The IT8783F is a highly integrated Super I/O using the Low Pin Count Interface. It provides the most commonly used legacy Super I/O functionality plus the latest Environment Control initiatives, including H/W Monitor and Fan Speed Controller. The device’s LPC interface complies with Intel “LPC Interface Specification Rev. 1.1”. The IT8783F is ACPI & LANDesk compliant.
The IT8783F features an enhanced hardware monitor providing three thermal inputs from remote thermal resistors, or thermal diode or diode-connected transistor (2N3904).
The IT8783F contains one Fan Speed Controller, which can control up to three fan speeds through three separate 128 steps of Pulse Width Modulation (PWM) output pins and monitor up to three FANs’ Tachometer inputs. It also features six 16C550 UARTs, one IEEE 1284 Parallel Port, one Floppy Disk Controller and one Keyboard Controller.
Integrated in the IT8783F are 12 logical devices, which can be individually enabled or disabled via software configuration registers, one high-performance 2.88MB floppy disk controller, with digital data separator, supporting two drives in 360K/ 720K/ 1.2M/ 1.44M/ 2.88M format, one multi-mode high-performance parallel port supporting the bi-directional Standard Parallel Port (SPP), Enhanced Parallel Port (EPP V. 1.7 and EPP V. 1.9), and IEEE 1284 compliant Extended Capabilities Port (ECP), six 16C550 standard compatible enhanced UARTs performing asynchronous communication, and supporting an IR interface. The device also features one fan speed controller controlling three and monitoring three fans, six GPIO ports controlling up to 40 GPIO pins, and one integrated Keyboard Controller.
The IT8783F utilizes power-saving circuitry to reduce power consumption, and once a logical device is disabled the inputs are inhibited with the clock disabled and the outputs are tri-stated. The device requires a single 24/48 MHz clock input and operates with +5V/3.3V power supply. The IT8783F is available in 128-pin QFP (Quad Flat Package).