Data Sheet

3
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
1. Configuration Summary
SAM D21J SAM D21G SAM D21E
Pins 64 48 32
General Purpose I/O-pins (GPIOs) 52 38 26
Flash 256/128/64/32KB 256/128/64/32KB 256/128/64/32KB
SRAM 32/16/8/4KB 32/16/8/4KB 32/16/8/4KB
Timer Counter (TC) instances 5 3 3
Waveform output channels per TC
instance
2 2 2
Timer Counter for Control (TCC)
instances
3 3 3
Waveform output channels per TCC 8/4/2 8/4/2 6/4/2
DMA channels 12 12 12
USB interface 1 1 1
Serial Communication Interface
(SERCOM) instances
6 6 4
Inter-IC Sound (I
2
S) interface 1 1 1
Analog-to-Digital Converter (ADC)
channels
20 14 10
Analog Comparators (AC) 2 2 2
Digital-to-Analog Converter (DAC)
channels
1 1 1
Real-Time Counter (RTC) Yes Yes Yes
RTC alarms 1 1 1
RTC compare values
1 32-bit value or
2 16-bit values
1 32-bit value or
2 16-bit values
1 32-bit value or
2 16-bit values
External Interrupt lines 16 16 16
Peripheral Touch Controller (PTC) X
and Y lines
16x16 12x10 10x6
Maximum CPU frequency 48MHz
Packages
QFN
TQFP
UFBGA
QFN
TQFP
WLCSP
QFN
TQFP
WLCSP
Oscillators
32.768kHz crystal oscillator (XOSC32K)
0.4-32MHz crystal oscillator (XOSC)
32.768kHz internal oscillator (OSC32K)
32kHz ultra-low-power internal oscillator (OSCULP32K)
8MHz high-accuracy internal oscillator (OSC8M)
48MHz Digital Frequency Locked Loop (DFLL48M)
96MHz Fractional Digital Phased Locked Loop (FDPLL96M)