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Super I/O with Temperature Sensing, Quiet Auto Fan and Glue Logic with PECI
SMSC SCH5027E 3 Revision 0.2 (02-11-09)
PRODUCT PREVIEW
General Description
The SCH5027E is a 3.3V (Super I/O Block is 5V tolerant) PC99/PC2001 compliant Super I/O controller
with an LPC interface. SCH5027E also includes Hardware Monitoring capabilities, enhanced Security
features, Power Control logic and Motherboard Glue logic.
The SCH5027E'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, two at 1.125V,
one at 5V and one at 2.25V for Vccp (core processor voltage). There is also internal monitoring of the
SIO's VCC, VTR, and Vbat power supplies. The SCH5027E is capable of monitoring two external
diodes, one internal ambient temperature sensor or retrieving temperatures from external processors
that implement the PECI interface. The PECI implementation in the SCH5027E includes support for
the PECI REQUEST# and PECI AVAILABLE signals that are used to wake processors from the
C3/C4sleep states. There are three pulse width modulation (PWM) outputs with high frequency
support that may be controlled by the auto fan block, as well as four fan tachometer inputs. There are
two additional software controlled PWM inputs with associated tachometer inputs that may be used to
monitor fans. The nHWM_INT pin is implemented to indicate out-of-limit temperature, voltage, and
FANTACH conditions. The hardware monitoring block of the SCH5027E 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 SCH5027E also allows for a two or three piece linear fan function.
The Motherboard Glue logic includes various power management and system logic including
generation of nRSMRST, SMBus buffers, and buffered PCI reset outputs.
The SCH5027E 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
SMSC'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 SMSC's proprietary 82077AA core. System related functionality, which offers flexibility
to the system designer, General Purpose I/O control functions, control of two LED's, and fan control
using fan tachometer inputs and pulse width modulator (PWM) outputs.
The SCH5027E is ACPI 1.0/2.0 compatible and therefore supports multiple low power-down modes. It
incorporates sophisticated power control circuitry (PCC), which includes support for keyboard and
mouse wake-up events.
The SCH5027E supports the ISA Plug-and-Play Standard register set (Version 1.0a). The I/O Address,
DMA Channel and hardware IRQ of each logical device in the SCH5027E may be reprogrammed
through the internal configuration registers. There are up to 480 (960 - Parallel Port) I/O address
location options, a Serialized IRQ interface, and Three DMA channels.