CP82C55A-5

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The CP82C55A-5 is a powerful I/O expanders used to provide additional input/output ports for systems. It is an 8-bit I/O expander device containing a 20-line input/output port. The device has been designed to provide a simple and cost-effective solution when more than the typical eight input/output lines are required for a system.

This device provides an efficient interface between a system bus (which controls inputs and outputs) and I/O pins distributed on multiple devices such as sensors, switches, pushbuttons, relays, and display devices. It is well suited for control, automation, data acquisition, and measurement applications. The process of adding the extra I/O pins is straightforward and the ultra-low power CMOS technology used makes the CP82C55A-5 suitable for battery-operated equipment and low-voltage operations.

Applications

The CP82C55A-5 can be found in routers and switches, embedded controllers, solar charge controllers, home security and safety systems, industrial control systems, robotics, and avionics systems. The device provides a simple and cost-effective solution to add additional peripheral or interface devices to a system. It is also used to adapt the existing systems for different communications formats. For example, the device can be used to convert optical signals or analog signals to digital.

General Features

• Eight lines can be configured as inputs, outputs or bidirectional buses
• Interrupt pins are provided for every 8 bits
• Programmable I/O ports available in 8-bit or single port mode
• End of scan interrupt is generated after 8 cycles
• Configurable I/O direction and polarity
• Input pins are individually programmable with internal pull-up resistors
• Full static CMOS technology
• Input hysteresis and Latch-up protection
• Operate from supply voltage 2.5V to 5.5V

Working Principle

The CP82C55A-5 is controlled by two ports called the PORT A and the PORT B. The PORT A is used to read the 8-bit data from the input pins. The PORT B is used for the output, it sends the 8-bit data to the I/O lines. Control lines like PORT A INH, PORT B INH, ALE and low active interrupt pin INT are used to operate the device.

When the ALE pin goes low, the PORT B outputs the 8-bit data to the I/O lines. The I/O lines can be configured as inputs or outputs using the PORT A INH and PORT B INH pins which are active low. The input pins provide a hysteresis feature to simplify the external RC circuits. The device also enables the user to program each pin individually as an input or output.

The CP82C55A-5 can be programmed for interrupt-on-change feature. This feature generates an interrupt whenever any of the 8 I/O lines change state. The INT pin is an active low interrupt pin, which is active until the change-of-state is serviced. The device can also be programmed for end-of-scan interrupt feature and this interrupt is generated after every 8 cycles.

Conclusion

The CP82C55A-5 is a powerful I/O expander device that can be used to add additional input/output ports to your system. It is used for applications ranging from data acquisition, to measurement, to control and automation. The device provides a cost-effective and simple solution for adding additional input/output pins to a system. It is designed with full static CMOS technology and provides input hysteresis, latch-up protection, and interrupt-on-change operation.

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