MK51DX256CLL7 - 72MHz Cortex-M4 MCU, 256KB Flash | NXP
料号： MK51DX256CLL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.23 | $18.23 |
| 10 | $17.5 | $175.00 |
| 100 | $16.4 | $1,640.00 |
| 500 | $15.2 | $7,600.00 |
| 1,000 | $14.1 | $14,100.00 |
MK51DX256CLL7 概述
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and peripherals into one chip, forming the lowest level of the embedded system hierarchy: MCU -> embedded processor -> microprocessor-based system. The Kinetis K51 family targets measurement applications by adding a Segment LCD controller, USB, and high-precision analog integration on top of the mid-performance Kinetis portfolio.
Key features of the MK51DX256CLL7 include a floating-point-capable Arm Cortex-M4 pipeline at 72 MHz, USB OTG connectivity, a segment LCD driver for glass displays, and flexible low-power peripheral operation. Peripherals include DMA, I2S, low-voltage detection, power-on reset, PWM, and a watchdog timer, giving designers a complete signal-chain controller in one device.
Connectivity is provided by I2C, IrDA, SPI, UART/USART, USB, and USB OTG interfaces. The FlexMemory architecture provides scalable Flash and data-storage options, and the part is industrial temperature graded for harsh environments. The 100-LQFP gull-wing, square package suits both hand assembly and standard surface-mount reflow lines.
Typical applications include utility metering with segment LCD displays, portable medical measurement instruments, industrial human-machine interfaces, and USB-connected data-acquisition nodes. The segment LCD controller eliminates a dedicated LCD driver IC, while the Cortex-M4 DSP instructions handle filtering and FFT workloads locally.
When designing with this MCU, budget the 256 KB Flash against code growth and consider pin-compatible Kinetis family members with larger Flash for a migration path; all Kinetis K-series devices share NXP's MCUXpresso enablement and software SDK.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： MK51DX256CLL7 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MK51DX256CLL7 （相同外形与封装尺寸） ——差异在于 Package, ADC, Connectivity, Core Architecture, Core Processor.
快速对比工具——选择替代料号进行并排对比：
MK51DN512CLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK51DX128CLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK30DX256VLL7
✅ 直接替换📋 参考替代料（不在目录中）
MK10DX256VLL7
✅ 直接替换📋 参考替代料（不在目录中）
MK51DX256VLL7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MK51DX256CLL7 最大额定值与电气特性
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-bit |
| Max Clock Speed | 72 MHz |
| Program Memory Size | 256 KB (256K x 8) Flash |
| RAM Size | 64 KB SRAM |
| Series | Kinetis K50/K51 |
| Connectivity | I2C, IrDA, SPI, UART/USART, USB, USB OTG |
| Peripherals | DMA, I2S, LVD, POR, PWM, WDT, Segment LCD |
| Number of I/O | 57 |
| 封装 | 100-LQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| Terminal Form | Gull Wing |
| Package Shape | Square (FQFP) |
| Temperature Grade | Industrial |
| Part Status | Active |
MK51DX256CLL7 square (fqfp) 引脚配置指南
MK51DX256CLL7（square (fqfp) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： MK51DX256CLL7.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MK51DX256CLL7 适用于 6 应用s: Utility Metering (Electricity/Gas/Water), Portable Medical Measurement Instruments, Industrial Human-Machine Interfaces (HMI), USB Data-Acquisition Nodes, Building Automation and Smart Home Panels, Test and Measurement Handhelds.
Utility Metering (Electricity/Gas/Water)
The MK51DX256CLL7 fits utility metering because the K51 measurement family integrates a segment LCD controller that drives meter glass directly, eliminating a dedicated LCD driver IC and its wiring. The 72 MHz Cortex-M4 core with DSP instructions executes RMS, FFT, and tariff calculations locally, while USB OTG enables field configuration and meter-reading downloads. In a typical meter, the MCU samples voltage/current via its high-precision analog front end, computes consumption, and updates the segment LCD at low refresh rates that exploit the family's flexible low-power modes. Designers should budget the 256 KB Flash for metrology firmware plus communication stacks; the pin-compatible 512 KB MK51DN512CLL7 provides headroom for DLMS/COSEM protocol growth without a PCB change.
推荐
Portable Medical Measurement Instruments
Battery-powered medical measurement devices such as glucose monitors, pulse oximeters, and handheld diagnostic testers benefit from the MK51DX256CLL7's combination of segment LCD display driving, high-precision analog integration, and low-power operation. The K51 family's flexible low-power peripheral options let the LCD and ADC run while the core sleeps, extending battery life in always-on instruments. The 72 MHz Cortex-M4 with DSP instructions performs real-time filtering of physiological signals, and USB OTG supports data upload to clinical systems. The industrial temperature grade and 100-LQFP gull-wing package withstand repeated handling and cleaning. Designers should implement the USB battery-charging detection features for patient-convenient recharging and reserve Flash capacity for FDA-auditable logging code.
推荐
Industrial Human-Machine Interfaces (HMI)
Panel meters and small industrial HMIs use the MK51DX256CLL7 to combine a segment LCD, tactile-key scanning via its 57 GPIO, and USB connectivity for configuration. The 100-LQFP 14x14 mm footprint fits standard industrial PCB processes, and the watchdog timer, power-on reset, and low-voltage detection peripherals provide the supervisory robustness demanded in factory environments. At 72 MHz, the Cortex-M4 handles Modbus RTU stacks on the UART/USART while displaying process values on the segment LCD, and the DMA offloads serial transfers to keep CPU load low. The industrial temperature grade suits control-cabinet installations. A firmware watchdog plus brown-out configuration from the LVD peripheral is recommended for unattended deployments.
推荐
USB Data-Acquisition Nodes
The MK51DX256CLL7 serves as a compact USB data-acquisition controller: USB OTG allows it to appear as a device to a PC or act as a host reading USB flash storage, while its high-precision analog inputs digitize sensor channels. The DMA controller moves ADC samples to the 64 KB SRAM without CPU intervention, sustaining streaming rates that the 72 MHz Cortex-M4 then filters using DSP instructions. Compared to an MCU-plus-external-USB-chip solution, the integrated USB reduces BOM cost and board area. Typical deployments include portable environmental loggers and bench measurement pods. Designers should use the I2S/DMA combination for audio-band acquisition and verify USB compliance using NXP's reference USB stack in MCUXpresso SDK.
推荐
Building Automation and Smart Home Panels
Thermostats, room controllers, and smart-home panels leverage the MK51DX256CLL7's segment LCD for temperature and setpoint display, its I2C and SPI ports for sensor and actuator expansion, and USB for commissioning. The K51 family's flexible low-power modes allow the display to remain active with the core in sleep, meeting energy budgets for battery-assisted wall units. The 57 GPIO lines directly drive relays, triacs, and keypads, while UART links to RS-485 transceivers for building bus networks. The 72 MHz Cortex-M4 runs PID control loops with margin for protocol stacks. Using the pin-compatible family, designers can trade Flash size (128/256/512 KB) across product tiers without changing the PCB layout.
推荐
Test and Measurement Handhelds
Handheld multimeters, cable testers, and environmental meters exploit the MK51DX256CLL7's measurement-oriented feature set: high-precision analog integration for input conditioning, DSP instructions for calibration and FFT-based analysis, and a segment LCD that reads clearly in bright field conditions. USB OTG enables firmware updates and logged-data offload in the field, and the industrial temperature grade tolerates outdoor use. The 64 KB SRAM buffers measurement sweeps, while DMA-driven ADC sampling keeps timing deterministic. Because the K51 family shares enablement with the wider Kinetis portfolio, measurement algorithms port easily across family members. Battery-life-critical designs should exploit the flexible low-power peripheral operation and gate unused USB and I2S clocks.
推荐
推荐产品汇总
工程参考数据： MK51DX256CLL7 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MK51DN512CLL7 | MK51DX128CLL7 | MK30DX256VLL7 | MK10DX256VLL7 |
|---|---|---|---|---|---|
| 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 |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | ARM Cortex-M4, 72 MHz | ARM Cortex-M4, 72 MHz | ARM Cortex-M4, 72 MHz | ARM Cortex-M4, 72 MHz | ARM Cortex-M4, 72 MHz |
| Flash | 256 KB | 512 KB | 128 KB | 256 KB | 256 KB |
| SRAM | 64 KB | 64 KB | 32 KB | 64 KB | 64 KB |
| Segment LCD Controller | Yes | Yes | Yes | No | No |
关键差异点
- Integrated segment LCD controller （对比 MK10DX256VLL7)
- USB OTG dual-role connectivity （对比 MK51DX128CLL7)
- Balanced memory for metering firmware （对比 MK51DN512CLL7)
- DSP-capable core for measurement math （对比 MK30DX256VLL7)
设计说明
The 100-LQFP 14x14 mm package requires a standard 0.5 mm pitch land pattern; follow IPC-7351 footprint guidelines for gull-wing FQFP. Place 100 nF ceramic decoupling capacitors at each VDD/VSS pin pair, within 2 mm of the pins, plus one bulk 10 uF capacitor near the regulator. The exposed center of the LQFP is free for a ground pour - stitch it to the ground plane with vias. Route the USB D+/D- as a 90-ohm differential pair with length matching better than 1 mm if USB OTG is used.
Power the MCU from a clean 3.3 V rail within the Kinetis K-series supply range specified in the NXP datasheet. Separate the analog supply domain feeding the high-precision analog peripherals with an LC filter or ferrite bead from the digital rail, since ADC accuracy degrades with digital switching noise. Use the on-chip LVD and POR peripherals with proper threshold selection; do not rely on external reset ICs alone. Estimated: with a 3.3 V rail and typical run-mode current in the tens-of-mA range per Kinetis family behavior, a 100 mA LDO provides adequate margin, but confirm exact run/stop currents against the manufacturer datasheet.
Three common mistakes: (1) assuming all K51 family members are pin-identical - verify the suffix (C = segment LCD) against your PCB, since K10/K30 100-LQFP parts differ in LCD pin multiplexing; (2) overrunning the 256 KB Flash after adding USB stacks and LCD graphics - plan the MK51DN512CLL7 migration path early since it is pin-compatible; (3) omitting pull configuration on unused GPIO, which increases leakage in low-power modes. Enable the watchdog timer during bring-up, not as a final-step addition.
合规信息
The NXP product page lists an Environmental Quality section, but specific RoHS/REACH/lead-free status for MK51DX256CLL7 was not present in the verified web data snippets. Consult the NXP product page Environmental Quality tab for current compliance certificates.