PIC24FJ256GL410T-I/PT
PIC24FJ256GL410T-I/PT - 256KB Flash LCD MCU 100-TQFP | Microchip
The Microchip PIC24FJ256GL410T-I/PT is a 16-bit eXtreme Low-Power microcontroller from the PIC24FJ GL4 family with 256KB of Flash, 32KB RAM, an integrated LCD controller, full-speed USB, and a 16 MIPS CPU core, packaged in a 100-pin TQFP (12x12 mm). The "GL4" family introduces a Dual-Partition Flash architecture that supports real-time Over-The-Air (OTA) firmware updates and EEPROM emulation, making it well suited to field-upgradable IoT nodes and connected sensors.
What is a 16-bit microcontroller? A 16-bit MCU is a programmable processor with a 16-bit data path, register file, and ALU, sitting between 8-bit MCUs (lower cost, lower performance) and 32-bit MCUs (higher performance, higher power). The PIC24FJ family targets low-power, mixed-signal embedded applications that need more headroom than 8-bit parts but do not require an ARM Cortex-M core. Within Microchip's taxonomy, the PIC24FJ GL4 family occupies the "ultra-low-power, LCD + USB" niche, bridging the gap between the PIC24FJ GB4 family (more I/O, less USB focus) and the PIC24FJ GA7 family (lower power, no USB).
Key features include 256KB (256K x 8) of Flash with error correction, 32KB SRAM, up to 86 general-purpose I/O, an integrated segmented LCD driver, a full-speed USB 2.0 device/host/OTG controller, a 12-bit ADC, multiple Core Independent Peripherals (CIPs) including CLC, PWM, and RTCC, and a 2.0V to 3.6V supply range. The CPU runs up to 32MHz at 16 MIPS, with a hardware multiplier and divider. Deep-sleep currents are in the microamp range, supporting battery-powered designs.
The Dual-Partition Flash architecture is the standout technical feature: two independent Flash arrays allow one partition to execute code while the other is being reprogrammed, eliminating update downtime. Combined with the integrated LCD and USB controllers, this architecture simplifies the BOM for connected HMI, meter, and sensor applications that require firmware updateability in the field.
Typical applications include battery-powered IoT sensors with LCD displays, smart utility meters, home automation gateways, industrial HMI panels, medical monitoring devices, automotive accessory clusters, and USB-connected data loggers. The integrated USB and LCD reduce the external component count significantly.
When designing with this device, place a 0.1 uF decoupling capacitor close to every VDD pin and follow the recommended PCB layout for the USB DP/DM traces (90-ohm differential, length-matched). For OTA updates, leave a dedicated bank of Flash untouched for a fail-safe bootloader and verify the dual-partition handshake sequence from the manufacturer application note.
This page synthesizes distributor pricing, drop-in alternative MCU part numbers, and practical design notes not found in the manufacturer datasheet alone, helping procurement and firmware teams evaluate second-source options and field-update strategies.
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