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SDA (Serial Data)

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Serial Data Line utilized for communication between integrated circuits on an I2C bus.

expanded

The Serial Data Line (SDA) is a bidirectional line used within the Inter-Integrated Circuit (I2C) protocol to facilitate serial communication between components or circuits. SDA plays a critical role in enabling devices to send and receive data signals. Its typical operating conditions involve a maximum bus capacitance of 400 pF, with standard signal voltages ranging between 0V and 5V, depending on the devices in use.

examples

SDA is used in the communication interface between a microcontroller, such as the STM32F103, and a peripheral device like the BME280 environmental sensor.

In environmental monitoring systems, SDA allows the microcontroller to read temperature, humidity, and pressure measurements from the BME280 via I2C, supporting data exchange at speeds up to 100 kHz in standard mode.

SDA facilitates data transfer between an Arduino Uno and an OLED display like the SSD1306.

In prototyping and development tasks, SDA enables the Arduino to update the OLED display with real-time information or graphics, using the I2C speed of either 100 kHz or 400 kHz fast mode.