interrupt request will be generated when the ADC conversion completes. The CPU will
remain in active mode until a new sleep command is executed.
Note that the ADC will not be automatically turned off when entering other sleep modes than Idle mode and ADC
Noise Reduction mode. The user is advised to write zero to ADEN before entering such sleep modes to avoid
excessive power consumption.
If the ADC is enabled in such sleep modes and the user wants to perform differential conversions, the user is
advised to switch the ADC off and on after waking up from sleep to prompt an extended conversion to get a valid
result.
21.6.1
Analog input circuitry
The analog input circuitry for single ended channels is illustrated in Figure 21-8 on page 221 An analog source
applied to ADCn is subjected to the pin capacitance and input leakage of that pin, regardless of whether that chan-
nel is selected as input for the ADC. When the channel is selected, the source must drive the S/H capacitor through
the series resistance (combined resistance in the input path).
The ADC is optimized for analog signals with an output impedance of approximately 10k
or less. If such a source
is used, the sampling time will be negligible. If a source with higher impedance is used, the sampling time will
depend on how long time the source needs to charge the S/H capacitor, with can vary widely. The user is recom-
mended to only use low impedance sources with slowly varying signals, since this minimizes the required charge
transfer to the S/H capacitor.
If differential gain channels are used, the input circuitry looks somewhat different, although source impedances of a
few hundred k
or less is recommended.
Signal components higher than the Nyquist frequency (f
ADC/2) should not be present for either kind of channels, to
avoid distortion from unpredictable signal convolution. The user is advised to remove high frequency components
with a low-pass filter before applying the signals as inputs to the ADC.
Figure 21-8. Analog input circuitry.
21.6.2
Analog noise canceling techniques
Digital circuitry inside and outside the device generates EMI which might affect the accuracy of analog measure-
ments. If conversion accuracy is critical, the noise level can be reduced by applying the following techniques:
ADCn
IIH
1..100k
Ω
CS/H= 14pF
VCC/2
IIL
相關(guān)PDF資料 |
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| MR80C52TXXX-16SHXXX:R | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| MQ80C32E-20:R | 8-BIT, 20 MHz, MICROCONTROLLER, CQFP44 |
| MQ80C52CXXX-16:RD | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
| MF280C51C-25R | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP44 |
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相關(guān)代理商/技術(shù)參數(shù) |
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| MR80C51BH | 制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space |
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| MR80C86/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:Microprocessor, 16 Bit, 44 Pin, Ceramic, LCC |
| MR80C86-2 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86-2/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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