ATECC508A.SerialNumber.from_device_sn

You're seeing just the function from_device_sn, go back to ATECC508A.SerialNumber module for more information.
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from_device_sn(device_sn, encoded_dates)

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Specs

Compute a certificate serial number based on the device's 9-byte serial number and the encoded issue/expire date. This is used for device certificates.

Returns the serial number