SparkFun Analog/Digital MUX Breakout – CD74HC4067 16通道 數位/類比分線轉換模組

描述

SparkFun Analog/Digital MUX Breakout – CD74HC4067 16通道 數位/類比分線轉換模組

SparkFun Analog/Digital MUX Breakout 是非常方便的16通道模擬/數字多路復用器/解復用器 CD74HC4067 的分線板。該芯片就像一個旋轉開關 – 它將公共引腳（原理圖中的COM，電路板上的SIG）內部路由到16個通道引腳（CHANxx）之一。它可以同時處理數字和模擬信號（電壓不能高於VCC），並且連接在任何方向都可以工作。要控制它，請將4個數字輸出連接到芯片的地址選擇引腳（S0-S3），並將其發送到所需通道的二進制地址（詳細信息請參見數據表）。這使您可以使用5個引腳將多達16個傳感器連接到您的系統！

由於多路復用器/解復用器也可以與數字信號一起工作，因此可以使用它將TTL級串行數據傳輸到多個設備或從多個設備傳輸。例如，您可以使用它將16個器件的TX引腳連接到微控制器上的一個RX引腳。然後，您可以選擇這16個設備中的任何一個來收聽。如果您需要雙向通信，您可以添加第二塊電路板，以將您的微控制器的TX線路發送至16個設備的RX線路。通過使用多個電路板，您可以為I2C，SPI等創建類似的配置。

內部開關是雙向的，支持接地和VCC之間的電壓，具有低“導通”電阻和低“關斷”洩漏，並且為了防止串擾，執行“先斷後合”切換。該電路板還會發出芯片的“使能”引腳，該引腳在被驅動為高電平時將完全斷開公共引腳（所有開關均“關閉”）。

• 2V至6V操作
• “開”電阻：70歐姆@ 4.5V
• 6ns之前製造@ 4.5V
• 寬工作溫度範圍：-55℃至125℃

資源與下載

• 硬體概要
• Eagle 文件
• DataSheet 數據表
• bildr博客 – CD74HC4067
• GitHub上

SparkFun Analog/Digital MUX Breakout – CD74HC4067

This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. This chip is like a rotary switch – it internally routes the common pin (COM in the schematic, SIG on the board) to one of 16 channel pins (CHANxx). It works with both digital and analog signals (the voltage can’t be higher than VCC), and the connections function in either direction. To control it, connect 4 digital outputs to the chip’s address select pins (S0-S3), and send it the binary address of the channel you want (see the datasheet for details). This allows you to connect up to 16 sensors to your system using only 5 pins!

Since the mux/demux also works with digital signals, you can use it to pipe TTL-level serial data to or from multiple devices. For example, you could use it to connect the TX pins of 16 devices to one RX pin on your microcontroller. You can then select any one of those 16 devices to listen to. If you want two-way communications, you can add a second board to route your microcontroller’s TX line to 16 device’s RX lines. By using multiple boards, you can create similar arrangements for I2C, SPI, etc.

The internal switches are bidirectional, support voltages between ground and VCC, have low “on” resistance and low “off” leakage, and to prevent crosstalk, perform “break-before-make” switching. The board also breaks out the chip’s “enable” pin, which when driven high, will completely disconnect the common pin (all switches “off”).