MC34978 | SDI 22 I/Os Programmable Current Temp Sensor | NXP Semiconductors

Automotive

Industrial

Consumer

Technologies

Switch Detection Interface, 22 I/Os, Programmable Wetting Current, Temp Sensor, 3.3 V / 5.0 V SPI

MC34978
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The NXP MC34978 is a multiple switch detection interface (MSDI) designed to detect the closing and opening of up to 22 switch contacts in industrial environments.

  • The switch status, either open or closed, is transferred to the microprocessor unit through a serial peripheral interface (SPI)
  • This SMARTMOS® device also features a 24-to-1 analog multiplexer for reading analog inputs
  • Individually selectable input currents are available in Normal and Low-Power Mode (LPM), as needed in the application
  • A battery and temperature monitor are included in the IC and are available via the AMUX pin
  • This product interfaces with any microcontroller that supports SPI communications

Block Diagram

Switch Detection Interface, 22 I/Os, Programmable Wetting Current, Temp Sensor, 3.3 V / 5.0 V SPI

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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 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
  • Package termination count: 32
  • HSOP32 and HVQFN32 package type
  • SPI interface and input control
  • Load supply voltage 4.5 V (Min), 36 V (Max)
  • Ambient operating temperature -40 °C (Min), 85 °C (Max)

Buy/Parametrics

2 results

Include 1 NRND

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CAD Model

Device Function

Package Termination Count

Load Supply Voltage (Min) (V)

Load Supply Voltage (Max) (V)

Supply Voltage [min] (V)

Interface and Input Control

Ambient Operating Temperature (Min to Max) (℃)

MC34978AEK
Data Sheet

switch monitoring

32

4.5

36

3.1

SPI

-40 to 85

MC34978AES
Data Sheet

switch monitoring

32

4.5

36

3.1

SPI

-40 to 85

N true 0 PSPMC34978en 4 Application Note Application Note t789 2 Data Sheet Data Sheet t520 1 Errata Errata t522 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 2 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 Errata Errata 1 4 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 false 0 MC34978 downloads en true 1 Y PSP Application Note 2 /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 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 4 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 true Y Products

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