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  • 參數(shù)資料
    型號: PIC24F08KL401-I/P
    廠商: Microchip Technology
    文件頁數(shù): 135/260頁
    文件大?。?/td> 0K
    描述: IC MCU 16BIT 8KB FLASH 20-PDIP
    產(chǎn)品培訓(xùn)模塊: Low Cost PIC24F KL Family Overview
    標(biāo)準(zhǔn)包裝: 22
    系列: PIC® XLP™ 24F
    核心處理器: PIC
    芯體尺寸: 16-位
    速度: 32MHz
    連通性: I²C,IrDA,LIN,SPI,UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,HLVD,POR,PWM,WDT
    輸入/輸出數(shù): 18
    程序存儲器容量: 8KB(2.75K x 24)
    程序存儲器類型: 閃存
    EEPROM 大小: 512 x 8
    RAM 容量: 1K x 8
    電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 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: 20-DIP(0.300",7.62mm)
    包裝: 管件
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    PIC24F16KL402 FAMILY
    DS31037B-page 22
    2011 Microchip Technology Inc.
    2.2
    Power Supply Pins
    2.2.1
    DECOUPLING CAPACITORS
    The use of decoupling capacitors on every pair of
    power supply pins, such as VDD, VSS, AVDD and
    AVSS, is required.
    Consider the following criteria when using decoupling
    capacitors:
    Value and type of capacitor: A 0.1
    F (100 nF),
    10-20V capacitor is recommended. The capacitor
    should be a low-ESR device, with a resonance
    frequency in the range of 200 MHz and higher.
    Ceramic capacitors are recommended.
    Placement on the printed circuit board: The
    decoupling capacitors should be placed as close
    to the pins as possible. It is recommended to
    place the capacitors on the same side of the
    board as the device. If space is constricted, the
    capacitor can be placed on another layer on the
    PCB using a via; however, ensure that the trace
    length from the pin to the capacitor is no greater
    than 0.25 inch (6 mm).
    Handling high-frequency noise: If the board is
    experiencing high-frequency noise (upward of
    tens of MHz), add a second ceramic type capaci-
    tor in parallel to the above described decoupling
    capacitor. The value of the second capacitor can
    be in the range of 0.01
    F to 0.001 F. Place this
    second capacitor next to each primary decoupling
    capacitor. In high-speed circuit designs, consider
    implementing a decade pair of capacitances as
    close to the power and ground pins as possible
    (e.g., 0.1
    F in parallel with 0.001 F).
    Maximizing performance: On the board layout
    from the power supply circuit, run the power and
    return traces to the decoupling capacitors first,
    and then to the device pins. This ensures that the
    decoupling capacitors are first in the power chain.
    Equally important is to keep the trace length
    between the capacitor and the power pins to a
    minimum, thereby reducing PCB trace
    inductance.
    2.2.2
    TANK CAPACITORS
    On boards with power traces running longer than
    six inches in length, it is suggested to use a tank capac-
    itor for integrated circuits, including microcontrollers, to
    supply a local power source. The value of the tank
    capacitor should be determined based on the trace
    resistance that connects the power supply source to
    the device, and the maximum current drawn by the
    device in the application. In other words, select the tank
    capacitor so that it meets the acceptable voltage sag at
    the device. Typical values range from 4.7
    F to 47 F.
    2.3
    Master Clear (MCLR) Pin
    The MCLR pin provides two specific device
    functions: Device Reset, and Device Programming
    and Debugging. If programming and debugging are
    not required in the end application, a direct
    connection to VDD may be all that is required. The
    addition of other components, to help increase the
    application’s resistance to spurious Resets from
    voltage
    sags,
    may
    be
    beneficial.
    A
    typical
    configuration is shown in Figure 2-1. Other circuit
    designs may be implemented, depending on the
    application’s requirements.
    During programming and debugging, the resistance
    and capacitance that can be added to the pin must
    be considered. Device programmers and debuggers
    drive the MCLR pin. Consequently, specific voltage
    levels (VIH and VIL) and fast signal transitions must
    not be adversely affected. Therefore, specific values
    of R1 and C1 will need to be adjusted based on the
    application and PCB requirements. For example, it is
    recommended that the capacitor, C1, be isolated
    from the MCLR pin during programming and
    debugging operations by using a jumper (Figure 2-2).
    The
    jumper
    is
    replaced
    for
    normal
    run-time
    operations.
    Any components associated with the MCLR pin
    should be placed within 0.25 inch (6 mm) of the pin.
    FIGURE 2-2:
    EXAMPLE OF MCLR PIN
    CONNECTIONS
    Note 1:
    R1
    10 k is recommended. A suggested
    starting value is 10 k
    . Ensure that the
    MCLR pin VIH and VIL specifications are met.
    2:
    R2
    470 will limit any current flowing into
    MCLR from the external capacitor, C, in the
    event of MCLR pin breakdown, due to
    Electrostatic Discharge (ESD) or Electrical
    Overstress (EOS). Ensure that the MCLR pin
    VIH and VIL specifications are met.
    C1
    R2
    R1
    VDD
    MCLR
    PIC24FXXKXX
    JP
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