LC709006A屬于集成電路（IC）的I/O擴展器。由安森美半導體公司制造生產(chǎn)的LC709006AI/O 擴展器該系列器件可與微控制器、微處理器或類似器件結(jié)合使用，目的是增加可用于連接外設的信號連接數(shù)量。典型的工作概念涉及使用串行通信，只需主機設備上的幾根 I/O 線，即可讀/寫擴展器設備上的許多輸入/輸出引腳的狀態(tài)。該技術(shù)的通信速度不佳，但連通性較高，最適合快速響應不是很關鍵的應用，例如許多人機界面應用。

Overview

The LC709006A is a peripheral IC dedicated for expanding the capability of the microcontroller (MCU) I/O ports. It interfaces with the microcontroller through synchronous serial communication. Communication with the extended I/O ports is accomplished through 24-bit parallel I/O. The extended port features include the capabilities to specify the I/O direction on a bit basis, to specify the output type (CMOS or N-channel open drain), and to specify the I/O voltage level on a port basis according to the power level of the peripheral equipment. These features make allow the LC709004A to be used in a wide variety of applications.

特性 Features

? 4-/5-wire synchronous serial transmission and reception, and 24-bit parallel I/O

? Wide operating voltage range (2.0V to 6.0V)

? Multifunction I/O ports

- I/O direction specification: Bit units

- CMOS or Nch-OD output type specification: Bit units

- Output voltage adjustment: Port (8 bits) units

? Output current: 12mA max. (capable of driving a green LED directly)

? Data transmission and reception: Can control reception of input data and transmission of output data in parallel.

? Cascaded configuration: Ports can be expanded in units of 24 bits × n (n is the number of LSI chips).

? Packaging from: MFP36SDJ (375mil): lead-free type