MAXQ622 is a low power 16-bit RISC microcontroller able to operate with a supply voltage down to 1.7V, that include 128KB of program Flash memory, 6KB of SRAM data memory, 6KB of utility ROM and  several peripherals such as: USB 2.0, IR Carrier generator and Modulator, two 16- bit Timers, two SPI port, two USART, one I2C, programmable watchdog timer, nanopower ring oscillator and up to 56 GPIO. This device operates from DC to 12MHz executing almost all instructions in a single clock cycle, when active device operation is not required, an ultra low power stop mode can be invoked from software, resulting in quiescent current consumption on less than 300nA typical.

The optional memory-protection features separate code memory into three areas: system, user loader and user application. Code in system area can be kept confidential. Code in the user area can be prevented from reading and writing system code. The user loader can also be protected from user application code. Memory protection is implemented using privilege levels for code. The integrated USB controller is compliant with the USB 2.0 specifications. The CPU communicates to USB controller module through the SFR interface. The microcontroller is seen by a USB host as a peripheral characterized by EP1, EP2 and EP3 as BULK or INTERRUPT endpoints. For maximum flexibility the microcontroller can be powered by either the USB or VDD. When a USB connection is made to a valid VBUS power source, an internal voltage regulator generates a 3.3V supply voltage. When the internal voltage is at an adequate level, it automatically powers itself from the USB supply. This is especially beneficial in system where VDD supply is from a battery. Maxim and third-party suppliers provide a variety of development tools for this microcontroller including: Compilers, In circuit emulator, IDE and JTAG to serial converter for programming and debugging.

A partial list of development tool vendors can be found at: www.maxim-ic.com/MAXQ_tools.

Device is available in 64 pin LQFP package, tested in commercial temperature range. Typical applications include battery powered equipment and control system with USB interface.