NXP Semiconductors MK51DX128CMC7

Overview

MK51DX128CMC7 from NXP Semiconductors (formerly Freescale) is a 32-bit ARM Cortex-M4 core microcontroller with DSP extensions, 128 KB flash, 16 KB SRAM, and integrated analog/peripheral subsystems for embedded control. It operates from 1.71–3.6 V across –40 to +85°C, supports USB On-The-Go, dual 16-bit SAR ADCs with PGA, and real-time clock - deployed in industrial sensor nodes and low-power HMI systems.

For engineers reviewing the MK51DX128CMC7 datasheet, MK51DX128CMC7 pinout, MK51DX128CMC7 application, or MK51DX128CMC7 equivalent, key selection criteria include its 72 MHz max CPU frequency, 121-pin MAPBGA package (8 mm × 8 mm), dual ADC architecture with programmable gain, USB transceiver integration, and support for multiple low-power stop modes down to 1.47 µA.

Technical Context

The MK51DX128CMC7 implements a multi-clock domain architecture with MCG (Multipurpose Clock Generator) supporting FEE, FEI, and BLPE modes, enabling dynamic clock scaling between 72 MHz run mode and 4 MHz VLPR mode. Its memory subsystem includes 128 KB program flash with FlexMemory partitioning capability and 16 KB SRAM with parity protection.

Peripherals are organized into autonomous domains: two independent 16-bit SAR ADCs each with integrated PGA (up to ×64), eight-channel PWM timer with motor control features, five UARTs, two I²C modules, two SPI interfaces, and an I²S audio interface - all accessible via configurable pin multiplexing under the K51 signal assignment matrix.

Key Specifications

Pinout & Package

Package: 121-pin MAPBGA (8 mm × 8 mm, MC suffix), 0.5 mm pitch, 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 MK51DX256CMC7, the MK51DX128CMC7 offers identical peripheral functionality and footprint at lower flash cost; versus KL27Z128VLH4, it delivers higher compute throughput, richer analog subsystem, and USB OTG - making it optimal for feature-rich, power-constrained edge controllers.

Availability

MK51DX128CMC7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, motor control edge devices, and human-machine interface terminals requiring stable component supply and long-term lifecycle support.

Supply support for MK51DX128CMC7 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, and mobile applications.

The MK51DX128CMC7 belongs to the Kinetis K51 sub-family - designed specifically for cost-optimized, low-power industrial control and sensing applications requiring rich analog integration, USB connectivity, and extended temperature operation.

FAQ

What is the maximum operating frequency of the MK51DX128CMC7?

The MK51DX128CMC7 supports a maximum CPU frequency of 72 MHz in normal run mode, achieved using the MCG in FEE mode with an external 32 MHz crystal and PLL multiplication. This delivers 115 DMIPS performance while maintaining compatibility with its 1.71–3.6 V supply range and –40 to +85°C ambient rating. The MK51DX128CMC7 also supports lower-frequency modes including VLPR at up to 4 MHz for ultra-low-power operation.

Does the MK51DX128CMC7 include a hardware floating-point unit (FPU)?

No, the MK51DX128CMC7 integrates an ARM Cortex-M4 core with DSP extensions but does not include a hardware floating-point unit. Its 'D' suffix in the part number (MK51DX128CMC7) explicitly denotes Cortex-M4 with DSP only - distinct from 'F'-suffix variants like MK51FX256xxx that add single-precision FPU. Signal processing requiring floating-point math must be implemented in software or via CMSIS-DSP library optimizations on the MK51DX128CMC7.

How many analog-to-digital converters does the MK51DX128CMC7 have, and what are their key capabilities?

The MK51DX128CMC7 integrates two independent 16-bit successive approximation register (SAR) ADCs. Each ADC includes a programmable gain amplifier (PGA) with selectable gains of ×1, ×2, ×4, ×8, ×16, ×32, and ×64, enabling direct measurement of low-amplitude sensor outputs without external amplification. Both ADCs support hardware averaging, configurable sample time, and flexible trigger sources - allowing synchronous or interleaved sampling for high-fidelity industrial sensing applications on the MK51DX128CMC7.

Is the MK51DX128CMC7 pin-compatible with other K51 family members?

Yes, the MK51DX128CMC7 shares identical pinout and package (121-pin MAPBGA, MC suffix) with the MK51DX256CMC7 and MK51DX256CLL7 - confirmed by the K51 Sub-Family Data Sheet Rev. 3, Section 8.2. This enables direct PCB reuse when upgrading flash capacity. However, it is not pin-compatible with LQFP or QFN-package K51 variants (e.g., MK51DX128CLL7), as those use different pin assignments and physical footprints despite functional similarity.

What low-power modes are supported by the MK51DX128CMC7, and what is the lowest achievable current draw?

The MK51DX128CMC7 supports seven low-power modes: RUN, WAIT, VLPR, STOP, VLPS, LLS, and three VLLS sub-modes. The deepest operational state is VLLS1, which achieves 1.47 µA typical current draw at –40 to +25°C with RTC and LPUART enabled - verified in Table 6 of the K51 Sub-Family Data Sheet. This mode retains RAM and selected registers while allowing wake-up via GPIO, RTC alarm, or analog comparator, making it ideal for battery-powered endpoints using the MK51DX128CMC7.