The DeepCover secure microcontroller (MAXQ1741) from Maxim is a low-power device that integrates an adaptive low-power triple-track magnetic stripe reader interface, an I²C interface, two SPI interfaces and one universal synchronous/asynchronous receiver-transmitter (USART) interface.
Security features include an AES encryption engine, a true hardware random-number generator, voltage-attack sensors and a self-destruct input pin. A single-cycle 16-bit RISC MAXQ CPU powers the device, providing a high level of security for the magnetic stripe reader by placing an ultra-secure microcontroller with high-speed hardware encryption inside the magnetic card reader head.
The device provides 16 KB of Flash memory and 1152 Bytes of fast-wipe non-volatile SRAM (NV SRAM) that clears its contents when a tamper is detected. The highest 128 Bytes of the NV SRAM can be used as data RAM or working RAM for the AES.
The fast-wipe feature ensures that any data in the 1152 Bytes of memory is destroyed before any application software can access it. Factory programming of a unique 64-bit serial number, and/or customer secret key(s), are available upon request.
The microcontroller runs within a wide 1,7 V to 3,6 V operating window. User-application firmware interfaces with the triple-track magnetic stripe interface. Reference software supports the reading of cards adhering to ISO 7811, ISO 7812 and ISO 7813. Source code to the reference software is available so applications can make adjustments for custom card formats.
An ultra-low-power stop mode enables only a minimum amount of circuitry to support detection of self-destruct events. When the main power supply is present and the microcontroller is in stop mode, the device has the option of exiting stop mode when stimulated by general-purpose port pins or the serial interfaces.
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