KW45: 32-Bit Bluetooth® 5.3 Long-Range MCUs with CAN FD and LIN Bus Options, Arm® Cortex®-M33 Core

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KW45 Architecture

KW45 Block Diagram

KW45 Device Features

KW45 Software Block Diagram


Application Core

  • Up to 96 MHz Arm Cortex-M33 core
  • 1 MB Program Flash
  • 128 kB SRAM
  • Nested Vectored Interrupt Controller (NVIC)

Radio Core

  • Dedicated CM3 core
  • Secure 256 kB Flash for authenticated NXP Bluetooth Low Energy controller stack firmware
  • 88 kB dedicated SRAM
  • 2.4 GHz Bluetooth Low Energy Version 5.3 upgradeable radio supporting up to 24 simultaneous hardware connections in any central/peripheral combination
  • –106 dBm 125 kbps Long Range Receive Sensitivity
  • –102 dBm 500 kbps Long Range Receive Sensitivity
  • –97.5 dBm 1 Mbps Receive Sensitivity
  • –95 dBm 2 Mbps Receiver Sensitivity
  • Programmable Transmit Output Power up to +10 dBm
  • Data Rates: 125 kbps, 500 kbps, 1 Mbps and 2 Mbps
  • Modulation Types: 2 Level FSK, GFSK, MSK, GMSK
  • On-chip balun with single ended bidirectional RF port

EdgeLock Secure Enclave

  • Secure boot and debug
  • Symmetric Key Encryption - AES-128/192/256 and ECB, CBC, CTR, GCM, CMAC, and CCM Modes
  • Asymmetric Key Encryption - ECC NIST P–192/224/256/384/521, Curve25519
  • Key Exchange algorithms - ECDH(E), SPAKE2+, JPAKE
  • Secure Key Generation, Storage and Management
  • Flash access protection and optional encryption on-the-fly decryption using a PRINCE XEX block cipher mode

Low Power Consumption

  • Transceiver current (DC-DC buck mode, 3.3 V supply)
    • Typical RX: 4.7 mA
    • Typical TX at 0 dBm: 4.6 mA and 18.7 mA at 10 dBm
  • Multiple power-down modes supporting currents as low as 300 nA
  • Ultra-low leakage Smart Power Switch with less than 100 nA sleep current with exit from internal timer or GPIO


  • 32 MHz supported for Bluetooth LE and Generic FSK modes
  • 32.768 kHz Crystal Oscillator

Operating Characteristics

  • Temperature range (ambient): –40 °C to 105 °C •
  • Temperature range (junction): –40 °C to 125 °C • DC/DC voltage range: 1.8 V to 3.6 V
  • Bypass voltage range: 1.8 V to 3.6 V
  • Qualification: AEC-Q100 Grade 2

Human-Machine Interface

  • 22 General-purpose input/output (GPIO) (40HVQFN)
  • 29 GPIO (48HVQFN)

System Peripherals

  • DC/DC converter supporting buck and bypass operating modes
  • Asynchronous DMA controller with per channel access permissions (secure/non-secure)
  • Wake-up unit for power-down modes

Analog Modules

  • 16-bit single ended SAR analog-to-digital converter (ADC) up to 2 Msps
  • Two high-speed analog comparators (CMP) with 8-bit digital-to-analog converter (DAC)
  • 1.0 V to 2.1 V Voltage Reference (Vref)


  • Two 6-channel 32-bit timers (TPM) with PWM capability and DMA support
  • Two 32-bit low-power timers (LPTMR) or pulse counters with compare features
  • 4-channel 32-bit low-power periodic interrupt timer (LPIT) with DMA support
  • One 56-bit timestamp timer
  • 32-bit seconds real time counter (RTC) with 32-bit alarm and independent power supply
  • Signal frequency analyzer (SFA) provides facilities for measurement of clock period/frequency as well as time between triggers

Communication Interfaces

  • FlexCAN with CAN and CAN FD supporting the full implementation of the CAN Specification Version 2.0, Part B. FD Support
  • Two Low Power UART (LPUART) modules with LIN support
  • Two Low Power SPI modules and one MIPI-I3C module
  • Two Low Power I2C (LPI2C) modules supporting the System Management Bus (SMBus) Specification, version 2
  • One programmable FlexIO module supporting emulation of UART, I2C, SPI, Camera IF, LCD RGB, PWM/ Waveform generation


  • 6 x 6 mm 40HVQFN with “Wettable” flanks
  • 7 x 7 mm 48HVQFN with “Wettable” flanks

Part numbers include: KW45B41Z52AFPBT, KW45B41Z52AFTBT, KW45B41Z53AFPBT, KW45B41Z53AFTBT, KW45B41Z82AFPBT, KW45B41Z82AFTBT, KW45B41Z83AFPBT, KW45B41Z83AFTBT, KW45Z41052AFPBT, KW45Z41052AFTBT, KW45Z41053AFPBT, KW45Z41053AFTBT, KW45Z41082AFPBT, KW45Z41082AFTBT, KW45Z41083AFPBT, KW45Z41083AFTBT.


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