Data Sheet

747
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
31.5.9 Analog Connections
Not applicable.
31.5.10 Calibration
The output drivers for the DP/DM USB line interface can be tuned with calibration values from the production test. The
calibration values must be loaded from the NVM Software Calibration Area into the USB Pad Calibration register
(PADCAL) by software, before enabling the USB, to achieve the specified accuracy. Refer to “NVM Software Calibration
Area Mapping” on page 31 for further details.
For details on Pad Calibration, refer to Pad Calibration register PADCAL.