KW39/38/37 Wireless Microcontrollers NXP Semiconductors KW39/38/37 Wireless Microcontrollers include the KW39, KW38, and KW37 families of devices. These MCUs are highly integrated single-chip devices that enable Bluetooth® Low Energy (BLE) and generic FSK connectivity for automotive and industrial embedded systems. These KW39/38/37 are fully AEC Q100 Grade 2 automotive and industrial qualified. The KW39/38/37 wireless MCUs integrates with Arm® Cortex®-M0, CPU with up to 512KB flash, and 64KB SRAM. These MCUs feature -30dBm to +5dBm programmable transmitter output power, low external component count for low-cost application, and on-chip balun with single-ended bidirectional RF port.