PIC32MX550F256LT-I/PT - 32-bit MCU 256KB Flash 32KB RAM | Microchip
料号： PIC32MX550F256LT-I/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.16 | $4,160.00 |
PIC32MX550F256LT-I/PT 概述
A 32-bit microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory (Flash), data memory (SRAM), and configurable peripherals into one package. The PIC32MX5xx family uses the MIPS32 M4K RISC architecture, sitting within the broader hierarchy of microcontrollers -> embedded controllers -> semiconductor ICs. It targets applications needing USB connectivity, graphical user interfaces (via PMP), and moderate DSP performance in a single chip.
Key features include 256KB Flash with live update support, 32KB SRAM, 8-channel DMA, 16-bit Parallel Master Port (PMP) with dual read/write buffers for graphics, Peripheral Pin Select (PPS) for flexible peripheral pin mapping, USB 2.0 full-speed with on-chip transceiver, CTMU for touch sensing, RTCC with calendar/timestamp, and six UART modules. The industrial temperature range is -40C to +85C, suitable for harsh-environment embedded systems.
The PIC32MX550 uses a 5-stage MIPS32 M4K pipeline with single-cycle multiply, hardware divide, and an enhanced JTAG debug port. The 256KB Flash supports self-programming for bootloader/field-update use cases, and 32KB SRAM (with up to 4KB DMA-allocated) provides ample headroom for USB stacks, graphics framebuffers, and TCP/IP. The integrated 1.5 kB instruction cache and pre-fetch buffer accelerate Flash execution.
Typical applications include USB peripherals (barcode scanners, POS terminals), industrial control with CAN connectivity, low-cost graphical HMI panels, audio streaming devices via I2S, and embedded web servers. The wide peripheral set reduces external component count, lowering BOM cost in space-constrained designs.
When designing with this MCU, allocate pins carefully using Peripheral Pin Select - default pin mappings may conflict with USB or PMP pins. Provide a stable 24 MHz crystal or use the internal 8 MHz FRCDIV oscillator with USB FS mode requiring 48 MHz PLL accuracy. Decouple all VDD/VSS pairs with 100 nF ceramic capacitors placed within 3 mm of each pin pair.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, with same-brand Microchip variants (PIC32MX550F256L-I/PT, PIC32MX550F256LT-50I/PT, PIC32MX570F256L-I/PT, PIC32MX270F512L-I/PT) listed in priority order for drop-in replacement.
直接替换替代料： PIC32MX550F256LT-I/PT ——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： PIC32MX550F256LT-I/PT （相同外形与封装尺寸） ——差异在于 Package, ADC, USB, Operating Temperature, Parallel Master Port (PMP).
快速对比工具——选择替代料号进行并排对比：
PIC32MX550F256L-I/PT
✅ 直接替换✓ 有现货
$3.78 / 个
查看数据手册 →PIC32MX550F256LT-50I/PT
✅ 直接替换✓ 有现货
$4.2 / 个
查看数据手册 →PIC32MX550F256H-I/PT
✅ 直接替换✓ 有现货
$3.48 / 个
查看数据手册 →PIC32MX550F256H-50I/PT
✅ 直接替换✓ 有现货
$3.05 / 个
查看数据手册 →PIC32MX570F256L-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC32MX270F512L-I/PT
✅ 直接替换📋 参考替代料（不在目录中）
PIC32MX550F256LT-I/PT 最大额定值与电气特性
| Core | MIPS32 M4K (32-bit RISC) |
| Maximum CPU Speed | 50 MHz (83 DMIPS) |
| Program Memory (Flash) | 256 KB |
| Data Memory (SRAM) | 32 KB |
| Operating Voltage (VDD) | 2.3 V to 3.6 V |
| I/O Pins | 85 |
| USB | USB 2.0 Full-Speed Device/Host/OTG with on-chip transceiver |
| CAN | CAN 2.0B, 1 module |
| SPI | 4 modules (with audio modes via I2S) |
| I2C | 2 modules |
| UART | 6 modules |
| I2S | 2 modules |
| Parallel Master Port (PMP) | Yes, 16-bit with dual buffers |
| DMA Channels | 8 |
| ADC | 10-bit, 1 Msps, up to 28 channels |
| Comparators | 3 |
| CTMU | Yes (touch sensing) |
| RTCC | Yes with calendar/timestamp |
| 工作温度 | -40 C to +85 C (Industrial) |
| 封装 | 100-pin TQFP (PT), 12x12 mm, 0.4 mm pitch |
| Peripheral Pin Select (PPS) | Yes |
| JTAG Debug | Enhanced JTAG with trace (MTRACE) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
PIC32MX550F256LT-I/PT 100-pin tqfp (pt), 12x12 mm, 0.4 mm pitch 引脚配置指南
PIC32MX550F256LT-I/PT（100-pin tqfp (pt), 12x12 mm, 0.4 mm pitch 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： PIC32MX550F256LT-I/PT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PIC32MX550F256LT-I/PT 适用于 6 应用s: USB Barcode Scanner, Industrial CAN Gateway, Graphical HMI Touch Panel, USB Audio Streaming Device, Embedded Web Server (IoT Gateway), Automotive Infotainment Accessory.
USB Barcode Scanner
The PIC32MX550F256LT-I/PT fits USB barcode scanners due to its integrated USB 2.0 Full-Speed device/host/OTG controller with on-chip transceiver, eliminating the need for an external FS PHY. Its 50 MHz MIPS32 M4K core delivers 83 DMIPS, sufficient to decode 1D/2D barcode images from a CMOS sensor over PMP, plus handle USB HID keyboard or CDC-ACM transport. The 256 KB Flash accommodates firmware for decoding algorithms (Code128, QR, Data Matrix) and USB stacks simultaneously, while 32 KB SRAM handles image line buffers. Six UART modules allow auxiliary scanner integrations (RFID readers, scale interfaces). Industrial -40 C to +85 C temperature range suits warehouse and POS environments. PPS flexibility lets USB coexist with debug JTAG on the same PCB.
推荐
Industrial CAN Gateway
The PIC32MX550F256LT-I/PT serves CAN-to-UART/USB industrial gateways, integrating one CAN 2.0B module, six UART modules, and USB 2.0 FS in a single chip. Engineers can implement a J1939 or CANopen stack in 256 KB Flash while forwarding traffic to a host PC over USB CDC-ACM. The 50 MHz MIPS core handles 1 Mbps CAN traffic with interrupt-driven parsing, and 32 KB SRAM provides CAN message buffering without dropping frames. 8-channel DMA offloads SPI/UART transfers, freeing CPU for protocol processing. -40 C to +85 C operation suits factory-floor deployments. PPS allows flexible pin assignment for connector pinouts.
推荐
Graphical HMI Touch Panel
The PIC32MX550F256LT-I/PT suits low-cost graphical HMI panels (3.5-5 inch TFT) via its 16-bit Parallel Master Port (PMP) with dual read/write buffers for driving ST7789V or ILI9488 LCD controllers at full frame rate. CTMU (Charge Time Measurement Unit) handles up to 28 touch-sensing channels without external touch controller ICs, reducing BOM cost. The 256 KB Flash stores GUI assets, fonts, and touch calibration tables; 32 KB SRAM holds one full framebuffer at reduced color depth. Two I2S modules support audio feedback. USB device mode enables firmware update from PC. Industrial temperature and 100-TQFP package fit fanless enclosed HMIs.
推荐
USB Audio Streaming Device
The PIC32MX550F256LT-I/PT enables USB audio streaming devices (USB headsets, USB DACs, USB microphones) using its USB 2.0 Full-Speed device controller paired with two I2S modules for simultaneous playback and record at 48 kHz / 24-bit. The 50 MHz MIPS32 M4K core has sufficient headroom for 8 kB sample buffers plus USB isochronous endpoint handling. Four SPI modules allow external flash/SD card storage for firmware updates. 32 KB SRAM holds USB descriptors, audio buffers, and stack variables. Industrial -40 C to +85 C operation suits infotainment accessories. PPS lets I2S and USB share I/O banks without conflict.
推荐
Embedded Web Server (IoT Gateway)
The PIC32MX550F256LT-I/PT powers small-form-factor IoT gateways running lightweight TCP/IP stacks (TCP/IP Lite, Microchip MLA) over USB CDC-ECM or Ethernet-via-SPI (ENC28J60). 256 KB Flash holds HTTP server, REST API handlers, MQTT client, and TLS lite footprint; 32 KB SRAM keeps socket buffers, JSON parse trees, and Ethernet frame queues. Six UART modules bridge to sub-GHz radios, RS485 sensor buses, and debug consoles. CTMU monitors temperature/humidity sensors via capacitance measurement. -40 C to +85 C operation suits outdoor enclosures. PPS flexibility lets SPI for Ethernet coexist with USB device port.
推荐
Automotive Infotainment Accessory
The PIC32MX550F256LT-I/PT fits automotive infotainment accessories (USB chargers with monitoring, OBD-II scanners, CAN-to-USB diagnostic tools) thanks to CAN 2.0B, USB 2.0 FS, and -40 C to +85 C industrial temperature range covering cabin environments. The 50 MHz core decodes CAN J1939 traffic and forwards over USB at 1 Mbps simultaneously. 256 KB Flash stores OBD-II PIDs, DTC tables, and USB HID/COM composite stacks. RTCC logs timestamps for diagnostic events. PPS enables shared SPI between external flash and OBD transceiver. For under-hood applications requiring -40 C to +125 C, an AEC-Q100 variant such as PIC32MX570F256L-I/PT should be selected.
推荐
推荐产品汇总
工程参考数据： PIC32MX550F256LT-I/PT ——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 | PIC32MX550F256L-I/PT | PIC32MX550F256LT-50I/PT | PIC32MX550F256H-I/PT | PIC32MX570F256L-I/PT | PIC32MX270F512L-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-TQFP (PT), 12x12 mm | 100-TQFP (PT), 12x12 mm - same | 100-TQFP (PT), 12x12 mm - same | 100-TQFP (PT), 12x12 mm - same | 100-TQFP (PT), 12x12 mm - same | 100-TQFP (PT), 12x12 mm - same |
| Core | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | MIPS32 M4K, 32-bit | |
| Max CPU Speed | 50 MHz (83 DMIPS) | 50 MHz | 50 MHz | 50 MHz | 50 MHz | |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB | 512 KB (+100%) | |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB (+100%) | |
| USB 2.0 FS | Yes (integrated PHY) | Yes (integrated PHY) | Yes (integrated PHY) | Yes (integrated PHY) | No (external PHY required) | |
| CAN 2.0B | Yes, 1 module | Yes, 1 module | Yes, 1 module | Yes, 1 module | Yes, 1 module | |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
关键差异点
- USB 2.0 FS with on-chip PHY eliminates external transceiver （对比 PIC32MX270F512L-I/PT)
- 256 KB Flash vs 128 KB on entry-level PIC32MX3xx （对比 PIC32MX360F256L-I/PT)
- 83 DMIPS at 50 MHz outperforms PIC24/dsPIC33 family （对比 dsPIC33EP256MC502-I/SP)
- Six UART modules vs four on smaller PIC32 variants （对比 PIC32MX450F256L-I/PT)
设计说明
Provide a stable 3.3 V supply within +/-3% tolerance on all VDD pins. The PIC32MX550F256LT-I/PT integrates an internal 1.8 V core regulator that draws from VDD; high VDD ripple (>50 mVpp) can cause core-voltage instability and erratic behavior. Place one 10 uF bulk ceramic (X5R/X7R) and one 100 nF ceramic decoupling cap per VDD/VSS pair, with the 100 nF cap within 3 mm of each pin pair. The USB transceiver has dedicated VUSB3V3 pin requiring 100 nF decoupling; for OTG mode also bias VUSB with internal 3.3V LDO output.
Place the 24 MHz primary oscillator crystal (or resonator) within 5 mm of the OSC1/OSC2 pins with short, symmetric traces and a guard ring tied to GND. USB D+/D- traces must be 90-ohm differential impedance matched with length-matching within 2 mm, and must not cross any high-speed digital signals. JTAG/TRACE pins should be brought to a 0.1-inch header for MPLAB Snap / ICD 4 debugging. Keep the analog AVDD/AVSS pair isolated from noisy digital VDD traces with a ferrite bead or filter pi-network.
USB peripheral mode requires a 1.5 kohm pull-up on D+ (selectable via PPS to a specific I/O pin), and host mode requires 15 kohm pull-downs on both D+ and D-. Omitting these resistors is the most common USB enumeration failure cause. For PMP, remember the 16-bit PMP uses many pins and conflicts with JTAG TRACE; PPS remapping is not available on PMP - plan pin allocation upfront. The CTMU requires precise time-base calibration via T1CK and ADC-CTMU channels; consult Microchip AN1250 for touch-button layout.
The 100-TQFP (PT) package has typical theta_JA around 50 C/W on a standard 4-layer JEDEC test board. At maximum CPU activity (50 MHz, all peripherals active), the chip dissipates approximately 80-120 mW internally, yielding a junction temperature rise of 5-6 C above ambient - well within the -40 C to +85 C industrial limit. For sealed enclosures with no airflow, derate ambient by 5-10 C and verify with a thermocouple. The internal core-voltage regulator drops around 80 mW worst case (full USB + ADC + DMA).
合规信息
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - this is industrial-grade. For AEC-Q100 automotive applications, contact Microchip for PIC32MX570-Q1 variant. Halogen-free per Microchip green compliance statement.
