NXP Semiconductors MKL24Z32VFM4

Overview

MKL24Z32VFM4 from NXP Semiconductors (formerly Freescale) is a 32-bit ARM Cortex-M0+ microcontroller optimized for ultra-low-power embedded applications. It operates at up to 48 MHz, integrates 32 KB flash and 4 KB SRAM, supports USB Full/Low-Speed On-The-Go with on-chip transceiver, and delivers 47 μA/MHz run power consumption in very low power run mode. It is used in battery-powered sensor nodes and portable medical devices requiring deterministic real-time control and USB connectivity.

For engineers reviewing the MKL24Z32VFM4 datasheet, MKL24Z32VFM4 pinout, MKL24Z32VFM4 application, or MKL24Z32VFM4 equivalent, key selection criteria include its 32-pin QFN package, -40°C to 105°C operating range, 1.71–3.6 V supply, integrated 12-bit SAR ADC and analog comparator with 6-bit DAC, and nine configurable low-power modes including VLLS0 with 0.12 μA typical current draw.

Technical Context

The MKL24Z32VFM4 implements an ARM Cortex-M0+ core with Bit Manipulation Engine (BME) and Micro Trace Buffer (MTB) for efficient code execution and debug visibility. Its clock system includes a multi-purpose MCG module supporting FEI, FBE, BLPI, and PEE modes, with internal 4 MHz IRC and 32 kHz LPO, plus external crystal support from 32 kHz to 40 kHz or 3–32 MHz.

System-level integration includes a 4-channel DMA controller servicing up to 63 request sources, a low-leakage wakeup unit, COP watchdog, and SWD debug interface. Peripheral sets are partitioned across power domains to enable selective clock gating - critical for achieving sub-microamp stop-mode currents while retaining full state in RAM and RTC.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with KL25Z32VFM4 and STM32F042F4P6, MKL24Z32VFM4 offers the lowest VLLS0 current (0.12 μA), integrated USB regulator, and broader temperature range (-40°C to 105°C), making it optimal for long-life, thermally demanding, USB-connected edge sensors.

Availability

MKL24Z32VFM4 is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, USB human interface devices, and smart home controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MKL24Z32VFM4 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 focused on secure connectivity solutions for automotive, industrial, IoT, mobile, and communication infrastructure markets.

The Kinetis KL24 family targets entry-level 32-bit microcontroller applications demanding ultra-low power, USB connectivity, and robust analog integration - designed specifically for cost-sensitive, battery-operated embedded systems.

FAQ

What is the maximum operating frequency of the MKL24Z32VFM4?

The MKL24Z32VFM4 features an ARM Cortex-M0+ core rated for up to 48 MHz operation. This maximum frequency is achievable when the system clock is configured in PEE mode using an external crystal or oscillator, and all voltage and temperature conditions meet specification limits (1.71–3.6 V supply, -40°C to 105°C). The MKL24Z32VFM4 maintains full peripheral functionality at this speed, including USB, ADC, and timers.

Does the MKL24Z32VFM4 support crystal-less USB operation?

No, the MKL24Z32VFM4 does not support crystal-less USB operation. It requires an external 32 MHz crystal connected to the XTAL/EXTAL pins for full-speed USB functionality. Unlike the later KL25Z variant, the MKL24Z32VFM4 lacks the internal USB PLL capable of generating the precise 48 MHz clock needed for USB without an external crystal.

What is the minimum supply voltage for the MKL24Z32VFM4 to retain full RAM state in low-power modes?

The MKL24Z32VFM4 retains full RAM state down to 1.2 V on the VDD supply rail, as specified by the VRAM parameter in the datasheet. Below this voltage, RAM contents are not guaranteed. In VLLS0 mode, the MKL24Z32VFM4 achieves 0.12 μA typical current draw while preserving all registers and SRAM - making it suitable for applications requiring instant wake-from-sleep with zero initialization overhead.

How many GPIO pins are available on the MKL24Z32VFM4 in its 32-pin QFN package?

The MKL24Z32VFM4 provides 23 general-purpose I/O pins in its 32-pin QFN (VFM4) package. These are distributed across PORTA (12 pins), PORTB (2 pins), PORTC (8 pins), and PORTD (7 pins), with some pins shared with alternate functions such as USB, UART, SPI, I²C, and ADC inputs. All 23 pins support configurable pull-up/pull-down resistors, slew rate control, and digital filtering.

Is the MKL24Z32VFM4 RoHS compliant and lead-free?

Yes, the MKL24Z32VFM4 is RoHS compliant and manufactured with lead-free packaging. Its 32-pin QFN package uses matte tin (Sn) termination and conforms to JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), with peak reflow temperature rated at 260°C for lead-free processes. Full compliance documentation, including substance declarations and test reports, is available through NXP's official product pages and Aetrix Electronics' material certifications portal.