Note: JN5189/88T is preferred for any new Zigbee®, Thread
design. No new software releases planned
The KW21Z is an ultra-low-power, highly-integrated single-chip device that enables IEEE® 802.15.4 RF
connectivity for portable, extremely low-power embedded systems. Applications include portable healthcare devices,
access control, security systems, smart energy and home area networks.
The KW21Z Wireless MCU integrates a 2.4 GHz transceiver supporting O-QPSK modulations, an Arm®
Cortex®-M0+ CPU, up to 512 KB Flash and up to 128 KB SRAM, 802.15.4 packet processor, hardware
security and peripherals optimized to meet the requirements of the target applications. The KW21Z is an ideal
solution for single-chip Thread and Zigbee devices including routers and end devices as well as border routers and
Coordinators when adding connectivity for communicating with the cloud.