LPT-to-I2C	LPT-to-I2C Pro	LPT-to-I2C SE Pro	USB-to-I2C Pro
Windows-based general purpose I2C application
Ability to write i2c eeproms on our hardware or target
Parallel-port I2C interface host adapter hardware
DLL for creating your own I2C applications
Enhanced user interface
General purpose SPI software
Ability to read and write to SPI eeproms using user-friendly software
Bus voltage: 0.9V to 5.5V
Dedicated General purpose output (does not use the I2C or SPI pins)
General purpose Schmitt Trigger Input
USB-based I2C interface host adapter hardware
400 kHz I2C *
Switchable 3.3V and 5V power outputs
4 Mb/s SPI
I2C Multi-master capable

* note I2C is only specified up to 400 kb/s but hardware is capable of 1Mb/s

LPT-to-I2C
LPT-to-I2C is a general purpose I2C interface tool that allows a user to communicate with any I2C device. LPT-to-I2C includes the I2C interface host adapter hardware and Windows based software which is compatible with Windows 95, 98, ME, NT, 2000, and XP.
The software has the capability to program i2c serial eeproms from 16 bytes (128 bit) to 512K bits (64K bytes). Three universal modes provide the flexibility to communicate with any i2c device.

LPT-to-I2C Professional
LPT-to-I2C Professional is a Windows PC-based I2C hardware and software tool including the full version of LPT-to-I2C for interfacing with I2C and SMBus hardware, and a DLL that can be used to create your own custom i2c applications. Examples using Visual C++, VC.Net, Visual Basic, VB.Net, Delphi, and C++ Builder are provided. The LPT-to-I2C host adapter with serial EEPROM is shipped with this product.

LPT-to-I2C SE Professional
LPT-to-I2C Professional SE is a low voltage Windows PC-based I2C hardware and software tool including the full version of LPT-to-I2C SE for interfacing with I2C and SMBus hardware, and a DLL that can be used to create your own custom i2c applications. Examples using Visual C++, Visual Basic, Delphi, and C++ Builder are provided. The DLL is our most flexible and complete product containing over 35 functions; from low-level functions (WriteBit() and ReadBit()) to complex functions (I2CWriteArrayDB()). The LPT-to-I2C SE host adapter with serial EEPROM is shipped with this product.

USB-to-I2C Professional
USB-to-I2C Professional is a general purpose I2C interface tool that allows a user to communicate with any I2C device. USB-to-I2C includes the USB-based host adapter hardware and Windows based software which is compatible with Windows 98SE, ME, 2000, and XP.
The software has the capability to program i2c serial eeproms from 16 bytes (128 bit) to 512K bits (64K bytes). Two universal modes provide the flexibility to communicate with any i2c device. In addition to the eeprom/ram/fram support, the USB-to-I2C application has built in support for 35 specific i2c devices (see description below) which is useful for debugging hardware containing these common devices.
The hardware is capable of transmitting up to 1 Mb/s (note the i2c spec limits the speed to 400 Kb/s) and SPI up to 4 Mb/s. There are 3.3V and 5V power outputs on the USB-to-I2C hardware allowing you to power low-power target systems.
A DLL is included that can be used to create your own custom i2c, SMBus, and SPI applications. Examples using Visual C++, Visual Basic, Delphi, and C++ Builder are provided.

LPT-to-I2C

LPT-to-I2C is a general purpose I2C tool that allows the user to communicate with almost any I2C device. LPT-to-I2C includes the I2C interface host adapter hardware and Windows-based software which is compatible with Windows 95, 98, ME, NT, 2000, and XP.

There's nothing to program. Just install the software, reboot your system, then start sending I2C messages. There are various 'universal' modes (non-device specific) which allow you to read and write to any device address. You also have the ability to create your own device with up to 256 registers with no programming. The data can be changed using standard Windows controls such as sliders and spinners. Even bit level manipulation of the data is possible.
In addition to general-purpose capabilities, the LPT-to-I2C software has the ability to program most I2C serial EEPROM from 128 bits (16 bytes) to 512 Kbits (64 Kbytes). The EEPROM can be programmed using the on-board 8-pin socket or it can be in the user's target system. Data can be in mem, hex, or bin format.
If you are looking for a tool which will allow you to begin communicating with I2C devices within a very short period of time, you should consider this product.

We have now released LPT-to-I2C version 3 with a brand new user interface and the ability to update the software via the web.

Download a demonstration copy of the software. Note that the demo version does not install the device drivers so it is not functional.

Click here to download the LPT-to-I2C User's Manual.

Click here for a comparison between this product and RS-232 based products.

LPT-to-I2C Professional

LPT-to-I2C Professional is a 32-bit Windows-based I2C interface tool including all the features of LPT-to-I2C and an I2C DLL that can be used by any development tool that can call a function using stdcall calling convention. Examples using Visual C++ 6, VC.NET, Visual Basic 6, VB.NET, Delphi, and C++ Builder are provided. The LPT-to-I2C i2c interface adapter, with serial EEPROM, is also shipped with this tool.

There is no need to know complicated Windows programming to use the dll. All functions are intuitive. For example, to send a byte of data to a device, you could use a function such as I2CWriteByte(0x40,0x00). This function would send a 0x00 data byte to address 0x40. Low level functions can also be used to do an equivalent I2CWriteByte transfer but gives you more control to add additional delays or other processing between the functions:
I2CStart();
I2CWrite(0x40);
I2CWrite(0x00);
I2CStop();

There are very few limitations how you use the functions. For example, you can send an I2CStart() followed by an I2CStop(), or I2CStart followed by another I2CStart. You are free to determine to sequence of the i2c transfer.
Using the example programs and your favorite development tool, you can begin developing your applications without having to know much about i2c.
Our i2c interface products are compatible with Windows 95, 98, ME, NT, 2000, and XP operating systems.

A User's Manual and sample applications are included to aid the user to quickly generate customized i2c applications. Low level functions (such as Start and Stop conditions) as well as higher level routines (such as reading or writing an array of data) are available in the DLL. For a complete discussion of these functions, download a copy of the LPT-to-I2C Professional User's Manual. The LPT-to-I2C Professional kit includes a single user license for LPT-to-I2C and LPT-to-I2C Professional.

The LPT-to-I2C i2c interface adapter hardware was designed specifically for the software; it includes two different I2C header configurations and an on-board socketed 256 byte I2C EEprom for easy EE programming as well as system functionality confirmation. The I2C interface host adapter can be self powered from the PC parallel port or by the user's target system. An LED indicates power and software communication to the adapter.
The host adapter allows you to write your application and test it by using the EEprom as a target device. For even better simulations of I2C devices, you can insert a PCF8570 static RAM (not included) into the socket. For most I2C devices, when you are done with the application, only the device address will need to be changed when moving from the EEprom or RAM to your actual target environment.

We have now released version 3 of this product. It includes a brand new user interface and new functions in the dll, to improve your productivity even more.

Click here for a comparison between this product and RS-232 based products.

LPT-to-I2C SE Professional

LPT-to-I2C SE Professional has features similar to LPT-to-I2C Professional but we have added the following enhancements:

The LPT-to-I2C SE I2C Interface adapter operates over an extended voltage range of 0.9V to 5.5V. We have also added one output and one input pin. These can be configured as general purpose input and output pins but we have also integrated the output to act as a trigger (Low, High, Pulse High, Pulse Low) within the LPT-to-I2C SE software and the dll. The triggers are ideal for debugging purposes since they can be inserted into an i2c message and can trigger a scope at a specific point in the message.

The LPT-to-I2C SE has features similar to the LPT-to-I2C software and has added the general purpose IO/trigger functions. Download a demonstration copy of the software. Note that the demo version does not install the device drivers so it is not functional. You can also download a copy of Software User's Manual to see how simple it is to begin generating i2c messages.

The LPT-to-I2C SE Pro dynamic link library has all the functionality of the DLL included with LPT-to-I2C Pro, but we have added the general purpose IO/trigger functionality, as well as new low-level functions allowing complete flexibility and control of the SDA and SCL pins. User's who need to test their devices/systems for all types of error conditions (for example, sending an incomplete byte) will find this tool extremely useful.
Download a copy of the DLL User's Manual.

**Special Sale - order 2 SE's for $199.00 enter coupon code "sepromo2" at check-out - this is $179 savings!!
If ordering 1 SE, enter coupon code "sepromo1" at checkout, this is a $60.00 savings!

USB-to-I2C Professional

USB-to-I2C Professional is a general purpose I2C and SPI interface tool that allows a user to communicate with any I2C or SPI device. USB-to-I2C includes the USB-based host adapter hardware and Windows based software that is compatible with Windows 98SE, ME, 2000, and XP.
The USB-to-I2C software has the capability to program I2C and SPI serial eeproms, ram, and fram from 16 bytes (128 bit) to 512K bits (64K bytes). Universal modes provide the flexibility to communicate with any i2c device.
The hardware is capable of transmitting I2C up to 1 Mb/s (note the i2c spec limits the speed to 400 Kb/s) and SPI up to 4Mb/s. There are 3.3V and 5V switchable power outputs on the USB-to-I2C hardware allowing you to supply low-power target systems.
USB-to-I2C Professional includes:
- the USB-to-I2C hardware
- 3 ft USB 2.0 cable
- USB DLL allowing you to create your own I2C and SPI applications
- DLL examples for Visual C++, Visual C++ .Net, Visual Basic, Visual Basic .Net, Delphi, and C++ Builder
- USB-to-SPI Windows application
- the USB-to-I2C Windows application with universal I2C support and a custom interface for the following popular I2C devices:

LM75A DIGITAL TEMPERATURE SENSOR AND THERMAL WATCHDOG
NE1617 AND NE1617A TEMPERATURE MONITORS
PCA8550 5-BIT I2C EEPROM DIP SWITCH
PCA9500 8-BIT I2C I/O PORT WITH INTERRUPT AND 2K EEPROM
PCA9501 8-BIT I2C I/O PORT WITH INTERRUPT AND 2K EEPROM
PCA9530 2-BIT I2C LED DIMMER
PCA9531 8-BIT I2C LED DIMMER
PCA9532 16-BIT I2C LED DIMMER
PCA9533 4-BIT I2C LED DIMMER
PCA9534 8-BIT I2C I/O EXPANDER WITH INTERRUPT
PCA9535 16-BIT I2C I/O EXPANDER WITH INTERRUPT
PCA9541 I2C MASTER SELECTOR
PCA9540B TWO CHANNEL I2C MULTIPLEXER
PCA9542A TWO CHANNEL I2C MULTIPLEXER WITH INTERRUPT LOGIC
PCA9543A TWO CHANNEL I2C SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9544A FOUR CHANNEL I2C MULTIPLEXER WITH INTERRUPT LOGIC
PCA9545A FOUR CHANNEL I2C SWITCH WITH INTERRUPT LOGIC AND RESET
PCA9546A FOUR CHANNEL I2C SWITCH WITH RESET
PCA9548 EIGHT CHANNEL I2C SWITCH WITH RESET
PCA9550 2-BIT I2C LED BLINKER
PCA9551 8-BIT I2C LED BLINKER
PCA9552 16-BIT I2C LED BLINKER
PCA9553 4-BIT I2C LED BLINKER
PCA9554 8-BIT I2C I/O EXPANDER WITH INTERRUPT
PCA9554A 8-BIT I2C I/O EXPANDER WITH INTERRUPT
PCA9555 16-BIT I2C I/O EXPANDER WITH INTERRUPT
PCA9556 8-BIT I2C I/O EXPANDER WITH RESET
PCA9557 8-BIT I2C I/O EXPANDER WITH RESET
PCA9559 5-BIT I2C EEPROM DIP SWITCH
PCA9560 DUAL 5-BIT MULTIPLEXED 1-BIT LATCHED I2C EEPROM DIP SWITCH
PCA9561 QUAD 6-BIT MULTIPLEXED I2C EEPROM DIP SWITCH
PCF8574 8-BIT I/O EXPANDER
PCF8574A 8-BIT I2C I/O EXPANDER
PCF8575 16-BIT I2CI/O EXPANDER
SAA1064 4-DIGIT I2C LED DRIVER

Click here to download the USB-to-I2C Software User's Manual

Click here to download the USB-to-I2C DLL User's Manual

Click here to download the USB-to-I2C Hardware User's Manual

Click here to download an evaluation version of the USB-to-I2C software