PIC TQFP-100 Breakout Board design overview
From DP
The PIC TQFP-100 Breakout Boards support PIC32s, PIC24s, and dsPIC33 devices that come in the TQFP-100 (0.4mm pitch) PT packages. They have all the support circuitry you'll need for the microcontroller, allowing you to concentrate on the rest of your project. It features:
- USB and external 3.3V regulated power-supply
- External only 5V regulated supply for USB Host projects
- Host enabled USB connector
- X MHz primary crystal
- 32.768 KHz secondary crystal for Real Time Clock projects
- One power, and two user programmable LEDs
- Reset button
- Programing ICSP header
- All the port pins broken out into two dual row headers
Prototype PCBs are available in the free PCB drawer.
Contents |
Overview
History and related links
Hardware
Click for a full size schematic image. Schematic and PCB were designed with the freeware version of Cadsoft Eagle, download the latest project files from our Google Code project page.
Microcontroller section
- Microcontroller
- Power and decoupling
- Oscillator
- Programming and reset support
- LEDs
Host and deice USB
Broken out Pins
PCB
We used the freeware version of Cadsoft Eagle to make the schematic and PCB. Download the latest designs and firmware from the project Google Code page.
- PCB and placement notes
- soldering advise
Partslist
Click for a full size placement image.
| heading | heading |
|---|---|
| cell | cell |
| cell | cell |
Firmware
The firmware is written in C and compiled with the free Microchip C18 compiler. You can download the latest files from our Google Code project page.
- Operating modes
- extra software required
We used the Microchip USB stack to run the 18F2550 as a virtual serial port. Microchip's code is open but not redistributable. If you want to compile the source, download the stack from Microchip, then drag the source code into the install directory. See the detailed instructions in the PIC compiler how-to.
.inf installation
The virtual serial port (CDC) is an open standard, it should work on any modern operating system.
You don't need a driver, but you will need a .inf file to tell Windows how to use the device. A suitable .inf is included in the project archive.
Commands
Bootloader
Source and license
Taking it further
Here's some ideas for the future:
- List
We'll post the most recent firmware updates on our blog. You can also join the discussion in the [forum].
Get one!
You can [get one for $00], including worldwide shipping.
Your purchases at Seeed Studio keep the open source project coming, we sincerely appreciate your support!