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[AVR] In SPI connection, what is buffer and open drain?

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fateme91

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spi ? bufer? open drain?

Hi
in spi connection . i've heard about buffer i don't know where and how should use? and what is open drain at it?

tnks
 

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Re: spi ? bufer? open drain?

If you are asking how to connect peripheral devices with SPI interface to a microcontroller, you won't use a buffer in a first order, just connect the SPI signals SCK, MOSI (master-out/slave-in) and MISO (reverse direction) and an individual slave select for each peripheral device. All involved outputs are usually push-pull, not open drain. Periperal data outputs (MISO) are tristated to allow parallel operation of multiple devices. See also https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus

Buffers may be nevertheless required in special cases, e.g. as level translation between 3.3V and 5V supplied devices.
 
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