NXP Semiconductors MCF51QU128VHS

Overview

MCF51QU128VHS from NXP Semiconductors (formerly Freescale) is a ColdFire V1-based 32-bit microcontroller with 128 KB on-chip flash, operating up to 50 MHz, supporting -40°C to 105°C ambient temperature, 1.71–3.6 V supply, and integrated analog peripherals including 12-bit ADC/DAC and comparator. It serves in industrial motor control, smart sensor nodes, and battery-powered HMI systems requiring low-power operation and mixed-signal integration.

For engineers reviewing the MCF51QU128VHS datasheet, MCF51QU128VHS pinout, MCF51QU128VHS application, or MCF51QU128VHS equivalent, key selection considerations include its 44-pin Laminate QFN package, 10 low-power modes (including VLLS1–VLLS3), FlexNVM/FlexRAM memory architecture, single-wire BDM debug interface, and hardware CRC module for firmware integrity verification.

Technical Context

The MCF51QU128VHS implements the ColdFire V1 core with Dhrystone 2.1 performance of 0.99 DMIPS/MHz when executing from flash and includes a multipurpose clock generator (MCG) supporting crystal oscillators across three frequency ranges (1 kHz–32 MHz). Its system-level features include a four-channel DMA controller and Mini-FlexBus external bus interface for memory expansion.

Analog subsystem integration comprises a 12-bit SAR ADC with configurable resolution and sampling rate, a 12-bit DAC, and an analog comparator with embedded 6-bit DAC and programmable reference input. Power management is enabled via voltage regulator (VREG), low-leakage wakeup unit (LLWU), and 10 selectable low-power modes - including VLPR, VLPW, VLPS, LLS, and VLLS variants - each with defined current consumption and wake-up latency.

Key Specifications

Pinout & Package

Package: 44-pin Laminate QFN (5 mm × 5 mm), exposed thermal pad, RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with K22F51212 and S32K144, the MCF51QU128VHS offers lower active and stop-mode current, ColdFire deterministic timing, and FlexNVM for wear-leveling - making it optimal for cost-sensitive, battery-constrained industrial and consumer HMI applications where ARM ecosystem advantages are unnecessary.

Availability

MCF51QU128VHS is available at Aetrix Electronics and suitable for industrial motor control, smart utility metering, medical wearable sensor hubs, and automotive body control modules requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MCF51QU128VHS 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 MCF51QU128VHS belongs to NXP's ColdFire V1 microcontroller family, designed specifically for cost-optimized, low-power embedded applications requiring mixed-signal integration, deterministic real-time performance, and long-term supply stability in harsh environments.

FAQ

What is the maximum operating frequency of the MCF51QU128VHS core?

The MCF51QU128VHS features a ColdFire V1 core rated for up to 50 MHz system and core clock frequency in normal run mode. This is confirmed in Table 8 of the official datasheet (Rev. 5, 03/2015), where fSYS is specified as -/50 MHz. At this frequency, the device delivers 0.99 DMIPS per MHz when executing from flash memory, enabling responsive real-time control in applications such as motor drives and sensor processing. The MCF51QU128VHS maintains full functionality across its entire voltage (1.71–3.6 V) and temperature (-40°C to 105°C) range at this speed.

Does the MCF51QU128VHS support hardware debugging, and what interface is used?

Yes, the MCF51QU128VHS integrates the ColdFire DEBUG_Rev_B+ interface with single-wire Background Debug Mode (BDM) support. This allows full run-control debugging - including breakpoints, watchpoints, memory inspection, and flash programming - using only one dedicated pin (BKGD), significantly reducing PCB routing complexity versus traditional JTAG. The interface is fully supported by CodeWarrior Development Studio and compatible third-party tools. The MCF51QU128VHS does not require external debug probes for basic programming and debug tasks, streamlining development and production programming workflows.

What analog peripherals are integrated into the MCF51QU128VHS?

The MCF51QU128VHS integrates a comprehensive analog subsystem: a 12-bit SAR ADC with up to 16 input channels and configurable sampling rates; a 12-bit DAC for precision analog output generation; an analog comparator (CMP) with embedded 6-bit DAC and programmable reference input; and a dedicated voltage reference (VREF) module. These peripherals are electrically characterized across the full operating range (–40°C to 105°C, 1.71–3.6 V), with ADC INL/DNL and DAC monotonicity guaranteed per datasheet Section 6.6. The MCF51QU128VHS uses shared analog power (VDDA/VSSA) with strict differential voltage limits (±0.1 V), requiring careful PCB layout separation from digital domains.

How many low-power modes does the MCF51QU128VHS support, and what is the lowest current draw?

The MCF51QU128VHS supports 10 distinct low-power modes, including VLPR, VLPW, VLPS, LLS, and three Very Low-Leakage Stop (VLLS1–VLLS3) variants. In VLLS3 mode at 3.0 V and –40°C to 25°C ambient, the typical current draw is 1.8 μA, with a maximum of 3.3 μA. At 105°C, the maximum rises to 115 μA - still among the lowest in its class. These modes are enabled via the low-leakage wakeup unit (LLWU) and voltage regulator (VREG), allowing rapid wake-up (<100 μs) from selected GPIO, RTC, or LPTMR events. The MCF51QU128VHS datasheet provides measured IDD values for each mode in Table 5.

Is the MCF51QU128VHS pin-compatible with other members of the MCF51QU family?

No, the MCF51QU128VHS is not universally pin-compatible across the MCF51QU family. While it shares the same 44-pin Laminate QFN (HS) package with MCF51QU64VHS and MCF51QU32VHS, pin assignments differ between memory variants (e.g., MCF51QU128VHS vs. MCF51QU64VLF in 48-pin LQFP). The datasheet explicitly states that "pinout diagrams are specific to each package option" (Section 8.2), and signal multiplexing varies by part number. For example, certain ADC or TSI channels may be unavailable or relocated. Therefore, PCB layout must be verified against the MCF51QU128VHS-specific pin assignment table (Section 8.1), and migration from other MCF51QU variants requires schematic and layout review - the MCF51QU128VHS is not a drop-in replacement without validation.