STMicroelectronics has a STM32 microcontroller with a 2.4GHz ZigBee radio transceiver on-chip.

Intended for smart metering applications the ARM Cortex-M3-based STM32W family implements the IEEE 802.15.4 physical (PHY) layer as well as the Media Access Control (MAC) layer.

Software support for the STM32W family includes libraries for the latest ZigBee PRO specification, as well as ZigBee RF4CE, and the IEEE 802.15.4 MAC.

The transceiver can transmit up to 7dBm output power and support up to 107dB link budget, achieve up to –100dBm receiver sensitivity, and allow coexistence with nearby Wi-Fi and Bluetooth networks, which also operate in the 2.4GHz frequency band.

The STM32W MCUs are specified with supply currents of 27mA in receive mode and 31mA in transmit mode, and implementing a 1µA Deep-Sleep mode to aid power management.

There is also 8kbyte SRAM, 128kbyte flash for code storage, and embedded AES encryption with hardware acceleration.

General-purpose resources include a flexible ADC, an SPI/UART/TWI serial interface, multiple timers, and 24 GPIOs with Schmitt-trigger inputs. Single-voltage operation from 2.1V to 3.6V simplifies design, while high integration also saves external components.

Only a single 24MHz crystal is required, or an optional 32.768kHz crystal for increased timer accuracy. There is also support for an external power amplifier.