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  • 參數(shù)資料
    型號(hào): PIC16C62BT-20I/ML
    廠商: Microchip Technology
    文件頁(yè)數(shù): 70/120頁(yè)
    文件大?。?/td> 0K
    描述: IC MCU OTP 2KX14 28-QFN
    標(biāo)準(zhǔn)包裝: 1,600
    系列: PIC® 16C
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: I²C,SPI
    外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 22
    程序存儲(chǔ)器容量: 3.5KB(2K x 14)
    程序存儲(chǔ)器類型: OTP
    RAM 容量: 128 x 8
    電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
    振蕩器型: 外部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 28-VQFN 裸露焊盤
    包裝: 帶卷 (TR)
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    PIC16C62B/72A
    1999 Microchip Technology Inc.
    Preliminary
    DS35008B-page 53
    9.2
    Selecting the A/D Conversion Clock
    The A/D conversion time per bit is defined as TAD. The
    A/D conversion requires 9.5TAD per 8-bit conversion.
    The source of the A/D conversion clock is software
    selectable. The four possible options for TAD are:
    2TOSC
    8TOSC
    32TOSC
    Internal RC oscillator
    For correct A/D conversions, the A/D conversion clock
    (TAD) must be selected to ensure a minimum TAD time
    of 1.6
    s.
    The A/D module can operate during sleep mode, but
    the RC oscillator must be selected as the A/D clock
    source prior to the SLEEP instruction.
    Table 9-1 shows the resultant TAD times derived from
    the device operating frequencies and the A/D clock
    source selected.
    9.3
    Configuring Analog Port Pins
    The ADCON1 and TRISA registers control the opera-
    tion of the A/D port pins. The port pins that are desired
    as analog inputs must have their corresponding TRIS
    bits set (input). If the TRIS bit is cleared (output), the
    digital output level (VOH or VOL) will be converted.
    The A/D operation is independent of the state of the
    CHS2:CHS0 bits and the TRIS bits.
    TABLE 9-1
    TAD vs. DEVICE OPERATING FREQUENCIES
    Note 1: When reading the port register, all pins
    configured as analog input channels will
    read as cleared (a low level). Pins config-
    ured as digital inputs, will convert an ana-
    log input. Analog levels on a digitally
    configured input will not affect the conver-
    sion accuracy.
    Note 2: Analog levels on any pin that is defined as
    a digital input (including the AN4:AN0
    pins) may cause the input buffer to con-
    sume current that is out of the devices
    specification.
    AD Clock Source (TAD)
    Device Frequency
    Operation
    ADCS1:ADCS0
    20 MHz
    5 MHz
    1.25 MHz
    333.33 kHz
    2TOSC
    00
    100 ns(2)
    400 ns(2)
    1.6
    s6 s
    8TOSC
    01
    400 ns(2)
    1.6
    s6.4 s
    24
    s(3)
    32TOSC
    10
    1.6
    s6.4 s
    25.6
    s(3)
    96
    s(3)
    RC(5)
    11
    2 - 6
    s(1,4)
    2 - 6
    s(1,4)
    2 - 6
    s(1,4)
    2 - 6
    s(1)
    Legend: Shaded cells are outside of recommended range.
    Note 1: The RC source has a typical TAD time of 4
    s.
    2: These values violate the minimum required TAD time.
    3: For faster conversion times, the selection of another clock source is recommended.
    4: When device frequency is greater than 1 MHz, the RC A/D conversion clock source is recommended for
    sleep operation only.
    5: For extended voltage devices (LC), please refer to Electrical Specifications section.
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