MAX7328AAP+T

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The MAX7328AAP+T is an I/O Expander in Interface category. This device brings out high-current outputs and low-power consumption in a small TSSOP package. It is used to increase the number of IO lines in a system, and provide output current rating up to 100 mA. More importantly, it allows users to have more control over their I/O lines.

Application Field

The MAX7328AAP+T is widely employed in smart home, telecom, and vehicle automation products. It provides a cost-optimized solution for applications requiring additional I/O ports and no extra power. Thus, it becomes a valuable solution for a variety of applications, such as board-level monitoring, remote metering, basic control and residential gateway products.

In addition, the device provides protection against shorts and ESD, but it is not suitable for automotive applications. Nevertheless, its wide supply range, low power, and small package size make it suitable for general non-automotive applications.

Working Principle

The MAX7328AAP+T functions as a universal I/O Expander. When the IO line voltage is high enough, the device will switch on the outputs. When the IO line voltage is low enough, the outputs will switch off. This action is called latching, and it is controlled by the GPIO lines of the device.

The MAX7328AAP+T interfaces to the system host via a 3-wire SPI or I2C serial interface. The device supports up to seven additional address bits, so up to 128 MAX7328AAP+T devices can be connected on the same bus. The device also includes an internal EEPROM with a 10-bit user programmable address to identify the device in a system.

The MAX7328AAP+T has two output “C” and “D”, representing different logic states. When the IO is low, the output “C” is on and the output “D” is off. When the IO is high, the output “D” is on and the output “C” is off.

The device can be used to control up to 8 IO lines with 4-bit addressing, which can be used to drive LEDs, level shift, and control relays. An additional two bits are used for output control and two more for input sense. The device can also be used for controlling 8 LEDs in a PWM dimming control.

This device provides a wide range of features, including no CPU overhead and no need for special software , a large number of power and package options, full Inter-Integrated Circuit (I2C) compliance, low-power low-voltage operation, overvoltage protection, and built-in watchdog timer.

Conclusion

The MAX7328AAP+T is an I/O Expander in Interface category, which is typically used to increase the number of IO lines available and provide output current rating up to 100 mA. It is a cost-optimized solution and is suitable for a variety of applications, like board-level monitoring, remote metering, basic control and residential gateway products. The device interfaces to the system host via either a 3-wire SPI or I2C serial interface, and supports up to seven additional address bits, with an internal EEPROM with a 10-bit user programmable address for device identification. It also comes with features including no CPU overhead and no need for special software, multiple power and package options, I2C compliance, low-power/low-voltage operation, overvoltage protection, as well as a built-in watchdog timer.

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