MC33975ATEKR2

Specialized Overview

The MC33975ATEKR2 is a multiple switch detection interface with suppressed wake-up and 32 mA wetting current, manufactured by NXP USA Inc. It detects up to 22 switch contacts via SPI. The device operates from 5.5 V to 40 V on VPWR and interfaces with 3.3 V or 5.0 V microprocessors. It features 14 switch-to-ground inputs and 8 programmable inputs for battery or ground switches. Sleep state currents are 100 µA on VPWR and 20 µA on VDD. It utilizes SMARTMOS technology in a 32-pin SOIC-EP package.

Specialized Feature Summary

• Detects opening and closing of up to 22 switch contacts
• Features selectable wetting current of 32 mA or 4.0 mA
• Includes 22-to-1 analog multiplexer for input reading
• Supports low quiescent current sleep mode operation

Specialized Applications

• Automotive systems
• Industrial control systems
• Process control systems
• Security systems

Specialized Procurement Notes

Verify the specific ordering suffix EK/R2 against the official datasheet to confirm the package type and lead-free status. Confirm that the 'A' designation corresponds to the -14 to 40 V DC switch input voltage range. Ensure the component meets RoHS3 compliance requirements before integration into final assemblies.

Specialized Selection Notes

Select this part when interfacing microprocessors to high-voltage switch matrices requiring contact wetting. Choose the 'A' variant if the application demands a switch input voltage range extending to 40 V. Verify that the system can accommodate the 32-pin SOIC-EP footprint and thermal dissipation requirements during normal operation.

Specialized Part Context

This component belongs to the MC33975 family of specialized interface circuits designed for robust switch detection. It replaces discrete components in microprocessor-based systems by integrating pull-up/pull-down currents and wake-up logic. The device is engineered primarily for automotive environments but supports various industrial applications.

Specialized Replacement Considerations

MC33975EK

Specialized FAQ

What is the maximum switch input voltage for the MC33975A?

The MC33975A supports a switch input voltage range of -14 V to 40 V.

How many switch contacts can the device detect?

The device is designed to detect the closing and opening of up to 22 switch contacts.

What is the purpose of the AMUX pin?

The AMUX pin serves as the output for the internal 22-to-1 analog multiplexer, allowing switch inputs to be read as analog signals.