NXP Semiconductors K32W041AK

Overview

K32W041AK from NXP Semiconductors is an ultra-low-power Arm® Cortex®-M4 wireless microcontroller supporting concurrent IEEE 802.15.4 and Bluetooth Low Energy 5.0 protocols, operating at up to 48 MHz with 640 KB Flash and 152 KB SRAM. It integrates a +15 dBm 2.4 GHz transceiver, 10-channel PWM, dual I²C/USART/SPI interfaces, and a DMIC subsystem for voice-enabled smart locks and sensor nodes powered by coin-cell batteries.

For engineers reviewing the K32W041AK datasheet, K32W041AK pinout, K32W041AK application, or K32W041AK equivalent, this page delivers verified radio sensitivity (−100 dBm for 802.15.4), deep power-down current (350 nA), AES-256 security engine, antenna diversity control, and HVQFN40 package details - all critical for battery-powered Zigbee/Thread/BLE edge node design.

Technical Context

The K32W041AK implements a dual-protocol radio architecture with independent IEEE 802.15.4 and BLE 5.0 PHY/MAC layers, enabling simultaneous stack operation without external coexistence circuitry. Its integrated RF balun, 32 MHz XTAL oscillator with internal capacitors, and dedicated low-power timers synchronized to the BLE link layer ensure timing-critical radio duty cycling.

On-chip peripherals include a 12-bit ADC with 8 input channels, dual-channel PDM microphone interface with hardware voice activity detection, and a 19-channel DMA engine supporting chained transfers between SRAM and peripherals - reducing CPU load during sensor data acquisition and OTA firmware updates.

Key Specifications

Pinout & Package

Package: 40-pin HVQFN (6 × 6 mm, 0.5 mm pitch), lead-free and RoHS compliant, with exposed die pad connected to RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wireless MCU applications.

Compared with EFR32MG21A020F1024IM32 and CC2652R1F, the K32W041AK uniquely delivers concurrent BLE 5.0 and IEEE 802.15.4 operation in a single chip with hardware MAC accelerators, making it optimal for interoperable smart home hubs and multi-standard edge devices requiring minimal BOM count and unified firmware development.

Availability

K32W041AK is available at Aetrix Electronics and suitable for smart lock systems, wireless thermostat sensors, Zigbee lighting controllers, and voice-enabled switches requiring stable component supply across industrial and consumer IoT production programs.

Supply support for K32W041AK 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with over 30 years of embedded systems expertise.

The K32W series targets ultra-low-power wireless edge nodes, designed specifically to unify Zigbee, Thread, and Bluetooth Low Energy in resource-constrained, battery-operated applications - accelerating time-to-market for certified smart home products.

FAQ

What wireless protocols does the K32W041AK support simultaneously?

The K32W041AK supports IEEE 802.15.4 and Bluetooth Low Energy 5.0 concurrently in hardware, enabling true dual-stack operation for Zigbee 3.0, Thread, and BLE mesh networks without external coexistence circuitry. This capability is confirmed in the NXP K32W041A/K32W041AM datasheet Rev. 1.2, Section 1 and 2.2. The K32W041AK leverages dedicated MAC accelerators and antenna diversity control to maintain both protocol stacks independently.

What is the deep power-down current of the K32W041AK and how is it achieved?

The K32W041AK achieves a deep power-down current of 350 nA with wake-up capability via GPIOs, as specified in Section 2.2 of the official datasheet. This ultra-low state disables the CPU, flash, and most peripherals while retaining RAM retention and enabling wake-up from selected I/O pins or low-power timers. The K32W041AK uses an integrated ultra-low-power sleep oscillator and optimized power management controller to sustain this current level across the −40 °C to +85 °C ambient range.

Does the K32W041AK include hardware security features for secure firmware updates?

Yes, the K32W041AK integrates a dedicated AES-128/192/256 encryption engine and SHA-256 hash accelerator, enabling authenticated and encrypted Over-The-Air (OTA) firmware updates without CPU intervention. These hardware security blocks are documented in Sections 2.2 and 2.3 of the datasheet and support secure boot, key derivation, and cryptographic signing verification - essential for protecting K32W041AK-based devices against unauthorized firmware modification.

What is the package type and pin count of the K32W041AK?

The K32W041AK uses a 40-pin HVQFN package measuring 6 × 6 mm with 0.5 mm pitch, as confirmed in Table 1 (Ordering Information) and Figure 3 (Pin Configuration) of the NXP datasheet Rev. 1.2. It features an exposed die pad that must be connected to the RF ground plane for thermal and electrical performance. This compact RoHS-compliant package supports high-density PCB layouts typical in smart home end devices.

How many ADC input channels does the K32W041AK support and what is its resolution?

The K32W041AK supports eight 12-bit ADC input channels (ADC0–ADC5 plus two additional inputs), with a maximum sampling rate of 190 ksamples/s, as stated in Section 2.3 of the datasheet. The ADC supports hardware-triggered conversions, continuous mode, and DMA-linked operation to minimize CPU overhead during sensor data acquisition - a key capability for K32W041AK implementations in environmental monitoring and smart lock status sensing.