P-Star 25K50 Micro

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Pololu item #: 3150
Brand: Pololu
Status: Rationed (Active and Preferred) 
RoHS 3 compliant


The P-Star 25K50 Micro is a tiny programmable module featuring Microchip’s PIC18F25K50 microcontroller. It packs a Micro-USB interface and 19 digital input/output pins onto a board measuring only 1″ × 0.6″ and ships preloaded with a USB bootloader, so no external programmer is required.

Pictures

P-Star 25K50 Micro.

P-Star 25K50 Micro, top view.

P-Star 25K50 Micro, bottom view.

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

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

P-Star 25K50 Micro with included optional headers.

P-Star 25K50 Micro on a breadboard with a reset button (left) and a bootloader button (on-board).

The P-Star 25K50 Micro with a vertical 5-pin programming header installed.

P-Star 25K50 Micro pinout diagram.

P-Star 25K50 Micro (top) and P-Star 45K50 Mini SV (bottom).




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. 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 Micro, bottom view.

P-Star 25K50 Micro, top view.

Features

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.

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: 194
Minimum operating voltage: 5.5 V
Maximum operating voltage: 15 V
Logic voltage: 5 V
Reverse voltage protection?: Y5
External programmer required?: N

Identifying markings

PCB dev codes: pc01a

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.

Documentation and other information

File downloads

Recommended links

Frequently-asked questions

No FAQs available.

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