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Jul 27, 2015 · Open drain acts as a "wired AND", which makes it easy to share the line and arbitrate collisions. CAN does something similar, although the physical layer is differential instead of single-ended. In I2C in particular, open drain allows the receiver to stretch the clock by holding it low when the receiver needs more time to process the data.
Sep 2, 2016 · Figure 6: Successful I2C Write Byte Transmission. In response to recognizing its address and the write command, the addressed device responds by sending an acknowledge bit (ACK) as feedback to the MASTER that a SLAVE device with the correct address is present on the bus and awaiting further communication.
1 I. 2. C Overview. I. 2. C is a two-wire serial communication protocol using a serial data line (SDA) and a serial clock line (SCL). The protocol supports multiple target devices on a communication bus and can also support multiple controllers that
Note: Multi master is not covered in this I2C tutorial as the more common use of I2C is to use a single bus master to control peripheral devices e.g. serial memory, ADC, RTC etc. Data and Clock. The I2C interface uses two bi-directional lines meaning that any device could drive either line.
The open-drain connection are used on both SDA and SCL lines and connect to an NMOS transistor. This diagram shows an I2C device connected to an SDA or SCL line with a pull-up resistor to VDD. This open-drain connection controls the I2C communication line and pulls it low or releases it high. To set the voltage level of the SDA or SCL line, the ...
wishes to start a new communication, but does not wish to let the bus go idle with the STOP condition, which has the chance of the master losing control of the bus to another master (in multi-master environments). 2.2 Data Validity and Byte Format One data bit is transferred during each clock pulse of the SCL. One byte is comprised of eight ...
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Why does I2C use a wired-AND connection?
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Why do I2C lines use open drain driver instead of Tri-State drivers?
Unlike UART or SPI connections, the I2C bus drivers are "open drain", meaning that they can pull the corresponding signal line low, but cannot drive it high. Thus, Thus, there can be no bus contention where one device is trying to drive the line high while another tries to pull it low, eliminating the potential for damage to the drivers
