Mobile I/O Expander and QWERTY Keypad Controller Enables up to 50 Percent Longer Battery Life for Portable Electronics
Analog Devices, Inc. (ADI) introduces the ADP5588 mobile I/O expander and QWERTY keypad controller with ambient light sensing for smart portable devices that require a large keypad matrix and expanded I/O lines. The ADP5588 integrates keypad scanning, de-bouncing and interrupt generation, resulting in reduced processor I/Os and loading. The new mobile I/O expander also detects ambient-light conditions, information the processor can use to ensure efficient control of keypad backlighting, resulting in a significant reduction in overall power consumption that can extend battery life by 20% to 50%, depending on the usage model. The ADP5588 features intelligent lighting control, which allows the device to automatically sense ambient light levels and adjust backlight brightness according to changing lighting environments, resulting in the optimum viewing conditions for the user. The integrated architecture saves energy by minimizing the required CPU processing for backlight-monitoring functions, reducing current drain on the battery, and increasing available processor bandwidth.