NXP Semiconductors MCF51AG128VQH

Overview

MCF51AG128VQH from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller designed for industrial and appliance control systems. It integrates 128 KB flash, 16 KB RAM, dual 12-bit ADCs with 24 inputs, two 6-channel FTM modules, and a hardware CRC engine. It operates up to 50.33 MHz across 2.7–5.5 V and supports ultra-low-power stop modes - deployed in motor control, HVAC, and smart metering applications.

For engineers reviewing the MCF51AG128VQH datasheet, MCF51AG128VQH pinout, MCF51AG128VQH application, or MCF51AG128VQH equivalent, key selection criteria include ColdFire V1 ISA_C compliance, 80-pin LQFP package compatibility, on-chip debug via single-wire BDM, and verified support for real-time interrupt handling with 44 peripheral I/O requests and configurable priority levels.

Technical Context

The MCF51AG128VQH implements the ColdFire Instruction Set Architecture Revision C (ISA_C) with a 32-bit variable-length RISC core delivering 0.94 DMIPS/MHz from internal RAM. Its system clock architecture combines an external crystal oscillator (1–16 MHz) and an internal frequency-locked loop (FLL) with trimmable reference for ±2% accuracy across –40°C to +105°C.

Peripheral integration includes two independent flexible timer modules (FTM1/FTM2), each with six channels supporting deadtime insertion and synchronized register loading; a dual 12-bit ADC subsystem with asynchronous clocking and hardware-triggered ping-pong sampling; and a programmable iEvent module enabling combinational logic outputs for DMA, interrupts, or hardware triggers without CPU intervention.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (14 mm × 14 mm), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Kinetis K22FN512VLH12 and MCF52259CAG80, the MCF51AG128VQH offers optimal balance of ColdFire V1 compatibility, 80-pin LQFP packaging, and integrated analog/peripheral features for cost-sensitive industrial control - without requiring architectural rework or PCB redesign.

Availability

MCF51AG128VQH is available at Aetrix Electronics and suitable for industrial automation, smart metering, and appliance control applications requiring stable component supply, long-term lifecycle support, and qualified automotive-grade temperature range (–40°C to +105°C).

Supply support for MCF51AG128VQH 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 markets, with deep heritage in microcontroller innovation through its acquisition of Freescale.

The MCF51AG128VQH belongs to the ColdFire V1 microcontroller product line, engineered specifically for deterministic real-time control in resource-constrained industrial and white-goods applications where low-power operation, integrated analog peripherals, and robust debug capability are critical.

FAQ

What is the maximum operating frequency of the MCF51AG128VQH?

The MCF51AG128VQH operates at up to 50.33 MHz across its full voltage range (2.7 V to 5.5 V). This frequency is achievable with both internal FLL and external crystal oscillator sources. Performance is validated per Freescale Document Number MCF51AG128 Rev. 5, Section 3.1. The MCF51AG128VQH delivers 0.94 Dhrystone 2.1 DMIPS per MHz when executing from internal RAM, making it suitable for real-time control tasks in industrial environments.

Does the MCF51AG128VQH support hardware debug during real-time operation?

Yes, the MCF51AG128VQH supports real-time debug via its single-wire background debug module (BDM), which includes six hardware breakpoints (four PC, one address pair, one data), on-chip trace buffer with programmable start/stop conditions, and debug visibility bus for optional partial data trace. These capabilities are fully documented in the MCF51AG128VQH datasheet Rev. 5, Section 3.5. The MCF51AG128VQH enables non-intrusive observation without halting execution - essential for time-critical motor control or communication stack validation.

What ADC configurations does the MCF51AG128VQH support?

The MCF51AG128VQH features a 24-input, 12-bit ADC with configurable output formatting (8-, 10-, or 12-bit right-justified), single or continuous conversion modes, and asynchronous clocking for noise reduction. It supports hardware-triggered ping-pong sampling using RTC, PDB, or iEvent signals. These specifications are confirmed in Freescale MCF51AG128 Rev. 5, Section 3.7. The MCF51AG128VQH also integrates an on-chip temperature sensor and allows simultaneous dual-sample acquisition - critical for precision thermal monitoring in appliances.

Is the MCF51AG128VQH pin-compatible with other ColdFire derivatives?

No, the MCF51AG128VQH is not pin-compatible with other ColdFire families such as MCF5225x or MCF5445x. Its 80-pin LQFP package (14 mm × 14 mm) and pin assignments - including dedicated RGPIO, FTM, and iEvent signal routing - are unique to the MCF51AG128 series. Pin compatibility is only guaranteed within the MCF51AG128 family across same-pin-count variants (e.g., MCF51AG128VLH vs. MCF51AG128VQH). Refer to Figure 2 and Table 3 in the MCF51AG128 Rev. 5 datasheet for authoritative pin mapping of the MCF51AG128VQH.

What watchdog features are implemented in the MCF51AG128VQH?

The MCF51AG128VQH integrates two independent watchdog systems: a configurable advanced watchdog timer (WDOG) with windowed mode, high-granulation timeout, and forced reset behavior; and an external watchdog monitor (EWM) with separate input (EWM_in) and output (EWM_out) pins to supervise external circuitry. Both are detailed in Section 3.4 of the MCF51AG128 Rev. 5 datasheet. The MCF51AG128VQH uses these to meet IEC 61508 SIL-2 functional safety requirements in industrial control applications by providing layered failure detection and recovery.