P-Star 25K50 Micro

Overview

The Pololu P-Star 25K50 Micro is a general-purpose programmable module based on Microchip’s PIC18F25K50 microcontroller, which has 32 KB of flash program memory, 2 KB of RAM, and built-in USB functionality. On-board features of the P-Star (abbreviated P*) include a 16 MHz crystal, a USB Micro-B connector, and three user-controllable indicator LEDs. A voltage regulator and power selection circuit allow the board to be powered from either USB or an external 5.5 V to 15 V source, while a resettable PTC fuse on the USB VBUS supply and reverse protection on VIN help protect it from accidental damage. The board ships with a USB bootloader that makes it easy to program the PIC microcontroller without using an external programmer.

Our comprehensive user’s guide provides the basics you need to get started with the P-Star 25K50 Micro as well as detailed technical information.

This product requires a USB A to Micro-B cable (not included) to connect to a computer.

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

Features

• Dimensions: 1" x 0.6" (1.05" x 0.6" including USB Micro-B connector)

• Programmable Microchip PIC18F25K50 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

• 19 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

○ 14 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

• Can be powered from USB or external source regulated to 5 V by onboard regulator

• Operating voltage: 5.5 V to 15 V

○ Can operate down to 3.8 V with decreased logic voltage

• Reverse-voltage protection on external power input

• PTC fuse on VBUS supply

• Ships with a proprietary USB bootloader developed by Pololu for the P-Star

• Bootloader is usable from Windows, Linux, and Mac OS X with open source software

• No external programmer required

• Compatible with standard Microchip compilers, development tools, and programmers

• Comprehensive user’s guide

Pinout

P-Star 25K50 Micro pinout diagram.

This diagram identifies the I/O and power pins on the P-Star 25K50 Micro. The diagram is also available as a printable PDF (161k pdf). For more information about the PIC18F25K50 microcontroller and its peripherals, see Microchip’s PIC18F25K50 documentation.

Specifications

Dimensions

General specifications

Notes:

1 Without included optional headers. This measurement includes the USB Micro-B connector, which extends 0.05" past the edge of the PCB.
2 Without included optional headers.
3 8 KB of the MCU's 32 KB of flash memory is used by the pre-installed USB bootloader. All 32 KB is available if you use an external programmer and erase the bootloader.
4 All 19 can be used as digital I/O, 14 can be used as analog inputs, and one can be an analog output. 16 of the 19 are available along the sides for use in a breadboard.
5 On VIN.

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