PIC16F15256-I/STX
PIC16F15256-I/STX - 8-Bit MCU, 28KB Flash, 32MHz, 28-VQFN | Microchip
The Microchip Technology PIC16F15256-I/STX is an 8-bit PIC16 microcontroller with 28KB Flash, 2KB RAM, and a 32MHz CPU core, housed in a 28-pin VQFN (4x4) package. The device integrates a 10-bit ADC, two PWM/CCP modules, an EUSART, SPI, I2C, and peripheral pin select (PPS), all engineered for cost-sensitive sensor and real-time control nodes.
An 8-bit microcontroller (MCU) is a small computer-on-a-chip that combines a CPU, non-volatile program memory, volatile data memory, and a curated set of digital and analog peripherals around a Harvard or modified-Harvard bus. Within the broader taxonomy, the PIC16F15256 belongs to the 8-bit MCU class -> PIC microcontrollers -> PIC16 family -> PIC16F152xx sub-family, and ultimately to the embedded processing semiconductor category that also includes 16-bit dsPIC, 32-bit ARM Cortex-M, and RISC-V microcontrollers. Its role in any system is to read sensors, run deterministic control loops, and drive actuators, displays, or communication busses.
Key features include up to 32MHz internal oscillator operation, 28KB self-programmable Flash with code protection, 2KB SRAM, an 18-channel 10-bit ADC, two 10-bit PWM outputs with two CCP modules, an EUSART (RS-232/RS-485), SPI and I2C with address masking, a hardware limit timer (HLT), windowed watchdog timer, and Microchip's eXtreme Low-Power (XLP) sleep modes drawing under 50 nA typical. The Peripheral Pin Select block remaps most digital peripherals to a wide choice of I/O pins, easing PCB layout.
Architecturally, the PIC16F15256 uses Microchip's enhanced mid-range 8-bit core with a hardware multiplier, single-cycle instruction fetch, and 256-byte EEPROM data memory. The on-chip voltage regulator supports operation from 1.8V to 5.5V across -40C to +85C industrial range. Built-in Core Independent Peripherals such as the CWG, NCO, and HLT allow complex waveform, frequency, and timing functions to execute without CPU intervention, freeing the core for application logic.
Typical applications include IoT sensor end nodes, battery-powered HVAC and thermostat controls, white-goods and small appliance controllers, low-cost BLDC fan and pump drivers, lighting controllers, and remote-control user-interface boards. The combination of small 4x4 mm VQFN footprint and rich analog/digital mix suits compact, cost-constrained designs.
Design consideration: when migrating from a 28-pin SPDIP/SOIC PIC16, the VQFN-28 (4x4) STX package requires a 0.4 mm pitch land pattern with an exposed thermal pad that MUST be soldered to the ground plane for thermal and electrical performance; skip this and the part may overheat or exhibit reset issues at full peripheral load.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
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