MC33978 | 22 I/O MSDI Programmable AMUX | NXP Semiconductors

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22 I/O MSDI Programmable Current Analog Mux

MC33978
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The NXP MC33978 is a multiple switch detection interface (MSDI) designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor through a SPI in automotive environments.

  • This SMARTMOS® device features a 24-to-1 analog multiplexer for reading analog inputs
  • The analog input signal is buffered and provided on the analog multiplexer (AMUX) output pin for the MCU to read
  • Individually selectable input currents are available in Normal and Low-Power Mode
  • Battery and temperature monitor are included in the IC and available via the AMUX pin
  • Interfaces with any MCU that supports SPI communications

Block Diagram

MC33978: 22 I/O Switch Detection Interface, Programmable Wetting Current, Analog Mux

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Features

Key Features

  • Designed to operate 4.5 V ≤ VBATP ≤ 36 V
  • Switch input voltage range -14 V to VPWR, 36 V Max.
  • Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol
  • Selectable wake-up on change of state
  • Selectable wetting current (2, 6, 8, 10, 12, 14, 16, or 20 mA)
  • 8 programmable inputs (switches to battery or ground) and 14 switch-to-ground inputs
  • Typical standby current - VBATP = 30 uA and VDD = 10 uA
  • Integrated battery and temperature sensing
  • Switch monitoring device function
  • 32 and 48 package termination count
  • HLQFP48, HSOP32 and HVQFN32 package type
  • Ambient operating temperature -40 to 125 °C

Buy/Parametrics

3 results

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Part

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CAD Model

Device Function

Package Termination Count

Load Supply Voltage (Min) (V)

Load Supply Voltage (Max) (V)

Interface and Input Control

Ambient Operating Temperature (Min to Max) (℃)

MC33978AAE
Data Sheet

switch monitoring

48

4.5

36

SPI

-40 to 125

MC33978AEK
Data Sheet

switch monitoring

32

4.5

36

SPI

-40 to 125

MC33978AES
Data Sheet

switch monitoring

32

4.5

36

SPI

-40 to 125

N true 0 PSPMC33978en 8 Application Note Application Note t789 4 Data Sheet Data Sheet t520 1 Errata Errata t522 1 Fact Sheet Fact Sheet t523 1 Selector Guide Selector Guide t528 1 en_US 1 1 10 English The 33978 is designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI). Individually selectable input currents are available in Normal and Low-power (LPM) modes, as needed for the application. 1417640273906725959333 PSP 1.1 MB None None documents None 1417640273906725959333 /docs/en/data-sheet/MC33978.pdf 1115227 /docs/en/data-sheet/MC33978.pdf MC33978 N N 2017-02-08 MC33978, 22 Channel Switch Detection Interface with Programmable Wetting Current Data Sheet /docs/en/data-sheet/MC33978.pdf /docs/en/data-sheet/MC33978.pdf Data Sheet N Y 980000996212993340 2024-08-22 pdf N en Aug 20, 2024 Data Sheet t520 Data Sheet Data Sheet Y N MC33978, 22 Channel Switch Detection Interface with Programmable Wetting Current Data Sheet false en_US en Application Note Application Note 4 2 2.0 Chinese 1319753989104702481752zh PSP 7.6 MB Registration without Disclaimer None documents Extended 1319753989104702481752 /secured/assets/documents/zh/application-note/AN4388.pdf 7584935 /secured/assets/documents/zh/application-note/AN4388.pdf AN4388 documents Y N 2016-10-31 AN4388: Quad Flat Package (QFP) – Application Note /secured/assets/documents/zh/application-note/AN4388.pdf https://www.nxp.com.cn/webapp/Download?colCode=AN4388&docLang=zh Application Note N 645036621402383989 2024-01-19 zh May 10, 2022 645036621402383989 Application Note Y N AN4388，四方扁平封装(QFP) - 应用说明 3 English Providing guidelines for the handling and board mounting of NXP's QFP packages. Including recommendations for the design of Printed Circuit Boards (PCB), board mounting, and rework. Also providing generic information of package properties: Moisture Sensitivity Level (MSL) rating, board level reliability, mechanical and thermal resistance data. Because semiconductor components are electrically and mechanically sensitive devices, proper precautions for handling, packing and processing QFP packages are described. 1319753989104702481752 PSP 7.6 MB Registration without Disclaimer None documents Extended 1319753989104702481752 /secured/assets/documents/en/application-note/AN4388.pdf 7584935 /secured/assets/documents/en/application-note/AN4388.pdf AN4388 documents Y N 2016-10-31 AN4388: Quad Flat Package (QFP) – Application Note /webapp/Download?colCode=AN4388 /secured/assets/documents/en/application-note/AN4388.pdf Application Note N 645036621402383989 2024-01-19 pdf Y en Aug 31, 2019 645036621402383989 Application Note Y N AN4388: Quad Flat Package (QFP) – Application Note 3 1.0 English This document presents the main concepts behind the wheel location algorithm of the KWL software. The document details the approach used and explains how this led to the current implementation. 1485456925034706793334 PSP 6.7 MB Registration without Disclaimer None documents Extended 1485456925034706793334 /secured/assets/documents/en/application-note/AN5322.pdf 6749797 /secured/assets/documents/en/application-note/AN5322.pdf AN5322 documents Y N 2017-01-26 AN5322: TPMS Wheel Location Introduction and Main Concepts Application Note /webapp/Download?colCode=AN5322 /secured/assets/documents/en/application-note/AN5322.pdf Application Note N 645036621402383989 2024-01-19 pdf Y en Jan 25, 2017 645036621402383989 Application Note Y N AN5322: TPMS Wheel Location Introduction and Main Concepts Application Note 4 1.0 English The purpose of this document is to provide a more detailed description of the LPM (Low-power mode) operation on the MC33978. 1444422547297715261432 PSP 346.8 KB None None documents None 1444422547297715261432 /docs/en/application-note/AN5195.pdf 346828 /docs/en/application-note/AN5195.pdf AN5195 documents N N 2015-10-09 AN5195, MC33978 Low-power Mode Operation - Application Note /docs/en/application-note/AN5195.pdf /docs/en/application-note/AN5195.pdf Application Note N 645036621402383989 2022-12-07 pdf N en Sep 29, 2015 645036621402383989 Application Note Y N AN5195, MC33978 Low-power Mode Operation - Application Note 5 1.0 English The MC33978 is a 22 channel switch detection interface designed to monitor multiples system switches and communicate its open/close status via SPI communication protocol. 1427227895429721244040 PSP 2.2 MB None None documents None 1427227895429721244040 /docs/en/application-note/AN5098.pdf 2159414 /docs/en/application-note/AN5098.pdf AN5098 documents N N 2015-03-24 AN5098, MC33978 Power Consumption Calculation - Application Note /docs/en/application-note/AN5098.pdf /docs/en/application-note/AN5098.pdf Application Note N 645036621402383989 2022-12-07 pdf N en Mar 24, 2015 645036621402383989 Application Note Y N AN5098, MC33978 Power Consumption Calculation - Application Note Errata Errata 1 6 3.0 English This errata document applies to MC33978 and MC34978 devices. 1435089996383695935441 PSP 101.8 KB None None documents None 1435089996383695935441 /docs/en/errata/MC33978ER.pdf 101780 /docs/en/errata/MC33978ER.pdf MC33978ER documents N N 2017-01-11 MC33978ER, MC33978 Mask N11P - Errata /docs/en/errata/MC33978ER.pdf /docs/en/errata/MC33978ER.pdf Errata N 155452329886410597 2022-12-07 pdf N en Dec 13, 2017 155452329886410597 Errata N MC33978ER, MC33978 Mask N11P - Errata Fact Sheet Fact Sheet 1 7 2.0 English NXP’s configurable and integrated I/O-multiple switch detection interface delivers strong, reliable and cost-effective results for automotive and industrial applications. 1512583658719740840743 PSP 121.6 KB None None documents None 1512583658719740840743 /docs/en/fact-sheet/MSDIA4FS.pdf 121562 /docs/en/fact-sheet/MSDIA4FS.pdf MSDIA4FS documents N N 2017-12-06 Multiple Switch Detection Interface (MSDI) /docs/en/fact-sheet/MSDIA4FS.pdf /docs/en/fact-sheet/MSDIA4FS.pdf Fact Sheet N 736675474163315314 2023-09-29 pdf N en Feb 24, 2021 736675474163315314 Fact Sheet Y N Multiple Switch Detection Interface (MSDI) Selector Guide Selector Guide 1 8 3 Chinese 1404924651029729642615zh PSP 1.2 MB None None documents None 1404924651029729642615 /docs/zh/product-selector-guide/INDCONTANLPRDFL.pdf 1202686 /docs/zh/product-selector-guide/INDCONTANLPRDFL.pdf INDCONTANLPRDFL documents N N 2016-10-31 Analog Automotive and Industrial Selector Guide /docs/zh/product-selector-guide/INDCONTANLPRDFL.pdf /docs/zh/product-selector-guide/INDCONTANLPRDFL.pdf Selector Guide N 553557935274807777 2025-01-05 zh Sep 18, 2014 553557935274807777 Selector Guide Y N 面向工业市场的模拟产品 - 简介 12 English For system designers who want more efficient motor operation with variable speed and sensorless control, NXP offers H-bridge, brushed and brushless DC motor drivers required to complete system design. 1404924651029729642615 PSP 1.2 MB None None documents None 1404924651029729642615 /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf 1202686 /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf INDCONTANLPRDFL documents N N 2016-10-31 Analog Automotive and Industrial Selector Guide /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf Selector Guide N 553557935274807777 2025-01-05 pdf N en Jan 29, 2021 553557935274807777 Selector Guide Y N Analog Automotive and Industrial Selector Guide false 0 MC33978 downloads en true 1 Y PSP Y Y Application Note 4 /secured/assets/documents/en/application-note/AN4388.pdf 2016-10-31 1319753989104702481752 PSP 2 Aug 31, 2019 Application Note Providing guidelines for the handling and board mounting of NXP's QFP packages. Including recommendations for the design of Printed Circuit Boards (PCB), board mounting, and rework. Also providing generic information of package properties: Moisture Sensitivity Level (MSL) rating, board level reliability, mechanical and thermal resistance data. Because semiconductor components are electrically and mechanically sensitive devices, proper precautions for handling, packing and processing QFP packages are described. Registration without Disclaimer /secured/assets/documents/en/application-note/AN4388.pdf English documents 7584935 None 645036621402383989 2024-01-19 Y /webapp/Download?colCode=AN4388 AN4388: Quad Flat Package (QFP) – Application Note /secured/assets/documents/en/application-note/AN4388.pdf documents 645036621402383989 Application Note N en Extended Y pdf 3 Y N AN4388: Quad Flat Package (QFP) – Application Note 7.6 MB AN4388 N 1319753989104702481752 /secured/assets/documents/en/application-note/AN5322.pdf 2017-01-26 1485456925034706793334 PSP 3 Jan 25, 2017 Application Note This document presents the main concepts behind the wheel location algorithm of the KWL software. The document details the approach used and explains how this led to the current implementation. Registration without Disclaimer /secured/assets/documents/en/application-note/AN5322.pdf English documents 6749797 None 645036621402383989 2024-01-19 Y /webapp/Download?colCode=AN5322 AN5322: TPMS Wheel Location Introduction and Main Concepts Application Note /secured/assets/documents/en/application-note/AN5322.pdf documents 645036621402383989 Application Note N en Extended Y pdf 1.0 Y N AN5322: TPMS Wheel Location Introduction and Main Concepts Application Note 6.7 MB AN5322 N 1485456925034706793334 /docs/en/application-note/AN5195.pdf 2015-10-09 1444422547297715261432 PSP 4 Sep 29, 2015 Application Note The purpose of this document is to provide a more detailed description of the LPM (Low-power mode) operation on the MC33978. None /docs/en/application-note/AN5195.pdf English documents 346828 None 645036621402383989 2022-12-07 N /docs/en/application-note/AN5195.pdf AN5195, MC33978 Low-power Mode Operation - Application Note /docs/en/application-note/AN5195.pdf documents 645036621402383989 Application Note N en None Y pdf 1.0 N N AN5195, MC33978 Low-power Mode Operation - Application Note 346.8 KB AN5195 N 1444422547297715261432 /docs/en/application-note/AN5098.pdf 2015-03-24 1427227895429721244040 PSP 5 Mar 24, 2015 Application Note The MC33978 is a 22 channel switch detection interface designed to monitor multiples system switches and communicate its open/close status via SPI communication protocol. None /docs/en/application-note/AN5098.pdf English documents 2159414 None 645036621402383989 2022-12-07 N /docs/en/application-note/AN5098.pdf AN5098, MC33978 Power Consumption Calculation - Application Note /docs/en/application-note/AN5098.pdf documents 645036621402383989 Application Note N en None Y pdf 1.0 N N AN5098, MC33978 Power Consumption Calculation - Application Note 2.2 MB AN5098 N 1427227895429721244040 Data Sheet 1 /docs/en/data-sheet/MC33978.pdf 2017-02-08 1417640273906725959333 PSP 1 Aug 20, 2024 Data Sheet Data Sheet The 33978 is designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI). Individually selectable input currents are available in Normal and Low-power (LPM) modes, as needed for the application. None /docs/en/data-sheet/MC33978.pdf English 1115227 None Data Sheet 2024-08-22 N /docs/en/data-sheet/MC33978.pdf MC33978, 22 Channel Switch Detection Interface with Programmable Wetting Current Data Sheet /docs/en/data-sheet/MC33978.pdf documents 980000996212993340 Data Sheet N Y en None Y t520 pdf 10 N N MC33978, 22 Channel Switch Detection Interface with Programmable Wetting Current Data Sheet 1.1 MB MC33978 N 1417640273906725959333 Errata 1 /docs/en/errata/MC33978ER.pdf 2017-01-11 1435089996383695935441 PSP 6 Dec 13, 2017 Errata This errata document applies to MC33978 and MC34978 devices. None /docs/en/errata/MC33978ER.pdf English documents 101780 None 155452329886410597 2022-12-07 N /docs/en/errata/MC33978ER.pdf MC33978ER, MC33978 Mask N11P - Errata /docs/en/errata/MC33978ER.pdf documents 155452329886410597 Errata N en None pdf 3.0 N N MC33978ER, MC33978 Mask N11P - Errata 101.8 KB MC33978ER N 1435089996383695935441 Fact Sheet 1 /docs/en/fact-sheet/MSDIA4FS.pdf 2017-12-06 1512583658719740840743 PSP 7 Feb 24, 2021 Fact Sheet NXP’s configurable and integrated I/O-multiple switch detection interface delivers strong, reliable and cost-effective results for automotive and industrial applications. None /docs/en/fact-sheet/MSDIA4FS.pdf English documents 121562 None 736675474163315314 2023-09-29 N /docs/en/fact-sheet/MSDIA4FS.pdf Multiple Switch Detection Interface (MSDI) /docs/en/fact-sheet/MSDIA4FS.pdf documents 736675474163315314 Fact Sheet N en None Y pdf 2.0 N N Multiple Switch Detection Interface (MSDI) 121.6 KB MSDIA4FS N 1512583658719740840743 Selector Guide 1 /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf 2016-10-31 1404924651029729642615 PSP 8 Jan 29, 2021 Selector Guide For system designers who want more efficient motor operation with variable speed and sensorless control, NXP offers H-bridge, brushed and brushless DC motor drivers required to complete system design. None /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf English documents 1202686 None 553557935274807777 2025-01-05 N /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf Analog Automotive and Industrial Selector Guide /docs/en/product-selector-guide/INDCONTANLPRDFL.pdf documents 553557935274807777 Selector Guide N en None Y pdf 12 N N Analog Automotive and Industrial Selector Guide 1.2 MB INDCONTANLPRDFL N 1404924651029729642615 true Y Products

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