Wireless MCU selection Guide for IoT
User Data Rate vs Distance
- LORA -15km 150kbps
- BLE 4.0 -10m 0.3mbps
- WIFI -200m 160mbps
- BT - 10m 1.2mbps
Range or Speed
- If you want a better range, use 2.4 GHz.
- If you need higher performance or speed, use the 5GHz band.
- the 5GHz band, which is the newer of the two, has the potential to cut through network clutter and interference to maximize network performance.
Power Usage
- Wi-Fi > BT > BLE > LORA
Wireless Standards
- Radiation levels – some countries do not allow some wireless MCUs
- Biomedical standards
- Environmental standards
- EMI standards
- ISO standards
- MCU Package size
- Operating temperature
Application
- automotive, industrial, maritime, biomedical or harsh environments
Other cellular technologies for IoT products
- GPRS
- 3G
- 4G
Operating voltage, power usage
- Low power application, normal application 8-30 MHz or high-performance applications 100MHz - 4 GHz range
- Clocking speed
- RAM (runtime memory space)
- Flash size (program space)
- GPIO – number of following should be considered
- Digital inputs
- Digital outputs
- ADC inputs
- DAC outputs
- Communication ports
- I2C ports (multiple required when you have different i2c clock speeds or external component cost-reducing on heavy used i2c bus –when many slaves connected to the single bus)
- SPI ports
- Serial ports (UART) - also useful for serial debugging
- Inbuild USB port
- CAN bus ports
- Timers
- Watchdog timers
- Interrupt's availability according to requirements
- OTP – over the air program capability
- Mesh network capability
Antenna type
- UFL
- PCB chip antenna
- PCB trace antenna
Popular wireless SOC
- Esp32
- TI Wi-Fi SOC
- TI BLE SOC
Popular wireless chips/brands
- TI
- Semtech
- ESPRESSIF
- Nordic Semiconductor
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