Serial Peripheral Interface
The Serial Peripheral Interface (SPI) is a synchronous serial communication interface specification. It is used for short-distance communication, primarily in embedded systems. SPI devices communicate in full duplex mode using a master-slave architecture.
The master (controller) device originates the frame for reading and writing. The SPI may be accurately described as a synchronous serial interface.[1] But it is different from the Synchronous Serial Interface (SSI) protocol.
Developer
The interface was developed by Motorola in the mid-1980s. Later it has become a de facto standard.
Pros and cons
Advantages
- Full duplex communication in the default version of this protocol
- Push-pull drivers (as opposed to open drain) provide good signal integrity and high speed
- Higher throughput than I²C or SMBus. Not limited to any maximum clock speed, enabling potentially high speed
- Complete protocol flexibility for the bits transferred
- Not limited to 8-bit words
- Arbitrary choice of message size, content, and purpose
- Simple software implementation
Disadvantages
- Requires more pins on IC packages than I²C, even in the three-wire variant
- No in-band addressing; out-of-band chip select signals are required on shared buses
- SPI does not support hot swapping (dynamically adding nodes)
- Some variants like dual SPI, quad SPI, and three-wire serial buses defined below are half-duplex.
Applications
- Memory: SD Card , MMC , EEPROM , Flash.
- Sensors: Temperature and Pressure.
- Control Devices: ADC , DAC , digital POTS and Audio Codec.
- Others: Camera Lens Mount, touchscreen, LCD, RTC, video game controller, etc.[2]
Sources
- ↑ "What is Serial Synchronous Interface (SSI)?". Retrieved 2015-01-28.
- ↑ Anusha (2017-06-20). "Basics of Serial Peripheral Interface (SPI)". Electronics Hub. Retrieved 2022-08-29.