MK20DX256VLH7 - Kinetis K20 72MHz Cortex-M4 MCU | 256KB Flash
MPN: MK20DX256VLH7 ✓ AktifMK20DX256VLH7 Ringkasan
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.
Alternatif penggantian untuk MK20DX256VLH7 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MK20DX256VLH7 (sama faktor bentuk dan footprint) — berbeda di dalam Package, SRAM, ADC, Communication Peripherals, Core Architecture.
MK20DX128VLH5
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MK20DX256VLK7
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
MK22FN256VLH12
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MK22FN128VLH10
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
MK30DX256VLH7
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MK20DX256VLH7 Rating Maksimal & Karakteristik Listrik
| 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 |
| Paket | 64-pin LQFP (10x10 mm) |
| Tipe Mounting | Surface Mount |
| Rentang Suhu Kerja | -40C to +105C |
| Level MSL | 3 |
| Status RoHS | Compliant |
| Sub-Family | Kinetis K20 |
| Series | K20_72 |
Konfigurasi Pin MK20DX256VLH7
| Pin produk 1 | PTE0 — GPIO, UART1_TX, TPM1_CH1 |
| Pin produk 2 | PTE1 — GPIO, UART1_RX, TPMI_CH0 |
| Pin produk 3 | PTE2 — GPIO, SPI1_MISO |
| Pin produk 4 | PTE3 — GPIO, SPI1_MOSI |
| Pin produk 5 | PTE4 — GPIO, SPI1_SCK |
| Pin produk 6 | PTE5 — GPIO, SPI1_PCS0 |
| Pin produk 7 | PTE6 — GPIO |
| Pin produk 8 | VDD — Supply voltage |
| Pin produk 9 | VSS — Ground |
| Pin produk 10 | USB0_DP — USB Data Plus |
| Pin produk 11 | USB0_DM — USB Data Minus |
| Pin produk 12 | VOUT33 — USB regulator output (3.3V) |
| Pin produk 13 | VREGIN — USB regulator input |
| Pin produk 14 | PTA16 — GPIO, SPI0_PCS0 |
| Pin produk 15 | PTA17 — GPIO, SPI0_SCK |
| Pin produk 16 | PTA18 — GPIO, SPI0_MOSI |
| Pin produk 17 | PTA19 — GPIO, SPI0_MISO |
| Pin produk 18 | PTA20 — GPIO |
| Pin produk 19 | PTA21 — GPIO |
| Pin produk 20 | PTA22 — GPIO |
| Pin produk 21 | PTA23 — GPIO |
| Pin produk 22 | PTA24 — GPIO |
| Pin produk 23 | PTA25 — GPIO |
| Pin produk 24 | PTA26 — GPIO |
| Pin produk 25 | PTA27 — GPIO |
| Pin produk 26 | PTA28 — GPIO |
| Pin produk 27 | PTA29 — GPIO |
| Pin produk 28 | PTA30 — GPIO |
| Pin produk 29 | PTA31 — GPIO |
| Pin produk 30 | PTB0 — GPIO, I2C0_SCL |
| Pin produk 31 | PTB1 — GPIO, I2C0_SDA |
| Pin produk 32 | PTB2 — GPIO, I2C0_SCL |
| Pin produk 33 | PTB3 — GPIO, I2C0_SDA |
| Pin produk 34 | PTB4 — GPIO |
| Pin produk 35 | PTB5 — GPIO |
| Pin produk 36 | PTB6 — GPIO |
| Pin produk 37 | PTB7 — GPIO |
| Pin produk 38 | PTB8 — GPIO |
| Pin produk 39 | PTB9 — GPIO |
| Pin produk 40 | PTB10 — GPIO |
| Pin produk 41 | PTB11 — GPIO |
| Pin produk 42 | VSS — Ground |
| Pin produk 43 | VDD — Supply voltage |
| Pin produk 44 | PTC0 — GPIO, EXTRG_IN |
| Pin produk 45 | PTC1 — GPIO, TPM0_CH0 |
| Pin produk 46 | PTC2 — GPIO, TPM0_CH1 |
| Pin produk 47 | PTC3 — GPIO, TPM0_CH2 |
| Pin produk 48 | PTC4 — GPIO, TPM0_CH3 |
| Pin produk 49 | PTC5 — GPIO |
| Pin produk 50 | PTC6 — GPIO |
| Pin produk 51 | PTC7 — GPIO |
| Pin produk 52 | PTC8 — GPIO |
| Pin produk 53 | PTC9 — GPIO |
| Pin produk 54 | PTC10 — GPIO |
| Pin produk 55 | PTC11 — GPIO |
| Pin produk 56 | PTC12 — GPIO |
| Pin produk 57 | PTC13 — GPIO |
| Pin produk 58 | PTC14 — GPIO |
| Pin produk 59 | PTC15 — GPIO |
| Pin produk 60 | PTD0 — GPIO |
| Pin produk 61 | PTD1 — GPIO |
| Pin produk 62 | PTD2 — GPIO |
| Pin produk 63 | PTD3 — GPIO |
| Pin produk 64 | PTD4 — GPIO |
Aplikasi Umum
MK20DX256VLH7 cocok untuk 7 aplikasis: 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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MK20DX256VLH7 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | 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 |
Diferensiator Kunci
- 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)
Catatan Desain
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.
