NXP Semiconductors MK20DX256VLL7

Overview

MK20DX256VLL7 from NXP Semiconductors (formerly Freescale) is a 32-bit ARM Cortex-M4 microcontroller with DSP extension, 256 KB flash, 64 KB RAM, and 72 MHz max CPU frequency. It integrates dual 16-bit SAR ADCs with PGA, 12-bit DAC, CAN, USB OTG, five UARTs, and operates from 1.71–3.6 V across –40 to 105°C ambient. Used in industrial motor control and embedded HMI systems requiring real-time analog acquisition and low-power operation.

For engineers reviewing the MK20DX256VLL7 datasheet, MK20DX256VLL7 pinout, MK20DX256VLL7 application, or MK20DX256VLL7 equivalent, key selection considerations include its 100-pin LQFP package, VLL7 temperature grade (–40 to 105°C), FlexMemory support, and integrated TSI for capacitive touch interfaces.

Technical Context

The MK20DX256VLL7 implements the K20 sub-family architecture with MCG clock generator supporting multiple modes (FEI, FEE, FBE, BLPE), enabling flexible system clocking from internal RC to external crystal (3–32 MHz). Its memory subsystem includes 256 KB program flash with FlexMemory partitioning capability and 64 KB SRAM, with hardware CRC acceleration and 128-bit unique chip ID for firmware integrity and device identification.

Peripheral integration centers on mixed-signal timing precision: two independent 16-bit ADCs each with programmable gain amplifier (up to ×64), 12-bit DAC, three analog comparators with embedded 6-bit DACs, and a real-time clock with battery backup support. Communication is served by full-speed USB OTG, one FlexCAN module, two SPI, two I²C, five UART, and I²S interfaces - all synchronized to configurable bus clocks up to 50 MHz.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm), lead pitch 0.5 mm, exposed pad not present. Pinout conforms to K20P100M72SF1 Rev. 3 specification for MK20DX256VLL7 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MK20DX128VLL7, the MK20DX256VLL7 provides double flash for feature-rich firmware and field upgrades; versus MKE15Z256VLH7, it delivers higher determinism for motor control via Cortex-M4's DSP instructions and integrated USB PHY - critical for host-side device enumeration and firmware recovery.

Availability

MK20DX256VLL7 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, human-machine interface panels, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MK20DX256VLL7 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 edge processing.

The MK20DX256VLL7 belongs to the Kinetis K20 family - designed specifically for cost-sensitive, high-integration embedded applications demanding mixed-signal precision, low-power operation, and real-time responsiveness in harsh environments.

FAQ

What is the maximum operating frequency of the MK20DX256VLL7?

The MK20DX256VLL7 supports a maximum CPU core frequency of 72 MHz, achieved using the MCG clock generator in FEE mode with an external crystal or oscillator. This frequency is sustained across the full –40 to 105°C temperature range and 1.71–3.6 V supply voltage, enabling deterministic real-time execution for motor control and communication stacks. The MK20DX256VLL7 also supports lower-frequency low-power modes down to 4 MHz in VLPR mode.

Does the MK20DX256VLL7 include USB functionality, and what type is supported?

Yes, the MK20DX256VLL7 integrates a full-speed/low-speed USB On-The-Go (OTG) controller with an on-chip transceiver, supporting device, host, and OTG roles without external PHY components. It complies with USB 2.0 specification and includes dedicated USB voltage regulator (VREG) and DCD circuitry. The MK20DX256VLL7 USB interface is fully functional in both RUN and WAIT modes, and its driver stack is supported in NXP's MCUXpresso SDK.

What analog peripherals are integrated into the MK20DX256VLL7?

The MK20DX256VLL7 integrates two independent 16-bit SAR ADCs, each with a programmable gain amplifier (PGA) offering gains from ×1 to ×64; a 12-bit DAC; three analog comparators (each with an embedded 6-bit DAC and programmable reference); and a precision voltage reference module. These peripherals share common analog supply (VDDA/VSSA) and support hardware-triggered conversions, DMA-accelerated data transfer, and low-power operation - all confirmed in the K20P100M72SF1 datasheet for the MK20DX256VLL7 variant.

Is the MK20DX256VLL7 pin-compatible with other K20 family members?

The MK20DX256VLL7 uses a 100-pin LQFP package (LL suffix) and shares pinout compatibility with other K20 devices in the same package option, including MK20DX128VLL7 and MK20DX256VMC7 (which differs in package). However, pin compatibility is not guaranteed across all K20 variants - for example, MK20DX256VMC7 uses a 121-pin MAPBGA package and has different signal assignments. Always verify pin mapping against the specific MK20DX256VLL7 signal multiplexing table in the K20P100M72SF1 datasheet before PCB design.

What low-power modes does the MK20DX256VLL7 support, and what are their typical current draws?

The MK20DX256VLL7 supports seven low-power modes: RUN, WAIT, STOP, VLPR, VLPS, LLS, and VLLS (with sub-modes VLLS0–VLLS3). At 3.0 V and –40 to 25°C, typical current draws are: VLPR = 0.996 mA, VLPS = 5.9 µA, LLS = 2.6 µA, VLLS3 = 1.9 µA, VLLS2 = 1.59 µA, and VLLS1 = 1.47 µA. These values are measured with RTC enabled and all clocks disabled except required wakeup sources. The MK20DX256VLL7 achieves these ultra-low currents via dedicated power gating and clock gating per peripheral domain.