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Home :: Embedded Protocols :: Serial Peripheral Interface SPI Advantages and Disadvantages ::



Serial Peripheral Interface SPI : Advantages and Disadvantages

This web tutorials section contains overview and brief explanation of Serial Peripheral Interface SPI. User can select appropriate content index which is required to improve user's knowledge.

Other Serial Peripheral Interface SPI Related Contents:
» Introduction and Operation
» Data Transmission
» Clock Polarity and Phase
» Configuration and Mode
» Valid SPI Communications and Interrupts
» Advantages and Disadvantages
» Applications
Advantages

* Full duplex communication

* Higher throughput than I²C or SMBus

* Complete protocol flexibility for the bits transferred

o Not limited to 8-bit words

o Arbitrary choice of message size, content, and purpose

* Extremely simple hardware interfacing

o Typically lower power requirements than I²C or SMBus due to less circuitry (including pullups)

o No arbitration or associated failure modes

o Slaves use the master's clock, and don't need precision oscillators

o Slaves don't need a unique address -- unlike I²C or GPIB or SCSI

o Transceivers are not needed

* Uses only four pins on IC packages, and wires in board layouts or connectors, much less than parallel interfaces

* At most one "unique" bus signal per device (chip select); all others are shared

* Signals are unidirectional allowing for easy Galvanic isolation

Disadvantages

* Requires more pins on IC packages than I²C, even in the "3-Wire" variant

* No in-band addressing; out-of-band chip select signals are required on shared buses

* No hardware flow control

* No hardware slave acknowledgment (the master could be "talking" to nothing and not know it)

* Supports only one master device

* Without a formal standard, validating conformance is not possible

* Only handles short distances compared to RS-232, RS-485, or CAN-bus


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