CD74HC4067칩을 사용하여 16채널의 아날로그/디지털 확장이 가능합니다.

4개의 디지털핀과 1개의 아날로그핀으로 16개의 아날로그 신호를 읽어들일 수 있습니다.

아날로그 신호는 VCC를 넘을 수 없습니다.

디지털 신호를 읽어들이는 것도 가능하며 TTL 로직의 통신(UART, I2C, SPI등)의 확장으로도 사용이 가능합니다.

특징

동작 전압 : 2 ~ 6V

동작 저항 : 70옴(4.5V)

break-before-make : 6ns(4.5V)

동작 온도 : -55 ~ 125도

관련 문서

• Schematic
• Eagle Files
• Datasheet
• bildr blog - CD74HC4067
• GitHub

Description: 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").

Features:

• 2V to 6V operation
• "On" resistance: 70 Ohms @ 4.5V
• 6ns break-before-make @ 4.5V
• Wide operating temperature range: -55C to 125C

Documents:

• Schematic
• Eagle Files
• Datasheet
• bildr blog - CD74HC4067