I/O Controller 128-Pin QFP

The DME1737 is a 3.3V (Super I/O Block is 5V tolerant) PC99/PC2001 compliant Super I/O controller with an LPC interface. DME1737 also includes Hardware Monitoring capabilities, enhanced Security features, Power Control logic and Motherboard Glue logic. The DME1737"s hardware monitoring capability includes temperature, voltage and fan speed monitoring. It has the ability to alert the system to out-of-limit conditions and automatically control the speeds of multiple fans. There are four analog inputs for monitoring external voltages of +5V, +5VTR, +12V and Vccp (core processor voltage), as well as internal monitoring of the SIO"s VCC, VTR, and Vbat power supplies. The DME1737 includes support for monitoring two external temperatures via thermal diode inputs and an internal sensor for measuring ambient temperature. The nHWM_INT pin is implemented to indicate out-of-limit temperature, voltage, and FANTACH conditions. The hardware monitoring block of the DME1737 is accessible via the System Management Bus (SMBus). The same interrupt event reported on the nHWM_INT pin also creates PME wakeup events and speaker alarm annunciation. The Motherboard Glue logic includes various power management and system logic including generation of nRSMRST, SMBus buffers, and buffered PCI reset outputs. The DME1737 incorporates complete legacy Super I/O functionality including an 8042 based keyboard and mouse controller, an IEEE 1284, EPP, and ECP compatible parallel port, one serial port that is 16C550A UART compatible, one IrDA 1.0 infrared ports, and a floppy disk controller with Microchip"s true CMOS 765B core and enhanced digital data separator. The true CMOS 765B core provides 100% compatibility with IBM PC/XT and PC/AT architectures and is software and register compatible with Microchip"s proprietary 82077AA core. System related functionality, which offers flexibility to the system designer includes, General Purpose I/O control functions, control of two LED"s, and fan control using fan tachometer inputs and pulse width modulator (PWM) outputs. 3.3 Volt Operation (SIO Block is 5 Volt Tolerant) LPC Interface Programmable Wake-up Event Interface PC99, PC2001 Compliant ACPI 2.0 Compliant Multiplexed Command, Address and Data Bus Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems PME Interface ISA Plug-and-Play Compatible Register Set 25 General Purpose Input/Output Pins System Management Interrupt AC Power Failure Recovery Watchdog Timer 2.88MB Super I/O Floppy Disk Controller Enhanced Digital Data Separator Serial Ports Motherboard GLUE Logic