NXP Semiconductors MKL15Z128VFM4

Overview

MKL15Z128VFM4 from NXP Semiconductors (formerly Freescale) is a 48 MHz ARM® Cortex®-M0+ based microcontroller in the Kinetis KL15 sub-family, featuring 128 KB flash, 16 KB SRAM, and 28 GPIOs in a 32-pin QFN package. It delivers ultra-low-power operation down to 0.31 µA in VLLS0 mode with full state retention, 4 µs wakeup, and integrated analog peripherals including a 16-bit SAR ADC and 12-bit DAC - ideal for battery-powered sensor nodes and portable HMI devices.

For engineers reviewing the MKL15Z128VFM4 datasheet, MKL15Z128VFM4 pinout, MKL15Z128VFM4 application, or MKL15Z128VFM4 equivalent, this page provides verified technical context, low-power mode behavior, peripheral integration details, and validated alternative options for cost-optimized or feature-extended designs.

Technical Context

The MKL15Z128VFM4 implements an energy-optimized Cortex-M0+ core with clock gating, dynamic voltage scaling, and nine configurable low-power modes - including VLLS0 (0.31 µA), VLPS (3.75 µA), and LLS (1.68 µA) - all supporting full RAM retention and fast wake-up. Its memory subsystem includes zero-wait-state flash with error correction and configurable cache, enabling deterministic real-time execution at up to 48 MHz.

Peripherals are tightly coupled to low-power operation: the TSI touch interface operates in VLPR mode, the 16-bit ADC supports hardware-triggered conversions with programmable resolution, and dual UARTs (including one low-power UART) enable asynchronous communication without waking the core. The MCG clock controller supports multiple internal/external sources - 32 kHz to 32 MHz - with automatic failover and fine-grained frequency tuning.

Key Specifications

Pinout & Package

Package: 32-pin QFN (VFM4), 5 mm × 5 mm × 1 mm, 0.5 mm pitch, exposed thermal pad (EP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MKL15Z128VFM4, MKL25Z128VLH4 offers USB and more I/O but demands layout change, while STM32L072KBU6 trades analog capability and wakeup speed for lower unit cost and broader ecosystem tooling.

Availability

MKL15Z128VFM4 is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical devices, industrial HMI panels, and asset tracking tags requiring stable component supply across long-lifecycle deployments.

Supply support for MKL15Z128VFM4 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 acquired Freescale in 2015 and continues development of the Kinetis portfolio, focusing on secure, low-power microcontrollers for industrial and IoT edge applications.

The Kinetis KL15 family targets cost-sensitive, battery-operated embedded systems requiring robust analog integration, ultra-low-power operation, and ARM Cortex-M0+ software compatibility - especially where migration from legacy 8/16-bit MCUs is needed.

FAQ

What is the maximum operating frequency of the MKL15Z128VFM4 core?

The MKL15Z128VFM4 features an ARM Cortex-M0+ core rated for up to 48 MHz operation. This frequency is achievable with the MCG in PEE mode using an external crystal or internal FLL, and requires VDD ≥ 2.7 V for guaranteed timing compliance across the full –40°C to +105°C temperature range. At lower voltages (1.71–2.7 V), the maximum safe core frequency is reduced per the device's AC electrical specifications.

Does the MKL15Z128VFM4 support USB connectivity?

No, the MKL15Z128VFM4 does not include a USB controller. USB functionality is available in other members of the Kinetis L family such as the MKL25Z128VLH4, which integrates a full-speed USB OTG module. The MKL15Z128VFM4 provides two UARTs (one low-power), two I²C, and two SPI interfaces for wired communication instead.

What is the minimum supply voltage for the MKL15Z128VFM4 to retain full SRAM contents?

The MKL15Z128VFM4 retains full SRAM contents down to 1.2 V on the VDD rail, as specified by the VRAM parameter in the datasheet. Below this threshold, data retention is not guaranteed. In practice, the lowest power stop mode (VLLS0) maintains RAM at 0.31 µA with VDD = 3.0 V, and the device enters reset if VDD falls below the POR threshold (~0.8–1.5 V depending on ramp rate).

How many channels does the ADC in the MKL15Z128VFM4 support, and what is its resolution?

The MKL15Z128VFM4 integrates a single 16-bit SAR ADC with up to 16 configurable input channels. It supports programmable resolution from 8 to 16 bits, configurable conversion speed (up to 1 MSps), and hardware averaging (2x–32x) to improve effective resolution. The ADC operates from the VDDA supply and includes dedicated reference inputs (internal 1.2 V or external).

Is the MKL15Z128VFM4 pin-compatible with other Kinetis KL15 variants like MKL15Z64VFM4?

Yes, the MKL15Z128VFM4 is pin-compatible with all other VFM4-suffixed Kinetis KL15 parts (e.g., MKL15Z32VFM4, MKL15Z64VFM4) in the same 32-pin QFN package. They share identical pin assignments, electrical characteristics, and peripheral mapping - only flash/RAM sizes and ordering codes differ. Firmware built for one can run unmodified on another, provided memory usage stays within the target's capacity.