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Pacificware, Inc.

Santa Clara, CA 95050


Phone:408-984-8060

Fax: 612-241-5375

 

Contact


recent additions

 

A reference design for a Next Generation USB variable power supply has just been released!

 

USB Variable Power Supply (Version 2)

 

We also recently released these designs:

 

USB UART Analyzer

 

USB Variable Power Supply

 

I2C Protocol Converter

 

USB Serial Port LED controller

 

downloads

 

At Pacificware, we're always considering applications we develop for general availability. Listed below are the most recently posted. The rest can be accessed on our Downloads page.

 

Computer Lockout for Kids

 

DismissNetworkPass

 

Serial Port Script

coming soon

 

Source files for these applications will be posted soon:

 

DismissNetworkPass

 

Periodic Power Monitor

USB Variable Power Supply

 

Occasionally we needed 2.8, 3.3 or 3.8 volts to power a little project while debugging firmware or hardware. Fortunately, lugging around a 15 pound BK precision DC regulated power supply forced us into a creative mood so we designed a variable mini power supply. It can supply several hundred milliamps via a USB cable from your laptop. If that isn't enough, just plug it into a USB wall adapter for more power.

 

Debug Board Iso

 

Our projects never use 5V anymore. These days, we usually require 2.8V, 3.3V or LiIon simulation from 3.6V to 4.2V. This little variable power supply covers them all.

 

USB Variable Power Supply Iso

 

A PIC16F677 is used to monitor the voltage with 100mV accuracy. Press the monitor button to monitor current with 10mA accuracy.

 

Debug Board Iso

 

The power supply is continuously adjustable from 1.7 to 4.6 volts using a simple pot. The low and high voltages are shown on the display below along with some of our most used voltages:

 

 

USB Variable Power Supply USB Variable Power Supply USB Variable Power Supply

 

USB Variable Power Supply USB Variable Power Supply

 

 

Documents:

 

*The Source schematic file includes:

 

 

 

 

 

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