KW39/38/37: 32-Bit Bluetooth 5.0 Long-Range MCUs with CAN FD and LIN Bus Options, Arm® Cortex®-M0+ Core

KW39-38-37

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KW39/38/37 wireless MCUs integrate long-range capability with Bluetooth Low Energy version 5.0 and generic FSK radio. Achieving -105 dBm sensitivity with LE-coded 125 kbit/s data rate allows for connections in harsh environments and at extended distances. The innovative data stream buffer allows the capture of radio parameters without stalling processor or DMA operations. This capability enables high-accuracy measurements needed for distance and angle approximations. The radio supports up to 8 simultaneous secure connections in any leader/follower combination allowing multiple authorized users to communicate with the device. The KW38 MCU additionally integrates FlexCAN, helping enable seamless integration into an automobile’s in-vehicle or industrial CAN communication network. The FlexCAN module can support CAN’s flexible data rate (CAN FD) for increased bandwidth and lower latency.

Block Diagram

KW39/38/37 MCUs Block Diagram

KW39/38/37 MCUs Block Diagram
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Features

MCU and Memories

  • Up to 48 MHz Arm Cortex-M0+ core
  • Nested Vectored Interrupt Controller (NVIC)
  • Wake-up Interrupt Controller (WIC)
  • Single wire debug (SWD) and micro trace buffer
  • KW37: 512KB program flash memory w/ ECC
  • KW39/38
    • 256KB program flash memory plus 256KB FlexNVM w/ ECC
    • 8KB FlexRAM supporting EEPROM emulation
  • On-chip 64KB SRAM
  • Security circuitry to prevent unauthorized access to RAM and flash contents through the debugger

Radio and Features

  • 2.4 GHz Bluetooth Low Energy Version 5.0 radio supporting up to 8 simultaneous hardware connections in any central/peripheral combination
  • Generic FSK modulation:
    • Data Rates: 250, 500 and 1000 kbps
    • Modulations: GFSK BT = 0.3, 0.5, 0.7, 1.0; FSK/MSK
    • Modulation Index: 0.32, 0.5, or 0.7
  • High Speed (2 Mbps), Long Range, Advertising Extensions
  • -98 dBm receiver sensitivity in BLE 1Mbps mode
  • -105 dBm receive sensitivity in BLE long range 125kbps mode
  • -101 dBm typical generic FSK (at 250 kbit/s) sensitivity
  • Programmable Transmitter Output Power: -30 dBm to +5 dBm
  • Low external component counts for low cost application and reduced form factor
  • On-chip balun with single ended bidirectional RF port
  • Supports transceiver range extension using external PA and/or LNA
  • Enhanced Bluetooth LE automatic deep sleep modes (DSM) supporting Peripheral Latency

Low Power Consumption

  • Transceiver current (DC-DC buck mode, 3.6 V supply)
    • Typical Rx current: 6.3 mA
    • Typical Tx current: 5.7 mA @ 0 dBm output
  • Low Power Mode (VLLS0) Current: 250 nA

Clocks

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

Operating Characteristics

  • Voltage range: 1.71 V to 3.6 V
  • Ambient temperature range: –40 to 105 °C
  • AEC Q100 Grade 2 Automotive Qualification (KW39A/38A/37A)
  • Industrial Qualification (KW38Z/37Z)

Human-Machine Interface

  • General-purpose input/output w/ interrupt capability

System peripherals

  • Nine MCU low-power modes to provide power optimization based on application requirements
  • DC-DC Converter supporting Buck and Bypass operating modes
  • Direct memory access (DMA) Controller
  • Computer operating properly (COP) watchdog
  • Serial wire debug (SWD) Interface and Micro Trace buffer
  • Bit Manipulation Engine (BME)

Analog Modules

  • 16-bit Analog-to-Digital Converter (ADC)
  • 6-bit High Speed Analog Comparator (CMP)
  • 1.2 V voltage reference (VREF)

Timers

  • 16-bit low-power timer (LPTMR)
  • 3 Timers Modules(TPM) with PWM capability: One 4- channel TPM and two 2-channel TPMs
  • Programmable Interrupt Timer (PIT)
  • Real-Time Clock (RTC)

Communication interfaces

  • 2 serial peripheral interface (SPI) modules
  • 2 inter-integrated circuit (I2C) modules
  • Low Power UART (LPUART) module with LIN support (2x LPUART on KW38)
  • Carrier Modulator Timer (CMT)
  • FlexCAN module (with CAN FD support up to 3.2 Mbps baudrate) on KW38

Security

  • AES-128 Hardware Accelerator (AESA) with LTC
  • True Random Number Generator (TRNG)
  • Advanced flash security on Program Flash
  • 80-bit unique identification number per chip
  • 40-bit unique media access control (MAC) sub-address
  • LE Secure Connections

Packaging

  • 7 x 7 mm 48HVQFN with “Wettable” flanks and is pin and package compatible with KW36/35/34 family

Part numbers include: MKW37A512VFT4, MKW37Z512VFT4, MKW38A512VFT4, MKW38Z512VFT4, MKW39A512VFT4.

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