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DE102020206440A1 - Circuit concept with a system base chip and a CAN driver - Google Patents

Circuit concept with a system base chip and a CAN driver Download PDF

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Publication number
DE102020206440A1
DE102020206440A1 DE102020206440.7A DE102020206440A DE102020206440A1 DE 102020206440 A1 DE102020206440 A1 DE 102020206440A1 DE 102020206440 A DE102020206440 A DE 102020206440A DE 102020206440 A1 DE102020206440 A1 DE 102020206440A1
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DE
Germany
Prior art keywords
driver
base chip
system base
wake
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE102020206440.7A
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German (de)
Inventor
Yannick Chauvet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Priority to DE102020206440.7A priority Critical patent/DE102020206440A1/en
Priority to PCT/EP2021/058421 priority patent/WO2021239301A1/en
Publication of DE102020206440A1 publication Critical patent/DE102020206440A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40039—Details regarding the setting of the power status of a node according to activity on the bus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40267—Bus for use in transportation systems
    • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Logic Circuits (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

Die Erfindung betrifft eine Schaltung (10) mit einem System-Basis-Chip (12) und einem vom System-Basis-Chip (12) separaten CAN-Treiber (14). Es wird vorgeschlagen, dass der CAN-Treiber (14) CAN Botschaften sendet und empfängt und im System-Basis-Chip (12) eine Wake-Up-Funktion für den CAN-Treiber (14) implementiert ist.The invention relates to a circuit (10) with a system base chip (12) and a CAN driver (14) that is separate from the system base chip (12). It is proposed that the CAN driver (14) send and receive CAN messages and that a wake-up function for the CAN driver (14) be implemented in the system base chip (12).

Description

Die Erfindung betrifft ein Schaltungskonzept mit einem System-Basis-Chip und einem CAN-Treiber.The invention relates to a circuit concept with a system base chip and a CAN driver.

Stand der TechnikState of the art

Es ist Stand der Technik, dass in Motorsteuergeräten für Kraftfahrzeuge eine sogenannte „CAN Wake up“ Funktion implementiert ist. Das Motorsteuergerät, das sich in einem „Stand-by“-Ruhezustand befindet, empfängt dabei über die CAN Kommunikations-Schnittstelle durch einen anderen CAN-Bus Teilnehmer ein Signal, wodurch das Motorsteuergerät in einen aktiven Zustand übergeht. Obwohl sich das zu weckende Motorsteuergerät in einem Ruhezustand befindet, fließt ein sehr geringer Ruhestrom, bei dem eine gewisse Mindestfunktionalität den CAN auf bestimmte Bit-Muster oder Puls-Längen überwacht und bei passendem Muster den Weckvorgang einleitet.It is state of the art that a so-called “CAN wake up” function is implemented in engine control units for motor vehicles. The engine control unit, which is in a “stand-by” idle state, receives a signal from another CAN bus participant via the CAN communication interface, whereby the engine control unit changes to an active state. Although the engine control unit to be woken up is in a quiescent state, a very low quiescent current flows, in which a certain minimum functionality monitors the CAN for certain bit patterns or pulse lengths and initiates the wake-up process if the pattern matches.

Die Funktion zum Wecken des Motorsteuergerätes ist üblicherweise ein Teil des CAN-Treibers, der im Normalbetrieb auch die Schnittstelle für die komplette CAN-Kommunikation bildet.The function for waking up the engine control unit is usually part of the CAN driver, which in normal operation also forms the interface for the entire CAN communication.

Die ICs, die die interne Spannungsversorgung des Steuergeräts erzeugen, weisen ebenfalls einen CAN-Treiber auf. Somit werden sowohl die die interne Logik als auch die Spannungsversorgung gewährleistet ohne eine externe Zusatzschaltung. Problematisch ist, dass die Halbleitertechnologien nicht darauf ausgelegt sind, einen guten Kompromiss zwischen ESD-Festigkeit (Robustheit gegen elektrostatische Entladungen) und EMV-Festigkeit (Funktionssicherheit bei elektromagnetischen Störungen) zu erzielen.The ICs that generate the control unit's internal voltage supply also have a CAN driver. In this way, both the internal logic and the power supply are guaranteed without an additional external circuit. The problem is that the semiconductor technologies are not designed to achieve a good compromise between ESD resistance (robustness against electrostatic discharges) and EMC resistance (functional reliability in the event of electromagnetic interference).

Offenbarung der ErfindungDisclosure of the invention

Der Vorteil der Erfindung besteht darin, bei Normalbetrieb den CAN Treiber für die Kommunikation von der CAN-wake-up Funktion zu trennen. Letztere ist dann nur noch ein Eingang bzw. ein „stiller Zuhörer“ im Stand-by-Betrieb, der auf das „Wake-up“ Ereignis achtet. Das Senden und Empfangen von CAN-Botschaften erfolgt über einen separaten CAN-Treiber. Somit wird ein hinsichtlich ESD und hinsichtlich EMV robustes design erzielt. Weiterer Vorteil ist ein einfaches und kostengünstiges ASIC Design.The advantage of the invention is to separate the CAN driver for communication from the CAN wake-up function during normal operation. The latter is then just an input or a “silent listener” in stand-by mode, who pays attention to the “wake-up” event. A separate CAN driver is used to send and receive CAN messages. A robust design with regard to ESD and EMC is thus achieved. Another advantage is a simple and inexpensive ASIC design.

FigurenlisteFigure list

  • 1 zeigt ein Schaltungskonzept mit einem System-Basis-Chip und einem CAN-Treiber. 1 shows a circuit concept with a system base chip and a CAN driver.

Beschreibungdescription

1 zeigt ein Schaltungskonzept mit einem ersten Baustein 12 und einem zweiten Baustein 14. Der erste Baustein 12 ist als System-Basis-Chip ausgebildet. Der zweite Baustein 14 ist als CAN-Treiber ausgebildet. 1 shows a circuit concept with a first module 12th and a second building block 14th . The first building block 12th is designed as a system base chip. The second building block 14th is designed as a CAN driver.

Der System-Basis-Chip wird über eine interne Spannungsversorgung UInt versorgt. Im System-Basis-Chip 12 ist ein Logikbaustein 16 integriert. Im Logikbaustein 16 ist eine Wake-Up-Funktion für den CAN-Treiber 14 implementiert.The system base chip is supplied via an internal voltage supply U Int . In the system base chip 12th is a logic module 16 integrated. In the logic module 16 is a wake-up function for the CAN driver 14th implemented.

Über den in Kraftfahrzeugen häufig verwendeten CAN-Bus wird der CAN Treiber 14 mittels vom Logikbaustein 16 gesendeten Weckinformation geweckt.The CAN driver 14th by means of the logic module 16 wake-up information sent.

Der am Bus angeschlossene CAN Treiber 14 kann seine Logik ganz abschalten oder in einen Sleepmode bringen. Der ebenfalls am Bus angeschlossene System-Basis-Chip 12 wird mit einer Stand-By-Stromversorgung versehen.The CAN driver connected to the bus 14th can switch off its logic completely or put it into sleep mode. The system base chip, which is also connected to the bus 12th is provided with a stand-by power supply.

Erst bei Detektion eines charakteristischen Signals wird die Wake-Up-Logik aktiviert.The wake-up logic is only activated when a characteristic signal is detected.

Ein Hauptrelais 20 schließt, wenn die wake-up Logik aufgeweckt wurde. Dies ist insbesondere dann der Fall, wenn das Schaltungskonzept ein „non-permanent-supplied“ System ist. Bei „permanent-supplied“ Systemen, schließt das Hauptrelais möglicherweise nicht, weil die Aktuatoren in diesem wake-up Modus nicht versorgt werden sollen. In beiden Systemen jedoch gilt, dass Der System-Basis-Chip durch ein wake-up Ereignis wach wird und dafür sorgt, dass der CAN Treiber versorgt wird.A main relay 20th closes when the wake-up logic is awakened. This is particularly the case when the circuit concept is a "non-permanent-supplied" system. With "permanently-supplied" systems, the main relay may not close because the actuators should not be supplied in this wake-up mode. In both systems, however, the system base chip is woken up by a wake-up event and ensures that the CAN driver is supplied.

Im Normalbetrieb werden die CAN Funktionen durch den CAN-Treiber 14 mit hierfür optimierter Technologie realisiert. Das Signal S1 wird im Normalbetrieb empfanen. S2 wird im Normalbereib gesendet.In normal operation, the CAN functions are performed by the CAN driver 14th realized with technology optimized for this purpose. The signal S1 is received in normal operation. S2 is sent in normal mode.

Claims (3)

Schaltung (10) mit einem System-Basis-Chip (12) und einem vom System-Basis-Chip (12) separaten CAN-Treiber (14), wobei der CAN-Treiber (14) CAN Botschaften sendet und empfängt und im System-Basis-Chip (12) eine Wake-Up-Funktion für den CAN-Treiber (14) implementiert ist.Circuit (10) with a system base chip (12) and a CAN driver (14) separate from the system base chip (12), the CAN driver (14) sending and receiving CAN messages and Base chip (12) a wake-up function for the CAN driver (14) is implemented. Schaltung (10) nach Anspruch 1, wobei der CAN Treiber (14) und die Wake-Up-Funktion für den CAN-Treiber (14) getrennt voneinander betrieben werden.Circuit (10) according to Claim 1 , whereby the CAN driver (14) and the wake-up function for the CAN driver (14) are operated separately from one another. Schaltung (10) nach einem der Ansprüche 1 oder 2, wobei die wake-up Funktion ein Eingang ist, der auf ein Wake up- Ereignis achtet.Circuit (10) according to one of the Claims 1 or 2 , whereby the wake-up function is an input that pays attention to a wake-up event.
DE102020206440.7A 2020-05-25 2020-05-25 Circuit concept with a system base chip and a CAN driver Pending DE102020206440A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102020206440.7A DE102020206440A1 (en) 2020-05-25 2020-05-25 Circuit concept with a system base chip and a CAN driver
PCT/EP2021/058421 WO2021239301A1 (en) 2020-05-25 2021-03-31 Circuit design with a system basis chip and a can driver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020206440.7A DE102020206440A1 (en) 2020-05-25 2020-05-25 Circuit concept with a system base chip and a CAN driver

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120271975A1 (en) 2009-12-28 2012-10-25 Nxp B.V. Definition of wakeup bus messages for partial networking
US20170005828A1 (en) 2015-07-01 2017-01-05 Qualcomm Technologies International, Ltd. Low-power can management
US20190116480A1 (en) 2016-03-29 2019-04-18 Xped Holdings Pty Ltd Method and apparatus for a network and device discovery
US20200382337A1 (en) 2019-05-29 2020-12-03 Trane International Inc. Hvac controller area network hybrid network topology

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611945C1 (en) * 1996-03-26 1997-11-20 Daimler Benz Ag Device for the bus-connected operation of an electronic device with a microcontroller and its use
DE19611944C2 (en) * 1996-03-26 2003-03-27 Daimler Chrysler Ag Integrated circuit for coupling a micro-controlled control unit to a two-wire bus
DE19611942C2 (en) * 1996-03-26 2003-02-20 Daimler Chrysler Ag Semiconductor circuit for an electronic control unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120271975A1 (en) 2009-12-28 2012-10-25 Nxp B.V. Definition of wakeup bus messages for partial networking
US20170005828A1 (en) 2015-07-01 2017-01-05 Qualcomm Technologies International, Ltd. Low-power can management
US20190116480A1 (en) 2016-03-29 2019-04-18 Xped Holdings Pty Ltd Method and apparatus for a network and device discovery
US20200382337A1 (en) 2019-05-29 2020-12-03 Trane International Inc. Hvac controller area network hybrid network topology

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NXP Semiconductors: TJA1042 High-speed CAN transceiver with Standby mode.Rev. 10 - 24 November 2017Product data sheetpp. 1-26. Product data sheet

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