Kinetis® KW21Z-2.4 GHz 802.15.4 Wireless Radio Microcontroller (MCU) based on Arm® Cortex®-M0+ Core

KW21Z

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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.

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Block Diagram

Kinetis® W Series KW21Z MCUs Block Diagram

Kinetis<sup>&#174;</sup> W Series KW21Z MCUs Block Diagram
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Features

802.15.4 Radio

  • IEEE® Std. 802.15.4-2011 Standard Compliant
  • Typical Receiver Sensitivity (802.15.4) = -100 dBm
  • Programmable Transmitter Output Power up to +3.5 dBm

Core and Memories

  • Up to 48 MHz Arm® Cortex®-M0+ core
  • Up to 512 KB Flash memory
  • Up to 128 KB SRAM
  • Excellent coexistence performance
  • Integrated balun to reduce system cost and PCB board area

Low Power Consumption and Operating Voltage Ranges

  • Nine low-power modes to provide power optimization based on application requirements
  • Typical Rx/Tx Current (DC/DC Enabled): 6.8/6.1 mA
  • Bypass Voltage: 1.71V to 3.6V
  • DCDC Converter Buck Configuration: 2.1V to 4.2V
  • DCDC Converter Boost Configuration: 0.9V to 1.795V

Analog modules

  • 16-bit Analog-to-Digital Converter (ADC)
  • 12-bit Digital-to-Analog Converter (DAC)
  • 6-bit High Speed Analog Comparator (CMP)

Security

  • AES-128 Accelerator (AESA), True Random Number Generator (TRNG)

Supported Software

  • Thread
  • Zigbee 3.0
  • Kinetis® Software Development Kit (SDK)
  • FreeRTOS kernel and a bare-metal non-preemptive task scheduler
  • Support for MCUXpresso and IAR

Part numbers include: MKW21Z256VHT4, MKW21Z512VHT4.

Comparison Table

Kinetis KW41Z Family Solutions

Part Number Wireless Connectivity Protocol Memory Package Size Hardware Development Tool
MKW41Z512VHT4 Bluetooth Low Energy and IEEE® 802.15.4 512 KB Flash,
128 KB RAM		 7 mm x 7 mm x 1 mm
48-pin Laminate QFN		 FRDM-KW41Z
USB-KW41Z
MKW41Z256VHT4 256 KB Flash,
64 KB SRAM
MKW41Z512CAT4R 512 KB Flash,
128 KB RAM		 3.9 mm x 3.8 mm
75-pin WLCSP
MKW31Z512VHT4 Bluetooth Low Energy 512 KB Flash,
128 KB RAM		 7 mm x 7 mm x 1 mm
48-pin Laminate QFN
MKW31Z256VHT4 256 KB Flash,
64 KB SRAM
MKW31Z512CAT4R 512 KB Flash,
128 KB RAM		 3.9 mm x 3.8 mm
75-pin WLCSP
MKW21Z512VHT4 IEEE® 802.15.4 512 KB Flash,
128 KB RAM		 7 mm x 7 mm x 1 mm
48-pin Laminate QFN
MKW21Z256VHT4 256 KB Flash,
64 KB SRAM

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