DS28E38Q+U

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Memory

The DS28E38Q+U is an integrated circuit featuring a 128-bit secret key non-volatile EEPROM that stores a system configuration, a key identification number, a cryptographic secret and an activity counter. Specifically designed to perform secure cryptographic operations such as verifying and digitally signing data, this IC makes a perfect companion to many microcontroller systems. It has a signed internal EEPROM providing mutual authentication and limitation of the end-users access.

Application Field

The open-drain I/O is an especially useful feature of the DS28E38Q+U, making it well-suited to use as an I²C slave IO port. This makes the device an ideal solution to the task of controlling embedded I²C peripherals securely. It is quite useful for connected products, from low-cost consumer goods to more expensive industrial components, such as automotive ECUs.

The EEPROM memory of the chip can be used for storing system configuration or an algorithm\'s key, such as a password, unlocking the device\'s functionality or authentication capability. This might be especially important for products like cars and HVAC systems, where unauthorized access is heavily discouraged.

Working Principle

The DS28E38Q+U operates on the 1-Wire protocol, featuring an integrated 1-Wire driver and a control logic that allows it to detect the communication speed automatically and perform the required operations. Also, its I/O can be used for bidirectional signaling between ICs, enabling communication for updates, transmission of data and secured commands.

When performing update operations, data can be read from the EEPROM of the device. Also, the counter can be used to store the number of times a command is used. Additionally, the secret key stored in the device is used for mutual authentication between the host and the device, as well as to validate the data being used. In this way, it provides secure communication between the host and the device.

In summary, the DS28E38Q+U is perfect to use as a secure IP controller with 128-bit effective user space to store a system configuration, key identification number, cryptographic secret and activity counter, providing mutual authentication and secure communication.

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