MK20DX256VLH7 - Kinetis K20 72MHz Cortex-M4 MCU | 256KB Flash
MPN: MK20DX256VLH7 ✓ Hoạt độngMK20DX256VLH7 Tóm tắt
A microcontroller (MCU) is a single-chip processor that integrates a CPU core, memory (Flash and RAM), peripherals, and I/O into one device. The K20 sits in the hierarchy: ARM Cortex-M4 core -> Kinetis K-series MCU -> 32-bit microcontroller -> embedded processor -> semiconductor. Cortex-M4 specifically adds single-precision floating-point, MAC instructions, and DSP extensions, making it well-suited to mixed control-and-signal-processing tasks.
Key features of the MK20DX256VLH7 include a 72 MHz maximum CPU frequency with FPU and DSP, 256 KB Flash organized as 256K x 8, and 64 KB SRAM. Peripherals include a full-speed USB device controller with on-chip transceiver, multiple UART/SPI/I2C ports, 12-bit ADC and 12-bit DAC, FlexTimer modules, low-power modes with wake-up, and an operating voltage range tailored for 3.3 V systems. The LQFP-64 footprint simplifies two-layer PCB assembly compared to BGA alternatives.
The K20 architecture pairs an ARM Cortex-M4 core with NXP's peripheral bus and low-leakage wake-up unit, allowing fast wake from VLLS modes. The full-speed USB device controller with on-chip PHY eliminates external transceiver components, reducing BOM cost for USB-equipped designs.
Typical applications include USB peripherals (HID, CDC, MSD), human-machine interface panels, low-end audio processing, motor control loops, and industrial sensor nodes. Engineers select this MCU when they need Cortex-M4 DSP performance, integrated USB, and enough flash/RAM for a real-time OS or USB stack without moving to a higher-cost K60/K64 part.
When designing, pay attention to decoupling: place 0.1 uF and bulk capacitors near all VDD/VSS pairs, follow NXP's recommended crystal layout for the 32.768 kHz RTC oscillator, and ensure the USB DP/DN trace impedance matches 90 ohm differential for Full-Speed compliance.
This page synthesizes distributor pricing, verified drop-in alternatives (MK20DX128VLH5, MK22FN256VLH12), and practical design notes not collected in the NXP datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho MK20DX256VLH7 — 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 MK20DX256VLH7 (cùng hình factor và footprint) — khác nhau ở Package, SRAM, ADC, Communication Peripherals, Core Architecture.
MK20DX128VLH5
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MK20DX256VLK7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK22FN256VLH12
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MK22FN128VLH10
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK30DX256VLH7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MK20DX256VLH7 Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M4 with FPU and DSP |
| Maximum CPU Frequency | 72 MHz |
| Program Flash Memory | 256 KB (256K x 8) |
| SRAM | 64 KB |
| Operating Voltage Range | 1.71 V to 3.6 V |
| USB Controller | Full-Speed USB Device with on-chip transceiver |
| ADC | 12-bit |
| DAC | 12-bit |
| Hộp | 64-pin LQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Khoảng nhiệt độ hoạt động | -40C to +105C |
| Cấp MSL | 3 |
| Trạng thái RoHS | Compliant |
| Sub-Family | Kinetis K20 |
| Series | K20_72 |
Cấu hình chân MK20DX256VLH7
| Chân 1 | PTE0 — GPIO, UART1_TX, TPM1_CH1 |
| Chân 2 | PTE1 — GPIO, UART1_RX, TPMI_CH0 |
| Chân 3 | PTE2 — GPIO, SPI1_MISO |
| Chân 4 | PTE3 — GPIO, SPI1_MOSI |
| Chân 5 | PTE4 — GPIO, SPI1_SCK |
| Chân 6 | PTE5 — GPIO, SPI1_PCS0 |
| Chân 7 | PTE6 — GPIO |
| Chân 8 | VDD — Supply voltage |
| Chân 9 | VSS — Ground |
| Chân 10 | USB0_DP — USB Data Plus |
| Chân 11 | USB0_DM — USB Data Minus |
| Chân 12 | VOUT33 — USB regulator output (3.3V) |
| Chân 13 | VREGIN — USB regulator input |
| Chân 14 | PTA16 — GPIO, SPI0_PCS0 |
| Chân 15 | PTA17 — GPIO, SPI0_SCK |
| Chân 16 | PTA18 — GPIO, SPI0_MOSI |
| Chân 17 | PTA19 — GPIO, SPI0_MISO |
| Chân 18 | PTA20 — GPIO |
| Chân 19 | PTA21 — GPIO |
| Chân 20 | PTA22 — GPIO |
| Chân 21 | PTA23 — GPIO |
| Chân 22 | PTA24 — GPIO |
| Chân 23 | PTA25 — GPIO |
| Chân 24 | PTA26 — GPIO |
| Chân 25 | PTA27 — GPIO |
| Chân 26 | PTA28 — GPIO |
| Chân 27 | PTA29 — GPIO |
| Chân 28 | PTA30 — GPIO |
| Chân 29 | PTA31 — GPIO |
| Chân 30 | PTB0 — GPIO, I2C0_SCL |
| Chân 31 | PTB1 — GPIO, I2C0_SDA |
| Chân 32 | PTB2 — GPIO, I2C0_SCL |
| Chân 33 | PTB3 — GPIO, I2C0_SDA |
| Chân 34 | PTB4 — GPIO |
| Chân 35 | PTB5 — GPIO |
| Chân 36 | PTB6 — GPIO |
| Chân 37 | PTB7 — GPIO |
| Chân 38 | PTB8 — GPIO |
| Chân 39 | PTB9 — GPIO |
| Chân 40 | PTB10 — GPIO |
| Chân 41 | PTB11 — GPIO |
| Chân 42 | VSS — Ground |
| Chân 43 | VDD — Supply voltage |
| Chân 44 | PTC0 — GPIO, EXTRG_IN |
| Chân 45 | PTC1 — GPIO, TPM0_CH0 |
| Chân 46 | PTC2 — GPIO, TPM0_CH1 |
| Chân 47 | PTC3 — GPIO, TPM0_CH2 |
| Chân 48 | PTC4 — GPIO, TPM0_CH3 |
| Chân 49 | PTC5 — GPIO |
| Chân 50 | PTC6 — GPIO |
| Chân 51 | PTC7 — GPIO |
| Chân 52 | PTC8 — GPIO |
| Chân 53 | PTC9 — GPIO |
| Chân 54 | PTC10 — GPIO |
| Chân 55 | PTC11 — GPIO |
| Chân 56 | PTC12 — GPIO |
| Chân 57 | PTC13 — GPIO |
| Chân 58 | PTC14 — GPIO |
| Chân 59 | PTC15 — GPIO |
| Chân 60 | PTD0 — GPIO |
| Chân 61 | PTD1 — GPIO |
| Chân 62 | PTD2 — GPIO |
| Chân 63 | PTD3 — GPIO |
| Chân 64 | PTD4 — GPIO |
Ứng dụng tiêu biểu
MK20DX256VLH7 phù hợp cho 7 Áp dụngs: USB Human Interface Device (HID), Industrial Sensor Node with USB Diagnostics, Human-Machine Interface (HMI) Panel, Low-End Audio Processing, Brushless DC Motor Control, USB Communications Device Class (CDC) Bridge, Battery-Powered IoT Edge Node.
USB Human Interface Device (HID)
The MK20DX256VLH7's integrated full-speed USB 2.0 device controller with on-chip transceiver and 256 KB of flash make it an ideal host for USB HID class devices such as keyboards, mice, game controllers, and custom input peripherals. The on-chip PHY eliminates external transceiver cost, while 64 KB SRAM comfortably buffers HID reports and descriptor structures. At 72 MHz with Cortex-M4 DSP, the device handles polling intervals as tight as 1 ms without CPU strain, leaving headroom for application logic, debouncing, and LED matrix driving. Place 90 ohm differential routing on DP/DN traces and place a ferrite bead on VBUS to meet USB 2.0 FS compliance.
Được đề xuất
Industrial Sensor Node with USB Diagnostics
The MK20DX256VLH7's 12-bit ADC, 256 KB flash, and full-speed USB device port allow engineers to build industrial sensor nodes that stream measurements over USB CDC virtual COM port. The 64-pin LQFP footprint simplifies two-layer PCB assembly and the -40C to +105C operating range covers most industrial enclosures. Engineers can implement a real-time control loop on Cortex-M4 DSP while exposing diagnostic data over USB. Use the on-chip 12-bit DAC for 4-20 mA loop excitation or sensor calibration. Verify VDD decoupling with 100 nF + 10 uF bulk capacitors near the MCU supply pins.
Được đề xuất
Human-Machine Interface (HMI) Panel
The MK20DX256VLH7's 72 MHz Cortex-M4 with FPU and 256 KB flash supports small TFT LCD driving, touch scanning, and USB update interfaces in HMI panels. Use the integrated 12-bit ADC for touch sensing via resistive touchscreens, and FlexTimer/PWM modules for backlight dimming. The 64-LQFP package exposes enough GPIO for parallel LCD data plus capacitive touch I2C expansion. USB device mode enables firmware updates without JTAG. Implement a lightweight GUI library in flash with the Cortex-M4 hardware multiplier accelerating rendering.
Được đề xuất
Low-End Audio Processing
The MK20DX256VLH7's Cortex-M4 DSP extensions enable basic audio effects, equalization, and USB audio class streaming in low-end audio peripherals. The 12-bit DAC outputs audio directly to amplifiers, while the 256 KB flash stores DSP coefficients and small WAV samples. At 72 MHz, the device runs simple biquad filters, dynamic range compression, and USB Audio Class 1.0 streaming at 48 kHz mono. This suits headphone amplifiers, USB speakers, and intercom panels. Add an external I2S codec for higher fidelity playback.
Được đề xuất
Brushless DC Motor Control
The MK20DX256VLH7 drives BLDC motors via its FlexTimer/PWM modules, 12-bit ADC for back-EMF sensing, and Cortex-M4 DSP for field-oriented control math. The 256 KB flash holds sensor or sensorless FOC algorithms, and the 72 MHz clock achieves switching frequencies up to ~20 kHz with control loop periods below 50 us. Use the integrated 12-bit DAC for reference voltage generation and the on-chip comparator for hardware overcurrent protection. The 64-LQFP package exposes enough GPIO for three-phase gate drivers plus UART/USB diagnostics.
Được đề xuất
USB Communications Device Class (CDC) Bridge
The MK20DX256VLH7's full-speed USB and three UART modules make it a natural choice for USB-to-UART bridge designs that replace FTDI-style chips with vendor-customized firmware. The 256 KB flash supports the USB CDC stack plus protocol conversion logic, while the 64 KB SRAM buffers CDC-to-UART data. Implement RS-232/RS-485 protocol translation, Modbus RTU bridging, or proprietary command framing on the Cortex-M4 DSP. The 64-LQFP package and industrial temperature range support embedded gateway designs.
Được đề xuất
Battery-Powered IoT Edge Node
The MK20DX256VLH7's VLLS0 low-leakage stop mode, wide 1.71 V to 3.6 V supply range, and 72 MHz Cortex-M4 with FPU fit battery-powered IoT edge nodes that wake periodically to read sensors and transmit over USB or UART. The 64 KB SRAM with RTC retention keeps state across deep-sleep cycles. Use USB device mode for tethered configuration or charging, and the 12-bit ADC for battery voltage monitoring. Add an external buck-boost regulator for Li-ion operation across the full discharge curve.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MK20DX256VLH7 — 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 | MK20DX128VLH5 | MK22FN256VLH12 | MK30DX256VLH7 | MK22FN128VLH10 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same |
| Core | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU |
| Maximum CPU Frequency | 72 MHz | 50 MHz | 120 MHz | 72 MHz | 100 MHz |
| Flash Memory | 256 KB | 128 KB | 256 KB | 256 KB | 128 KB |
| SRAM | 64 KB | 32 KB | 64 KB | 64 KB | 32 KB |
| USB Controller | Full-Speed Device + on-chip PHY | Full-Speed Device + on-chip PHY | Full-Speed Device + on-chip PHY | Full-Speed Device + on-chip PHY | Full-Speed Device + on-chip PHY |
| Sub-Family | Kinetis K20 | Kinetis K20 | Kinetis K22 | Kinetis K30 | Kinetis K22 |
Bảo phân biệt quan trọng
- Full-speed USB device with on-chip PHY (vsMK20DX128VLH5)
- 72 MHz CPU speed for K20 family (vsMK22FN128VLH10)
- K20 sub-family with mature software support (vsMK22FN256VLH12)
Ghi chú thiết kế
Place 0.1 uF decoupling capacitors as close as possible to every VDD/VSS pin pair on the 64-LQFP package. Add a single 4.7 uF to 10 uF bulk capacitor near the MCU supply pins to handle switching transients. For USB applications, add a ferrite bead on VBUS and ensure the DP/DN traces are routed as a 90 ohm differential pair with characteristic impedance control. Keep the 32.768 kHz RTC crystal traces short and surrounded by ground pour per NXP reference designs.
The MK20DX256VLH7 has multiple power domains including VDD, VDDINT (internally regulated), VBAT, and VREGIN for USB. Use a 2.2 uF capacitor on VOUT33 to stabilize the internal USB 3.3 V regulator. Place a low-ESR 1 uF to 4.7 uF capacitor at the VREGIN pin when 5 V USB VBUS is supplied. The MCU operates from 1.71 V to 3.6 V; ensure your LDO or DC-DC can supply the peak transient currents during flash programming operations.
Do not exceed the maximum ESD rating on USB DP/DN pins. Add an external USBLC6-2SC6 or similar TVS array if the device will be hot-plugged. When migrating from MK20DX128VLH5 to MK20DX256VLH7, verify boot configuration pins and clock source defaults remain compatible. The 'VLH7' suffix designates 64-LQFP; 'VLK7' would be a different package. Confirm the bootloader chip on PJRC Teensy derivatives is correctly matched to the host MCU variant.
