DS28E05R+U

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The DS28E05 family offers an extended solution for authenticated communication between two parties, namely a host and a device. Using the single-wire protocol, it simplifies interface implementation between microcontrollers and reads/writes different kind of data. The family features ECDSA cryptographic authentication along with user data non-volatile memory, a GPIO port and an address line.

The DS28E05R+U device, specifically, comes with 32 bytes of user memory accessible through an onboard I2C bus. This memory can be used to store data like ID/numbers, text and encrypted data. The addresses are limited to 8-bits, allowing up to 256 bytes addressed. This device has 4 GPIO lines (2 of which can be used as interrupt lines) and is available in a SOT-23-6 package.

Applications of this device are found in automotive, industrial, banking and security fields. An example of the application of the DS28E05R+U is for secure biometrics for controlling remote accesses. Such applications require that the device will verify the data received through the I2C bus, validate the user and then allow access to the door. The DS28E05R+U can provide the required security through its authentication protocol and user memory.

The DS28E05R+U utilizes an Elliptic Curve Digital Signature Algorithm (ECDSA), which is known for its strong encryption and authentication. It is designed to operate between an I2C master (host) and several I2C slaves (devices). Once the communication has been set, the host will send commands to the device and the device will respond accordingly, as pre-programmed. To guarantee a secure communication, each device will identify itself using a unique 8-byte device ID and ECDSA signature that has been encoded into the device.

To communicate with the device using this protocol, the host needs to send a “reset” signal and then, the device will respond by sending a response code. After this, the host needs to send a “verify” signal, and the device will then use its ECDSA authentication to compare the verification signal with its internal information. If the information matches, then the device will send a “confirmation” signal to the host. After this, the transmission of data can take place.

The device can also be used to store user data such as IDs or system parameters, using this authentication method. The data will be stored in non-volatile memory and the host can send commands to read or write to the memory. The same authentication procedure will apply when writing to the device.

In conclusion, the DS28E05R+U from the DS28E05 family offers strong authentication and strong security, along with user memory, an extended GPIO port and an address line. The DS28E05R+U can be used for secure biometrics, in automotive, industrial, banking, and security fields. It is an ideal solution when secure communication between a host and a device is needed.

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