LED power management with Atmel’s XMEGA E

An LED lighting power management system typically includes elements such as power conversion, constant current regulation and fault handling. Key design considerations? A high level of integration, small form factor, support for a wide range of standard lighting communication protocols, energy efficiency and the ability to operate in high temperatures.

avrxmegalighting

And that is why Atmel’s AVR XMEGA E supports multiple LED driver topologies, all while leaving CPU resources for additional application functionalities.

“The XMEGA E offers high integration and a small form factor, along with dual high-speed 40ns analog comparators for current regulation,” an Atmel engineering rep told Bits & Pieces.

“Multiple high speed 128MHz timers allow generation of fast PWM, while dual digital to analog converters provide peak current management. There is also an Asynchronous Event System for ultra-fast response and control loops, with a Custom Logic (XCL) block to eliminate the need for external logic components.”

On the energy efficiency side, the XMEGA E – qualified for high temperature at 105C and 125C – is equipped with rich analog peripheral features to run complex power control algorithms. In addition, Atmel’s XMEGA E boasts ultra low power consumption: 100uA/MHz in active mode and 100nA in RTC/RAM retention.

As noted above, Atmel offers support for multiple lighting communication protocols, with hardware DALI support via an XCL block in XMEGA E, as well as software support for DMX, LWmesh, and interface to PLC, ZigBee Light Link, ZigBee Home Automation and other wireless protocols.

In addition, engineers who use the XMEGA E in their LED power management systems have access to a free IDE with compiler along with Atmel software libraries containing production ready source code.

Interested in learning more about Atmel’s lighting solutions? Be sure to check out our official lighting page here.

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