\(\varDelta \varSigma \) analog-to-digital converters (ADCs) are largely used in sensor acquisition applications. In the last few years, standalone \(\varDelta \varSigma \) modulators have become increasingly available as off-the-shelf parts. To build a complete ADC, a standalone modulator has to be paired with some advanced elaboration unit, such as a field programmable gate array (FPGA) or a digital signal processor (DSP), which is needed for the implementation of the decimation filter. This work investigates the use of low-cost, general-purpose microcontrollers for the decimation of \(\varDelta \varSigma \)-modulated signals. The main challenge is given by the clock frequency of the modulator, which can be in the range of a few \(\hbox {MHz}\). The proposed technique deals with this limitation by employing two serial peripheral interface (SPI) modules in a time-interleaved configuration. This approach allows for continuous acquisition and elaboration of relatively high-speed, digital signals. The technique has been applied to a case study, and a data conversion system has been practically realized. The performance of the proposed filter is compared to that of a digital filter, present on board a commercial microcontroller, and the results of experimental tests are provided.

\(\varDelta \varSigma \)模数转换器 (ADC) 主要用于传感器采集应用。在过去的几年里，独立的\(\varDelta \varSigma \)调制器作为现成的部件越来越多地可用。要构建完整的 ADC，独立调制器必须与一些高级精细单元配对，例如现场可编程门阵列 (FPGA) 或数字信号处理器 (DSP)，这是实现抽取滤波器所需的。这项工作研究了使用低成本的通用微控制器来抽取\(\varDelta \varSigma \)调制信号。主要挑战在于调制器的时钟频率，它可以在几个\(\hbox {MHz}\). 所提出的技术通过在时间交错配置中采用两个串行外设接口 (SPI) 模块来解决这一限制。这种方法允许连续采集和处理相对高速的数字信号。该技术已应用于案例研究，并已实际实现了数据转换系统。将所提出的滤波器的性能与商用微控制器上的数字滤波器的性能进行比较，并提供了实验测试结果。