This datasheet provides detailed information on the SMSC LPC47M172, including product features, specifications, interfaces, and compatibility.
The LPC47M172 is a highly integrated I/O controller designed for motherboard glue logic. It provides a 3.3 V operation (6 V tolerant) LPC bus, ACPI 1.0b/2.0 compliance, and a rich set of peripheral interfaces including GPIO, fan‑tachometer inputs, power‑LED drivers, and voltage‑translation circuits.
The device includes two full‑function UARTs, a multiprotocol infrared port, and a versatile parallel port with EPP and ECP support. It is offered in a 128‑pin MQFP package (3.2 mm footprint) and contains 2 kB of program ROM and 256 B of data RAM for embedded firmware.
| Operating Voltage | 3.3 V (6 V tolerant) |
|---|---|
| LPC Interface | Multiplexed Command, Address and Data Bus; Serial IRQ Interface |
| ACPI Compliance | ACPI 1.0b/2.0 |
| GPIO Pins | 13 |
| Fan Tachometer Inputs | 2 |
| Power LEDs | Green and Yellow |
| 5 V Standby Reference Generation | Enabled |
| IDE Reset / Buffered PCI Reset Outputs | Provided |
| Voltage Translation for DDC to VGA Monitor | Provided |
| SMBus Isolation Circuitry | Included |
| Program ROM | 2 kB |
| Data RAM | 256 B |
| Serial Ports | 2 full‑function UARTs, 16‑byte FIFOs, 230 k/460 k baud |
| Infrared Interface | Multiprotocol, 32‑Byte FIFO, IrDA 1.0 compliant |
| Package | 128‑pin MQFP, 3.2 mm footprint |
It operates at 3.3 V and is tolerant up to 6 V.
The device provides 13 GPIO pins.
Yes, it complies with ACPI 1.0b and 2.0 specifications.
It includes two full‑function serial ports with a 16C550A‑compatible UART and 16‑byte FIFOs, supporting 230 k and 460 k baud rates.