GenevaSTMicroelectronics has introduced the Xpander Logic family to help customers overcome the limited number of I/O ports in microcontroller and microprocessor-based embedded systems.
Any existing or additional I/O-intensive tasks on the central processing unit (CPU) can be now reassigned to the Xpander Logic IC that operates off ultra-low power and comes in a very small package, making it suitable for portable multimedia devices such as mobile phones, smartphones, and personal digital assistants.
The Xpander Logic family allows the existing system processor to use a wide range of intelligent functions through a standard and high-speed Inter-Integrated Circuit (I2C) serial peripheral interface. These intelligent features include a keypad controller, supporting 96 keys maximum, and a Pulse-Width Modulation (PWM) controller, able to adjust the brightness of the LEDs in addition to performing sophisticated brightness patterns.
The Xpander Logic family also offers a 3-wire rotating-wheel controller which supports the increasingly popular rotating wheel interface in portable electronics by detecting the motion of the wheel and providing monitoring/buffering features.
The family also integrates an A/D converter and a D/A converter, allowing the host system to implement a wide range of mixed-signal features while providing an automatic dimming unit that lets the ambient light sensor control a backlight unit without CPU intervention.
All the features are achieved through a minimum change on the existing microprocessor or microcontroller firmware. As a result, the family is a very flexible and cost-competitive product to expand system resources if compared to the complex implementation of larger and more expensive CPU or programmable logic devices in the embedded system.
A further benefit of the Xpander Logic family for users is the high optimization for micro-power operation and the advanced power-management support that helps modern portable systems preserve and extend battery life.
The Xpander Logic STMPE2401 provides all the above-mentioned intelligent functions in a microTFBGA36 package, while the STMPE801 performs the basic I/O expander function in a QFN16 package.
Pricing: The STMPE2401 and STMPE801 cost $1.5 and $0.80, respectively, in 100,000 unit quantities.
Availability: In production now, the devices are housed in very small packages (QFN16, microTFBGA25 and microTFBGA36).
Data Sheets: click here and click here.
STMicroelectronics, (781) 861 2650, www.st.com