NXP Semiconductors MCXC444VLH

Overview

MCXC444VLH from NXP is an Arm® Cortex®-M0+ microcontroller operating at up to 48 MHz, featuring 256 KB Flash, 32 KB SRAM, and 16 KB Boot ROM. It integrates USB Full-Speed 2.0 device interface (crystal-less), segment LCD controller (24×8 or 28×4 segments), FlexIO for custom serial peripheral emulation, and achieves 1.96 μA deep-sleep current with RTC + RAM retention - deployed in smart power sockets and battery-powered home security sensors.

For engineers reviewing the MCXC444VLH datasheet, MCXC444VLH pinout, MCXC444VLH application, or MCXC444VLH equivalent, key selection criteria include crystal-less USB FS support, segment LCD drive capability, deep-sleep power budget ≤2 μA, LQFP64 package compatibility, and FlexIO-based protocol customization for HMI peripherals.

Technical Context

The MCXC444VLH implements a single-core Arm Cortex-M0+ CPU with micro trace buffer and NVIC, paired with a low-leakage wake-up unit and configurable clock gating. Its system architecture includes dual LPUARTs, two I²C interfaces, two SPI modules, one UART, and a 12-bit ADC with internal reference.

Power management leverages multiple low-power modes: very low-power run mode (54 μA/MHz), deep sleep (1.96 μA with RTC+RAM retained), and stop mode (77 nA). USB FS operation requires no external crystal due to integrated oscillator calibration against internal RC.

Key Specifications

Pinout & Package

MCXC444VLH is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per NXP reference manual MCXC444RM, Rev. 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCXC444VLH, MCXC443VLH offers identical package and peripherals but reduced memory - suitable for leaner firmware; KL27Z128VLH lacks SLCD and crystal-less USB, increasing BOM and layout complexity for display-integrated designs.

Availability

MCXC444VLH is available at Aetrix Electronics and suitable for smart power sockets, home security sensors, smart lighting panels, and DC fan controllers requiring stable component supply across industrial and consumer production cycles.

Supply support for MCXC444VLH 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MCX C Series targets cost-sensitive, battery-operated edge devices needing integrated USB, segment LCD, and ultra-low-power operation - bridging entry-level MCU requirements with scalable memory and flexible peripheral sets.

FAQ

Does MCXC444VLH require an external crystal for USB Full-Speed operation?

No, MCXC444VLH integrates a factory-trimmed internal oscillator calibrated to ±0.25% accuracy, enabling crystal-less USB FS 2.0 device operation. This eliminates the need for an external 12 MHz crystal and associated load capacitors, reducing bill-of-materials cost and PCB layout complexity. The oscillator remains active in USB suspend mode and supports automatic resynchronization after resume events. MCXC444VLH maintains full USB compliance without external timing components.

What segment LCD configurations does MCXC444VLH support?

MCXC444VLH supports two segment LCD configurations: 24 commons × 8 segments (192 total) or 28 commons × 4 segments (112 total), with software-selectable multiplexing. It includes integrated charge pump and bias generation, eliminating external voltage boosters. The SLCD controller operates independently of the CPU core, allowing display refresh during low-power modes. MCXC444VLH's SLCD module is fully compatible with common 7-segment + decimal point alphanumeric glass displays used in smart sockets and thermostats.

How does MCXC444VLH achieve 1.96 μA deep-sleep current?

MCXC444VLH reaches 1.96 μA in deep sleep by powering down all clocks except the 32 kHz RTC oscillator, retaining contents of selected SRAM banks and RTC registers while disabling flash, ADC, and most peripherals. The low-leakage wake-up unit monitors GPIOs and LPUART start bits with sub-μA static draw. This mode is validated per NXP MCXC444RM Rev. 1, and MCXC444VLH maintains full register state and interrupt vector mapping upon wake-up. No external circuitry is required to achieve this spec.

Is MCXC444VLH pin-compatible with other MCX C44x variants?

Yes, MCXC444VLH shares identical 64LQFP pinout and signal mapping with MCXC443VLH and MCXC242VLH, including USB, SLCD, FlexIO, and LPUART assignments. All three parts use the same mechanical footprint and thermal pad layout, enabling drop-in replacement within the same package family. However, differences in Flash/SRAM size and peripheral enablement (e.g., SLCD presence) require firmware validation. MCXC444VLH's full peripheral set makes it the highest-capability option in the VLH variant group.

What debug interfaces are supported on MCXC444VLH?

MCXC444VLH supports Serial Wire Debug (SWD) via dedicated SWDIO and SWCLK pins, compliant with ARM CoreSight standards. It includes a Micro Trace Buffer (MTB) for instruction trace capture without external probes. Debug access is secured via flash protection and debug lock bits. MCXC444VLH is fully supported by MCUXpresso IDE, IAR Embedded Workbench, and Keil MDK, with vendor-provided CMSIS-DAP and SEGGER J-Link firmware compatibility. No additional debug hardware beyond standard SWD probe is required.