MAX7359ETG+T

Specialized Overview

The MAX7359ETG+T is a low-EMI key switch controller with an I2C interface, housed in a 24-pin TQFN package. It monitors up to 64 keys using static matrix scanning and supports metallic or resistive switches up to 5kΩ. The device operates on a supply voltage of +1.62V to +3.6V, drawing under 1µA in sleep mode. It features autosleep and autowake capabilities, a 16-byte FIFO for debounced key events, and configurable open-drain general-purpose outputs.

Specialized Feature Summary

• Static matrix monitoring ensures low electromagnetic interference operation
• Autosleep and autowake functions minimize power consumption
• Configurable interrupt generation based on FIFO levels or time periods
• Supports optional key release detection and autorepeat functionality

Specialized Applications

• Cell phones
• PDAs
• Handheld games
• Portable consumer electronics

Specialized Procurement Notes

Verify the specific suffix ETG+T corresponds to the 24-pin TQFN package with an exposed pad and tape-and-reel packaging. Confirm RoHS compliance and lead-free status as indicated by the plus sign. Ensure the ordering code matches the manufacturer's current nomenclature for this temperature range and package variant.

Specialized Selection Notes

Select this component when low EMI is critical for proximity to sensitive circuit nodes. It is suitable for applications requiring management of up to 64 keys with minimal microprocessor overhead. Consider the trade-off between key scan capacity and available general-purpose outputs if LED driving is required.

Specialized Part Context

This part belongs to the MAX7359 family of 2-wire interfaced key switch controllers. It is designed for portable devices where power efficiency and signal integrity are paramount. The TQFN package provides a compact footprint suitable for space-constrained mobile applications.

Specialized Replacement Considerations

Check for direct pin-compatible alternatives within the Maxim Integrated portfolio that offer similar I2C interfaces and key scanning capacities. Verify that any substitute maintains the same operating voltage range and package dimensions.