As technology advances and market demands evolve, sensors continue to upgrade users' "smart" sensing experience. With innovations in servers, automobiles, AI, and IoT, many MCUs have a limited number of built-in serial ports. However, as different projects continue to expand their functionalities, the need for additional I/O ports arises, making an I²C general-purpose I/O (GPIO) expansion chip essential.

Have you encountered these challenges in your daily design work?

1. The designed product requires multiple I/O ports for display, storage, conversion, and other functions.

2. The microcontroller used in the design has insufficient built-in I/O resources.

3. During revisions, the number of sensor signals monitored by the MCU increases, and the number of LEDs used as system status indicators also grows, leading to a shortage of I/O ports.

To address these issues, we offer a more efficient, convenient, and cost-effective I/O expansion solution. Here are some commonly recommended options:

Option 1: 8-bit I/O Expansion Chip for I²C Bus – GXA574

For users with moderate I/O interface requirements, the GXA574 provides 8-bit quasi-bidirectional GPIO ports (P0~P7), all capable of directly driving LEDs. These quasi-bidirectional GPIO ports require no direction control signals and can function as input and output ports. Port data is transmitted via the standard two-wire I²C protocol. Upon power-up, all GPIO ports default to a high level.

Option 2: 16-bit I/O Expansion Chip for I²C Bus – GXA535

Developed independently by Zhongke Galaxy Semiconductor, the GXA535 offers 16-bit push-pull GPIO ports (P0[0] ~P1[7]), all of which can directly drive LEDs. The GPIO ports can function as inputs or outputs, with port direction controlled by a configuration register. Port data is transmitted via the standard two-wire I²C protocol. Upon power-up, all GPIO ports default to input mode (high impedance state).

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