NXP Semiconductors MKL17Z256VFM4

Overview

MKL17Z256VFM4 from NXP Semiconductors is a 48 MHz ARM® Cortex®-M0+ microcontroller with 256 KB flash, 32 KB SRAM, and 16 KB ROM bootloader, designed for ultra-low-power battery-operated systems. It delivers 54 µA/MHz in very low power run mode, 1.96 µA in VLLS3 deep sleep (RAM + RTC retained), and supports 28 GPIOs in a 32-pin QFN package - used in portable medical sensors and smart utility meters.

For engineers reviewing the MKL17Z256VFM4 datasheet, MKL17Z256VFM4 pinout, MKL17Z256VFM4 application, or MKL17Z256VFM4 equivalent, key selection criteria include its 48 MHz Cortex-M0+ core, integrated FlexIO for custom serial peripheral emulation, dual low-power UARTs enabling always-on communication, and verified operation across –40 to 105 °C in QFN packaging.

Technical Context

The MKL17Z256VFM4 implements a tightly coupled M0+ core with Micro Trace Buffer and Bit Manipulation Engine, paired with an MCG-Lite clock system supporting HIRC (48 MHz ±0.5%), LIRC (8/2 MHz), and crystal oscillators (32 kHz–32 MHz). Its low-power architecture includes six static power modes - VLLS0 through RUN - with sub-µA retention states enabled by dedicated low-leakage wakeup units and configurable voltage references.

Peripherals are partitioned into always-on (RTC, LPTMR, CMP) and domain-gated blocks (ADC, SPI, I2C), with FlexIO providing runtime-configurable serial interface emulation (UART/I2C/SPI/I2S/PWM) without additional silicon area. The ADC features 16-channel SE/DP input, 818 ksps sampling, and internal 1.2 V reference with <±1 LSB INL.

Key Specifications

Pinout & Package

Package: 32-pin QFN, 5 mm × 5 mm, 0.5 mm pitch, 0.65 mm height, exposed thermal pad. RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KL27Z256VLH4 and STM32L072KBU6, MKL17Z256VFM4 offers optimal balance of ultra-low-power operation (1.96 µA VLLS3), FlexIO-driven peripheral scalability, and compact 32-pin QFN footprint - making it the most cost-effective choice for battery-powered edge nodes where pin count and power budget are critical constraints.

Availability

MKL17Z256VFM4 is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial wireless sensor nodes, and home automation controllers requiring stable component supply across extended product lifecycles.

Supply support for MKL17Z256VFM4 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 40 years of microcontroller innovation.

The Kinetis KL17 series targets cost-sensitive, battery-powered applications demanding robust low-power performance and flexible peripheral integration - specifically engineered for intelligent edge endpoints in energy metering, wearables, and predictive maintenance systems.

FAQ

What is the maximum operating frequency and core type of the MKL17Z256VFM4?

The MKL17Z256VFM4 features an ARM Cortex-M0+ core rated for operation up to 48 MHz. This frequency is achievable using the internal high-accuracy reference clock (HIRC) with ±0.5% tolerance, eliminating the need for an external crystal in many applications. The MKL17Z256VFM4 maintains full peripheral functionality at this speed, including ADC sampling at 818 ksps and SPI transfers up to 24 Mbit/s.

Does the MKL17Z256VFM4 support in-system programming and debugging?

Yes, the MKL17Z256VFM4 supports in-system programming and debugging via a two-pin Serial Wire Debug (SWD) interface using SWD_CLK and SWD_DIO pins. It also includes a factory-programmed 16 KB ROM bootloader accessible through UART or USB HID, enabling field firmware updates without external debug hardware. The MKL17Z256VFM4 integrates a Micro Trace Buffer for real-time instruction tracing during development.

What low-power modes does the MKL17Z256VFM4 offer, and what is the lowest current draw?

The MKL17Z256VFM4 provides six low-power modes: RUN, WAIT, STOP, VLPS, LLS, and three VLLS variants. Its lowest active-retention current is 1.96 µA in VLLS3 mode with RAM and RTC retained at 3.0 V and 25 °C. This value is confirmed in the official NXP datasheet Rev. 7 (10/2023) and applies specifically to the MKL17Z256VFM4 in its 32-pin QFN package.

How many GPIOs and analog input channels does the MKL17Z256VFM4 provide?

The MKL17Z256VFM4 provides 28 general-purpose I/O pins in its 32-pin QFN package, including 19 interrupt-capable and 6 high-drive (25 mA) pins. It supports up to 11 single-ended or 2 differential analog input channels on its 16-bit ADC, with dedicated VREFH/VREFL pins and internal 1.2 V reference for ratiometric measurements.

Is the MKL17Z256VFM4 compatible with external 32.768 kHz crystals for RTC operation?

Yes, the MKL17Z256VFM4 supports external 32.768 kHz crystals via dedicated XTAL32 and EXTAL32 pins, enabling precise real-time clock operation with typical ±20 ppm accuracy. The crystal oscillator circuit is fully integrated, requiring only two 12 pF load capacitors. This configuration is validated for use in VLLS1 and VLLS3 modes, ensuring timekeeping continuity during ultra-low-power sleep states in the MKL17Z256VFM4.