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    參數(shù)資料
    型號: PIC16F1826-I/ML
    廠商: Microchip Technology
    文件頁數(shù): 56/109頁
    文件大?。?/td> 0K
    描述: IC PIC MCU FLASH 2K 28-QFN
    產(chǎn)品培訓(xùn)模塊: XLP Deep Sleep Mode
    8-bit PIC® Microcontroller Portfolio
    特色產(chǎn)品: Extreme Low Power (XLP) Microcontrollers
    標(biāo)準(zhǔn)包裝: 61
    系列: PIC® XLP™ mTouch™ 16F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 32MHz
    連通性: I²C,SPI,UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 16
    程序存儲器容量: 3.5KB(2K x 14)
    程序存儲器類型: 閃存
    EEPROM 大?。?/td> 256 x 8
    RAM 容量: 256 x 8
    電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
    振蕩器型: 內(nèi)部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 28-VQFN 裸露焊盤
    包裝: 托盤
    產(chǎn)品目錄頁面: 655 (CN2011-ZH PDF)
    208
    2570N–AVR–05/11
    ATmega325/3250/645/6450
    23.6.1
    Analog Input Circuitry
    The analog input circuitry for single ended channels is illustrated in Figure 23-8. An analog
    source applied to ADCn is subjected to the pin capacitance and input leakage of that pin, regard-
    less of whether that channel 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 10 k
    Ω or
    less. If such a source is used, the sampling time will be negligible. If a source with higher imped-
    ance 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 recommended to only use low impedant sources
    with slowly varying signals, since this minimizes the required charge transfer to the S/H
    capacitor.
    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 23-8. Analog Input Circuitry
    23.6.2
    Analog Noise Canceling Techniques
    Digital circuitry inside and outside the device generates EMI which might affect the accuracy of
    analog measurements. If conversion accuracy is critical, the noise level can be reduced by
    applying the following techniques:
    1.
    Keep analog signal paths as short as possible. Make sure analog tracks run over the
    analog ground plane, and keep them well away from high-speed switching digital
    tracks.
    2.
    The AVCC pin on the device should be connected to the digital V
    CC supply voltage
    via an LC network as shown in Figure 23-9.
    3.
    Use the ADC noise canceler function to reduce induced noise from the CPU.
    4.
    If any ADC port pins are used as digital outputs, it is essential that these do not
    switch while a conversion is in progress.
    ADCn
    IIH
    1..100 k
    Ω
    CS/H= 14 pF
    VCC/2
    IIL
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