PIC32MX340F128HT-80I/MR
PIC32MX340F128HT-80I/MR - 80MHz 32-bit MCU 128KB Flash | Microchip
The Microchip Technology PIC32MX340F128HT-80I/MR is a 32-bit MIPS M4K microcontroller running up to 80 MHz, with 128 KB of Flash and 32 KB of SRAM, housed in a 64-pin QFN (MR) package rated -40C to +85C. It operates from 2.5 V to 3.6 V and offers 53 digital I/O pins plus dedicated analog and communication peripherals.
What is a 32-bit microcontroller? A 32-bit MCU is an embedded processor with a 32-bit wide data path, internal Flash for program storage, and SRAM for runtime data, plus integrated peripherals such as ADC, timers, UART, SPI, and I2C. The PIC32MX3xx family sits in the hierarchy: microcontroller -> 32-bit MCU -> MIPS M4K core -> PIC32MX sub-family -> power-conscious industrial/consumer devices. Compared to 8-bit/16-bit MCUs, a 32-bit core executes arithmetic and DSP-like operations in fewer cycles, supporting higher-throughput control loops, USB stacks, and graphical user interfaces.
Key features of the PIC32MX340F128HT-80I/MR include a 10-bit ADC with up to 16 channels and 1 Msps conversion rate, two I2C, two SPI, two UART interfaces, five 16-bit timers/counters, a Parallel Master Port (PMP) for graphics or external memory, and a real-time clock-calendar with external 32 kHz crystal support. The device integrates a JTAG debug port and trace interface aligned with the MIPS debug specification, and offers multiple power-saving modes such as Idle, Sleep, and deep Sleep.
Architecturally, the chip combines a single-cycle MIPS32 M4K integer core with a 5-stage pipeline, prefetch cache controller, and a multi-vector interrupt controller. The 128 KB Flash is split into program Flash and a separate boot Flash region for safe firmware updates, and the 32 KB SRAM is accessible as a unified data space. The peripherals are routed to the pins through Microchip's Peripheral Pin Select (PPS) subsystem on select lines, giving flexibility to remap digital functions.
Typical applications include industrial control and HMI panels, USB device/host peripherals, sensor aggregation nodes, low-cost graphics terminals, motor control and lighting controllers, and battery-powered consumer devices with USB connectivity. The 64-pin QFN footprint suits space-constrained boards that still need substantial GPIO and analog channels.
When designing, ensure the supply is decoupled with 100 nF plus bulk capacitance, keep analog traces short and away from switching nodes, and route the 8 MHz primary crystal within 5 mm of the OSCI/OSCO pads with a guard ring. For low-power designs, use Sleep mode aggressively and gate peripherals via the on-chip peripheral disable registers to minimize quiescent draw.
This page consolidates current distributor pricing, drop-in same-package alternatives, application guidance, and design notes beyond the manufacturer datasheet, giving procurement and engineering teams a single source for evaluation and BOM decisions.
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