ATSAMR34/35 - LoRa radio plus Cortex-M0+ microcontroller for the Internet of Things. Free Technical Library News

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ATSAMR34/35 - LoRa radio plus Cortex-M0+ MCU for IoT

17.02.2019

Microchip announced the release of a single-chip LoRa (Long Range) wireless data transmission solution. The ATSAMR34 and ATSAMR35 chips operate in the 868 MHz frequency range and contain a low-power SAML21 Cortex M0+ microcontroller with a Semtech SX1276 transceiver. The new wireless microcontroller allows for two-way radio communication at a distance of up to 15 kilometers, while the device can be connected both in a standard LoRaWAN network (end devices of class A and C), and work in a closed group using a point-to-point or star scheme.

Thanks to its record low consumption of 790 nA in sleep mode, SAM R34/35 can be used in stand-alone devices that can run for years on a single set of batteries. On a single chip with a size of only 6x6 mm (BGA 0,65 mm), you can implement a complete IoT device. To communicate with the outside world, ATSAMR34/ATSAMR35 has a large number of interfaces - ADC 12-bit, 2 comparators, USB and up to 5 serial ports, each of which can be configured as USART, I2C, SPI or LIN.

For ATSAMR34/ATSAMR35 chips, a free Microchip LoRaWAN stack is offered as part of the Atmel Studio 7.0 development environment. Code examples are included with the Advanced Software Framework (ASF). For the hardware developer, a wiring diagram with the necessary piping and a reference wiring design for a 4-layer PCB are provided.

Features of ATSAMR34/ATSAMR35:

compact chip Cortex M0+ MCU & LoRa Radio;
package 6x6 mm BGA, 64 pins;
up to 256 KB Flash for code and stack;
up to 40 KB RAM, including 8 KB LP-RAM;
output power up to 20 dBm (100 mW);
energy efficient PA up to +13 dBm (20 mW);
sensitivity up to -136 dBm (LoRaWAN);
sensitivity down to -148 dBm (narrowband);
radio link budget up to 168 dB;
consumption in receive mode 17 mA (typ);
LoRa modulation, (G)FSK, (G)MSK and OOK.

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