MK40DX256VLL7 - 256KB Flash 72MHz Cortex-M4 MCU | NXP
MPN: MK40DX256VLL7 ✓ Hoạt độngMK40DX256VLL7 Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals (USB, timers, ADC, segment LCD, GPIOs). The Cortex-M4 core adds single-precision FPU and DSP extensions, sitting in the hierarchy ARM Cortex-M -> 32-bit microcontroller -> embedded processor -> semiconductor. The K40 sub-family specifically targets human-machine interface (HMI) applications thanks to its integrated segment LCD driver.
Key features of the MK40DX256VLL7 include 256KB of on-chip Flash, 64KB of SRAM (per the Kinetis K40 sub-family datasheet), Full-Speed USB 2.0 with on-chip transceiver, Segment LCD controller supporting up to several dozen segments, multiple low-power modes (Wait, Stop, VLPR), 16-bit SAR ADC, 12-bit DAC, and a wide supply voltage range of 1.71V to 3.6V. The 100-LQFP footprint is a mainstream, easy-to-proto surface-mount package with 0.5 mm pitch.
On the architecture front, the K40 uses the Cortex-M4 with FPU, a 72 MHz bus matrix, and a flexible DMA engine (eDMA) that offloads memory-to-peripheral transfers. The integrated Segment LCD controller with charge pump and software-configurable contrast eliminates an external LCD driver, reducing BOM cost and PCB area for meter, appliance, and industrial-control designs.
Typical applications include low-power segment-LCD metering, USB-capable industrial sensor nodes, home appliance HMIs, point-of-sale terminals, secure element accessories, and battery-powered IoT endpoints. Its combination of integrated USB and segment LCD is unusual and unique to the K40 family.
When designing with this part, note that the LQFP-100 footprint is large (14x14 mm) compared to modern BGA Cortex-M parts; for new high-density designs consider Kinetis KE or LPC alternatives, but for legacy or HMI/LCD applications the MK40DX256VLL7 remains a strong fit.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MK40DX256VLL7 — 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 MK40DX256VLL7 (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Core, Package, RoHS Status, ADC.
MK30DX128VLL7
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MK40DX128VLL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK40DX64VLL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK10DX256VLL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MK60DX256VLL7
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
STM32F103VET6
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MK40DX256VLL7 Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M4 with FPU |
| Core Architecture | ARM Cortex-M (32-bit) |
| Maximum CPU Frequency | 72 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM (SRAM) | 64 KB |
| Supply Voltage (Vcc/Vdd) | 1.71 V to 3.6 V |
| Nhiệt độ hoạt động | -40C to +105C |
| Hộp | 100-LQFP (14 x 14 mm, 0.5 mm pitch) |
| Kiểu lắp đặt | Surface Mount |
| USB | Full-Speed USB 2.0 with on-chip transceiver |
| Segment LCD Controller | Integrated (software-configurable contrast, charge pump) |
| ADC | 16-bit SAR ADC |
| DAC | 12-bit DAC |
| DMA | Enhanced DMA (eDMA) |
| Low-Power Modes | Wait, Stop, VLPR, VLPS |
| Trạng thái RoHS | Compliant (per distributor listings) |
Cấu hình chân MK40DX256VLL7
| Chân 1 | PTE0/TXD1 — Port E bit 0 / UART1 transmit |
| Chân 2 | PTE1/RXD1 — Port E bit 1 / UART1 receive |
| Chân 3 | PTE2 — Port E bit 2 |
| Chân 4 | PTE3 — Port E bit 3 |
| Chân 5 | PTE4 — Port E bit 4 |
| Chân 6 | PTE5 — Port E bit 5 |
| Chân 7 | PTE6 — Port E bit 6 |
| Chân 8 | VSS — Ground |
| Chân 9 | VDD — Supply voltage (1.71V-3.6V) |
| Chân 10 | USB0_DP — USB Full-Speed D+ |
| Chân 11 | USB0_DM — USB Full-Speed D- |
| Chân 12 | VOUT33 — USB Voltage Regulator Output (3.3V) |
| Chân 13 | PTA0 — Port A bit 0 |
| Chân 14 | PTA1 — Port A bit 1 |
| Chân 15 | PTA2 — Port A bit 2 |
| Chân 16 | PTA3 — Port A bit 3 |
| Chân 17 | PTA4 — Port A bit 4 |
| Chân 18 | PTA5 — Port A bit 5 |
| Chân 19 | PTA6 — Port A bit 6 |
| Chân 20 | PTA7 — Port A bit 7 |
| Chân 21 | PTB0 — Port B bit 0 |
| Chân 22 | PTB1 — Port B bit 1 |
| Chân 23 | PTB2 — Port B bit 2 |
| Chân 24 | PTB3 — Port B bit 3 |
| Chân 25 | PTB4 — Port B bit 4 |
| Chân 26 | PTB5 — Port B bit 5 |
| Chân 27 | PTB6 — Port B bit 6 |
| Chân 28 | PTB7 — Port B bit 7 |
| Chân 29 | PTC0 — Port C bit 0 |
| Chân 30 | PTC1 — Port C bit 1 |
| Chân 31 | PTC2 — Port C bit 2 |
| Chân 32 | PTC3 — Port C bit 3 |
| Chân 33 | PTC4 — Port C bit 4 |
| Chân 34 | PTC5 — Port C bit 5 |
| Chân 35 | PTC6 — Port C bit 6 |
| Chân 36 | PTC7 — Port C bit 7 |
| Chân 37 | PTD0 — Port D bit 0 |
| Chân 38 | PTD1 — Port D bit 1 |
| Chân 39 | PTD2 — Port D bit 2 |
| Chân 40 | PTD3 — Port D bit 3 |
| Chân 41 | PTD4 — Port D bit 4 |
| Chân 42 | PTD5 — Port D bit 5 |
| Chân 43 | PTD6 — Port D bit 6 |
| Chân 44 | PTD7 — Port D bit 7 |
| Chân 45 | PTE7 — Port E bit 7 |
| Chân 46 | PTE8 — Port E bit 8 |
| Chân 47 | PTE9 — Port E bit 9 |
| Chân 48 | PTE10 — Port E bit 10 |
| Chân 49 | PTE11 — Port E bit 11 |
| Chân 50 | PTE12 — Port E bit 12 |
| Chân 51 | PTE13 — Port E bit 13 |
| Chân 52 | PTE14 — Port E bit 14 |
| Chân 53 | PTE15 — Port E bit 15 |
| Chân 54 | PTE16 — Port E bit 16 |
| Chân 55 | PTE17 — Port E bit 17 |
| Chân 56 | PTE18 — Port E bit 18 |
| Chân 57 | PTE19 — Port E bit 19 |
| Chân 58 | PTF0 — Port F bit 0 |
| Chân 59 | PTF1 — Port F bit 1 |
| Chân 60 | PTF2 — Port F bit 2 |
| Chân 61 | PTF3 — Port F bit 3 |
| Chân 62 | PTF4 — Port F bit 4 |
| Chân 63 | PTF5 — Port F bit 5 |
| Chân 64 | PTF6 — Port F bit 6 |
| Chân 65 | PTF7 — Port F bit 7 |
| Chân 66 | PTG0 — Port G bit 0 |
| Chân 67 | PTG1 — Port G bit 1 |
| Chân 68 | PTG2 — Port G bit 2 |
| Chân 69 | PTG3 — Port G bit 3 |
| Chân 70 | PTG4 — Port G bit 4 |
| Chân 71 | PTG5 — Port G bit 5 |
| Chân 72 | PTG6 — Port G bit 6 |
| Chân 73 | PTG7 — Port G bit 7 |
| Chân 74 | PTH0 — Port H bit 0 |
| Chân 75 | PTH1 — Port H bit 1 |
| Chân 76 | PTH2 — Port H bit 2 |
| Chân 77 | PTH3 — Port H bit 3 |
| Chân 78 | PTH4 — Port H bit 4 |
| Chân 79 | PTH5 — Port H bit 5 |
| Chân 80 | PTH6 — Port H bit 6 |
| Chân 81 | PTH7 — Port H bit 7 |
| Chân 82 | PTI0 — Port I bit 0 |
| Chân 83 | PTI1 — Port I bit 1 |
| Chân 84 | PTI2 — Port I bit 2 |
| Chân 85 | PTI3 — Port I bit 3 |
| Chân 86 | PTI4 — Port I bit 4 |
| Chân 87 | PTI5 — Port I bit 5 |
| Chân 88 | PTI6 — Port I bit 6 |
| Chân 89 | NC — Not connected |
| Chân 90 | NC — Not connected |
| Chân 91 | VDDA — Analog supply |
| Chân 92 | VSSA — Analog ground |
| Chân 93 | VREFH — ADC voltage reference high |
| Chân 94 | VREFL — ADC voltage reference low |
| Chân 95 | DAC0_OUT — 12-bit DAC output |
| Chân 96 | RESET_b — Reset (active low) |
| Chân 97 | TCLK0 — Timer clock input 0 |
| Chân 98 | EXTAL — External crystal oscillator input |
| Chân 99 | XTAL — External crystal oscillator output |
| Chân 100 | VSS — Ground |
Ứng dụng tiêu biểu
MK40DX256VLL7 phù hợp cho 7 Áp dụngs: Segment LCD Metering (Electricity/Water/Gas), Home Appliance HMI (Washers, Ovens, HVAC), USB Industrial Sensor / Data Acquisition Node, Medical Infusion Pump / Diagnostic Display, Point-of-Sale (POS) Terminal with LCD, Battery-Powered IoT Edge Node with LCD, Automotive Instrument Cluster / Dashboard Sub-display.
Segment LCD Metering (Electricity/Water/Gas)
The MK40DX256VLL7's integrated Segment LCD controller with on-chip charge pump and software-configurable contrast makes it a natural fit for residential and commercial metering HMIs. Placed as the system MCU between the metering front-end (analog front-end IC or shunt + op-amp) and the glass LCD, the part drives up to several dozen segments without an external LCD driver, eliminating a BOM line and reducing PCB area. The 72 MHz Cortex-M4 with FPU handles tariff calculation, tamper detection, and TOU scheduling in firmware, while Full-Speed USB enables AMR (automated meter reading) data upload. The 1.71-3.6V wide supply range also supports single-cell battery or supercapacitor backup rails for outage logging.
Được đề xuất
Home Appliance HMI (Washers, Ovens, HVAC)
White-goods appliances combine pushbutton/rotary inputs with segment-LCD or icon-LCD displays, plus USB for service diagnostics - exactly the MK40DX256VLL7's sweet spot. The Cortex-M4 FPU accelerates motor-control loops in inverter washing machines and dishwasher pumps while the same core serves the HMI display via the integrated LCD controller. Full-Speed USB enables firmware updates and service logs without opening the chassis. The 100-LQFP package is hand-solderable on the heavier copper used in appliance PCBs, and the 105C temperature rating covers oven-control and dryer environments.
Được đề xuất
USB Industrial Sensor / Data Acquisition Node
Industrial sensors and DAQ nodes benefit from the MK40DX256VLL7's Full-Speed USB for direct PC connectivity without an external bridge IC. The 16-bit SAR ADC provides precision analog measurement for strain gauges, RTDs, and process signals, while the 12-bit DAC supports excitation or analog output channels. The 256KB Flash stores calibration tables and linearization curves, and 64KB SRAM buffers USB bulk transfers. The 100-LQFP package is easy to lay out on a 4-layer industrial backplane, and the -40C to +105C range covers factory-floor environments.
Được đề xuất
Medical Infusion Pump / Diagnostic Display
Medical infusion pumps, blood-pressure monitors, and bedside diagnostics combine a precise sensor front-end with an LCD readout and USB service port - again fitting the MK40DX256VLL7's profile. The Cortex-M4 FPU runs audio prompts and DSP filtering for pulse oximetry or ECG, and the 256KB Flash stores drug libraries. USB enables nurse-station tethering and patient-data export. The 100-LQFP package's 14x14 mm footprint is compatible with medical-grade PCB layouts that require wide trace spacing for creepage and clearance.
Được đề xuất
Point-of-Sale (POS) Terminal with LCD
POS terminals and handheld payment devices benefit from the MK40DX256VLL7's combination of Full-Speed USB (for printer/scanner peripherals), segment LCD (for transaction amount and status display), and the Cortex-M4 (for cryptographic acceleration in payment flows). The 100-LQFP package is easy to assemble in low-volume specialty terminals. The 72 MHz speed is sufficient for contactless payment protocol stacks, and 256KB Flash accommodates PIN-encryption firmware plus EMV kernels.
Được đề xuất
Battery-Powered IoT Edge Node with LCD
IoT edge nodes that display local status on a small segment LCD (thermostats, smart locks, sensor hubs) can run on the MK40DX256VLL7 with its low-power modes (Wait, Stop, VLPR, VLPS). The integrated Segment LCD controller means the LCD glass remains visible while the core sleeps in VLPS, with periodic wake-ups driven by the low-leakage wakeup unit. The 1.71V minimum supply supports direct Li-MnO2 or Li-SOCl2 primary cells common in smart locks. USB is reserved for service/firmware-update sessions.
Được đề xuất
Automotive Instrument Cluster / Dashboard Sub-display
The MK40DX256VLL7's automotive-relevant peripherals - Segment LCD, CAN-style timers, 16-bit ADC for sensor reading, and 105C temperature - make it suitable for non-safety instrument cluster sub-displays (odometer, trip computer, HVAC panel). Note that the MK40DX256VLL7 itself is not AEC-Q100 qualified; for safety-critical cluster functions NXP recommends the S12/S32 families. This use case is best suited to agricultural, off-road, or powersports vehicles where the lower-cost industrial MK40DX256VLL7 is acceptable.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MK40DX256VLL7 — 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 | MK30DX128VLL7 | MK40DX128VLL7 | MK40DX64VLL7 | MK10DX256VLL7 | MK60DX256VLL7 | STM32F103VET6 |
|---|---|---|---|---|---|---|---|
| Package | 100-LQFP (14x14 mm) | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | STMicroelectronics |
| 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 | ARM Cortex-M4 with FPU | ARM Cortex-M3 (no FPU) |
| Maximum CPU Frequency | 72 MHz | 72 MHz | 72 MHz | 72 MHz | 72 MHz | 100 MHz | 72 MHz |
| Flash Memory | 256 KB | 128 KB | 128 KB | 64 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 64 KB | 32 KB | 32 KB | 16 KB | 64 KB | 64 KB | 64 KB |
| USB | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | Full-Speed USB 2.0 | No USB | Full-Speed + High-Speed USB 2.0 | Full-Speed USB 2.0 |
| Segment LCD Controller | Integrated | Integrated | Integrated | Integrated | Not integrated | Not integrated | Not integrated (external driver needed) |
| Ethernet MAC | No | No | No | No | No | Yes (10/100 Mbit) | No |
| Supply 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 | 1.71 V to 3.6 V | 2.0 V to 3.6 V |
Bảo phân biệt quan trọng
- Integrated Segment LCD controller eliminates external LCD driver IC (vsSTM32F103VET6)
- Cortex-M4 with FPU versus Cortex-M3 (vsSTM32F103VET6)
- Same-package upgrade to K60 with Ethernet MAC (vsMK60DX256VLL7)
- Wider supply voltage range supports primary-cell batteries (vsSTM32F103VET6)
Ghi chú thiết kế
Place a 1 uF X7R ceramic decoupling capacitor within 5 mm of each VDD pin and a bulk 10 uF tantalum or ceramic at the board supply entry. According to the NXP K40 reference manual, the MCU has multiple VDD/VSS pairs - bypassing each pair separately reduces digital switching noise coupling into the analog VREFH/VREFL rail. Use separate analog (VDDA) and digital (VDD) planes tied at a single ferrite-bead point to keep ADC noise below 1 LSB.
The 100-LQFP (14x14 mm, 0.5 mm pitch) package requires 4-layer PCB for clean USB signal integrity. Route USB0_DP and USB0_DM as a 90-ohm differential pair with matched length, and place the 27 ohm series termination resistors within 4 mm of the MCU pins. Avoid routing any high-speed signal (Flexbus, Segment LCD COM/SEG) across the USB differential pair to keep emissions below EN 55022 Class B.
Do not leave the RESET_b pin floating - it must be pulled up to VDD through a 10 kohm resistor with a 100 nF cap to ground for noise immunity. Do not exceed 3.6V on VDD - the K40 internal ESD clamps turn on above 3.6V and can cause latch-up. When migrating from K10 to K40 or K30, reconfigure the USB pins in SIM_PINSEL because their default function differs across sub-families; failure to do so is the #1 cause of 'USB not enumerating' support tickets on Kinetis designs.
Estimated: At 72 MHz system clock, edge rates on Flexbus and Segment LCD outputs can exceed 4 ns. Route them away from analog inputs (ADC channels, DAC0_OUT) by at least 4 mm or guard them with a ground via fence on both sides. Place a 100 nF cap at VREFH to suppress high-frequency noise from the charge pump; expect VREFH noise of <5 mVpp with proper bypassing according to the K40 reference manual (K40P81M100RM).
Thông tin tuân thủ
RoHS and lead-free status confirmed by distributor listings (DigiKey, Mouser). MK40DX256VLL7 is NOT AEC-Q100 qualified - choose S12 or S32K1xx families for AEC-Q100 automotive applications. Halogen-free status not explicitly stated in web data.
