SCH5617C
Desktop System Controller Hub with Advanced,
8051µC-Based Auto Fan Control
• Fan Tachometer or Lock Rotor Inputs (3)
- Programmable linear automatic fan control
based on temperature
Product Features
• ACPI 2.0 Compliant
• High Performance 8051
- Acoustic enhancement mode
- ProcHot pins modulate Tmin
- Fan PWM duty cycle is a function in linear
mode of multiple temperatures and ProcHot
signals
- PWM Ramp Rate Closed Loop Control
• Internal Ring Oscillator for VTR Powered Logic
• Low Battery Warning
- 2.5X average instruction execution speed
improvement over the entire instruction set;
i.e., typical 4-clock instruction cycle in high-
performance 8051 vs. 12-clock instruction
cycle in standard 8051.
- Faster clock speed: 32 MHz vs. 16 MHz in
standard 8051.
- Dual Data Pointers
• LED Control
- More Interrupts: Power-Fail, External Inter-
rupt 2, External Interrupt 3, etc.
- A set of External Memory/Mapped Control
Registers provide the 8051 core with the abil-
ity to directly control many functional blocks
of the SCH5617C.
- 384 Bytes of RAM as part of the 8051 core
- 4k Bytes Data RAM (869 bytes may be used
to patch ROM code)
• SMBus Isolation Logic
• Programmable Wake-up Event Interface
• PC2001 Compliant
• General Purpose Input/Output Pins (30 Host con-
trolled, 16 8051 controlled)
• 21 Dedicated Scratchpad registers
• ISA Plug-and-Play Compatible Register Set
• System Management Interrupt
• GLUE Logic
- Twelve Interrupt Sources
- Watch Dog Timer (WDT)
• Operating Temperature Range of 0oC to +70oC
- IDE Reset/Buffered PCI Reset Outputs
- Power OK Signal Generation
- Power Sequencing
- Power Supply Turn On Circuitry
- Resume Reset Signal Generation
- Hard Drive Front Panel LED
• 2.88MB Super I/O Floppy Disk Controller
- Licensed CMOS 765B Floppy Disk Controller
- Software and Register Compatible with
Microchip's Proprietary 82077AA Compatible
Core
• PECI Interface
- Supports PECI REQUEST# and PECI AVAIL-
ABLE signaling
• Temperature Monitor
- Monitoring of up to Two Remote Thermal
Diodes
- Supports temperature readings from -63oC
to +192oC
- Supports Two Floppy Drives
- Configurable Open Drain/Push-Pull Output
Drivers
- Supports Vertical Recording Format
- 16-Byte Data FIFO
–
–
Supports monitoring of discrete diodes (3904
type diodes)
Supports monitoring substrate diodes (45nm &
65nm processor diodes)
- 1/8th degree temperature resolution
- Internal Ambient Temperature Measurement
- Limit Comparison of all Monitored Values
• PROCHOT_IN# Pin
- Mapped into Temperature monitoring inter-
rupt generation logic
- May be used to adjust fan control limits
- May be configured to force fans on full
• PROCHOT_OUT Pin
- 100% IBM® Compatibility
- Detects All Overrun and Underrun Conditions
- Sophisticated Power Control Circuitry (PCC)
Including Multiple Powerdown Modes for
Reduced Power Consumption
- DMA Enable Logic
- Data Rate and Drive Control Registers
- 480 Addresses, Up to Eight IRQs, and Four
DMA Options
• Auto-Fan Control with ProcHot Features
- PWM (Pulse width Modulation) Outputs (3)
- Enhanced Digital Data Separator
–
Legacy PWM control dc fan outputs
–
2 Mbps, 1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps
• High Frequency PWM Options (15kHz up to
30kHz)
Data Rates
–
Programmable Pre compensation Modes
• 2 second delayed start-up for PWM outputs
2014 Microchip Technology Inc.
DS00001789A-page 1