Now any of the MOSFETS can pull the voltage at theĭrain to ground. The open drain system simply means that multiple MOSFETS can beĬonnected together at the Drain terminal which is then connected to a When inactive (Gate voltage < Source voltage) When active (Gate voltage > Source voltage) then current flowsįrom drain to source. The topĬonnection is the Drain, the middle connection is the Gate (controller) N-Channel MOSFET that has connections: Drain, Gate and Source. I2C works by using open drain connections. I2C Tutorial - How I2C works Open drain connections. Is also no concept of multiple master devices, but SPI is faster. Using I2C it is also possible to have multiple master devices making the system more flexible. So I2C is more robust in a noisy environment. Unlike the SPI protocol, the I2C protocol has an acknowledgementįeature that means a sending device knows that a receiver has accepted theĭata. The great strength of the protocol is that it only requires two wires, yetĬan have many connected devices and all of these can transmit and receive dataĪt high speed. So a faster clock allows a quicker update. Speed is important as the data is transmitted serially, Not all chips support all speeds but 100kHz isĬommonly supported. I2C is a serial protocol that can operate at different speeds 100kHz,Ĥ00kHz, and 3.4MHz. Manufacturers avoid paying royalties, or avoid patent problems, byĬalling it a 2 wire protocol but it's the same I2C protocol (when you Most common use for I2C in a small system.
Level discussing single master mode (a single controlling device) which is the This I2C tutorial shows you how the I2C protocol works at the physical bit With I2C extenders - just don't do it - it ends in tears! (horror stories) of people designing a multi drop inter office communication system Warning: The protocol is designed for single boardĬommunication it is not a long distance communication system.
#Arduino i2c example how to
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