IT8728F Datasheet – Integrated Super I/O Controller
Environment Control – Low Pin Count Input / Output
IT8728F overview
The IT8728F is an Environment Control – Low Pin Count Input / Output, supplied in a QFP 128 Pin Type package. The absolute maximum ratings table on this page lists the 5 limits from the manufacturer's datasheet that must not be exceeded. This page brings together the IT8728F pinout and maximum ratings, with the full datasheet PDF to preview below or download.
The IT8728F 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 IT8728F is ACPI & LANDesk compliant.
The IT8728F features an enhanced hardware monitor providing three thermal inputs from remote thermal resistors, or thermal diode or diode-connected transistor (2N3904/2N3906). The device employs ITE’s innovative intelligent automatic Fan ON/OFF & speed control functions (SmartGuardian) to protect the system while reducing the system noise and power consumption. The Fan Speed Controller can control up to five fan speeds through five separate 256 steps of Pulse Width Modulation (PWM) output pins and monitor up to five FANs’ Tachometer inputs.
In addition, it features two 16C550 standard compatible enhanced UARTs performing asynchronous communication, one multi-mode high-performance parallel port supporting 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), 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 integrated Keyboard Controller, eight GPIO ports controlling up to 57 GPIO pins, which can be individually enabled or disabled via software configuration registers, and IR interface supported.
Regarding eco-design of Energy-using Product (EuP), IT8728F provides not only a solution to reducing power consumption in S5 State but also Keyboard, Mouse, RI# and CIR wakeup events in S3/S5 State. The IT8728F 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 +3.3V power supply. The IT8728F is available in 128-pin QFP (Quad Flat Package).
Datasheet
IT8728F features
- Low Pin Count Interface
- Complies with Intel Low Pin Count Interface Specification Rev. 1.1
- Supports LDRQ#, SERIRQ protocols
- Supports PCI PME# Interfaces
- ACPI & LANDesk Compliant
- ACPI V. 2.0 compliant
- Register sets compatible with “Plug and Play ISA Specification V. 1.0a”
- LANDesk 3.X compliant
- Supports 8 logical devices
- Enhanced Hardware Monitor
- Built-in 8-bit Analog to Digital Converter
- 3 thermal inputs from either remote thermal resistor or thermal diode or diode-connected transistor, the temperature sensor of the current mode
- 7 voltage monitor inputs (3VSB and VBAT measured internally)
- 1 chassis open detection input with low power Flip-Flop dual-powered by battery or 3VSB
- Watch Dog comparison of all monitored values
- SST/PECI/AMDTSI/PCH SM-Link I/F supporting external temperature reading for fan control
- Fan Speed Controller
- Provides fan on-off and PWM control
- Supports 5 programmable Pulse Width Modulation (PWM) outputs
- 256 steps of PWM mode
- Monitors 5 fan tachometer inputs
- Provides fan close-loop control
- Smart Guardian Controller
- Provides programmably automatic fan speed control
- Supports mix-and-match for temperature inputs and fan speed control outputs
- Overrides fan speed controller during catastrophic situations
- Provides audible over temperature warning
- Two 16C550 UARTs Supports two standard Serial Ports
- Supports two standard Serial Ports
- Consumer Remote Control (TV remote) IR with Power-up Feature Supports two CIR Ports
- Supports two CIR Ports
- IEEE 1284 Parallel Port
- Standard mode -- Bi-directional SPP compliant
- Enhanced mode -- EPP V. 1.7 and V. 1.9 compliant
- High-speed mode -- ECP, IEEE 1284 compliant
- Back-drive current reduction
- Printer power-on damage reduction
- Supports POST (Power-On Self Test) Data Port
- Floppy Disk Controller Supports two 360K/ 720K/ 1.2M/ 1.44M/ 2.88M floppy disk drives Enhanced digital data separator 3-Mode drives supported Supports automatic write protection via software Keyboard Controller
- Supports two 360K/ 720K/ 1.2M/ 1.44M/ 2.88M floppy disk drives Enhanced digital data separator
IT8728F pinout
| Pin | Name |
|---|---|
| 1 | 33 |
| 2 | 34 |
| 3 | 35 |
| 4 | 36 |
| 5 | 37 |
| 6 | 38 |
| 7 | 39 |
| 8 | 40 |
| 9 | 41 |
| 10 | 42 |
| 11 | 43 |
| 12 | 44 |
| 13 | 45 |
| 14 | 46 |
| 15 | 47 |
| 16 | 48 |
| 17 | 49 |
| 18 | 50 |
| 19 | 51 |
| 20 | 52 |
| 21 | 53 |
| 22 | 54 |
| 23 | 55 |
| 24 | 56 |
Show all 32 pins
| Pin | Name |
|---|---|
| 25 | 57 |
| 26 | 58 |
| 27 | 59 |
| 28 | 60 |
| 29 | 61 |
| 30 | 62 |
| 31 | 63 |
| 32 | 64 |
Absolute maximum ratings
| Parameter | Value |
|---|---|
| Applied Voltage | -0.3V to 3.6V |
| Input Voltage (Vi) | -0.3V to VCC3 + 0.3V |
| Output Voltage (Vo) | -0.3V to VCC3 + 0.3V |
| Operation Temperature (Topt) | 0°C to +70°C |
| Storage Temperature | -55°C to +125°C |
IT8728F applications
- PC Motherboard Monitoring
- Hardware Health Monitoring
- Fan Speed Control
- Temperature Sensor Interface
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