An Application-Driven Modular IoT Architecture

Table 2

Comparison of low-power microcontrollers.

Characteristic	Arduino; Pro Mini	NUCLEO-F401RE	ATmega32U4	ATtiny10	CC2640	MSP430-F2410	Adafruit Pro Trinket	Adafruit FLORA
CPU	ATmega328	STM32-Cortex M4	AVR	ATtiny10	ARM Cortex M3	MSP430	ATmega328	ATtiny85
Built-in transceiver					BLE or ZigBee
ADC: size (bits), samples/s	10, –	16, 2400	10, 15 k	8, 15	12, 200 k	12, –	10, –	10, –
Clock speed (MHz)	20	84	16	12	48	16	12	8
Bus width (bits)	8	32	8	8	16	16	8
Memory (kB)	32	512	32	1	128	56	28	8
I/O connectivity	UART, I2C, SPI	UART, I2C, SPI	UART, I2C, SPI	ISP	UART, SPI, I2C, GPIO	UART, IrDA, I2C, GPIO, SPI	UART, I2C, SPI	UART
Real-time clock
Coin cell battery operation