文件名称:tlv1544
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TLV1544与TMS320VC5402通过串行口连接,此时,A/D转换芯片作为从设备,DSP提供帧同步和输入/输出时钟信号。TLV1544与DSP之间数据交换的时序图如图3所示。
开始时, 为高电平(芯片处于非激活状态),DATA IN和I/OCLK无效,DATAOUT处于高阻状态。当串行接口使CS变低(激活),芯片开始工作,I/OCLK和DATAIN能使DATA OUT不再处于高阻状态。DSP通过I/OCLK引脚提供输入/输出时钟8序列,当由DSP提供的帧同步脉冲到来后,芯片从DATA IN接收4 b通道选择地址,同时从DATAOUT送出的前一次转换的结果,由DSP串行接收。I/OCLK接收DSP送出的输入序列长度为10~16个时钟周期。前4个有效时钟周期,将从DATAIN输入的4 b输入数据装载到输入数据寄存器,选择所需的模拟通道。接下来的6个时钟周期提供模拟输入采样的控制时间。模拟输入的采样在前10个I/O时钟序列后停止。第10个时钟沿(确切的I/O时钟边缘,即上升沿或下降沿,取决于操作的模式选择)将EOC变低,转换开始。
-TLV1544 with TMS320VC5402 through serial port connectivity, at this time, A / D conversion chip as from the equipment, to provide fr a me synchronization DSP and input / output clock signal. TLV1544 DSP and data exchange between the chronology of the map is shown in figure 3. At the beginning of the margin (in chip-activated), and I DATA IN / OCLK invalid, DATAOUT at high resistance state. When the serial interface CS change low (activator), the chip start work, I / OCLK and DATAIN can DATA OUT is no longer in a state of high resistance. DSP through I / OCLK pin provide input / output clock 8 sequence, When the DSP from the fr a me synchronization pulse, the chip from the DATA IN receive four channels to choose b address, DATAOUT sent from the same time the previous conversion results from the
开始时, 为高电平(芯片处于非激活状态),DATA IN和I/OCLK无效,DATAOUT处于高阻状态。当串行接口使CS变低(激活),芯片开始工作,I/OCLK和DATAIN能使DATA OUT不再处于高阻状态。DSP通过I/OCLK引脚提供输入/输出时钟8序列,当由DSP提供的帧同步脉冲到来后,芯片从DATA IN接收4 b通道选择地址,同时从DATAOUT送出的前一次转换的结果,由DSP串行接收。I/OCLK接收DSP送出的输入序列长度为10~16个时钟周期。前4个有效时钟周期,将从DATAIN输入的4 b输入数据装载到输入数据寄存器,选择所需的模拟通道。接下来的6个时钟周期提供模拟输入采样的控制时间。模拟输入的采样在前10个I/O时钟序列后停止。第10个时钟沿(确切的I/O时钟边缘,即上升沿或下降沿,取决于操作的模式选择)将EOC变低,转换开始。
-TLV1544 with TMS320VC5402 through serial port connectivity, at this time, A / D conversion chip as from the equipment, to provide fr a me synchronization DSP and input / output clock signal. TLV1544 DSP and data exchange between the chronology of the map is shown in figure 3. At the beginning of the margin (in chip-activated), and I DATA IN / OCLK invalid, DATAOUT at high resistance state. When the serial interface CS change low (activator), the chip start work, I / OCLK and DATAIN can DATA OUT is no longer in a state of high resistance. DSP through I / OCLK pin provide input / output clock 8 sequence, When the DSP from the fr a me synchronization pulse, the chip from the DATA IN receive four channels to choose b address, DATAOUT sent from the same time the previous conversion results from the
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