原标题：NXP KW41Z 2.4GHz双模式无线MCU开发方案

　　NXP公司的KinetisKW41Z是基于ARM® Cortex®-M0+核的2.4GHz双模式BLE和802.15.4无线微控制器(MCU),支持同时运行Bluetooth®低能耗(BLE) v4.2和基于IEEE® 802.15.4的Thread协议,具备足够存储容量(512 KB闪存和128 KB SRAM),可运行所有应用程序,是经济高效的解决方案,并降低了设计成本和设计复杂性,减小了产品的整体尺寸.可用在物联网设备之间安全可靠通信.本文介绍了KW41Z主要特性,框图,FRDM-KW41Z Freedom开发板主要特性,框图和电路图.

　　The KW41Z/31Z/21Z (called KW41Z throughout this document) is an ultra lowpower,highly integrated single-chip device that enables Bluetooth low energy (BLE),Generic FSK (at 250, 500 and 1000 kbps) or IEEE Standard 802.15.4 RF connectivityfor portable, extremely low-power embedded systems. Applications include portablehealth care devices, wearable sports and fitness devices, AV remote controls,computer keyboards and mice, gaming controllers, access control, security systems,smart energy and home area networks.

　　The KW41Z SoC integrates a radio transceiver operating in the 2.36 GHz to 2.48 GHz　range supporting a range of FSK/GFSK and O-QPSK modulations, an ARM Cortex-M0+ CPU, up to 512 KB Flash and up to 128 KB SRAM, BLE Link Layer hardware,802.15.4 packet processor hardware.

　　The KW41Z SoC’s radio frequency transceiver is compliant with Bluetooth version4.2 for Low Energy (aka Bluetooth Smart or BLE), Generic FSK and the IEEEStandard 802.15.4 using O-QPSK in the 2.4 GHz ISM band. NXP provides fullycertified Bluetooth Low Energy and IEEE Standard 802.15.4 protocol stacks,including Thread, and application profiles to support KW41Z.

　　The KW41Z SoC can be used in applications as a "BlackBox" modem by simplyadding BLE or IEEE Standard 802.15.4 connectivity to an existing embeddedcontroller system, or used as a stand-alone smart wireless sensor with embeddedapplication where no host controller is required.

　　KW41Z has 512/256 KB of on-chip Flash and 128/64 KB of on-chip SRAM memoryavailable to be used by customer applications and chosen communication protocolstack using a choice of either NXP or 3rd party software development tools.

　　The RF section of the KW41Z SoC is optimized to require very few externalcomponents, achieving the smallest RF footprint possible on a printed circuit board.

　　Extremely long battery life is achieved though efficiency of code execution in theCortex-M0+ CPU core and the multiple low power operating modes of the KW41ZSoC. Additionally, an integrated DC-DC converter enables a wide operating rangefrom 0.9 V to 4.2 V. The DC-DC in Buck mode enables KW41Z to operate from asingle coin cell battery with a significant reduction of peak Rx and Tx currentconsumption. The DC-DC in boost mode enables a single alkaline battery to be usedthroughout its entire useful voltage range of 0.9 V to 1.795 V.

　　KW41Z主要特性:

　　Multi-Standard Radio

　　• 2.4 GHz Bluetooth Low Energy ver. 4.2 compliantsupporting up to 2 simultaneous hardware connections

　　• IEEE Std. 802.15.4 compliant with dual-PAN support

　　• Generic FSK modulation

　　• Data Rate: 250, 500 and 1000 kbps

　　• Modulations: GFSK BT = 0.3, 0.5, 0.7; FSK/MSK

　　• Modulation Index: 0.32, 0.5, or 0.7

　　• Typical Receiver Sensitivity (BLE) = -95 dBm

　　• Typical Receiver Sensitivity (802.15.4) = -100 dBm

　　• Typical Receiver Sensitivity (250 kbps GFSK-BT=0.5,h=0.5) = -100 dBm

　　• Prog Transmitter Output Power: -30 dBm to 3.5 dBm

　　• Low external component counts for low cost application

　　• On-chip balun with single ended bidirectional RF port

　　MCU and Memories

　　• Up to 48 MHz ARMR Cortex-M0+ core

　　• On-chip 512/256 KB Flash memory

　　• On-chip 128/64 KB SRAM

　　Low Power Consumption

　　• Transceiver current (DC-DC buck mode, 3.6 V supply)

　　• Typical Rx Current: 6.8 mA

　　• Typical Tx current: 6.1 mA (0 dBm output)

　　• Low Power Mode (VLLS0) Current: 182 nA

　　Clocks

　　• 26 and 32 MHz supported for BLE and FSK modes

　　• 32 MHz supported for IEEE Standard 802.15.4

　　• 32.768 kHz Crystal Oscillator

　　Operating Characteristics

　　• Voltage range: 0.9 V to 4.2 V

　　• Temperature range: –40 to 105℃

　　Human-machine interface

　　• Touch sensing input

　　• General-purpose input/output

　　System peripherals

　　• Nine MCU low-power modes to provide poweroptimization based on application requirements

　　• DC-DC Converter supporting Buck, Boost, andBypass operating modes

　　• Direct memory access(DMA) Controller

　　• Computer operating properly(COP) watchdog

　　• Serial wire debug(SWD) Interface and Micro Tracebuffer

　　• Bit Manipulation Engine (BME)

　　Analog Modules

　　• 16-bit Analog-to-Digital Converter (ADC)

　　• 12-bit Digital-to-Analog Converter (DAC)

　　• 6-bit High Speed Analog Comparator (CMP)

　　• 1.2 V voltage reference (VREF)

　　Timers

　　• 16-bit low-power timer (LPTMR)

　　• 3 Timers Modules(TPM): One 4 channel TPM andtwo 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 module

　　• Carrier Modulator Timer (CMT)

　　Security

　　• AES-128 Hardware Accelerator (AESA)

　　• True Random Number Generator (TRNG)

　　• Advanced flash security

　　• 80-bit unique identification number per chip

　　• 40-bit unique media access control (MAC) subaddress

　　• Bluetooth-LE v4.2 Secure Connections

　　• IEEE Standard 802.15.4-2011 compliant security

　　图1.KW41Z框图

　　FRDM-KW41Z Freedom开发板

　　This user’s guide describes the hardware for the FRDM-KW41Z Freedom development board. The FRDM-KW41Z Freedom development board is a small, low-power, and cost-effective evaluation and development board for application prototyping and demonstration of the KW41Z/31Z/21Z (KW41Z) family of devices. These evaluation boards offer easy-to-use mass-storage-device mode flash programmer, a virtual serial port, and standard programming and run-control capabilities.

　　The KW41Z is an ultra-low-power, highly integrated single-chip device that enables Bluetooth Low Energy (BLE), Generic FSK (at 250, 500, and 1000 kbps) or IEEE Standard 802.15.4 with Thread support for portable, extremely low-power embedded systems.

　　The KW41Z integrates a radio transceiver operating in the 2.36 GHz to 2.48 GHz range supporting a range of FSK/GFSK and O-QPSK modulations, an ARM® Cortex®-M0+ CPU, up to 512 KB Flash and up to 128 KB SRAM, BLE Link Layer hardware, 802.15.4 packet processor hardware and peripherals optimized to meet the requirements of the target applications.

　　The FRDM-KW41Z development board is an evaluation environment supporting NXP’s KW41Z/31Z/21Z (KW41Z) Wireless Microcontrollers (MCU). The KW41Z integrates a radio transceiver operating in the 2.36 GHz to 2.48 GHz range (supporting a range of FSK/GFSK and O-QPSK modulations) and an ARM Cortex-M0+ MCU into a single package. NXP supports the KW41Z with tools and software that include hardware evaluation and development boards, software development IDE, applications, drivers, custom PHY usable with IEEE Std. 802.15.4 compatible MAC, and BLE Link Layer. The FRDM-KW41Z development board consists of the KW41Z device with a 32 MHz reference oscillator crystal, RF circuitry (including antenna), 4-Mbit external serial flash, and supporting circuitry in the popular Freedom board form-factor. The board is a standalone PCB and supports application development with NXP’s Bluetooth Low Energy, Generic FSK, and IEEE Std. 802.15.4 protocol stacks including Thread.

　　图3.FRDM-KW41Z Freedom开发板外形图

　　FRDM-KW41Z Freedom开发板主要特性:

　　• NXP’s ultra-low-power KW41Z Wireless MCU supporting BLE, Generic FSK, and IEEE Std. 802.15.4 (Thread) platforms

　　• IEEE Std. 802.15.4-2006 compliant transceiver supporting 250 kbps O-QPSK data in 5.0 MHz channels, and full spread-spectrum encoding and decoding

　　• Fully compliant Bluetooth v4.2 Low Energy (BLE)

　　• Reference design area with small-footprint, low-cost RF node:

　　— Single-ended input/output port

　　— Low count of external components

　　— Programmable output power from -30 dBm to +3.5 dBm at the SMA connector, when using DCDC Bypass or operating the DCDC in Buck mode

　　— Receiver sensitivity is -100 dBm, typical (@1 % PER for 20-byte payload packet) for 802.15.4 applications, at the SMA connector

　　— Receiver sensitivity is -95 dBm (for BLE applications) at the SMA connector

　　• Integrated PCB inverted F-type antenna and SMA RF port (requires moving C7 to C8)

　　• Selectable power sources

　　• DC-DC converter with Buck, Boost, and Bypass operation modes

　　• 32 MHz reference oscillator

　　• 32.768 kHz reference oscillator

　　• 2.4 GHz frequency operation (ISM and MBAN)

　　• 4-Mbit (512 kB) external serial flash memory for Over-the-Air Programming (OTAP) support

　　• NXP FX)S8700CQ Digital Sensor, 3D Accelerometer (±2g/±4g/±8g) + 3D Magnetometer

　　• Integrated Open-Standard Serial and Debug Adapter (OpenSDA)

　　• Cortex 10-pin (0.05) SWD debug port for target MCU

　　• Cortex 10-pin (0.05) JTAG port for OpenSDA updates

　　• One RGB LED indicator

　　• One red LED indicator

　　• Two push-button switches

　　• Two TSI buttons (Touch Sensing Input electrodes)

　　图4.FRDM-KW41Z Freedom元件分布图

　　详情请见:

FRDM-KW41Z-SCH.pdf

MKW41Z512.pdf

FRDMKW41ZUG.pdf