Atmel SAM L21 Xplained Pro Manual de usuario

Atmel SAM L21

picoPower

Cortex-M0+

Microcontrollers

•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

•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

•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

•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

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

•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

•Support for write while read (WWR)

•Less overhead for emulated EEPROM

•Makes FW upgrades easier

Updated Peripherals

NVM

•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)

•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

•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)

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