PC97551

The Winbond PC97551 is an embedded controller (EC) for mainstream notebook applications. PC97551 includes a highly optimized set of functions, which provide a hardware/firmware partition that enables the implementation of flexible solutions; and its high-performance CPU core enables EC functionality to be extended via the firmware.

The PC97551 incorporates National's CompactRISC^TM CR16B core (a high-performance 16-bit RISC processor), internal ROM and RAM memories, system support functions and a Bus Interface Unit (BIU) that directly interfaces with both external memory (such as flash) and I/O devices.

System support functions of PC97551 include: watchdog, PWM, timers, interrupt control, General-Purpose I/O (GPIO) with internal keyboard matrix scanning, PS/2^® Interface, SMBus^® interface, analog-to-digital (ADC) and digital-to-analog (DAC) converters for battery charging circuitry, system monitoring and analog controls.

The PC97551 interfaces with the host via an LPC interface that provides the host with access to the Keyboard and embedded controller interface channels and to the BIOS flash. Like other members of Winbond's Advanced I/O family, the PC97551 is PC01 and ACPI compliant.