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pinout.vvzero.com/src/en/pin/pin-5.md

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SCL (I2C1 Clock) is one of the i2c pins on the Pi, learn more about i2c.

SCL includes a fixed, 1.8 kΩ pull-up to 3.3v, which means this pin is not suitable for use as a general purpose IO where no pull-up resistor is desired.