Atmel SAM D20J / SAM D20G / SAM D20E
ARM-Based Microcontroller
DATASHEET SUMMARY
Description
The Atmel
®
SAM D20 is a series of low-power microcontrollers using the 32-bit
ARM
®
Cortex
®
-M0+ processor, and ranging from 32- to 64-pins with up to 256KB Flash and
32KB of SRAM. The SAM D20 devices operate at a maximum frequency of 48MHz and
reach 2.14 Coremark/MHz. They are designed for simple and intuitive migration with
identical peripheral modules, hex compatible code, identical linear address map and pin
compatible migration paths between all devices in the product series. All devices include
intelligent and flexible peripherals, Atmel Event System for inter-peripheral signaling, and
support for capacitive touch button, slider and wheel user interfaces.
The Atmel SAM D20 devices provide the following features: In-system programmable Flash,
eight-channel Event System, programmable interrupt controller, up to 52 programmable I/O
pins, 32-bit real-time clock and calendar, up to eight 16-bit Timer/Counters (TC). The
timer/counters can be configured to perform frequency and waveform generation, program
execution timing or input capture with time and frequency measurement of digital signals.
The TCs can operate in 8- or 16-bit mode, or be cascaded to form a 32-bit TC. The series
provide up to six Serial Communication Modules (SERCOM) that each can be configured to
act as an USART, UART, SPI and I
2
C up to 400kHz; up to twenty-channel 350ksps 12-bit
ADC with programmable gain and optional oversampling and decimation supporting up to
16-bit resolution, one 10-bit 350ksps DAC, two analog comparators with window mode,
Peripheral Touch Controller supporting up to 256 buttons, sliders, wheels, and proximity
sensing; programmable Watchdog Timer, brown-out detector and power-on reset, and two-
pin Serial Wire Debug (SWD) program and debug interface.
All devices have accurate and low-power external and internal oscillators. All oscillators can
be used as a source for the system clock. Different clock domains can be independently
configured to run at different frequencies while enabling power saving by running each
peripheral at its optimal clock frequency.
The SAM D20 devices have two software-selectable sleep modes, idle and standby. In idle
mode the CPU is stopped while all other functions can be kept running. In standby all clocks
and functions are stopped expect those selected to continue running. The device supports
SleepWalking, which is the module's ability to wake itself up and wake up its own clock, and
hence perform predefined tasks without waking up the CPU. The CPU can then be only
woken on a need basis, e.g. a threshold is crossed or a result is ready. The Event System
supports synchronous and asynchronous events, allowing peripherals to receive, react to
and send events even in standby mode.
The Flash program memory can be reprogrammed in-system through the SWD interface.
The same interface can be used for non-intrusive on-chip debug of application code. A boot
loader running in the device can use any communication interface to download and upgrade
the application program in the Flash memory.
The Atmel SAM D20 devices are supported with a full suite of program and system
development tools, including C compilers, macro assemblers, program
debugger/simulators, programmers and evaluation kits
.
42129JS–SAM–12/2013
Features
Processor
ARM Cortex-M0+ CPU running at up to 48MHz
Single-cycle hardware multiplier
Memories
16/32/64/128/256KB in-system self-programmable flash
2/4/8/16/32KB SRAM
System
Power-on reset (POR) and brown-out detection (BOD)
Internal and external clock options with 48MHz Digital Frequency Locked Loop (DFLL48M)
External Interrupt Controller (EIC)
16 external interrupts
One non-maskable interrupt
Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
Low Power
Idle and standby sleep modes
SleepWalking peripherals
Peripherals
8-channel Event System
Up to eight 16-bit Timer/Counters (TC), configurable as either:
One 16-bit TC with compare/capture channels
One 8-bit TC with compare/capture channels
One 32-bit TC with compare/capture channels, by using two TCs
32-bit Real Time Counter (RTC) with clock/calendar function
Watchdog Timer (WDT)
CRC-32 generator
Up to six Serial Communication Interfaces (SERCOM), each configurable to operate as either:
USART with full-duplex and single-wire half-duplex configuration
I
2
C up to 400kHz
SPI
One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels
Differential and single-ended channels
1/2x to 16x gain stage
Automatic offset and gain error compensation
Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution
10-bit, 350ksps Digital-to-Analog Converter (DAC)
Two Analog Comparators with window compare function
Peripheral Touch Controller (PTC)
256-Channel capacitive touch and proximity sensing
I/O
Up to 52 programmable I/O pins
Packages
64-pin TQFP, QFN
48-pin TQFP, QFN
32-pin TQFP, QFN
Operating Voltage
1.62V – 3.63V
Power Consumption
Down to 70µA/MHz in active mode
Down to 8µA running the Peripheral Touch Controller
Atmel SAM D20 [DATASHEET Summary]
42129JS–SAM–12/2013
2
1.
Configuration Summary
SAM D20J
SAM D20G
48
38
256/128/64/32/16KB
32/16/8/4/2KB
48MHz
8
8
2
6
20
2
1
Yes
1
1 32-bit value or
2 16-bit values
16
16x16
8
6
2
6
14
2
1
Yes
1
1 32-bit value or
2 16-bit values
16
12x10
8
6
2
4
10
2
1
Yes
1
1 32-bit value or
2 16-bit values
16
10x6
SAM D20E
32
26
256/128/64/32/16KB
32/16/8/4/2KB
64
52
256/128/64/32/16KB
32/16/8/4/2KB
Number of pins
General Purpose I/O-pins (GPIOs)
Flash
SRAM
Maximum CPU frequency
Event System channels
Timer Counter (TC)
Waveform output channels for TC
Serial Communication Interface
(SERCOM)
Analog-to-Digital Converter (ADC)
channels
Analog comparators
Digital-to-Analog Converter (DAC)
channels
Real-Time Counter (RTC)
RTC alarms
RTC compare values
External Interrupt lines
Peripheral Touch Controller (PTC) X
and Y lines
Packages
QFN
TQFP
QFN
TQFP
QFN
TQFP
Oscillators
32.768kHz crystal oscillator (XOSC32K)
0.4-32MHz crystal oscillator (XOSC)
32.768kHzinternal oscillator (OSC32K)
32kHz ultra-low-power internal oscillator (OSCULP32K)
8MHz high-accuracy internal oscillator (OSC8M)
48MHz Digital Frequency Locked Loop (DFLL48M)
Yes
Yes
Yes
Yes
Yes
Yes
SW Debug Interface
Watchdog Timer (WDT)
Atmel SAM D20 [DATASHEET Summary]
42129JS–SAM–12/2013
3
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