I2CChip.com: I2C, SPI, 1Wire Interfacing Made Easy

Thousands of low-cost integrated circuits use serial buses: I2CChip talks to them all from your PC

8 Bit I/O Ports PCF8574

Connectors and Bus Pinouts (for common I2C Buses)
Slave IC's
EV Kits for I2C IC Manufacturers
Automating Test Equipment
Simple Relay Control & I/O
Make a 24 Channel temperature logger

I2C Info

News for Datasheet Updates, Application notes, and New Products
Starter Kit has everything you need to get going with I2C in 5 mins.
Training Videos to help use and understand our products.
12 Bit Precision ADC module using MAX127 available.
Locking I2C connectors for high vibration environments in stock
Application note BL233 Data Formatting (for Data Acquisition and Logging)
Application note Using I2C2PC and BL233 with Low Voltage I2C
Application note ADM1034 Precision External Temperature Sensor
Application note Using I2C2PC and BL233 for SPI
Bi-Color Red/Green 0.56" Led display modules
Application note on Bluetooth for I2C2PC adaptor
8 Bit I/O
BL233 Enhanced: adds Dallas 1Wire, fast I2C, better SPI, improved I/O

I2C-2-PC USB/RS232 Adaptor using BL233 $69.95

Both USB and RS232 interfaces. USB for speed. RS232 for distance!
3 Separate I2C Buses
I2C, SPI & Dallas 1-Wire interfaces
Simple ASCII protocol is easy to use with any OS, and any programming language.
Fully self contained, includes on board 5V and 3.3V power supply OR USB powered
Galvanic Isolation for safety - protect your PC from damage
Simple stand-alone functions, power on initialisation of I2C devices without PC present
Watchdog function without PC
Better and more economical than competitors products
Use as a simple parallel I/O port without any serial bus devices e.g. drive relays.
Use I2C-2-PC for development. Redesign with BL233 for low cost later.
Compact in an attractive enclosure: not a bare-board
New Application note on Bluetooth for I2C2PC adaptor
Application note Optic Fibre Interface for I2C2PC adaptor

I2C Starter Kit $89.95

I2C Starter Kit is the fast, easy way to get up to speed with I2C and the I2C2PC adaptor.

I2C2PC Adaptor
8 Bit I/O port with LED's
I2C Cables & Connectors
USB Cable
Zip Pouch for storage
Training Videos

BL233I2C to Serial Interface IC,

DIP18, 10pieces

Just the Bare IC to build into your own OEM products. At $3.95 in small quantities, and less in volume, you can build profitable volume products around the BL233.

3 Serial Buses
5V and 3V compatible buses
All serial buses: I2C, SPI, 1-Wire
Works as simple 8 bit I/O port: Drive LED's and relays directly
Store POWER-ON, WATCHDOG-TIMEOUT and INTERRUPT macros internally: Runs even when the PC doesn't.
Works with all Win,Linux, PDA's, Calculators.
Simple ASCII commands: No API's, No DLL's needed. No hidden software costs.

I2C Bus Connectors and Cables

Free Postage for I2C Bus connector and cable orders

All our products use the small reliable Micro-match 6 pin connector. For your convenience we have connectors and built up cables available.

Connector and Bus Pinout Learn about our pinout, and those of lots of others.
Information about Crosstalk, Pullups, Bus Length, Cable Types

Even if you don't use our adaptors, you can use our well thought out pinout and, compact connector for I2C and SPI bus devices.

Free Software: Talk I2C out-of-the-box

Our free Realterm software talks directly to the I2C-2-PC / BL233. You can just talk write and read directly from any new serial bus IC with no programming at all.

Sip Modules: SIP modules as small, simple pcbs with a single row of I/O pins along one edge, and our standard I2C connector. The only pins you need to wire up, are the I/O pins you are using. Everything else is done for you. Because the pins are 0.1" spaced, they are easy to put on proto-boards of all kinds. You can even put standard 0.1" plugs on them.

Modules:

8 bit I/O port with PCF8574
8 Push buttons + 8 LED's using PCF8574
12 Bit +/- 10V Precision ADC with Current Sensor
8 Bit ADC, DAC
6 Digit Event Counter
4 Way Bus switch for bus expansion
Bus Monitor Board
4 digit Numeric Displays Numeric displays are unbeatable for readability! LED and LCD, 0.3", 0.56", 0.8", 1.0", 2.3", 4.0"
82C96 Bus Extender and Galvanic Isolator
82B715 Bus Extender
Constant Current Pullup module
Adaptor Board for different connectors
Alphanumeric LCD Adaptor: A simple interface to standard LCD modules
I

Specialist I2C Slave IC's

BL301 Versatile Display Driver: Drives a mixture of Alpha LCD's, LED and LCD modules, and does binary-> text conversions for you
BLRS232 Interface: Send RS232 from I2C. Ideal for emitting diagnostic messages to a PC
BL310 Latching Relay Driver: Latching relays offer many advantages, IF you have an easy way to drive them
Shaft Encoder IC: Counts pulse from quadrature encoders, both fast positions sensors, and cheap potentiometer types

Non I2C IC's

Bargraph IC's
BL310 Latching Relay Driver: Latching relays use almost no power, and are easier to use than normal relays with this driver
Hours Run Meter with IR output.
Waterproof switch IC
Power Switch:

Links: Info and Other I2C Chips and Devices

Mail any good links to us:

General I2C Bus Info

Other Built-up I2C Bus Modules

Matrix Orbital: Graphic and Character LCD Displays with I2C ports
Telecom I2C Controller for Power Supplies (up to 48V) and Electronic Loads for testing
Pond Electronics: PIC 16F876 based SBC, Prototype Bd, LCD Bd, RC-Servo Controller
Ademco: VideoBlox Expanders use I2C bus for keyboard, and I/O for alarm systems

Other Slave IC's

PCF8574 8 Bit Open Drain I/O port
JLC1562 8 Bit Open Drain I/O port with 6 bit DAC
PCF8591 4x 8bit ADC, 1x 8bit DAC
ADT7516 4x10bit ADC; 4x12bit DAC; VRef; Temp Sensor www.analog.com
20 Channel RC servo controller www.robot-electronics.co.uk
Philips I2C IC list
Ricoh RTC Chips 5 Types. Periodic waveform w/ no CPU operation. 3ppm trimming register

Other 2-wire devices that are NOT I2C

Sensiron: Humidity and other sensors. 2 wire sensor are NOT i2c, and not addressable. I2C2PC and BL233 can read them See How.
TI: 24 sigma-delta a-d convertor
STM,National: M5451/2/3 4 digit Display drivers. See our boards and driver dll

Other

Sanpeople: Ethernet to Serial Adaptors

Other Host Adaptor Manufacturers

These companies also manufacture host adaptors

MCC RS232 only Adaptors, Protocol analysers, I2C Boards Compare
Triangle Micro DB25 RS232 Adaptor Compare
Calibre PCI and ISA Host adaptors for Windows Compare

FDI's Philips style bit-bash parrallel port adaptor

Bit Bash Serial and Parallel Adaptors: There are many described on the web. We don't include these because of the numerous limitations of this approach.
A bit bash adaptor, but with drivers for windows only: http://www.demoboard.com/i2cprod.htm

Other Protocol Monitor

Our Bus Monitor board is an interface to Andy Greens Warmcat software, and comes with it on disk.

I2CChip.com: I2C, SPI, 1Wire Interfacing Made Easy

Host Adaptor Products:

I2C-2-PC USB/RS232 Adaptor using BL233 $69.95

I2C Starter Kit $89.95

BL233I2C to Serial Interface IC,