The recommended layout and routing for the MAX7301AAX+ involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the traces between the MAX7301AAX+ and the microcontroller. A 4-layer PCB with a dedicated analog ground plane is recommended.
To ensure proper power and decoupling, use a 0.1uF ceramic capacitor between VCC and GND, and a 10uF electrolytic capacitor between VCC and GND. Place the capacitors as close to the MAX7301AAX+ as possible. Also, ensure that the power supply is clean and regulated.
The MAX7301AAX+ can support I2C bus frequencies up to 400 kHz. However, it's recommended to use a frequency of 100 kHz or less to ensure reliable operation.
The MAX7301AAX+ can be configured for 16-bit or 12-bit mode by setting the MODE pin high or low, respectively. In 16-bit mode, the device uses 16-bit registers, while in 12-bit mode, it uses 12-bit registers.
The INT pin on the MAX7301AAX+ is an active-low interrupt output that indicates when a key press or release event occurs. It can be connected to an interrupt input on a microcontroller to generate an interrupt when a key event occurs.
MAX7301AAX+ datasheet
by Maxim Integrated Products
