NXP Semiconductors MK21FX512AVMC12

Overview

MK21FX512AVMC12 from NXP Semiconductors (formerly Freescale) is a 120 MHz ARM Cortex-M4 microcontroller with FPU, 512 KB flash, 128 KB SRAM, DryIce tamper detection, USB LS/FS OTG 2.0 with integrated 3.3 V/120 mA LDO, and CAN interface - designed for secure, low-power electronic point-of-sale terminals requiring full state retention at 5.1 μA static current.

For engineers reviewing the MK21FX512AVMC12 datasheet, MK21FX512AVMC12 pinout, MK21FX512AVMC12 application, or MK21FX512AVMC12 equivalent, key selection factors include its 121-pin MAPBGA package, –40 to 105°C industrial temperature range, dual 16-bit ADCs, hardware encryption engine, and support for USB Device Charger Detect and Secure Digital host controller (SDHC).

Technical Context

The MK21FX512AVMC12 implements an ARM Cortex-M4 core with DSP extensions and single-precision floating-point unit, delivering 1.25 DMIPS/MHz. Its clock system integrates PLL, FLL, and multiple internal oscillators supporting 3–32 MHz crystal inputs and 32 kHz RTC crystal, enabling precise timing across run, VLPR, STOP, and VLLSx power modes.

Security architecture includes DryIce tamper detection with active/passive pin monitoring, temperature/voltage/clock fault sensing, hardware CRC, true random-number generator, and 128-bit unique chip ID. Analog subsystem comprises two independent 16-bit SAR ADCs, two 12-bit DACs, three analog comparators, and voltage reference - all operating within 1.71–3.6 V supply range.

Key Specifications

Pinout & Package

Package: 121-pin MAPBGA, 8 mm × 8 mm × 1.4 mm, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MK21FN1M0AVMC12, the MK21FX512AVMC12 trades flash capacity for cost optimization in fixed-function EPOS devices; versus MK64FX512VLQ12, it delivers superior tamper resilience in a smaller footprint but lacks Ethernet - making it ideal for physically secured, space-constrained payment terminals.

Availability

MK21FX512AVMC12 is available at Aetrix Electronics and suitable for electronic point-of-sale terminals, industrial human-machine interfaces, and secure access control systems requiring stable component supply across extended product lifecycles.

Supply support for MK21FX512AVMC12 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in ARM-based microcontrollers and embedded security.

The Kinetis K21F family - including MK21FX512AVMC12 - was engineered for cost-sensitive, security-critical embedded systems such as electronic payment terminals, where low-power operation, tamper resistance, and USB/CAN connectivity are essential.

FAQ

What is the maximum operating frequency of the MK21FX512AVMC12 core?

The MK21FX512AVMC12 features an ARM Cortex-M4 core with floating-point unit rated for up to 120 MHz operation. This frequency is achievable when the Phase-Locked Loop (PLL) is configured in PEE mode with appropriate clock source and voltage conditions (1.71–3.6 V supply). Performance remains stable across the full –40 to 105°C industrial temperature range, and the MK21FX512AVMC12 delivers 1.25 Dhrystone MIPS per MHz at this speed.

Does the MK21FX512AVMC12 support USB device charging detection?

Yes, the MK21FX512AVMC12 includes a dedicated USB Device Charger Detect (DCD) module compliant with USB Battery Charging Specification v1.2. This allows the MK21FX512AVMC12 to identify downstream charging ports (SDP, CDP, DCP) and configure appropriate current limits without external circuitry - essential for portable EPOS terminals that must operate from various USB power sources.

What tamper detection capabilities does the MK21FX512AVMC12 provide?

The MK21FX512AVMC12 integrates the DryIce security module, which provides hardware-enforced tamper detection through active and passive pin monitoring, temperature sensing, clock fault detection, and supply voltage supervision. Upon tamper event, the MK21FX512AVMC12 can trigger immediate secure memory wipe, disable debug interfaces, and assert tamper alert signals - meeting requirements for PCI PTS v5.x and other payment security standards.

What is the SRAM capacity and organization of the MK21FX512AVMC12?

The MK21FX512AVMC12 contains 128 KB of on-chip SRAM, organized as a unified memory space accessible by the Cortex-M4 core and DMA controller. It supports full read/write access at maximum core frequency, includes parity error detection, and retains full contents in STOP and VLLSx low-power modes down to 5.1 μA - enabling fast resume and secure context preservation in the MK21FX512AVMC12.

Which communication interfaces are supported by the MK21FX512AVMC12 for industrial connectivity?

The MK21FX512AVMC12 supports CAN 2.0B, six UARTs (including LIN-capable), three SPIs, three I²Cs, SDHC, and I²S - providing comprehensive industrial interface coverage. Its CAN module operates up to 1 Mbps and includes message buffering and FIFO support, while the FlexBus external bus interface enables connection to NOR/NAND flash or external peripherals - making the MK21FX512AVMC12 suitable for programmable logic controllers and distributed I/O systems.