MCP23009T-E/SS

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The MCP23009T-E/SS is a type of integrated circuit, or IC, that belongs to a category known as an interface-I/O expanders. It is produced by the manufacturer Microchip Technology. This IC offers a range of features that allow for various design objectives to be achieved. In this article, we will explore what specific applications the MCP23009T-E/SS is suited for and look at its working principles.

Application Field

The MCP23009T-E/SS is ideally used in situations where discrete input and output functions need to be expanded without having to resort to a microcontroller. For instance, various digital devices could benefit from the features offered by this IC, such as a camera or a printer. Its primary applications lie in the field of robotics and automation, as it is well suited to provide the necessary commands and logic operations to allow a robot to function. The IC can also provide a great deal of flexibility when interfacing with LCD displays or LED strips, allowing the user to easily control their behavior.

Working Principle

The MCP23009T-E/SS internally consists of multiple 8-bit parallel bidirectional I/O ports, each with interrupt-on-change capability. This IC provides an SPDT switch with digital inputs. It also provides open-drain outputs for two MOSFETs per port. This integrated circuit features an internal pull-up and current-limiting resistor for each of the digital input pins, allowing digital inputs to be pulled up to VCC. The MCP23009T-E/SS has two hardware address pins, A0 and A1, and two hardware reset pins, RST and CS that can be used to set different configurations. VCC and GND are the power supply and ground pins respectively.

The IC also contains registers, with each register having a specific purpose. All of the registers can be read or written with a single command. This IC has an interrupt-on-change feature, which is triggered by a change in the level of any of the I/O pins. In addition, it has an I2C-type serial bus interface that allows data to be read or written to and from the I/O ports in the background. The IC can be powered by either 3.3V or 5V.

Conclusion

The MCP23009T-E/SS is an interface-I/O expander suitable for a variety of applications, from robotics and automation to LCD displays, LED strips, printers and digital devices. It features 8-bit parallel bidirectional I/O ports with interrupt-on-change capability and various registers. It also has an I2C-type bus interface, two address pins and two reset pins. This IC can be powered by either 3.3V or 5V and it is produced by Microchip Technology.

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