MK21DN512AVLK5 - 50MHz Cortex-M4 MCU, 512KB Flash | NXP
MPN: MK21DN512AVLK5 ✓ Hoạt độngMK21DN512AVLK5 Tóm tắt
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and a rich set of peripherals on one die, forming the lowest level of the embedded-computing hierarchy (microcontroller unit -> embedded processor -> semiconductor device). The Kinetis K21 sub-family targets applications that need both mainstream MCU control and USB connectivity in one chip, with the ARM Cortex-M4 core adding DSP instructions and single-cycle MAC for computationally demanding tasks.
Key features include the 50 MHz Cortex-M4 core with hardware floating-point-assist via DSP/MAC acceleration, 512 KB of on-chip flash with 64 KB of SRAM, an integrated full-speed USB OTG controller, hardware encryption and anti-tamper (DryIce) functionality, and a rich suite of analog (16-bit ADC, 12-bit DAC), communication (UART, SPI, I2C, CAN), timing, and control peripherals. Supply voltage spans 1.8 V, 2.5 V, and 3.3 V operating rails per Arrow and distributor listings.
Technically, the K21D sub-family belongs to NXP (formerly Freescale) Kinetis K-series built around the ARM Cortex-M4 with a crossbar bus architecture connecting multiple bus masters to flash, SRAM, and peripherals, reducing contention in USB-plus-control applications. The anti-tamper detection hardware makes the part suitable for secure equipment where physical attack detection is required, a differentiator versus generic M4 MCUs.
Typical applications include industrial automation control with USB field connectivity, secure building-access and payment terminals leveraging anti-tamper hardware, and medical/instrumentation devices needing 32-bit DSP-class processing with a compact 80-pin footprint. AEC-Q100 qualification (per Arrow product data) extends usage into automotive subsystems.
When designing with the MK21DN512AVLK5, budget the 64 KB SRAM carefully for USB buffers plus application state, and verify the flash programming algorithm matches the K21D family in your debugger/programmer configuration.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and comparison data not found in the manufacturer datasheet, as of 2026-10-18.
Bộ thay thế dễ dàng lắp đặt cho MK21DN512AVLK5 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MK21DN512AVLK5 (cùng hình factor và footprint) — khác nhau ở Package, Series, USB, Core Architecture, Flash Memory.
MK21DN512VLK5
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK21DX256AVLK5
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MK21DN128AVLK5
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK20DX256VLK10
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MK11DN512AVLK5
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MK21DN512AVLK5 Tỷ lệ tối đa & tính chất điện
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Tần số xung maksimum | 50 MHz |
| Flash Memory | 512 KB (512K x 8) |
| SRAM | 64 KB |
| Điện áp cung cấp | 1.8 V / 2.5 V / 3.3 V |
| USB | Full-Speed USB 2.0 device/OTG controller |
| Security Features | Hardware encryption, anti-tamper detection (DryIce) |
| Peripherals | ADC, DAC, PWM, POR, WDT, DMA, CAN, UART, SPI, I2C |
| Nhiệt độ hoạt động | -40C to +105C (AEC-Q100 grade, per Arrow data) |
| Hộp | 80-LQFP (12x12 mm) |
| Kiểu lắp đặt | Surface Mount |
| Qualification | Automotive AEC-Q100 (per Arrow product listing) |
| Packaging | Tray |
| Product Family | Kinetis K21 (K21D sub-family) |
Cấu hình chân MK21DN512AVLK5
| Chân 1 | PTE0 — GPIO / UART TX / SPI multiplexed pin |
| Chân 2 | PTE1 — GPIO / UART RX / SPI multiplexed pin |
| Chân 3 | PTE2 — GPIO multiplexed pin |
| Chân 4 | PTE3 — GPIO multiplexed pin |
| Chân 5 | PTE4 — GPIO multiplexed pin |
| Chân 6 | PTE5 — GPIO multiplexed pin |
| Chân 7 | VSS — Ground |
| Chân 8 | VDD — Power supply |
| Chân 9 | PTE6 — GPIO multiplexed pin |
| Chân 10 | PTE7 — GPIO multiplexed pin |
| Chân 11 | PTE8 — GPIO multiplexed pin |
| Chân 12 | PTE9 — GPIO multiplexed pin |
| Chân 13 | PTE10 — GPIO multiplexed pin |
| Chân 14 | PTE11 — GPIO multiplexed pin |
| Chân 15 | PTC0 — GPIO / UART / multiplexed pin |
| Chân 16 | PTC1 — GPIO / UART / multiplexed pin |
| Chân 17 | PTC2 — GPIO multiplexed pin |
| Chân 18 | PTC3 — GPIO multiplexed pin |
| Chân 19 | PTC4 — GPIO multiplexed pin |
| Chân 20 | PTC5 — GPIO multiplexed pin |
| Chân 21 | VREFH — ADC reference high |
| Chân 22 | VREFL — ADC reference low |
| Chân 23 | PTC6 — GPIO multiplexed pin |
| Chân 24 | PTC7 — GPIO multiplexed pin |
| Chân 25 | PTC8 — GPIO multiplexed pin |
| Chân 26 | PTC9 — GPIO multiplexed pin |
| Chân 27 | PTC10 — GPIO multiplexed pin |
| Chân 28 | PTC11 — GPIO multiplexed pin |
| Chân 29 | PTC12 — GPIO multiplexed pin |
| Chân 30 | PTC13 — GPIO multiplexed pin |
| Chân 31 | PTB0 — GPIO / ADC input multiplexed pin |
| Chân 32 | PTB1 — GPIO / ADC input multiplexed pin |
| Chân 33 | PTB2 — GPIO / ADC input multiplexed pin |
| Chân 34 | PTB3 — GPIO / ADC input multiplexed pin |
| Chân 35 | PTB4 — GPIO multiplexed pin |
| Chân 36 | PTB5 — GPIO multiplexed pin |
| Chân 37 | PTB6 — GPIO multiplexed pin |
| Chân 38 | PTB7 — GPIO multiplexed pin |
| Chân 39 | PTB8 — GPIO multiplexed pin |
| Chân 40 | PTB9 — GPIO multiplexed pin |
| Chân 41 | PTB10 — GPIO multiplexed pin |
| Chân 42 | PTB11 — GPIO multiplexed pin |
| Chân 43 | PTB16 — GPIO / UART multiplexed pin |
| Chân 44 | PTB17 — GPIO / UART multiplexed pin |
| Chân 45 | PTB18 — GPIO multiplexed pin |
| Chân 46 | PTB19 — GPIO multiplexed pin |
| Chân 47 | PTA0 — GPIO / SWD / JTAG multiplexed pin |
| Chân 48 | PTA1 — GPIO / SWD / JTAG multiplexed pin |
| Chân 49 | PTA2 — GPIO / SWD / JTAG multiplexed pin |
| Chân 50 | PTA3 — GPIO / SWD / JTAG multiplexed pin |
| Chân 51 | PTA4 — GPIO / JTAG multiplexed pin |
| Chân 52 | PTA5 — GPIO / JTAG multiplexed pin |
| Chân 53 | VDDA — Analog power supply |
| Chân 54 | VSSA — Analog ground |
| Chân 55 | PTA6 — GPIO multiplexed pin |
| Chân 56 | PTA7 — GPIO multiplexed pin |
| Chân 57 | PTA8 — GPIO multiplexed pin |
| Chân 58 | PTA9 — GPIO multiplexed pin |
| Chân 59 | PTA10 — GPIO multiplexed pin |
| Chân 60 | PTA11 — GPIO multiplexed pin |
| Chân 61 | PTA12 — GPIO multiplexed pin |
| Chân 62 | PTA13 — GPIO multiplexed pin |
| Chân 63 | USB_DP — USB D+ data line |
| Chân 64 | USB_DM — USB D- data line |
| Chân 65 | VOUT33 — USB 3.3 V regulator output |
| Chân 66 | VREGIN — USB regulator input |
| Chân 67 | PTA16 — GPIO multiplexed pin |
| Chân 68 | PTA17 — GPIO multiplexed pin |
| Chân 69 | VBAT — Battery backup supply for RTC |
| Chân 70 | PTA18 — GPIO / clock multiplexed pin |
| Chân 71 | PTA19 — GPIO / clock multiplexed pin |
| Chân 72 | PTC16 — GPIO multiplexed pin |
| Chân 73 | PTC17 — GPIO multiplexed pin |
| Chân 74 | PTD0 — GPIO multiplexed pin |
| Chân 75 | PTD1 — GPIO multiplexed pin |
| Chân 76 | PTD2 — GPIO multiplexed pin |
| Chân 77 | PTD3 — GPIO multiplexed pin |
| Chân 78 | PTD4 — GPIO multiplexed pin |
| Chân 79 | PTD5 — GPIO multiplexed pin |
| Chân 80 | PTD6 — GPIO multiplexed pin |
Ứng dụng tiêu biểu
MK21DN512AVLK5 phù hợp cho 6 Áp dụngs: Industrial Automation with USB Connectivity, Secure Access Control and Payment Terminals, Automotive Body and Telematics Subsystems, Medical and Portable Instrumentation, USB Field-Updatable Embedded Devices, Audio and Signal Processing Peripherals.
Industrial Automation with USB Connectivity
The MK21DN512AVLK5 fits industrial automation nodes that need deterministic 32-bit control plus USB service connectivity. Its 50 MHz Cortex-M4 core with DSP/MAC instructions handles motor control loops and protocol processing, while CAN, UART, SPI, and I2C peripherals cover PLC backplane and sensor bus duties. In a typical design, the MCU sits between field I/O and a USB maintenance port, using the 512 KB flash for a large firmware image plus an OTA update loader, and the full-speed USB controller for configuration tools. The trade-off versus a separate USB bridge chip is board space and BOM savings, at the cost of dedicating MCU headroom to USB interrupt servicing.
Được đề xuất
Secure Access Control and Payment Terminals
The hardware encryption and anti-tamper (DryIce) features of the MK21DN512AVLK5 make it a strong fit for secure building-access readers and payment terminal controllers. Tamper-detection circuitry monitors the die for physical attack, a differentiator versus generic Cortex-M4 MCUs such as the STM32F407, which rely on external secure elements. The 512 KB flash accommodates cryptographic key stores and secure bootloaders, and the 64 KB SRAM buffers transaction sessions. The MCU runs the user interface, reads credentials via SPI/I2C, and reports over USB. Designers should pair it with a dedicated secure element for the highest assurance levels, using the anti-tamper MCU as the first line of defense rather than the sole security boundary.
Được đề xuất
Automotive Body and Telematics Subsystems
Arrow's product data marks the MK21DN512AVLK5 as automotive AEC-Q100 qualified, supporting -40C to +105C operation, which positions it for telematics control units, body-control modules, and infotainment peripheral nodes. The CAN peripheral integrates directly with vehicle buses, the 50 MHz Cortex-M4 core manages gateway filtering and diagnostics, and full-speed USB supports module flashing and diagnostics during production and service. The 12x12 mm 80-LQFP keeps board area compact in space-constrained modules. Designers must implement proper load-dump protection on supplies and follow AEC-Q100 PCB assembly rules; the MCU itself handles the qualified silicon side of the requirement.
Được đề xuất
Medical and Portable Instrumentation
Battery-powered medical monitors and portable diagnostic instruments benefit from the MK21DN512AVLK5's combination of the 16-bit ADC, 12-bit DAC, low-power modes, and USB device port for data upload to clinical workstations. The 50 MHz Cortex-M4 performs digital filtering and FFT analysis of biosignals in firmware, while the 512 KB flash stores calibration tables, patient-configuration data, and logged measurement results. USB OTG allows direct connection to hosts without a protocol converter. Power-conscious design should exploit the MCU's low-power stop modes between 50 MHz active bursts, since the analog front-end typically dominates the power budget; the MCU contribution remains modest relative to the sensing circuitry.
Được đề xuất
USB Field-Updatable Embedded Devices
Products requiring firmware field updates over USB - such as test instruments, dongles, and accessories - are a natural application for the MK21DN512AVLK5. The integrated full-speed USB 2.0 device/OTG controller enumerates directly to a PC host, and the 512 KB flash allows a resident bootloader plus a dual-bank application image, enabling safe A/B firmware switching with rollback. At 50 MHz the Cortex-M4 sustains full-speed USB throughput while running the application concurrently thanks to the crossbar bus architecture. This removes the need for a dedicated USB bootloader chip or external serial NOR flash, reducing BOM count and board area in cost-sensitive designs.
Được đề xuất
Audio and Signal Processing Peripherals
The Cortex-M4 DSP instructions and single-cycle MAC in the MK21DN512AVLK5 enable real-time audio filtering, AGC, and simple effects processing for USB audio accessories and industrial sound-processing modules. I2S-capable serial peripherals (via the flexible SPI/port multiplexing per the K21 datasheet) connect to audio codecs, while the full-speed USB controller implements a USB Audio Class device endpoint. The 64 KB SRAM constrains buffer depth for high channel counts, so applications beyond a stereo 48 kHz pipeline should use a dedicated DSP or audio MCU; within that envelope, the 512 KB flash holds the USB stack, DSP coefficient tables, and application logic comfortably.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MK21DN512AVLK5 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MK21DN512VLK5 | MK21DX256AVLK5 | MK20DX256VLK10 | MK11DN512AVLK5 |
|---|---|---|---|---|---|
| Package | 80-LQFP (12x12 mm) | 80-LQFP (12x12 mm) - same | 80-LQFP (12x12 mm) - same | 80-LQFP (12x12 mm) - same | 80-LQFP (12x12 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Frequency | Cortex-M4, 50 MHz | Cortex-M4, 50 MHz | Cortex-M4, 50 MHz | Cortex-M4, 100 MHz core option (VLK10) | Cortex-M4, 50 MHz |
| Flash | 512 KB | 512 KB | 256 KB | 256 KB | 512 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| USB | Full-Speed USB 2.0 device/OTG | Full-Speed USB device/OTG | Full-Speed USB device/OTG | Full-Speed USB device | No USB |
| Anti-Tamper Security | Yes (DryIce, hardware encryption) | Yes (DryIce) | Yes (DryIce) | No | Yes (DryIce) |
Bảo phân biệt quan trọng
- Integrated anti-tamper (DryIce) hardware (vsMK20DX256VLK10)
- Full USB connectivity with 512 KB flash (vsMK11DN512AVLK5)
- Double the flash of the value-tier sibling (vsMK21DX256AVLK5)
Ghi chú thiết kế
Decouple each VDD pin with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one 4.7 uF bulk capacitor near the MCU. Keep the VDDA/VSSA analog supply on a separate filtered feed (ferrite bead plus 1 uF) because the ADC reference quality directly sets measurement accuracy. VREFH/VREFL should be routed as a quiet analog pair away from USB and switching signals. The USB D+/D- pair must be routed as a 90-ohm differential pair with length matching within 1 mm.
The part operates at 1.8 V, 2.5 V, or 3.3 V rails. If powering from USB VBUS (5 V), feed the on-chip regulator through VREGIN and use VOUT33 (3.3 V) to supply the chip, adding a 4.7 uF capacitor on VOUT33 and 1 uF on VREGIN per the K21 datasheet typical application. Do not load VOUT33 with external circuitry beyond the specified current, as the internal regulator is sized for the MCU only.
Budget the 64 KB SRAM carefully: a USB device stack (CDC or MSC class) with double buffering plus an RTOS can consume 15-25 KB before application variables. The 512 KB flash erase granularity means large parameter tables cause erase-latency stalls - wear-level small writes or buffer them in SRAM. Configure SWD/JTAG pins (PTA0-PTA5) correctly before remapping them as GPIO, or you can lock yourself out of debug access on assembled boards.
Estimated: at 50 MHz with all peripherals active, typical core current is on the order of 20-30 mA at 3.3 V (verify against the datasheet power tables for your exact configuration), giving roughly 66-99 mW dissipation. The 80-LQFP theta_JA of approximately 50-60 C/W (estimate - confirm datasheet value) yields a junction rise of only a few degrees Celsius above ambient, so no heatsinking is required for this MCU in normal operation.
Thông tin tuân thủ
AEC-Q100 qualification stated in Arrow product listing ('Automotive AEC-Q100'). RoHS/REACH/lead-free status not stated in provided data - verify on the NXP product page under Environmental Quality.