Analog Devices Introduces Adaptive Lighting Management System For Portable Electronics
Analog Devices, Inc. released its ADP5520 lighting management system – described as a power-efficient, customizable display management solution designed to improve viewing quality and extend battery life in mobile phones, personal navigation devices and media players.
The single-chip ADP5520 lighting management system is said to enable a 20% reduction in battery power consumption through the use of an "intelligent" lighting-control that automatically detects ambient light levels and adjusts backlight brightness according to changing lighting environments. An adaptive ambient light management feature adjusts too-bright or washed-out screens autonomously according to configurable lighting profiles. This reduces current-drain and extends battery life by minimizing the processor involvement in backlight monitoring. In addition, the ADP5520 can assume control of key-scan and general-purpose I/O sub-system functions from the processor, further reducing system power consumption and increasing available processor bandwidth.
Using this highly integrated lighting management system, designers of "flip" or slider form factor phones can reduce the number of control lines running across the hinge of a phone from 53 lines down to 14. The company claims that this brings significant cost and reliability benefits to flip phones or slider phones in which the backlighting system is located alongside the LCD display. In a typical mobile handset application, the ADP5520 integrates the keypad controls, lighting sensor, LED indicators, and backlight LED supply on a single chip, and also features programmable profiles with minimum software overhead to control LED backlight intensity, on/off timing, fade algorithm cubic (or square law), and dimming timers.
The ADP5520 lighting management system is available now in sample quantities. The device is housed in a 24-pin LFCSP (lead-frame chip-scale package) and operates with a 2.7 to 5.5V supply voltage and a 1.8 to 3.3V I/O supply. The ADP5520 is priced at $1.66 per unit in 1,000-unit quantities.
