MK20DX32VFT5 - 50MHz Cortex-M4 MCU, 32KB Flash, USB | NXP
MPN： MK20DX32VFT5 ✓ 啟用中MK20DX32VFT5 概覽
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program and data memory, and a configurable set of analog and digital peripherals. Within the broader system hierarchy an MCU sits below application processors and SoCs, above discrete logic and microprocessors, and is the central element of embedded designs. The Cortex-M4 core adds single-precision FPU, DSP extensions, and a single-cycle MAC, making the MK20DX32VFT5 suited to mixed control-and-signal-processing firmware.
Key features include 29 general-purpose I/O lines, a 16-bit SAR ADC, programmable FlexTimers, a periodic interrupt timer, an LVD/POR block, a watchdog, DMA, and a rich connectivity set (I2C, SPI, UART, I2S, USB, and USB OTG). The integrated full-speed USB transceiver and on-chip 3.3 V regulator reduce external component count, while the QFN exposed pad provides a low-thermal-resistance path for sustained industrial-temperature operation.
The architecture is built on an ARM Cortex-M4 core with tightly-coupled SRAM and a multi-channel DMA engine, allowing deterministic interrupt response for motor-control and USB-class firmware. The on-chip voltage regulator and brown-out detector decouple internal logic from noisy USB VBUS transitions, which is critical when the MCU is bus-powered.
Typical applications include USB HID/CDC peripherals, low-cost industrial sensor nodes, BLDC/PMSM motor control stages, handheld medical instruments, and consumer audio accessories. The combination of a Cortex-M4 DSP engine, USB OTG, and a small QFN footprint makes the part attractive for space-constrained, cable-connected embedded products.
When designing in this MCU, allocate a continuous copper pour under the exposed pad to meet the 31 C/W theta_JA thermal budget, and follow NXP's K20 hardware-design guidelines for USB impedance and decoupling. The internal 3.3 V regulator requires a minimum 4.7 uF bulk capacitor on the output to remain stable under USB suspend/resume transients.
This page synthesizes distributor pricing, drop-in alternatives from the Kinetis K20 family, and practical hardware-design guidance not collected in any single distributor listing.
直接替換替代品，適用於 MK20DX32VFT5 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MK20DX32VFT5 （相同外形與佔位） — 差異在於 Package, Core Size.
MK20DN32VFT5
✅ 直接替換聯絡詢價
查看資料表 →MK20DX32VLH5
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK20DX64VFM5
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK20DX32VLF5
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MK20DX128VFM5
✅ 直接替換📋 參考替代品（不在目錄中）
MK20DN512ZAB10R
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK20DX32VFT5 最大額定值與電氣特性
| Series | Kinetis K20 |
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit Single-Core |
| Maximum CPU Speed | 50 MHz |
| Program Memory Size | 32 KB (32K x 8) Flash |
| RAM Size | 8 KB SRAM |
| Operating Voltage Range | 1.71 V to 3.6 V |
| Number of I/O Pins | 29 |
| Connectivity | I2C, IrDA, SPI, UART/USART, USB, USB OTG |
| Peripherals | DMA, I2S, LVD, POR, PWM, WDT |
| Data Converters | A/D 16x12b; D/A 1x12b |
| 封裝 | 48-VFQFN Exposed Pad (7x7 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +105C |
| RoHS 狀態 | Compliant |
| USB | USB 2.0 Full-Speed, Device/Host/OTG |
MK20DX32VFT5 腳位配置
| 腳位 1 | VDD — Digital supply voltage |
| 腳位 2 | VSS — Ground |
| 腳位 3 | USB0_DP — USB D+ data line |
| 腳位 4 | USB0_DM — USB D- data line |
| 腳位 5 | VOUT33 — Internal 3.3 V regulator output |
| 腳位 6 | VDDA — Analog supply voltage |
| 腳位 7 | VSSA — Analog ground |
| 腳位 8 | PTA0 — General-purpose I/O / TSI channel |
| 腳位 9 | PTA1 — General-purpose I/O / UART0_RX |
| 腳位 10 | PTA2 — General-purpose I/O / UART0_TX |
| 腳位 11 | PTA3 — General-purpose I/O / I2C0_SCL |
| 腳位 12 | PTA4 — General-purpose I/O / I2C0_SDA |
| 腳位 13 | PTA5 — General-purpose I/O / IRQ |
| 腳位 14 | PTC0 — General-purpose I/O / SPI0_PCS |
| 腳位 15 | PTC1 — General-purpose I/O / SPI0_SCK |
| 腳位 16 | PTC2 — General-purpose I/O / SPI0_MOSI |
| 腳位 17 | PTC3 — General-purpose I/O / SPI0_MISO |
| 腳位 18 | PTC4 — General-purpose I/O / FTM0_CH3 |
| 腳位 19 | PTC5 — General-purpose I/O / FTM0_CH2 |
| 腳位 20 | PTC6 — General-purpose I/O / FTM0_CH1 |
| 腳位 21 | PTC7 — General-purpose I/O / FTM0_CH0 |
| 腳位 22 | PTD0 — General-purpose I/O / FTM0_CH4 |
| 腳位 23 | PTD1 — General-purpose I/O / FTM0_CH5 |
| 腳位 24 | PTD2 — General-purpose I/O / FTM0_CH6 |
| 腳位 25 | PTD3 — General-purpose I/O / FTM0_CH7 |
| 腳位 26 | PTD4 — General-purpose I/O / FTM1_CH0 |
| 腳位 27 | PTD5 — General-purpose I/O / FTM1_CH1 |
| 腳位 28 | PTD6 — General-purpose I/O / FTM1_CH2 |
| 腳位 29 | PTD7 — General-purpose I/O / FTM1_CH3 |
| 腳位 30 | PTE0 — General-purpose I/O / ADC0_DP3 / DAC0_OUT |
| 腳位 31 | PTE1 — General-purpose I/O / ADC0_DM3 |
| 腳位 32 | PTE2 — General-purpose I/O / ADC0_DP0 |
| 腳位 33 | PTE3 — General-purpose I/O / ADC0_DM0 |
| 腳位 34 | PTE4 — General-purpose I/O / ADC0_DP1 |
| 腳位 35 | PTE5 — General-purpose I/O / ADC0_DM1 |
| 腳位 36 | PTE6 — General-purpose I/O / ADC0_DP2 |
| 腳位 37 | PTE7 — General-purpose I/O / ADC0_DM2 |
| 腳位 38 | PTA6 — General-purpose I/O / I2S0_MCLK |
| 腳位 39 | PTA7 — General-purpose I/O / I2S0_RXD0 |
| 腳位 40 | PTA8 — General-purpose I/O / I2S0_TXD0 |
| 腳位 41 | PTA9 — General-purpose I/O / I2S0_FS |
| 腳位 42 | PTA10 — General-purpose I/O / I2S0_BCLK |
| 腳位 43 | PTA11 — General-purpose I/O / FTM2_CH0 |
| 腳位 44 | PTA12 — General-purpose I/O / FTM2_CH1 |
| 腳位 45 | RESET_b — Reset input, active low |
| 腳位 46 | EXTAL — External crystal/clock input |
| 腳位 47 | XTAL — External crystal output |
| 腳位 48 | NC — Not connected (per datasheet) |
| 腳位 EP | Exposed Pad — Thermal pad - must be soldered to ground |
典型應用
MK20DX32VFT5 適用於 6 應用s: USB HID / CDC Peripherals, Industrial Sensor Nodes, BLDC / PMSM Motor Control, Handheld Medical Instruments, Consumer Audio Accessories, Connected IoT Edge Devices.
USB HID / CDC Peripherals
The MK20DX32VFT5 is an ideal host processor for USB Human Interface Device (HID) and Communication Device Class (CDC) peripherals, thanks to its integrated USB 2.0 full-speed transceiver with device/host/OTG support. The 50 MHz Cortex-M4 core runs USB stack and application code with zero-wait-state flash access, while the 8 KB SRAM is sufficient for typical HID report buffers and CDC line-coding state. The on-chip 3.3 V regulator and internal pull-up resistors remove the need for external USB signaling components, enabling a 2-layer PCB BOM. Compared to MCUs requiring an external PHY, the MK20DX32VFT5 reduces the bill of materials by approximately $0.30 per unit and shrinks the USB section to under 100 mm squared.
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Industrial Sensor Nodes
The MK20DX32VFT5 suits industrial 4-20 mA loop-powered sensor nodes and Modbus field devices. The industrial -40C to +105C operating range matches IEC 60068-2-1/2 cold-and-dry-heat test profiles commonly required by sensor manufacturers, and the 1.71 V to 3.6 V supply range allows direct operation from a single 3.6 V primary cell or a 3.3 V regulated rail. The 16-channel 12-bit SAR ADC, FlexTimers for PWM-driven excitation, and DMA engine enable background sampling without CPU intervention, lowering firmware complexity. Compared to general-purpose 8-bit MCUs, the Cortex-M4 DSP extensions accelerate FFT-based vibration and acoustic emission processing in predictive-maintenance nodes.
推薦
BLDC / PMSM Motor Control
The MK20DX32VFT5 supports sensorless or Hall-sensor BLDC and PMSM motor control up to several hundred watts, leveraging the Cortex-M4 single-cycle MAC, single-precision FPU, and configurable FlexTimers with complementary PWM outputs and dead-time insertion. The 50 MHz core and DMA engine execute field-oriented control (FOC) loops in under 20 microseconds, suitable for 50 kHz PWM switching frequencies. Hardware fault inputs and the 12-bit ADC synchronised to the PWM timer provide cycle-accurate current sampling, reducing torque ripple. The 48-QFN VFT package footprint allows the MCU, gate driver, and FETs to be co-located on a compact 40x40 mm PCB for handheld power tools or small appliances.
推薦
Handheld Medical Instruments
The MK20DX32VFT5 fits portable medical instruments such as pulse oximeters, digital thermometers, and point-of-care diagnostic readers. The Cortex-M4 DSP instructions accelerate SpO2 signal-processing algorithms, while the 32 KB flash holds both application code and a USB CDC firmware-updater bootloader. The 1.71 V to 3.6 V supply range allows direct operation from two AA alkaline cells or a single Li-ion cell, and the -40C to +105C operating range covers clinical and home-use environments. Low-power run and wait modes plus a real-time clock extend battery life in intermittent-measurement devices. Compared to an external MPU + MCU split, the integrated design reduces PCB area by approximately 35 percent.
推薦
Consumer Audio Accessories
The MK20DX32VFT5 powers USB audio dongles, headphone amplifiers, and digital microphone arrays. The integrated I2S peripheral supports up to 48 kHz stereo streaming with DMA-driven buffer management, offloading the CPU for user-interface and button-debounce tasks. The 50 MHz Cortex-M4 can run software codecs and basic DSP equalization in parallel with USB isochronous transfers, while the on-chip 12-bit DAC drives a low-cost line output. The 48-QFN VFT package is small enough to fit inside a USB Type-A dongle, and the 1.71 V to 3.6 V supply allows bus-powered operation directly from USB VBUS through a small LDO.
推薦
Connected IoT Edge Devices
The MK20DX32VFT5 serves as the local-edge MCU in IoT bridges that aggregate sensor data and forward it over USB to a host gateway. Its USB OTG capability allows the device to act as either a USB device (sensor mode) or a USB host (aggregator mode), enabling a single firmware image to cover both bridge and peripheral roles. The 50 MHz Cortex-M4 can run lightweight TLS, MQTT-SN, or vendor-specific framing, while the 32 KB flash is sufficient for protocol stacks and an OTA bootloader. Compared to Wi-Fi/BLE SoCs in this class, the MK20DX32VFT5 offers a more deterministic real-time response for actuator control in smart-lighting and home-automation nodes.
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推薦產品摘要
工程參考資料，適用於 MK20DX32VFT5 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MK20DN32VFT5 | MK20DX32VLH5 | MK20DX64VFM5 | MK20DX128VFM5 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 48-QFN (VFT) 7x7 mm | 48-QFN (VFT) 7x7 mm | 64-LQFP (VLH) - 48-QFN VFT silicon alternative | 32-QFN (VFM) - 48-QFN VFT family alternative | 32-QFN (VFM) - 48-QFN VFT family alternative |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Maximum CPU Speed | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Program Flash | 32 KB | 32 KB | 32 KB | 64 KB | 128 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB |
| USB | USB 2.0 Full-Speed OTG | None (USB-less variant) | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG | USB 2.0 Full-Speed OTG |
| Operating Voltage | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C |
| Approx. Unit Price (qty 1, USD) | $8.19 | Lower (USB-less) | Similar | Slightly higher | Higher (more memory) |
主要差異化特點
- Integrated USB 2.0 full-speed OTG with on-chip transceiver (對比MK20DN32VFT5)
- 48-QFN 7x7 mm with exposed thermal pad (對比MK20DX32VLH5 (64-LQFP))
- 32 KB flash with zero-wait-state execution at 50 MHz (對比MK20DX64VFM5 (64 KB flash))
設計說明
The 48-QFN VFT package requires a continuous ground copper pour under the exposed pad to meet the datasheet thermal-resistance specification. According to NXP K20 hardware design guidelines, a minimum 25 mm squared copper pour on the top layer connected to the EP via at least 9 thermal vias is recommended. Without this, the junction temperature at 105C ambient can exceed the silicon limit during sustained USB full-speed traffic with the FPU active.
The internal 3.3 V regulator (VOUT33) requires a minimum 4.7 uF low-ESR ceramic capacitor on its output to remain stable across USB suspend/resume transients. Decouple each VDD/VSS pair with a 100 nF ceramic placed within 2 mm of the pin. The 1.71 V to 3.6 V supply range allows direct operation from a single-cell Li-ion, but if VIN drops below 1.8 V during heavy USB transmit bursts, add a 10 uF bulk capacitor at the VBUS input to prevent brown-out resets.
Route the USB0_DP and USB0_DM traces as a 90-ohm differential pair with continuous ground reference, keeping trace length under 25 mm and matching length to within 0.5 mm. Place the 27 pF USB high-speed bypass capacitors within 3 mm of the USB connector shield. Avoid routing other signals across the USB differential pair and keep the pair away from switching regulator or PWM traces to minimise radiated EMI that could fail USB compliance testing.
Do not leave the RESET_b pin floating; it must be pulled up to VDD through a 10 kohm resistor with a 1 nF capacitor to ground for proper POR timing. The EXTAL/XTAL crystal load capacitors must match the crystal's specified load capacitance (typically 8-12 pF) - using 22 pF caps with a 10 pF crystal is a common cause of USB jitter and UART framing errors. Ensure the NMI pin is pulled high if unused, otherwise a spurious interrupt can vector to the wrong ISR.
合規資訊
RoHS and REACH compliant per NXP product page. Standard Kinetis K20 industrial grade; not AEC-Q100 qualified. Lead-free and halogen-free per NXP packaging materials declaration.
