MAX7326AEG+T

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Interface - I/O Expanders are tools used to extend the number of input and output ports of a microcontroller. They allow the user to take I/O commands from the microcontroller and translate them into commands to other devices, while also providing additional I/O ports. The MAX7326AEG+T is one such I/O Expander, providing 16 digital input or output ports in a tiny 5 × 5 mm package. In this article, we’ll discuss the MAX7326AEG+T application fields and working principle.

MAX7326AEG+T Application Fields

The MAX7326AEG+T is designed to meet the needs of battery- powered designs, where one of its key advantages over other I/O Expanders is its ultra-low quiescent current of just 0.7 μA. It is ideal for such applications as personal healthcare, sports and entertainment electronics, industrial control and motor drive applications, and even wearableronics. It is also perfect for applications requiring multiple input or output ports, such as application-specific embedded controllers, remote sensors, wireless networks, and medical devices.

The MAX7326AEG+T is a 4-port programmable I/O Expander with serial interfacing, integrated level-shifting and a wide range of functions. Its I/O ports can be configured individually as inputs, outputs, high-impedance inputs, analog inputs, or be combined to create 2-wire UART or 3-wire SPI-style serial interfaces. It supports two logic families, namely – 5-V and 3.3-V, with 0.2-V to 4.7-V digital input and output voltage ranges, making it an ideal choice for battery-powered designs.

In addition, the MAX7326AEG+T is fully digital with an embedded 10-bit Analog-to-Digital Converter (ADC). This function provides an additional 10 analog inputs for monitoring such low-level signals as light sensors, temperature sensors, and other environmental data. It also supports power management, allowing power to be optimized according to the application.

MAX7326AEG+T Working Principle

The MAX7326AEG+T is controlled through a serial interface. This two-wire interface can be configured as a SPI or I2C, whichever is most appropriate for the application. All I/O ports can be configured using the serial interface and an integrated register map. Through the register map, the user can set which input and output ports are active, set their logic values, and manage power consumption.

The MAX7326AEG+T also incorporates an automatic source/ sink capability. This allows the user to set an input pin as a source controlled by the processor, or an output pin as a sink controlled by the input pin. This feature helps reduce power consumption by allowing the user to control which pins are active and when. In addition, the MAX7326AEG+T provides level shifting on all its ports, enabling two logic voltage families to be mixed in one design.

The MAX7326AEG+T also features built-in reset functionality, allowing the user to reset the I/O Expander at any time. It also offers watch-dog functionality that can be used to detect errors and reset the I/O Expander in the event of a fault. This feature greatly enhances the reliability of the system.

Conclusion

The MAX7326AEG+T I/O Expander is an ideal choice for low-power, battery-operated designs. Its feature set makes it ideal for applications requiring multiple inputs and outputs, as well as for applications requiring source and sink functionality. In addition, its integrated ADC and built-in reset and watch-dog functions provide added levels of reliability. CLEVO, the official distributor of Maxim Integrated, has a wide range of MAX7326AEG+T parts in stock, ready for purchase and immediate shipping.

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