Microcontroller simplifies and secures contactless payment terminals

Security features and payment interfaces are combined in the MAX32560 DeepCover secure microcontroller, to meet latest PCI-PTS standards and reduce development time.

According to Maxim Integrated, manufacturers of mPOS (point of sale) terminals, ATM (automatic teller machine) keyboards, EMV (Europay, Mastercard, Visa payment schemes) card readers, contact/contactless pin pads, and other mobile payment devices can save PCB space and reduce the bill of materials.

Functions for memory expansion, contactless interface and amplifier, ISO7816 PHY, magnetic stripe interface, and battery switch functions, currently using multiple external ICs, are integrated in the single MAX32560 DeepCover secure ARM Cortex-M3 microcontroller. As well as simplifying the design, and saving board space, this eliminates up to six external chips, says the company.

The MAX32560 embeds all the security features required to address stringent PCI-PTS (Payment Card Industry – PIN Transaction Security) requirements, including active tamper protection, scrambling keypad for PIN (personal identification number) handling, and a secure cryptographic engine. It integrates a number of analogue interfaces to reduce the PCB footprint, including a full EMV contactless reader interface, two EMV smart card interfaces, a DSP-based high performance magnetic stripe reader, two-channel ADC, and a DAC.

The MAX32560 offers 1Myte of embedded flash memory, 384kbyte of SRAM, and 8kbyte of secure NVSRAM. The memory can be expanded further with external fast serial flash memories via a flexible QuadSPI controller with XiP. It can quickly read and decrypt code or data using an on-the-fly AES engine. For communication interfaces, the MAX32560 provides a USB device port, three SPI controllers, two UARTs, and two I²C controllers.

It is available in a 9.0 x 9.0mm BGA144 package and operates across the -40 to +85 degree C range.

The MAX3260-KIT, evaluation kit is also available.



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