11/1/2023 0 Comments SPI totem pole output![]() This is normally an active low signal and is pulled high to disconnect the subnode from the SPI bus. ![]() The chip select signal from the main is used to select the subnode. Figure 1 shows the SPI connection between the main and the subnode. SPI interfaces can have only one main and can have one or multiple subnodes. ![]() Users should consult the product data sheet for the clock frequency specification of the SPI interface. SPI devices support much higher clock frequencies compared to I 2C interfaces. Data transmitted between the main and the subnode is synchronized to the clock generated by the main. The device that generates the clock signal is called the main. SPI configuration with main and a subnode. This article focuses on the popular 4-wire SPI interface. The SPI interface can be either 3-wire or 4-wire. Both main and subnode can transmit data at the same time. The data from the main or the subnode is synchronized on the rising or falling clock edge. SPI is a synchronous, full duplex main-subnode-based interface. This article provides a brief description of the SPI interface followed by an introduction to Analog Devices’ SPI enabled switches and muxes, and how they help reduce the number of digital GPIOs in system board design. Serial peripheral interface (SPI) is one of the most widely used interfaces between microcontroller and peripheral ICs such as sensors, ADCs, DACs, shift registers, SRAM, and others.
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