48.18 Rev. F – 07/2015

Ordering Information
Added ATSAMD21E15B-UUT and ATSAMD21E16B-UUT ordering codes (WLCSP35 package option).
Block Diagram
Updated system block diagram.
Pinout
Added pinout figure for WLCSP35.
Product Mapping
Updated Internal RWW section to start address from 0x00010000 to 0x00400000.
ADC - Analog-to-Digital Converter
References to AREFA and AREFB replaced with VREFA and VREFB respectively.
Electrical Characteristics at 85℃

Added GPIO cluster note to 'Absolute Maximum Ratings.

Added I2S Timing.

Updated BOD33 characteristics.

Added characterization data for Device Variant B.

Packaging Information

Updated ΘJC value from 3.1 to 15.0 °C/W for 32-pin QFN package in Thermal Resistance Data.

Added package drawing for 35 ball WLCSP (Device Variant B).

Schematic Checklist

Power Supply Connections:

VDDCORE decoupling capacitor value updated from 100nF to 1μF.

References to AREFA and AREFB replaced with VREFA and VREFB respectively.

Electrical Characteristics at 125C

Added I2S Timing.

Updated BOD33 characteristics.

Added characterization data for Device Variant B.