厦门莫格电气自动化有限公司销售
HARRIS SD-98750
您迈开询价的一小步，我还您成功的一大步。
SD-98750
SD-98750
SD-98750
周期开始时，发送一个PWM脉冲到触发路由单元(TRU)，后者负责将触发主机连接至触发从机。在本例中，PWM为触发主机，ADC控制器(ADCC)定时器为触发从机。ADCC需要具备管理大量事件的能力，并使用定时器(TMR0/TMR1)来跟踪从PWM触发到启动特定ADC事件所需时间。在定时器与特定事件相匹配的情况下，选择的是ADC输入多路复用(M0和M1)和通道(ADC0和ADC1)。接下来，将转换开始信号发送至ADC。采样数据从ADC移至ADCC，然后从ADCC通过DMA移至微控制器SRAM。
下面的图3所示为PWM脉冲、PWM同步和ADCC所控制ADC事件之间的相对时序。
图3 用ADC对5个不同电机控制变量进行采样的时序
对于面向电机控制的混合信号控制处理器设计，其在PWM、TRU、多路复用、缓冲、SARADC和DMA方面有着良好的知识产权基础。然而，为了在PWM周期中实现ADC采样的精密时序，必须对这些模块的设计进行特别的改动。ADCC模块的必要性是有事实依据的，即其他知识产权模块集成于单枚芯片中，它们之间需要协调。ADCC即专门针对这一要求而设计，充分发挥了两个ADC引擎的高速优势，这些ADC引擎的转换时间快达380ns。
结论
***基础技术只是个开端而已——芯片设计师必须对客户的系统有着***的了解，并在精密模拟和数字元件的设计、应用及优化方面具备深厚的***知识。另外，芯片制造商必须愿意并有能力与系统制造商进行直接互动和协作，共同打造新型产品。选用***合适的元件，针对目标终端应用进行优化，对知识产权模块进行改动，使其默契配合。只有这些条件得到满足，才能将优化的***元件有机地整合起来。ADI公司即推出了此类智能集成产品的良好典范，其中包括ADuCM360(一款完全集成式3.9kSPS、24位数据采集系统)以及ADSP-CM403F和ADSP-CM408F(集成两个高精度16位ADC和ARMCortex-M4处理器内核的混合信号控制处理器)。
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