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IT8712F V0.81
3
General Description
2. General Description
The IT8712F is a Low Pin Count Interface-based highly integrated Super I/O. The IT8712F provides the most
commonly used legacy Super I/O functionality plus the latest Environment Control initiatives, such as H/W
Monitor, Fan Speed Controller, ITE’s “SmartGuardian” function and Smart Card Reader Interface. The
device’s LPC interface complies with Intel “LPC Interface Specification Rev. 1.0”. The IT8712F is ACPI &
LANDesk compliant.
The IT8712F features the enhanced hardware monitor providing 3 thermal inputs from remote thermal
resistors, or thermal diode or diode-connected transistor (2N3094). The device also provides the ITE
innovative intelligent automatic Fan ON/OFF & speed control functions (SmartGuardian) to protect the system,
reducing the system noise and power consumption. It also features a PC/SC and ISO 7816 compliant Smart
Card Reader.
The IT8712F contains one game port which supports 2 joysticks, 1 MIDI port, and 1 Fan Speed Controller.
The fan speed controller is responsible to control 5 fan speeds through three 128 steps of Pulse Width
Modulation (PWM) output pins and to monitor five FANs’ Tachometer inputs. It also features two 16C550
UARTs, one IEEE 1284 Parallel Port, one Floppy Disk Controller and one 8042 Keyboard Controller.
The IT8712F has integrated 12 logical devices. One high-performance 2.88MB floppy disk controller, with
digital data separator, supports two 360K/ 720K/ 1.2M/ 1.44M/ 2.88M floppy disk drives. One multi-mode high-
performance parallel port features the bi-directional Standard Parallel Port (SPP), the Enhanced Parallel Port
(EPP V. 1.7 and EPP V. 1.9 are supported), and the IEEE 1284 compliant Extended Capabilities Port (ECP).
Two 16C550 standard compatible enhanced UARTs perform asynchronous communication, and also support
either IR or MIDI interfaces. One game port with built-in 558 quad timers and buffer chips supports direct
connection of 2 joysticks. The device also features one MPU-401 UART mode compatible MIDI port, one fan
speed controller responsible for controlling / monitoring 5 fans and 5 GPIO ports (38 GPIO pins). The IT8712F
also has an integrated 8042 compatible Keyboard Controller with 2KB of programmable ROM for customer
application.
These 12 logical devices can be individually enabled or disabled via software configuration registers. The
IT8712F utilizes power-saving circuitry to reduce power consumption, and once a logical device is disabled the
inputs are gated inhibit, the outputs are tri-state, and the input clock is disabled. The device requires a single
24/48 MHz clock input and operates with +5V power supply. The IT8712F is available in 128-pin QFP (Quad
Flat Package).
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