PCF8574APWRG4

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The PCF8574APWRG4 is an integrated input/output (I/O) expander used to expand the I/O capabilities of an embedded system. It is a peripheral device that is used to increase the number of I/O pins on a system, while minimizing the number of the pins needed on the microcontroller.

The PCF8574APWRG4 is part of the PCF8574 family of I/O expanders provided by NXP Semiconductor. These expanders are designed to provide additional features, such as input/output Expansion, Interrupt capability, and Serial IO. The PCF8574APWRG4 is a low-power stand-alone I/O expander for the two-line bidirectional I2C-bus. It includes a low-power standby mode and is available in a space-saving package. It is ideal for controlling LEDs, buttons, touch screens, and other digital input/outputs.

Application Field

The PCF8574APWRG4 is ideal for use in embedded applications, such as medical devices, wearable electronics, security systems, home appliances, industrial machinery, and automotive electronics. It is also suitable for applications that require additional I/O, such as controlling LEDs, LCDs, buttons, and sensitive sensing elements. With its low power consumption, this I/O expander is especially well-suited for use in portable, battery-driven devices. Additionally, it can be used in data acquisition, data communications, and automation systems.

Working Principle

The PCF8574APWRG4 works by expanding the I/O pins of a controller to up to 16 I/O lines. It receives data through a bus interface called the I2C bus. The PCF8574APWRG4 has a total of 8 data lines, 6 of which can be used as inputs and 2 as outputs, while the other 6 lines of the device are used to transmit the I2C control signals. The I2C interface is configured to work with the 2-wire protocol and can handle up to 400 kHz of communication speed.

The device has a 16-bit input buffer, which can be configured as 8 single-bit inputs, or 4 8-bit ports. The direction of each input or output line is configured independently via a special function register. The device also has an output buffer, which can be configured as either 4 8-bit ports or 8 single-bit ports.

The device can be operated in either low-power standby or full operating mode. The low-power standby mode provides an extremely low current draw of 5µA, while the full operating mode draws 8.9 mA. This makes the device ideal for applications that require low power consumption, such as battery powered applications.

The PCF8574APWRG4 also includes an interrupt input. The interrupt input is programmable and can be used to signal that the device has received data or to wake up the microcontroller from a low power state. The device also includes a serial data rate of 400 kHz, which allows it to communicate quickly with the microcontroller.

Conclusion

The PCF8574APWRG4 is a highly integrated I/O expander which offers a reliable and low-power solution to increase the I/O of an embedded system. With its low power modes, interrupt capability, and fast communication speed, the PCF8574APWRG4 is ideal for use in low power applications, such as medical, security, home appliances, industrial, and automotive electronics.

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