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    參數(shù)資料
    型號: LTC1294CCN
    廠商: Linear Technology
    文件頁數(shù): 7/28頁
    文件大?。?/td> 0K
    描述: IC DATA ACQ SYSTEM 12BIT 20-DIP
    標(biāo)準(zhǔn)包裝: 18
    類型: 數(shù)據(jù)采集系統(tǒng)(DAS),ADC
    分辨率(位): 12 b
    采樣率(每秒): 46.5k
    數(shù)據(jù)接口: 串行,并聯(lián)
    電壓電源: 雙 ±
    電源電壓: ±5V,5V
    工作溫度: 0°C ~ 70°C
    安裝類型: 通孔
    封裝/外殼: 20-DIP(0.300",7.62mm)
    供應(yīng)商設(shè)備封裝: 20-PDIP
    包裝: 管件
    15
    LTC1293/LTC1294/LTC1296
    129346fs
    Interfacing to the Parallel Port of the Intel 8051 Family
    The Intel 8051 has been chosen to show the interface
    between the LTC1293/4/6 and parallel port microproces-
    sors. Usually the signals CS, DIN and CLK are generated
    on three port lines and the DOUT signal is read on a fourth
    port line. This works very well. One can save a line by tying
    the DIN and DOUT lines together. The 8051 first sends the
    start bit and DIN to the LTC1294 over the line connected to
    P1.2. Then P1.2 is reconfigured as an input and the 8051
    reads back the 12-bit A/D result over the same data line.
    U
    S
    A
    O
    PPLICATI
    WU
    U
    I FOR ATIO
    Data Exchange Between LTC1294 and MC68HC11
    Motorola SPI (MC68HC11)
    The MC68HC11 has been chosen as an example of an MPU
    with a dedicated serial port. This MPU transfers data MSB-
    first and in 8-bit increments. The DIN word sent to the data
    register starts the SPI process. With three 8-bit transfers,
    the A/D result is read into the MPU. The second 8-bit
    transfer clocks B11 through B8 of the A/D conversion
    result into the processor. The third 8-bit transfer clocks
    the remaining bits B7 through B0 into the MPU. The data
    is right justified in the two memory locations. ANDing the
    second byte with 0DHEX clears the four most significant
    bits. This operation was not included in the code. It can
    be inserted in the data gathering loop or outside the loop
    when the data is processed.
    Hardware and Software Interface to Motorola MC68HC11
    CS
    CLK
    DOUT
    MPU
    RECEIVED
    WORD
    LTC1293 TD01
    UNI
    SGL/
    DIFF
    ODD/
    EVEN
    SEL
    1
    SEL
    0
    START
    MSBF
    PS
    B3
    B7
    B6
    B5
    B4
    B2
    B0
    B1
    B11
    B10
    B9
    B8
    DIN
    MPU
    TRANSMIT
    WORD
    BYTE 3 (DUMMY)
    BYTE 2
    SGL
    0
    ODD
    SEL
    0
    SEL
    1
    BYTE 1
    X
    UNI MSBF
    PS
    X
    00
    1
    START
    X
    XX
    X
    BYTE 3
    BYTE 2
    ?
    BYTE 1
    B11
    ?
    0
    B10
    B8
    B9
    ??
    ?
    B7
    B6
    B4
    B5
    B3
    B2
    B0
    B1
    DON'T CARE
    LTC1293 TD01a
    CLK
    DOUT
    LTC1294
    CS
    ANALOG
    INPUTS
    DO
    SCK
    MISO
    MC68HC11
    DIN
    MOSI
    B2
    B1
    B0
    B3
    B4
    B6
    B7
    B5
    BYTE 1
    B10
    B9
    B8
    B11
    O
    OO
    DOUT FROM LTC1294 STORED ON MC68HC11 RAM
    BYTE 2
    LSB
    MSB
    #62
    #63
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