WO2004049089A2 - Procédé pour réduire la consommation de courant d'un microprocesseur doté d'un circuit de surveillance - Google Patents

Procédé pour réduire la consommation de courant d'un microprocesseur doté d'un circuit de surveillance Download PDF

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Publication number
WO2004049089A2
WO2004049089A2 PCT/DE2003/003433 DE0303433W WO2004049089A2 WO 2004049089 A2 WO2004049089 A2 WO 2004049089A2 DE 0303433 W DE0303433 W DE 0303433W WO 2004049089 A2 WO2004049089 A2 WO 2004049089A2
Authority
WO
WIPO (PCT)
Prior art keywords
microprocessor
watchdog
watchdog circuit
circuit
deactivated
Prior art date
Application number
PCT/DE2003/003433
Other languages
German (de)
English (en)
Other versions
WO2004049089A3 (fr
Inventor
Markus Heckel
Manfred Kulesch
Original Assignee
Conti Temic Microelectronic Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Conti Temic Microelectronic Gmbh filed Critical Conti Temic Microelectronic Gmbh
Publication of WO2004049089A2 publication Critical patent/WO2004049089A2/fr
Publication of WO2004049089A3 publication Critical patent/WO2004049089A3/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/24—Resetting means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode

Definitions

  • the invention relates to a method for reducing the power consumption of a microprocessor with a watchdog circuit, in which the microprocessor having an idle state and an active state emits trigger watchdog signals to the watchdog circuit at certain time intervals, and the watchdog circuit issues a reset signal generated for the microprocessor in the absence of a trigger watchdog signal.
  • watchdog circuits for monitoring the function of microprocessors. If the program runs correctly, the microprocessor controls the watchdog circuit at certain intervals by generating trigger watchdog signals. This means that the program sequence of the microprocessor remains undisturbed, unless a malfunction occurs, for example by the microprocessor "getting stuck" during a program step. In such an event, the triggering of the watchdog circuit by means of a trigger watchdog signal is omitted, as a result of which the watchdog circuit is caused to emit a reset signal to the microprocessor. This will reset the microprocessor to the program start (reset function).
  • Energy-saving operation is aimed at in battery-operated electronic systems with processor circuits. This is achieved in that microprocessors can be operated in two operating states, namely in an active state (active mode) and in an idle state (sleep mode), the latter being distinguished from the active state by a lower current consumption. If a continuous power supply to the microprocessor is required, it can this can only be switched to the idle state if the watchdog circuit is deactivated. In automotive applications, especially safety-critical applications, however, the watchdog circuit may only be deactivated if malfunctions based on malfunctions by the microprocessor, e.g. incorrect triggering of occupant protection devices (airbag, belt tensioners) are excluded.
  • the object of the invention is therefore to provide a method according to the preamble of the patent claim which leads to a reduction in power consumption without at the same time increasing the risk of faulty controls based on processing errors of the microprocessor.
  • the watchdog monitoring is only deactivated when the microprocessor is in sleep mode, that is to say it draws only a small amount of current compared to the active operating state.
  • the value of the current consumption of the microprocessor is detected and the watchdog function is deactivated when it falls below a certain threshold.
  • a faulty control of the processor is impossible, since in its idle state the outputs are switched off and therefore no malfunction can be initiated. If the microprocessor is switched from the idle state back to the active operating state, the current consumption increases, with the result that the watchdog circuit is reactivated.
  • the watchdog circuit is preferably deactivated in the simplest manner by interrupting the reset line by a switch or pulling it to reference potential, so that no reset impulse reaches the microprocessor.
  • the current consumption can be reduced even further in a microprocessor with a watchdog circuit if the watchdog circuit is deactivated by switching it off.
  • microprocessor consumes only a small current even in the active operating state, a clear current increase can be achieved for the safe activation of the watchdog circuit in that at one Output of the microprocessor is briefly connected to a resistor.
  • FIG. 1 a block diagram for carrying out the method according to the invention
  • Figure 2 a detailed circuit design of part of the
  • FIG. 3 a circuit design of the ignition output stage 3 which is modified compared to the block diagram according to FIG. 1.
  • FIG. 1 shows a control circuit 1 for safety devices, such as airbags, belt tensioners, belt force limiters and roll bars in motor vehicles.
  • safety devices are indicated in this figure 1 with reference numerals 4 ⁇ to 4 n and are controlled by an ignition output stage 3 with output stages 3 ⁇ to 3 n , which in turn receive their control signals, in particular the trigger signals, from a microprocessor ⁇ C.
  • the control circuit contains an ASIC circuit (Application Specific Integrated Circuit) 2, which is controlled and monitored by the microprocessor ⁇ C via an SPI interface (serial peripheral interface).
  • This ASIC circuit 2 contains, in addition to a 5V supply voltage circuit Q v , which serves to supply the voltage to the microprocessor ⁇ C, a watchdog circuit WD, a current measuring circuit M with an input Ei, and an output E 2 connected to the voltage connection U ⁇ c of the microprocessor ⁇ C and with a measuring output 4 and an evaluation circuit A.
  • the ASIC circuit 2 is supplied with energy by an operating voltage source B, which generally represents the vehicle battery of a motor vehicle, via a switch Si, for example the ignition switch of a motor vehicle.
  • an operating voltage source B which generally represents the vehicle battery of a motor vehicle
  • a switch Si for example the ignition switch of a motor vehicle.
  • the microprocessor ⁇ C is monitored by the watchdog circuit WD, in that the microprocessor ⁇ C transmits so-called TWD signals (trigger watchdog) to the watchdog circuit WD at regular intervals depending on the program to be processed via the line TWD. If there is no such TWD signal or if the timing is not correct, the watchdog circuit WD generates a reset pulse via the Reset line, which resets the microprocessor ⁇ C (reset function).
  • the microprocessor ⁇ C adopts two operating modes, namely an active operating state (active mode) or a power-saving idle state (sleep mode), which consumes considerably less current than the active operating state.
  • active mode active operating state
  • secondary idle state secondary idle state
  • the microprocessor ⁇ C can only be controlled in the idle state if the watchdog circuit WD is also deactivated at the same time.
  • this is only permissible due to the safety-critical aspect if a false triggering of the safety devices 4 ⁇ to 4 n is excluded.
  • the current measurement circuit M is connected to the power supply line between the 5V supply voltage circuit Qs v and the voltage connection U ⁇ c of the microprocessor ⁇ C and supplies a current proportional and at the measurement output 4 available voltage value, which is fed to the inverting input of a comparator K of the evaluation circuit.
  • the non-inverting input of this comparator K receives a reference value generated by a reference circuit Ref, with which the measured voltage value is compared. If this voltage value falls below the reference value, a high level is generated at the output of the comparator and fed to the first input of an AND gate AND.
  • the second input of this AND gate AND is connected via a line 5 to the SPI Interface of the microprocessor ⁇ C connected and receives a signal requesting the shutdown of the watchdog circuit WD, ie the microprocessor ⁇ C requests the shutdown of the watchdog circuit WD via the SPI interface when the microprocessor ⁇ C changes to the idle state.
  • a high level is therefore present at the output of the AND gate AND when the microprocessor ⁇ C is in the idle state and at the same time the current consumption of the microprocessor ⁇ C is below the reference value.
  • this AND gate AND deactivates the watchdog circuit WD by either opening a switch S 2 which interrupts the reset line to the microprocessor ⁇ C, or by means of a line 6 (shown in dashed lines in FIG. 1) the watchdog Circuit WD is switched off, the latter possibility being particularly energy-saving since the watchdog circuit does not cause any current consumption in this state.
  • FIG. 2 shows a circuit example for the measuring circuit M for generating a voltage value proportional to the current flow.
  • this measuring circuit M has a current shunt R, at which a voltage drop between two connections Ei and E 2 is generated and fed to an amplifier V, which amplifies this voltage drop and makes it available at the measurement output 4.
  • the method according to the invention is of course not restricted to applications from the automotive field, but can always be used when safety-related aspects play a role and the watchdog circuit is implemented as an external functional unit for the microprocessor ⁇ C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Power Sources (AREA)
  • Debugging And Monitoring (AREA)

Abstract

L'invention concerne un procédé pour réduire la consommation de courant d'un microprocesseur doté d'un circuit de surveillance, selon lequel le microprocesseur comportant un mode veille et un mode actif envoie des signaux de déclenchement de surveillance au circuit de surveillance à des intervalles de temps précis, le circuit de surveillance générant un signal de remise à zéro du microprocesseur en cas d'absence de signal de déclenchement de surveillance. La présente invention porte également sur l'application de ce procédé dans des appareils de commande pour véhicules automobiles, notamment des appareils de commande pour des installations de sécurité. Lorsque des microprocesseurs dotés de circuits de surveillance sont utilisés dans des systèmes automobiles, en particulier dans des systèmes de sécurité tels que des systèmes de protection des occupants, et pour réduire la consommation de courant de ces systèmes, le microprocesseur n'est commuté en mode veille que si le circuit de surveillance est simultanément désactivé, c'est-à-dire que le microprocesseur n'est pas surveillé. Toutefois, pour des utilisations automobiles concernant la sécurité, le circuit de surveillance ne peut être déconnecté que dans la mesure où des erreurs de commande du microprocesseur ou des erreurs de déclenchement des dispositifs de protection des occupants (coussins gonflables) sont exclues. Selon l'invention, le circuit de surveillance n'est désactivé que lorsque le microprocesseur est en mode veille, donc qu'il ne capte que peu de courant par rapport au mode actif. A cet effet, la valeur du captage de courant par le microprocesseur est détectée et si elle est inférieure à un seuil défini, la fonction de surveillance est désactivée. Il n'y a pas d'erreur de commande du microprocesseur puisque, lorsque celui-ci est en mode veille, les sorties sont déconnectées.
PCT/DE2003/003433 2002-11-28 2003-10-16 Procédé pour réduire la consommation de courant d'un microprocesseur doté d'un circuit de surveillance WO2004049089A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10255430.7 2002-11-28
DE10255430A DE10255430A1 (de) 2002-11-28 2002-11-28 Verfahren zur Reduzierung des Stromverbrauchs eines Mikroprozessors mit Watchdog-Schaltung

Publications (2)

Publication Number Publication Date
WO2004049089A2 true WO2004049089A2 (fr) 2004-06-10
WO2004049089A3 WO2004049089A3 (fr) 2004-12-23

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PCT/DE2003/003433 WO2004049089A2 (fr) 2002-11-28 2003-10-16 Procédé pour réduire la consommation de courant d'un microprocesseur doté d'un circuit de surveillance

Country Status (2)

Country Link
DE (1) DE10255430A1 (fr)
WO (1) WO2004049089A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100485554C (zh) * 2005-04-15 2009-05-06 虹光精密工业（苏州）有限公司 一种系统电路静电防护方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006029514B3 (de) * 2006-06-27 2007-05-31 Atmel Germany Gmbh Schaltungsanordnung und Verfahren zum Steuern mindestens eines Aktors in einem Kraftfahrzeug
DE102011016706A1 (de) 2011-04-11 2012-10-11 Conti Temic Microelectronic Gmbh Schaltungsanordnung mit Fail-Silent-Funktion
EP2743794B1 (fr) * 2012-12-14 2016-06-29 Elmos Semiconductor Aktiengesellschaft Procédé de surveillance de l'état de fonctionnement d'une unité de commande pour un composant électrique, notamment pour un composant de véhicule

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747082C1 (de) * 1997-10-24 1999-01-28 Dspecialists Ges Fuer Innovati Schaltungsanordnung zur zeitweisen Deaktivierung einer Überwachungsschaltung für einen Mikroprozessor
US5903767A (en) * 1988-12-09 1999-05-11 Dallas Semiconductor Corporation Integrated circuit for providing supervisory functions to a microprocessor
EP1014269A1 (fr) * 1996-12-02 2000-06-28 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Dispositif de controle pour ordinateur
US20020104031A1 (en) * 2000-12-06 2002-08-01 Tomlinson Jock F. Programmable power management system and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3914003C2 (de) * 1989-04-27 1995-10-05 Siemens Ag Anordnung zur Überwachung des Programmablaufes einer zumindest einen Mikroprozessor enthaltenden Steuerungsbaugruppe
DE3920696A1 (de) * 1989-06-24 1991-01-10 Bosch Gmbh Robert Mikroprozessor-schaltungsanordnung mit watchdog-schaltung
DE19712375A1 (de) * 1997-03-25 1998-10-01 Bosch Gmbh Robert Watchdog-Schaltung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5903767A (en) * 1988-12-09 1999-05-11 Dallas Semiconductor Corporation Integrated circuit for providing supervisory functions to a microprocessor
EP1014269A1 (fr) * 1996-12-02 2000-06-28 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Dispositif de controle pour ordinateur
DE19747082C1 (de) * 1997-10-24 1999-01-28 Dspecialists Ges Fuer Innovati Schaltungsanordnung zur zeitweisen Deaktivierung einer Überwachungsschaltung für einen Mikroprozessor
US20020104031A1 (en) * 2000-12-06 2002-08-01 Tomlinson Jock F. Programmable power management system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100485554C (zh) * 2005-04-15 2009-05-06 虹光精密工业（苏州）有限公司 一种系统电路静电防护方法

Also Published As

Publication number Publication date
WO2004049089A3 (fr) 2004-12-23
DE10255430A1 (de) 2004-06-09

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