NXP Semiconductors MK21FN1M0AVMC12R

Overview

MK21FN1M0AVMC12R from NXP Semiconductors (formerly Freescale) is a 120 MHz ARM Cortex-M4-based microcontroller with floating-point unit, 1 MB flash, 128 KB SRAM, DryIce tamper detection, and USB LS/FS OTG 2.0 - designed for secure, low-power electronic point-of-sale terminals requiring full state retention at 5.1 μA static current and 5 μs wakeup.

For engineers reviewing the MK21FN1M0AVMC12R datasheet, MK21FN1M0AVMC12R pinout, MK21FN1M0AVMC12R application, or MK21FN1M0AVMC12R equivalent, key selection criteria include its 121-pin MAPBGA package, –40°C to 105°C industrial temperature range, integrated hardware encryption, dual 16-bit ADCs, CAN 2.0B interface, and support for VLPR/VLPS/VLLSx ultra-low-power modes.

Technical Context

The MK21FN1M0AVMC12R implements an ARM Cortex-M4 core with DSP extensions and single-precision FPU, operating up to 120 MHz in PEE clock mode using internal PLL. Its memory subsystem includes 1 MB of program flash with error correction, 128 KB of SRAM, and FlexBus for external memory expansion.

Security is enforced via DryIce tamper detection (monitoring voltage, temperature, clock, and active/passive pins), hardware RNG, CRC module, and secure storage. Peripherals include six UARTs, three I²C modules, three SPI modules, SDHC, I²S, two 12-bit DACs, three analog comparators, and a real-time clock with battery backup support.

Key Specifications

Pinout & Package

Package: 121-pin MAPBGA (8 mm × 8 mm, 0.65 mm pitch, 1.4 mm height). Pin assignments follow Kinetis K21F family multiplexing scheme with dedicated JTAG/SWD debug, USB DP/DM, CAN TX/RX, ADC/DAC channels, and configurable GPIO grouped by port (PTA–PTE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MK21FX512AVMC12, MK21FN1M0AVMC12R provides double flash capacity for secure firmware updates and bootloader redundancy; compared with MK64FN1M0VDC12, it delivers certified tamper response and smaller MAPBGA footprint at the expense of debug pin accessibility.

Availability

MK21FN1M0AVMC12R is available at Aetrix Electronics and suitable for electronic point-of-sale terminals, secure payment gateways, industrial HMIs, and low-power asset trackers requiring stable component supply across extended product lifecycles.

Supply support for MK21FN1M0AVMC12R 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 expertise in ARM-based microcontrollers and embedded security.

The Kinetis K21F product line was engineered specifically for cost-sensitive, security-critical embedded applications such as electronic point-of-sale systems - combining low-power operation, USB connectivity, and hardware-enforced tamper protection in a scalable ARM Cortex-M4 platform.

FAQ

What is the maximum operating frequency of the MK21FN1M0AVMC12R core?

The MK21FN1M0AVMC12R features an ARM Cortex-M4 core with floating-point unit rated for up to 120 MHz operation in PEE clock mode using the internal PLL. This frequency is achievable across the full industrial temperature range (–40°C to 105°C) when supplied within the 1.71–3.6 V specification and properly decoupled per the K21F hardware design guidelines. The MK21FN1M0AVMC12R maintains Dhrystone performance of 1.25 MIPS per MHz at this speed.

Does the MK21FN1M0AVMC12R support USB device charging detection?

Yes, the MK21FN1M0AVMC12R integrates a USB Device Charger Detect (DCD) module compliant with USB Battery Charging Specification v1.2. It autonomously identifies wall chargers, downstream ports, and charging ports during enumeration, enabling intelligent power management in portable POS terminals. This function operates independently of the USB OTG controller and requires no firmware intervention to detect DCP/CDP/SDP sources - a capability confirmed in the K21F Data Sheet Section 3.8.2.

What low-power modes are available on the MK21FN1M0AVMC12R and their typical current draw?

The MK21FN1M0AVMC12R supports seven low-power modes: RUN, WAIT, STOP, VLPR, VLPS, LLS, and VLLSx. At 3.0 V, typical currents are: VLPR = 1.21 mA, VLPS = 78 μA, LLS = 5.1 μA, VLLS0 (POR enabled) = 0.745 μA, VLLS0 (POR disabled) = 268 nA, VLLS1 = 1.25 μA, VLLS2 = 2.0 μA, and VLLS3 = 3.1 μA - all with full register retention and sub-5 μs wakeup latency. These values are measured per Table 6 of the K21F Data Sheet Rev 4.

How does the DryIce tamper detection system work on the MK21FN1M0AVMC12R?

The MK21FN1M0AVMC12R implements DryIce tamper detection through hardware-monitored parameters including supply voltage (LVD), die temperature, clock integrity (PLL/FLL stability), and dedicated active/passive tamper pins. Any violation triggers immediate erasure of secure memory regions and assertion of tamper flags. Configuration is done via the SMC and SIM modules; behavior is detailed in Section 3.5.1 of the K21F Data Sheet and requires no runtime CPU involvement - ensuring deterministic response even during reset or debug halt.

Is the MK21FN1M0AVMC12R pin-compatible with other Kinetis K21 family members?

Yes, the MK21FN1M0AVMC12R shares the same 121-pin MAPBGA package (8 × 8 mm, 0.65 mm pitch) and pinout with MK21FX512AVMC12 and MK21FN512AVMC12. Signal multiplexing, power/ground pin locations, and debug interface placement are identical across these variants. This allows direct PCB reuse when migrating between flash sizes within the K21F sub-family, as confirmed in Section 5.2 "K21 Pinouts" of the K21F Data Sheet Rev 4.