NXP Semiconductors MKL33Z256VLH4

Overview

MKL33Z256VLH4 from NXP Semiconductors (formerly Freescale) is a 48 MHz ARM® Cortex®-M0+ microcontroller with 256 KB flash, 32 KB SRAM, and integrated segment LCD controller supporting up to 28×8 segments. It delivers 1.96 µA deep-sleep current (VLLS3, RAM + RTC retained), operates from 1.71–3.6 V, and targets ultra-low-power battery-operated metering and HMI devices.

For engineers reviewing the MKL33Z256VLH4 datasheet, MKL33Z256VLH4 pinout, MKL33Z256VLH4 application, or MKL33Z256VLH4 equivalent, key selection criteria include its 64-pin LQFP package, FlexIO-based peripheral emulation capability, low-power UART/I²C/SPI interfaces, and verified 105 °C industrial temperature rating.

Technical Context

The MKL33Z256VLH4 implements a single-core ARM Cortex-M0+ with tightly coupled Micro Trace Buffer and Bit Manipulation Engine for deterministic real-time control. Its clock system integrates factory-trimmed 48 MHz HIRC (±0.5%), 8/2 MHz IRC (±3%), and 32 kHz crystal support - all active across six low-power modes including VLLS0–VLLS3.

Peripherals are partitioned into always-on (RTC, LPTMR, CMP), low-leakage wakeup-capable (UART, I²C, SPI), and LCD-optimized blocks. The FlexIO module enables runtime reconfiguration of serial protocols (UART, I²S, PWM, IrDA) without dedicated hardware, while the 16-bit ADC (818 ksps, 16-channel SE/4-channel DP) uses an internal 1.2 V reference with ±1.5 LSB INL.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch, 1.6 mm height), 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 MKL27Z256VLH4, the MKL33Z256VLH4 adds essential LCD and FlexIO capabilities for HMI-centric designs; versus STM32L072KBU6, it trades slightly higher VLLS3 current for significantly greater LCD segment count and runtime peripheral reconfiguration - critical for field-upgradable metering platforms.

Availability

MKL33Z256VLH4 is available at Aetrix Electronics and suitable for smart utility meters, industrial HMI panels, portable medical devices, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for MKL33Z256VLH4 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, and IoT applications, with roots in Freescale's microcontroller heritage.

The Kinetis KL33 series was designed specifically for cost-sensitive, battery-powered applications demanding integrated segment LCD control and ultra-low-power operation - targeting utility metering, portable instrumentation, and industrial HMI.

FAQ

What is the maximum operating frequency and core architecture of the MKL33Z256VLH4?

The MKL33Z256VLH4 features an ARM Cortex-M0+ core rated for up to 48 MHz operation. This core includes a Micro Trace Buffer for instruction trace and a Bit Manipulation Engine for efficient bit-field operations. All timing specifications - including ADC conversion, UART baud rate generation, and PWM resolution - are validated at this maximum frequency under 1.71–3.6 V supply and –40 to +105 °C conditions. The MKL33Z256VLH4 maintains full peripheral functionality at 48 MHz, including simultaneous LCD refresh and ADC sampling.

Does the MKL33Z256VLH4 support external crystal oscillators, and what are the supported frequencies?

Yes, the MKL33Z256VLH4 supports two external crystal configurations: a 32–40 kHz crystal for RTC operation (XTAL32/EXTAL32 pins) and a 3–32 MHz crystal for system clocking (XTAL/EXTAL pins). The 32 kHz crystal remains active in all low-power modes except VLLS0, enabling precise timekeeping during deep sleep. The main crystal oscillator supports automatic failover to internal clocks if the external source fails, ensuring system robustness in harsh environments. The MKL33Z256VLH4 does not require external crystals for basic operation due to its factory-trimmed 48 MHz HIRC.

How many LCD segments can the MKL33Z256VLH4 drive, and what are the voltage requirements?

The MKL33Z256VLH4 integrates a dedicated segment LCD controller capable of driving up to 28×8 (224) or 32×4 (128) segments, configurable via software. It supports static, 2-, 3-, or 4-mux operation with programmable contrast and bias voltage generation. The LCD voltage is derived from VDD and requires no external charge pump; typical segment voltage is VDD/3 for 3-mux operation. The MKL33Z256VLH4 maintains full LCD functionality in VLPR and VLPW modes, enabling visible display updates while consuming <100 µA.

What debug interface does the MKL33Z256VLH4 provide, and is JTAG supported?

The MKL33Z256VLH4 provides a two-pin Serial Wire Debug (SWD) interface (SWD_CLK and SWD_DIO) compliant with ARM CoreSight standards. It supports full debug, flash programming, and real-time trace via SWD - no JTAG interface is implemented. This reduces PCB footprint and simplifies connector design compared to traditional 10-pin JTAG. The MKL33Z256VLH4 also includes a Micro Trace Buffer for instruction flow analysis, accessible exclusively through SWD. No external debug probe license is required for standard IAR/Keil/GCC toolchains.

Is the MKL33Z256VLH4 pin-compatible with other Kinetis KL33 variants, and what package options exist?

Yes, the MKL33Z256VLH4 is pin-compatible with all 64-pin KL33 family members, including MKL33Z128VLH4 and MKL33Z256VMP4. It uses the 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch), sharing identical pinout and electrical characteristics with MKL33Z128VLH4 - only flash (256 KB vs. 128 KB) and SRAM (32 KB vs. 16 KB) differ. The BGA variant (MKL33Z256VMP4) shares functionality but requires PCB redesign due to different pad layout and thermal profile. The MKL33Z256VLH4 marking "MKL33Z256V//LH4" confirms its LQFP identity per Freescale's ordering guide.