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MC33978AEKR2 The NXP Semiconductors MC33978AEKR2 is a specialized interface IC designed for multiple switch detection. It operates from 4.5V to 36V and features an SPI interface.
Mfr Part #:

MC33978AEKR2

Available from 2 distributors
Mfr Name: NXP Semiconductors
NXP Semiconductors
The NXP Semiconductors MC33978AEKR2 is a specialized interface IC designed for multiple switch detection. It operates from 4.5V to 36V and features an SPI interface.
✓ Total Stock: 1,340 pcs
$ Price Range: $6.39

MC33978AEKR2 Available from 2 distributors

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Xingangxin ✓
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1,340 pcs
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1340 pcs On Request 1 On Request On Request On Request On Request On Request
HK XINYUANXIN ELECTRONIC TECH LIMITED ✓
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On Request
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MC33978AEKR2 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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Manufacturer Name
Applications
Interface
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MC33978AEKR2 Description

Short technical summary and product information.

The MC33978AEKR2 from NXP Semiconductors is a versatile 22-channel multiple switch detection interface IC. It is designed to monitor the status of up to 22 switch contacts, transferring this information to a microprocessor unit (MCU) via a serial peripheral interface (SPI).

 

This device offers flexible operation with a wide voltage range from 4.5 V to 36 V. It includes features such as individually selectable input currents in Normal and Low-power modes, a 24-to-1 analog multiplexer for reading analog inputs, and integrated battery and temperature monitoring. The low-power mode is particularly beneficial for automotive and industrial applications requiring minimal sleep-state current.

 

The MC33978AEKR2 supports various modes including Normal, Low-power (LPM), and Polling modes. It provides selectable wetting currents and programmable wetting operation. The IC is housed in a 32-SOIC-EP package and is surface-mount compatible.

 

Key specifications include 14 Switch-to-Ground (SG) inputs and 8 programmable switch (SP) inputs, with switch input voltage ranging from -1.0 V to 36 V. The analog multiplexer output is buffered for MCU reading, and the device includes an active interrupt output on change-of-switch state.

MC33978AEKR2 Quick Information

Product Type: Specialized Interface IC
Canonical Name: MC33978 22-channel multiple switch detection interface with programmable wetting current
Subcategory: Specialized

MC33978AEKR2 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

MC33978AEKR2 Estimated Pricing

Qty Low High
1+ $6.39 $6.39

Estimated market price range - modelled values for guidance only, not live distributor offers.

MC33978AEKR2 Features

  • 22-channel switch detection interface.
  • Programmable wetting current and operation.
  • SPI serial peripheral interface.
  • Wide operating voltage range: 4.5V to 36V.
  • Integrated analog multiplexer and monitors.

MC33978AEKR2 Applications

  • Automotive and industrial products.
  • Low sleep-state current applications.
  • Switch status monitoring systems.
  • Analog signal acquisition.

MC33978AEKR2 FAQs

5 frequently asked questions generated from this part’s specifications.
What is the operating voltage range for the MC33978AEKR2?

The MC33978AEKR2 operates functionally from 4.5 V to 36 V, with full parametric operation specified from 6.0 V to 28 V.

How many switch detection channels does the MC33978AEKR2 have?

The MC33978AEKR2 features 22 switch detection channels, comprising 14 Switch-to-Ground (SG) inputs and 8 programmable switch (SP) inputs.

What interface protocol does the MC33978AEKR2 use?

The MC33978AEKR2 uses the Serial Peripheral Interface (SPI) for communication with a microprocessor unit.

What package type is the MC33978AEKR2 available in?

The MC33978AEKR2 is available in a 32-SOIC-EP package and a 32-SSOP (0.295", 7.50mm Width) Exposed Pad package, both for surface mounting.

What is the low-power mode quiescent current for the MC33978AEKR2?

In low-power mode, the MC33978AEKR2 has a typical quiescent current of 30 μA (IBATP) and 10 μA (IDDQ).

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