F71882
1. General Description
The F71882 is the featured IO chip for PC system. Equipped with one IEEE 1284
parallel port, two UART ports, KBC, Serial Peripheral Interface (SPI), SIR and one FDC. The
F71882 integrated with hardware monitor, 9 sets of voltage sensor, 4 sets of creative
auto-controlling fans and 4 temperature sensor pins for the accurate dual current type temp.
measurement for CPU thermal diode or external transistors 2N3906.
The F71882 provides flexible features for multi-directional application. For instance,
supports 6/12 pins CPU VID controlling for VRM9.0/10.0/11* and CPU VID OTF (On The Fly),
provides 32 GPIO pins (multi-pin), IRQ sharing function also designed in UART feature for
particular usage and accurate current mode H/W monitor will be worth in measurement of
temperature, provides 3 modes fan speed control mechanism included Manual Mode/Speed
Mode/Temperature Mode for users’ selection Additionally, provides easy voltage sensor input
(VSI) function for sensing Vcore voltage, then output (VSO) the offset voltage for over/under
voltage change use.
Further, the F71882 supports an automatic/dynamic over-voltage function for application
of over-clocking or under-clocking. This function provides a pin by external trigger signal to
improve the CPU’s performance by voltage offset automatically when system is going to run
over-clocking or under-clocking. Due to achieve this action, suggest F75133S Loading Gauge
chip can be the part which detects system/CPU loading to decide when issues the
over-clocking/under-clocking signal for system executing. Briefly, user can gain more features
on motherboard by these two parts which improve performance and efficiency.
The F71882 also integrated SPI interface. The SPI interface is for BIOS usage including
bridge function and back up function. Others, the F71882 supports newest AMDSI and Intel
PECI/SST interfaces for temperature use. These features as above description will help you
more and improve product value. Finally, the F71882 is powered by 3.3V voltage, with the
LPC interface in the package of 128-PQFP.
2. Feature List
General Functions
¾ Comply with LPC Spec. 1.0
¾ Support DPM (Device Power Management), ACPI
¾ 6/12 VID pins for VRM9.0/10.0/11.0* and CPU VID OTF (On The Fly)
¾ Easy voltage sensor I/O (VSI/VSO) for Vcore change use.
¾ Support automatic and dynamic voltage change function
(2 Turbo pins Turbo1# and Turbo2# for VID usage)
¾ Provides one FDC, two UARTs, KBC and Parallel Port
-1-
May, 2008
V0.28P
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