The WM9715 is a highly integrated input / output device designed for mobile computing and communications. The device can connect directly to a 4-wire or 5-wire touchpanel, mono or stereo microphones, stereo headphones and a mono speaker, reducing total component count in the system. Additionally, phone input and output pins are provided for seamless integration with wireless communication devices. The WM9715 also offers up to four auxiliary ADC inputs for analog measurements such as temperature or light. To monitor the battery voltage in portable systems, the WM9715 has two uncommitted comparator inputs. All device functions are accessed and controlled through a single AC-Link interface compatible with the AC’97 standard (rev 2.2). Additionally, the WM9715 can generate interrupts to indicate pen down, pen up, availability of touchpanel data, low battery, and dead battery. The WM9715 operates at supply voltages from 1.8 to 3.6 Volts. Each section of the chip can be powered down under software control to save power. The device is available in a small leadless 7x7mm QFN package, ideal for use in hand-held portable systems.