Atmel SAM L21 Xplained Pro User manual

© 2015 Atmel Corporation
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Atmel SAM L21
picoPower
Cortex-M0+
Microcontrollers

2 © 2015 Atmel Corporation
•New Ultra Low Power Cortex-M0+ Based
microcontroller family
•Targeted for Battery powered applications
•Industries first Ultra Low Power Large Flash and SRAM Cortex-M0+
•Designed with emphasis on
•Low active mode power consumption
•Smart Low power peripherals
•Industry leading RAM retention numbers
•Leveraging two decades of Atmel Ultra Low power ARM, AVR and
AVR32 know how
•Easy migration from existing SAM D families
•Code compatible to existing families with ASF
SAM L21

3 © 2015 Atmel Corporation
•Regulators & oscillators
•Multiple power sources and clocking options
•Flexible sleep modes
•Scale performance & power consumption
•Event System and Sleepwalking
•Multiple Domains
•Power & clock gating
•picoPower peripherals
•SERCOM, PTC & TC
•Low power analog
•Ultra Low power Process
The worlds lowest power Cortex-M0+ Micro
Design methodology for picoPower devices
Overview of SAM L21 Power Domains

4 © 2015 Atmel Corporation
•SAM D21 active mode running coremark 103uA/MHz
•SAM L21 35uA/MHz
•Most competitors are in the 120-160 uA/MHz range for their
comparable devices
•SAM D21 sleep mode with RAM retention and RTC: 3.8uA
•SAM L21 0.9uA
•No other vendors offer large SRAM low leakage CM0+
SAM L21 compared to SAM D21

5 © 2015 Atmel Corporation
•From 350 Ksps (D20/21) to 1Msps / 10K min sps
•3 new internal inputs
•OPAMP01
•OPAMP2
•Scaled VBAT
•No fixed gain stage
•OPAMP can be used for Gain
•Flexible Power / Throughput rate management
•Input scan is changed to Sequencing
•More flexible than input scan
•Inputs do not need to be in a continuous sequence (input 3,4,5,6...)
•It is possible to select specific inputs to scan from lowest to highest
(inputs 3,5,6 14...)
Updated Peripherals
ADC
ADC
ADC0
ADCn
...
Int. Sig
ADC0
ADCn
Int. Sig
...
INPUTCTRL
REFCTRL
INT1V
INTVCC
AREFB
CFGA
RESULT
OFFSETCORR
GAINCORRSWTRIG
EVCTRL
AVGCTRL
WINCTRL
SAMPCTRL WINUT
Post
Processing
PRESCALER
CTRLA
WINLT
AREFA

6 © 2015 Atmel Corporation
•1Msps (350Ksps in D20/21)
•12-bit DAC (10 in D20/21)
•4-bit Dithering mode to reduce quantization error / extend
resolution
•Can max be performed at 1Msps/16 (62500 sps)
•Will have to use one event channel and one TC in order to work
•If you are converting a 44Ksps 16-bit signal this can give you a 16-bit
conversion over the standard 12-bits
•2 DACs or single DAC in differential mode
•DMA support (dedicated trigger line)
Updated Peripherals
DAC

8 © 2015 Atmel Corporation
•Support for write while read (WWR)
•Less overhead for emulated EEPROM
•Makes FW upgrades easier
Updated Peripherals
NVM

10 © 2015 Atmel Corporation
•The touch performance of the SAM L21 PTC is identical to that of
the SAM D series, but
•A touch accelerator was added to reduce CPU load and reduce overall
power consumption
•Overall power consumption of the module was reduced
•The PTC is located in the low power domain and can remain
powered while the rest of the system is sleeping
Wake up from touch on less than 2uA!
Updated Peripherals
Peripheral Touch Controller (PTC)

11 © 2015 Atmel Corporation
•Sleep mode
•The USB module can put the microcontroller in any sleep mode when
the USB bus is idle and a suspend condition is given.
•Upon bus resume the USB module can wake the microcontroller from
any sleep mode
Updated Peripherals
Full Speed USB host and Device

12 © 2015 Atmel Corporation
•Glue logic for general purpose PCB design
•Up to four programmable three input Look Up Table units (LUT)
•Combinatorial Logic Functions
•AND, NAND, OR, NOR, XOR, XNOR, NOT
•Sequential Logic Functions
•Gated D Flip-Flop, JK Flip-Flop, gated D Latch, RS Latch
•Flexible LookUp Table Inputs Selection
•I/Os
•Events
•Internal Peripherals
•Subsequent LUT Output
•Output can be connected to IO pins or Event System
•Optional synchronizer, filter or edge detector available on each LUT
output
New Peripherals
Configurable Custom Logic (CCL)

13 © 2015 Atmel Corporation
•Decrypt and Encrypt
•128 bit block of input data
•128/192/256 bit keys supported
•Encryption time of 57/67/77 cycles with 128-bit/192-bit/256-bit
cryptographic key
•Automatic or manual start
•Automatic conversion starts when input register is filled with the correct
amount of data
New Peripherals
AES –Advanced Encryption Standard

14 © 2015 Atmel Corporation
•(TRNG) passes the American NIST Special Publication 800-22 and
Diehard RandomTests Suites
•When enabled generates a new 32-bit random number every 84
CLK_TRNG_APB cycles.
•Optional Interrupt when a new random number is available
•Can be used to generate inputs for Authentication challenges
11/2/2015
New Peripherals
TRNG –True Random Number Generator

15 © 2015 Atmel Corporation
•3 Individually configurable low power OpAmps
•Can be interconnected
•Rail to Rail inputs
•No need for external components with internal feedback resistors
•Internal resistors are muxable to form different
resistor-OpAmp circuits
•Inputs available
•GPIO pins
•DAC
•Ground
•Output available:
•On GPIO pins
•Can be used as Input for AC and ADC
•Low power configuration options
•Performance/latency vs power
•On demand start-up for ADC and AC operations
New Peripherals
Op-Amp

16 © 2015 Atmel Corporation
•UART with wake-up from standby sleep
•auto-baud detection up to 115.2kbps
•Functional in sleep mode
•Connected to DMA
•Message reception in standby
•Operational in standby sleep
•Limit DMA or CPU resources used = lower power
•Built in logic
•Built in buffer
•picoPower SEROM is Optimized for low power consumption not high
performance
New low power features
picoPower SerCom

17 © 2015 Atmel Corporation
•BOD33 or Automatic Power Switch can switch the backup domain to
VBAT pin automatically
•Retains battery backup registers and RTC
•Backup domain can be forced to run from VBAT pin
New low power features
Battery backup mode

18 © 2015 Atmel Corporation
•BACKUP Mode
•Most of logic and analog cells are powered off. The backup domain is kept
powered (RTC, BOD, WDT, 32kHz clock sources and wake-up from external pins).
•OFF
•Core and backup domains are powered off.
•Cannot be entered if WDT is running
•Reset pin only source of wakeup
•Regulators
•On the Fly selection of LDO and Buck regulator
New low power features
Sleep modes BACKUP and OFF

© 2015 Atmel Corporation
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SAM L21 Tools

20 © 2015 Atmel Corporation
•Xplained Pro with power measurements
•Full support in Atmel Studio and ASF
•Appnotes
•Example code and projects
•QTouch support for
•Buttons
•Slider
•Wheels
•Surface
Tools for SAM L21

21 © 2015 Atmel Corporation
•Power consumption measurement and visualization
•Support power profiling on SAML21 using SAML21-XPRO board.
•Demonstrate low power modes of SAML21
•Program Counter values included to track power consumers in your application
SAM L21 tools
Added features in Atmel Tools for picoPower Atmel|SMART

22 © 2015 Atmel Corporation
Flash / SRAM / LP SRAM
Sub-Series
256KB / 32KB / 8KB
128KB / 16KB / 8KB
64KB / 8KB / 4KB
32KB / 4KB / 2KB
Package
32-pin QFN and TQFP
48-pin QFN and TQFP
64-pin QFN and TQFP
Introduction
SAM L21 Series
SAM L21G
3x 16b T/C
6x SERCOM
14-ch ADC
2-ch DAC
2x An.comp
Main Features and Functions in all devices:
ARM Cortex M0+ CPU at 48 MHz, 1.62-3.6V operation, -40°C –85°C temp grade
Ultra low power analog: 12-bit 1 Msps ADC, 12-bit DAC, 2 analog comparators, 3x op-amp
Peripheral Touch Controller, 32-bit RTC with calendar mode, AES, TRNG
12-ch Event system, and 16-ch DMA controller with next generation SleepWalking
USB host/device, SERCOM supports USART, UART with autobaud,
SPI, I2C up to 3.4MHz, PM/SMBus, IrDA
3 Timer/Counters for Control applications, Ultra low power SERCOM and Timer/Counter
SAM L21J
5x 16b T/C
6x SERCOM
20-ch ADC
2-ch DAC
2x An.comp
SAM L21E
3x 16b T/C
4x SERCOM
10-ch ADC
2-ch DAC
2x An.comp