PIC32MX550F256LT-I/PT
PIC32MX550F256LT-I/PT - 32-bit MCU 256KB Flash 32KB RAM | Microchip
The Microchip Technology PIC32MX550F256LT-I/PT is a 32-bit MIPS32 M4K microcontroller with 256KB Flash, 32KB RAM, running up to 50 MHz (83 DMIPS), packaged in a 100-pin TQFP (12x12 mm). It integrates USB 2.0 full-speed device/host/OTG, two I2S, four SPI, two I2C, and a CAN 2.0B interface, making it a connectivity-rich general-purpose MCU. The 'L' suffix denotes the 100-pin variant, and 'T' denotes tape-and-reel packaging.
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.
USD $4.16
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