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

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. Onboard 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 Micro, bottom view.

P-Star 25K50 Micro, top view.

Features

  • Dimensions: 1″ × 0.6″ (1.05″ × 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
  • 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
  • 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.

Included hardware

Two 1×10-pin breakaway 0.1″ male headers and one 1×6-pin breakaway 0.1″ male header are included with the P-Star 25K50 Micro. These header pins can be soldered in to use the board with perfboards, breadboards, or 0.1″ female connectors.

P-Star 25K50 Micro with included optional headers.

The P-Star 25K50 Micro with soldered headers and connected USB cable.


Specifications

Dimensions

Size: 0.6″ × 1.05″ × 0.18″1
Weight: 1.3 g2

General specifications

Processor: PIC18F25K50
RAM size: 2 Kbytes
Program memory size: 32 Kbytes3
Motor channels: 0
User I/O lines: 164
Minimum operating voltage: 5.5 V
Maximum operating voltage: 15 V
Logic voltage: 5 V
Reverse voltage protection?: Y5
External programmer required?: N

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 16 can be used as digital I/O, 13 can be used as analog inputs, and one can be an analog output. An extra 2 I/O lines are accessible from the ICSP header, and RA0 is accessible on the RA0-VB jumper.
5
On VIN.

Resources

Documentation and other information

Pololu P-Star 25K50 Micro User’s Guide (Printable PDF)

User’s manual for the Pololu P-Star 25K50 Micro programmable module.


File downloads

P-Star 25K50 Micro pinout diagram (161k pdf)
Printable pinout diagram of the P-Star 25K50 Micro.
P-Star 25K50 Micro schematic diagram (414k pdf)
Printable schematic of the P-Star 25K50 Micro.
P-Star 25K50 Micro dimension diagram (202k pdf)
Printable dimension diagram of the P-Star 25K50 Micro.
Pololu USB Bootloader Utility (p-load) for Windows (version 2.0.0) (2MB msi)
Pololu USB Bootloader Utility (p-load) for Mac OS X (version 2.0.1) (112k pkg)
This version of the utility software requires Mac OS X 10.11 or later. For older versions of Mac OS X, use p-load 1.0.0 (33k dmg) instead (which only supports the P-Star 25K50).
P-Star 25K50 Micro drill guide (34k dxf)
This DXF drawing shows the locations of all of the board’s holes.

(PL-3150)

SKU PL-3150
Brand Pololu

Be The First To Review This Product!

Help other Little Bird Company Pty Ltd users shop smarter by writing reviews for products you have purchased.

Write a product review


More From This Category