1. General Description
The F81801 which is the featured IO chip for new generational PC system is equipped
with two UART ports, KBC, Serial Peripheral Interface (SPI), and 80-Port. The F81801
integrated with hardware monitor, 2 sets of voltage sensor, 2 sets of creative auto-controlling
fans and 2 temperature sensor pins for the accurate dual current type temp. measurement
for CPU thermal diode or external transistors 2N3906.
The F81801 provides flexible features for multi-directional application. For instance,
provides 16 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 2 modes fan speed control mechanism included Manual Mode/Speed
Mode/Temperature Mode for users’ selection.
Additionally SPI interface is for BIOS usage including bridge function and back up
function (Supports up to 16M and provides Mapping selection), and the 80-Port is for
engineering and debuging usage. The F81801 supports newest AMD new interface TSI and
Intel PECI 1.1/SST interfaces for temperature reading. Finally, the F81801 is powered by
3.3V voltage, with the LPC interface in the package of 64-TQFP green package.
2. Feature List
General Functions
Comply with LPC Spec. 1.1
Support ACPI
Provides two UARTs,
Support KBC
H/W monitor functions
SPI interface for BIOS Bridge and backup use.
Support Mapping selection for BIOS backup function
80-Port interface from COM2
Support AMD TSI interface and Intel SST/PECI interface
PECI
16 GPIO Pins for flexible application
24/48 MHz clock input
Packaged in 64-TQFP green package and powered by 3.3VCC
UART
Two high-speed 16C550 compatible UART with 16-byte FIFOs
1
Sep, 2011
V0.17P
Fully programmable serial-interface characteristics
Baud rate up to 115.2K
Support IRQ sharing
Keyboard Controller
Compatibility with the 8042
Support PS/2 mouse
Support both interrupt and polling modes
Hardware Gate A20 and Hardware Keyboard Reset
Hardware Monitor Functions
2 dual current type (3℃) thermal inputs for CPU thermal diode
Temperature range -40
℃
~127
℃
2 sets voltage monitoring
High limit signal (PME#) for Vcore level
2 fan speed monitoring inputs
2 fan speed PWM/DC control outputs(support 3 wire and 4 wire fans)
Issue PME# and OVT# hardware signals output
Case intrusion detection circuit
WATCHDOG# comparison of all monitored values
Serial Peripheral Interface Compatible
Support SPI bridge function for BIOS use
Support Back Up BIOS function
Up to 16M bit Support
Mapping Selection function
80-Port Interface
Monitor 0x80 Port and output the value via signals defined for 7-segment display.
High nibble and low nibble are outputted interleaved at 1KHz frequency.
80-Port output by COM2 interface.
Integrate AMD TSI interface
Integrate Intel PECI 1.1 /SST interface
Package
64-TQFP green package
Noted: Patented TW207103 TW207104 TW220442 US6788131 B1 TWI235231 TW237183 TWI263778
2
Sep, 2011
V0.17P
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