Data Sheet

P-Star 25K50 with U.S. quarter for size

reference.

1. Overview

The Pololu P-Star 25K50 microcontroller board is a general-

purpose programmable module based on the PIC18F25K50

microcontroller from Microchip, which has 32 KB of flash

program memory, 2 KB of RAM and built-in full-speed USB

functionality. The P-Star 25K50 adds onboard components

and connectors that support the microcontroller and make it

easier to use. The board ships with a USB bootloader that

makes it easy to load new programs without using an external

programmer.

This product requires a USB A to Micro-B cable [https://www.pololu.com/product/2072] (not

included) to connect to a computer.

Features and specifications

• Dimensions: 1″ × 0.6″ (1.05″ × 0.6″ including USB Micro-B connector)

• Programmable Microchip PIC18F25K50 PIC microcontroller

◦ 32 KB flash (8 KB used by bootloader, leaving 24 KB available for user program by default)

◦ 2 KB SRAM

◦ 256 bytes of EEPROM

◦ Native full-speed USB (12 Mbps)

• 5 V logic voltage

• Internally clocked at 48 MHz, resulting in execution speeds up to 12 million instructions per second

(MIPS)

• Precision 16 MHz crystal

• Many I/O lines in a small package

◦ 16 user I/O lines along the sides of the board

◦ 3 additional I/O pins available in other locations

◦ 13 pins can be configured as analog inputs

◦ 2 PWM output signals (one of which can be sent to four different pins)

◦ 5-bit digital-to-analog converter (DAC) output

• Three user-controllable LEDs

• USB Micro-B connector

1. Overview Page 3 of 38