MAX7359EWA+T

Specialized Overview

The MAX7359EWA+T is a low-EMI key switch controller and general-purpose output device manufactured by Analog Devices Inc./Maxim Integrated. It provides I2C interfaced management for up to 64 key switches, generating unique codes for press and release events. The component operates within a supply voltage range of +1.62V to +3.6V and supports an I2C clock frequency up to 400kHz with 5.5V-tolerant inputs. It features autosleep and autowake capabilities, drawing under 1µA in sleep mode. The device is housed in a 25-bump WLP package measuring 2.31mm x 2.31mm and functions reliably across a temperature range of -40°C to +85°C.

Specialized Feature Summary

• Static matrix monitoring ensures low electromagnetic interference during key scanning
• Autosleep and autowake mechanisms minimize power consumption while maintaining FIFO data integrity
• Configurable interrupt outputs alert the host processor to debounced key events
• Flexible port configuration allows column drivers to function as open-drain general-purpose outputs

Specialized Applications

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

Specialized Procurement Notes

Verify the specific ordering suffix EWA+T corresponds to the 25-bump WLP package variant rather than the TQFN version. Confirm lead-free and RoHS compliance status directly from the manufacturer's documentation. Ensure the intended application environment remains within the specified -40°C to +85°C operating temperature limits for reliable performance.

Specialized Selection Notes

Select this component when static key scanning is required to reduce system noise compared to dynamic scanning methods. Consider the trade-off between available key scan ports and general-purpose outputs, as utilizing GPOs reduces the maximum number of scannable keys. Verify that the microcontroller supports the required I2C interface specifications and can handle the interrupt signaling modes provided by the device.

Specialized Part Context

This part belongs to the MAX7359 family of 2-Wire Interfaced Low-EMI Key Switch Controllers. The EWA+ suffix specifically denotes the 25-bump Wafer-Level Package (WLP) variant designed for space-constrained portable applications. Other variants in the series include the ETG+ which utilizes a 24-pin TQFN package. Both variants share identical electrical characteristics and functional capabilities.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.