When designing a system that requires high channel density, such as in test instrumentation, there is typically a necessity to include a large number of switches on the board. When using switches controlled by a parallel interface, a large percentage of board space is taken up by the logic lines necessary to control the switches. In this article, learn how the new generation of serial peripheral interface (SPI) controlled switches from Analog Devices can address this design challenge.
Common Issues When Maximizing Channel Count
As modules become increasingly more complex, with the expectation that channel counts are maximized, board space begins to get restricted. Switches are key to increasing channel count, but board space is taken up by the switches themselves as well as by associated components. Ultimately, an inflection point can develop where it no longer makes sense to add more channels because board space requirements don’t allow for it.
Traditional Parallel Switch Solution
The most common solution to increasing channel density is to use switches that are controlled by parallel logic signals. This system requires a large amount of GPIO signals, which require a large number of switches and board space to generate.
SPI Switch Solution
Introducing SPI control to the system means that the switches now operate in a daisy-chain configuration. Using the devices in this format leads to an overall reduction in board size of up to 20%.
Conclusion
Analog Devices’ SPI switch solutions can help you design more compact IC boards, leading to finished products that meet customer demands for smaller and smaller devices. Click through to the article for further information.