MC33972ATEK

Specialized Overview

The MC33972ATEK is a multiple switch detection interface with suppressed wake-up, designed to detect up to 22 switch contacts. It operates within a supply voltage range of 5.5 V to 26 V and supports an input voltage range from -14 V to 40 V. The device features 8 programmable switches (SP0-SP7) configurable for battery or ground connections, and 14 switch-to-ground inputs (SG0-SG13). It interfaces directly with microprocessors via a 3.3 V or 5.0 V SPI protocol at frequencies up to 6.0 MHz. Key electrical characteristics include a typical standby current of 100 µA at VPWR and 20 µA at VDD. The component is housed in a 32-pin SOICW EP package.

Specialized Feature Summary

• Supports direct connection to microprocessors using standard 3.3 V or 5.0 V SPI communication protocols.
• Features selectable wetting currents of 16 mA or 2.0 mA to ensure reliable switch contact closure.
• Includes an integrated 22-to-1 analog multiplexer allowing all switch inputs to be read as analog signals.
• Provides ultra-low quiescent current in sleep mode, making it suitable for automotive applications requiring low power consumption.

Specialized Applications

• Automotive body control modules
• Industrial remote I/O systems
• Programmable logic controllers

Specialized Procurement Notes

Verify the EK suffix indicates the 32-pin SOIC Wide Exposed Pad package variant. Confirm the ATE designation aligns with the specific temperature and operational requirements defined in the official NXP datasheet. Ensure external reverse battery protection is included in the design, as the VPWR pin requires it.

Specialized Selection Notes

Select this component when interfacing with up to 22 switches requiring both digital status monitoring and analog capability. The EK package offers improved thermal performance compared to standard SOIC variants. Ensure the system design accommodates the required external clamping for transient voltages exceeding 40 V on the VPWR line.

Specialized Part Context

This device belongs to the MC33972 family of multiple switch detection interfaces. The EK suffix specifically denotes the 32-pin SOIC Wide Exposed Pad package, which provides enhanced thermal dissipation capabilities compared to the standard EW suffix package. It serves as a robust bridge between mechanical switch contacts and digital processing units.

Specialized Replacement Considerations

MC33972ATEW is the equivalent part number utilizing the standard 32-pin SOIC Wide package without the exposed pad. Verify that the PCB footprint can accommodate the thermal pad requirements if switching from the EK variant to the EW variant.