Microcontrollers for Sensors and Data Acquisition

　　Microcontrollers for Sensors and Data Acquisition

　　早期的微處理器和微控制器是純數(shù)字設(shè)備，與模擬功能無關(guān)。然而，擁有片上A／D和D／D的優(yōu)點很快就顯現(xiàn)出來，而今天你很難找到一個不具有某種形式的混合信號功能的微控制器家族。

　　事實上，有一系列的活動支持混合信號處理和片上系統(tǒng)解決方案。在某些情況下，轉(zhuǎn)換器的分辨率從8位移到24位，片上運算放大器和比較器現(xiàn)在靈活地路由到轉(zhuǎn)換器級。即使是DSP功能和浮點數(shù)學函數(shù)也允許固件更簡潔，因為流水線架構(gòu)填充數(shù)據(jù)。

　　本文探討了一系列不同大小和功能的混合信號芯片微控制器，這些芯片現(xiàn)在都很容易支持傳感器接口的新混合信號設(shè)計。

　　Size matters

　　Remote and distributed sensor systems call for a small， low-power processor that will either run on batteries， energy harvesting， or remote power supplied through long runs of cable. In any event， remote sensors need to be small， rugged， reliable， and able to operate on a very limited power budget.

　　A case in point is the SOT 6-pin Microchip PIC10F220T-I/OT， which contains two 8-bit A/D converters （see Figure 1）。 An internal 8 MHz clock processes the 33 single-cycle instructions in 500 ns using a two stage pipeline; the micro goes into standby mode draining only 100 nA at two volts. Power supply range is two to five volts.