BME280 footprint, schematic symbol and 3D model by BOSCH

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BME280 Details

The recommended power-on sequence is to first apply VDD (1.71V to 3.6V) and then apply VDDIO (1.2V to 3.6V). This ensures that the internal voltage regulators are properly initialized.
The BME280 can stretch the I2C clock to slow down the bus speed. To handle this, the master device should be able to handle clock stretching by waiting for the SCL line to go high before sending the next clock pulse.
The 'chip_id' register (0xD0) contains the device identifier, which can be used to verify that the BME280 is properly connected and functioning.
The BME280 does not require calibration. The device is calibrated during manufacturing, and the calibration data is stored in the device's OTP (One-Time Programmable) memory.
The maximum cable length for the BME280's I2C interface depends on the system design and the capacitance of the bus. As a general guideline, a cable length of up to 30 cm (12 inches) is recommended.

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