NXP Semiconductors FRDM-KW40Z

Overview

FRDM-KW40Z from NXP Semiconductors (formerly Freescale) is a Freedom development board built around the MKW40Z ultra-low-power SoC in a 48-pin LGA package, integrating an ARM Cortex-M0+ MCU with dual-mode IEEE 802.15.4 and Bluetooth Low Energy (BLE) v4.1 radio transceiver operating at 2.4 GHz. It includes 32 MHz and 32.768 kHz crystal oscillators, 2-Mbit serial flash, FXOS8700CQ six-axis sensor, and OpenSDA v2.1 debug interface - enabling rapid prototyping of wireless sensor nodes and BLE/802.15.4 edge devices.

For engineers reviewing the FRDM-KW40Z datasheet, FRDM-KW40Z pinout, FRDM-KW40Z application, or FRDM-KW40Z equivalent, this page delivers verified board-level specifications, power configuration options (Bypass/Buck/Boost), RF performance metrics (-102 dBm 802.15.4 sensitivity, -91 dBm BLE sensitivity), regulatory compliance (FCC/CE/UL/RoHS), and hardware interfaces including SPI flash, I²C sensor, ADC potentiometer, IR blaster, and configurable power measurement headers.

Technical Context

The FRDM-KW40Z implements a complete evaluation platform for the MKW40Z SoC, featuring integrated RF circuitry with differential RF I/O port, onboard inverted-F PCB antenna and SMA connector for conducted measurements, and DC-DC converter supporting Bypass (1.8–3.6 V), Buck (1.8–4.2 V), and Boost (0.9–1.8 V) modes. Its OpenSDA v2.1 debug adapter uses a Kinetis K20 (ARM Cortex-M4) MCU to deliver mass-storage-device flash programming, virtual COM port, and CMSIS-DAP debugging over USB.

Board-level peripherals include AT45DB021E 2-Mbit SPI flash for Over-the-Air Programming (OTAP), FXOS8700CQ six-axis accelerometer/magnetometer on I²C, piezoelectric buzzer driven by PTB3 PWM, 5 kΩ potentiometer routed to ADC0_SE, and IR transmitter with ~10 m range and 100 mA active current - all powered via configurable 3.3 V distribution headers (J8, J20, J21).

Key Specifications

Availability

FRDM-KW40Z is available at Aetrix Electronics and suitable for wireless sensor node development, BLE gateway prototyping, IEEE 802.15.4 mesh network evaluation, and low-power IoT device validation requiring stable component supply and full regulatory-compliant reference hardware.

Supply support for FRDM-KW40Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division and later merged with Freescale Semiconductor in 2015, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The FRDM-KW40Z belongs to NXP's Freedom development platform family, designed specifically to accelerate software and hardware co-development for ultra-low-power wireless MCUs targeting medical body area networks (MBAN), smart home sensors, and industrial telemetry systems.

FAQ

What is the primary function of the FRDM-KW40Z development board?

The FRDM-KW40Z development board serves as a fully integrated evaluation and prototyping platform for the MKW40Z SoC. It enables engineers to validate dual-mode wireless functionality (BLE v4.1 and IEEE 802.15.4), develop firmware using OpenSDA-based CMSIS-DAP debugging, and test peripheral integration including SPI flash, I²C sensor, ADC inputs, and IR control - all without external toolchain dependencies beyond standard USB connectivity. The FRDM-KW40Z supports both standalone operation and daughter-card expansion within the Freedom ecosystem.

Does the FRDM-KW40Z support Over-the-Air Programming (OTAP)?

Yes, the FRDM-KW40Z supports Over-the-Air Programming via its onboard AT45DB021E 2-Mbit serial flash memory, which is connected through an SPI interface and powered by the P3V3_BRD rail. This flash is explicitly designated in the User's Guide for storing non-volatile system data, parameters, and firmware updates delivered wirelessly over BLE or 802.15.4 links. The FRDM-KW40Z hardware provides dedicated SPI routing and discrete pull-up resistors to ensure reliable OTAP implementation in production-like environments.

How does the FRDM-KW40Z handle power management and current measurement?

The FRDM-KW40Z offers three DC-DC operating modes - Bypass, Buck, and Boost - selectable via jumper headers (J16–J22), each supporting distinct input voltage ranges (e.g., Buck: 1.8–4.2 V; Boost: 0.9–1.8 V). Current measurement is enabled through dedicated 2-pin headers: J8 for board peripherals, J20 for LED power, and J21 for MKW40Z SoC supply. Removing the jumper and inserting a multimeter allows precise current profiling per subsystem - a capability confirmed in Section 4.2.3 of the official FRDMKW40ZUG Rev. 2 document.

What RF performance metrics are validated for the FRDM-KW40Z board?

The FRDM-KW40Z board has documented RF performance including -102 dBm receiver sensitivity for IEEE 802.15.4 (1% PER, 25 °C, at SMA connector), -91 dBm sensitivity for BLE, programmable output power from -20 dBm to +5 dBm (at SMA, no harmonic trap), and 2nd/3rd harmonic suppression ≤40 dBm. These values are specified in Table 1 of the User's Guide and reflect conducted measurements using the onboard SMA port - confirming the board meets FCC Part 15 and ETSI EN 300 328 regulatory requirements for intentional radiators.

Can the FRDM-KW40Z be used as a daughter card or mother board in larger systems?

Yes, the FRDM-KW40Z is explicitly designed for flexible integration: it functions as a standalone evaluation platform, a daughter card for other Freedom development boards (via standard 0.1″ headers J1–J4), or a mother board for application-specific shield cards (using its Freedom-compatible mounting interface). This multi-role capability is stated in Section 4.1 and illustrated in Figure 4 of the FRDMKW40ZUG Rev. 2 guide, making the FRDM-KW40Z adaptable across early prototyping, subsystem validation, and modular system architecture development.