Easy-to-Use USB to I2C Adapters

Configurable I2C Bus Frequency

You can connect adapter to any I2C device and adjust the frequency to reach the maximum throughput. The I2C bus frequency is configured with a single function call.

Optional pull-up resistors

I2C pull-up resistors are assembled on board, but can be easily disabled if your board already has pull-up resistors. The boards that support I2C bus Fast-mode Plus (Fm+) have additional set of pull-up resistors.

I2C bus voltage 1.2V-5V

The I2C bus voltage can be supplied either by DLN USB-I2C adapter, or by your hardware. The DLN adapters can supply either 3.3V or 5V. External voltage can be in the range from 2V to 5V. The voltage level translator for DLN-4 adapters allows interfacing the I2C bus with voltage level from 1.2V to 3.6V. The exact values depends on specific adapter (see comparison table).

USB bus powered. Provide up to 350 mA of power to your embedded project.

The DLN USB-I2C adapters are powered directly from USB. No external power supplies are required. The USB to I2C adapters can also supply power for your hardware. The amount depends on specific device (see comparison table).

Clock stretching synchronization

Some I2C slave devices require additional time to process the data. Clock stretching allows them to delay the transmission until they are ready.

I2C Multi-Master

DLN I2C to USB adapters can share the bus with another I2C master device. This is important for rapid testing and debugging of closed I2C system.

ID and serial numbers are accessible from software.

Need to interface separate I2C busses simultaneously? You can connect several USB to I2C adapters to the same PC and interface them from the same software. Every adapter is uniquely identified by serial number, assigned during the manufacturing. You can change the ID number from software to prepare similar fixtures with multiple adapters in each fixture.

Asynchronous and Event Driven I2C Slave interface

When you use the DLN-4S adapter as an I2C slave, it waits for I2C master device to start the transaction. You can preconfigure the I2C adapter to send events after transaction. Polling, that wastes computer resources and bus bandwidth, is not required.

Upgrades are free and can be easily applied.

We are constantly working to add new features to our USB-I2C adapters. The upgrade can be applied without disconnecting the USB-I2C adapter from PC. You can use our firmware update utility (open source) or integrate upgrade into your setup.

The USB to I2C adapters come with a set of easy to use software applications. For I2C interface we provide the following programs:

These applications are free and open source code. You can use them as a starting point for your own software development.

After installing our setup package you’ll get access to dozens open source demos in different programming languages, varying from the simplest to the most advanced.

If you need additional demo or instructions on how to interface DLN USB to I2C adapters from your favorite programming language just contact us. Our engineers and support team will be happy to assist you.

With just a few lines of code you can interface your I2C bus from computer.

#include "..\..\..\common\dln_generic.h"
#include "..\..\..\common\dln_i2c_master.h"
#pragma comment(lib, "..\\..\\..\\bin\\dln.lib")

void main()
{
  // Establish connection to the USB-I2C adapter
  HDLN device;
  DlnOpenUsbDevice(&device);

  // Configure and enable the I2C master interface
  DlnI2cMasterSetFrequency(device, 0, 100000, NULL);
  DlnI2cMasterEnable(device, 0, NULL);

  // Prepare output buffer
  uint8_t output[8], input[8];
  for (int i = 0; i < 8; i++) output[i] = i;

  // Write data to I2C slave device
  DlnI2cMasterWrite(device, 0, 0x50, 1, 0, 8, output);

  // Read data from I2C slave device
  DlnI2cMasterRead(device, 0, 0x50, 1, 0, 8, input);

  // Print input data
  for (int i = 0; i < 8; i++) printf("%02x ", input[i]);
}
            

Additional Interfaces

Test Drive is a unique program offered by Diolan to assist you in evaluating and selecting the best interface adapter for your task. You will have 45-days risk free experience.

If the adapter does not satisfy your requirements, you can either return it back or exchange it to another adapter. The difference in price will be refunded.