Atmel SAM L21 Xplained Pro User manual

© 2015 Atmel Corporation
1
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)