基于S3C44B0的糖厂pH值控制器的设计

Design of Sugar-refinery pH Controller Based on S3C44B0

介绍了一种基于ARM7微处理器S3C44B0的pH值控制器的构成,包括CPLD(Complex Programmable Logical Device)芯片EPM7128S、A/D转换芯片AD7874以及D/A转换芯片DAC8420等接口芯片的软硬件设计。通过EPM7128S的多电压I/O接口,不仅解决了微处理器I/O的扩展问题,同时还解决了微处理器I/O输出电平与外设驱动电平不匹配问题。

This paper introduces the functional block diagram of pH controller based on ARM7 microprocessor S3C44B0, including the software and hardware designs for the interfaces such as Complex Programmable Logical Device （CPLD） EPM 7128S, A/D converter AD7874 and D/A converter DAC8420 etc. Not only the problem of the microprocessor＇s I/O extension but also the problem about the voltage mismatch between microprocessor＇s I/O and the peripheral equipments can be solved by using the MultiVolt I/O interface of EPM7128S.