EP0806713A1 - Dispositif de commande avec un oscillateur de mise en veille accordable - Google Patents

Dispositif de commande avec un oscillateur de mise en veille accordable Download PDF

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Publication number
EP0806713A1
EP0806713A1 EP97107367A EP97107367A EP0806713A1 EP 0806713 A1 EP0806713 A1 EP 0806713A1 EP 97107367 A EP97107367 A EP 97107367A EP 97107367 A EP97107367 A EP 97107367A EP 0806713 A1 EP0806713 A1 EP 0806713A1
Authority
EP
European Patent Office
Prior art keywords
oscillator
standby
frequency
control circuit
during
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.)
Granted
Application number
EP97107367A
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German (de)
English (en)
Other versions
EP0806713B1 (fr
Inventor
Hans Reichmeyer
Francesco Colandrea
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.)
STMicroelectronics GmbH
Original Assignee
SGS Thomson Microelectronics 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 SGS Thomson Microelectronics GmbH filed Critical SGS Thomson Microelectronics GmbH
Publication of EP0806713A1 publication Critical patent/EP0806713A1/fr
Application granted granted Critical
Publication of EP0806713B1 publication Critical patent/EP0806713B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B77/00—Vehicle locks characterised by special functions or purposes
    • E05B77/46—Locking several wings simultaneously
    • E05B77/48—Locking several wings simultaneously by electrical means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency

Definitions

  • the invention relates to a control circuit by means of which electrical devices can be controlled and the operating states of which can be monitored.
  • a central locking device of a motor vehicle is controlled and monitored.
  • a control circuit can be used to control and monitor a so-called state machine, which can produce a predetermined number of states, changes from one state to another state on the basis of current states and input variables and thereby generates output signals.
  • a central locking system for a motor vehicle which comprises a transmitter housed in a door key and a receiver housed in the motor vehicle.
  • a code is sent by the transmitter, which is decoded by the receiver and leads to the actuation of the central locking system if the correct code has been sent.
  • the transmitter and receiver thus form a remote control device. So that it can either work with radio frequencies or with light frequencies, both an RF oscillator and a lightwave oscillator, the RF carrier or lightwave of which can be modulated with the code word on the transmission side, and both an RF detector and a lightwave detector on the receiver side are provided whose output signals are fed to a common decoder.
  • a remote-controlled central locking system for a motor vehicle is known, the receiver arranged in the motor vehicle is periodically switched on and off in order to reduce the total power consumption. So that the central locking system reacts in any case when a code signal is transmitted from a transmitter, the transmission-side code pulse sequence is sent a leading pulse, the duration of which is longer than the temporal one Distance between two successive switch-on intervals of the receiver. In this way, the receiver is safely activated by the guide pulse in order to then be able to receive and process the code pulse sequence.
  • the receiver is equipped with a clock pulse generator, which delivers clock pulses corresponding to the switch-on intervals of the receiver to a first input of an AND logic circuit.
  • Pulses received and shaped by the transmitter are fed to a second input of the AND logic circuit. If a pulse is received by the transmitter during a clock pulse from the timer, the resulting output signal of the AND logic circuit triggers a monostable multivibrator whose output signal for a predetermined period of time which is at least as long as the code pulse sequence sent by the transmitter following a command pulse Turns on the power to the receiver. If no pulse was received by the transmitter during a clock pulse from the timer, the power supply of the receiver is only switched on for the respective duration of the clock pulse.
  • a telecontrol system for controlling additional vehicle devices is known, the receiver of which is arranged in the vehicle is periodically switched on and off in order to reduce the average power requirement of the receiver.
  • the transmitter is switched on for a period of time that is so long that at least one switch-on interval of the receiver falls within its time, so that the receiver can respond to a transmission process in any case.
  • a device for operating a microprocessor by means of which the microprocessor can be operated in an active and an inactive operating state in order to protect the battery supplying the microprocessor with power.
  • the microprocessor In the inactive state, the microprocessor can be activated either by a wake-up signal from a watchdog arranged in the microprocessor or by an external wake-up signal which is sent periodically by an external Oscillator is released, brought into the active state.
  • the external oscillator is constructed with two CMOS inverters.
  • a conventional control circuit of the type specified at the beginning comprises a control device, which can be a microcontroller, and a main oscillator, which supplies a clock signal for the operation of the control device.
  • a control circuit can contain a status monitoring device, by means of which the respective statuses of predetermined electrical devices, such as electrical switch contacts, sensors and / or detectors, can be monitored and status signals representing the respective statuses can be supplied to the control device.
  • quartz oscillators with oscillation frequencies in the MHz range are used. Both such control devices and such oscillators consume a relatively large amount of current, which can prove problematic, for example, if the device controlled by the control circuit is not required for a long time. If, for example, a central locking device of a motor vehicle is controlled with such a control circuit, it may happen that the control circuit is not required for a long period of time, for example if the motor vehicle is not used for days, weeks or even months.
  • the control circuit is repeatedly switched back to full operation for a short wake-up time even when there is no need for control.
  • a temporary switch back to full operation usually takes place periodically. For example, after standby periods with a duration of a few seconds each, there is a switch back to full operation for a wake-up time of a few milliseconds in each case.
  • the control circuit is only in the range of a few ⁇ of the total time in full operation, the rest of the time in standby operation. The average power consumption by the control circuit parts with significant power consumption is correspondingly reduced to a few ⁇ of the power consumption that would occur if the control circuit were kept permanently in full operation.
  • an oscillator is required to provide the clock signals required for this purpose, the frequency of these clock signals being able to be significantly lower than that of the quartz oscillator to the control device supplied clock signals. Since the quartz oscillator is switched off during standby mode, this known control circuit uses, in addition to the quartz oscillator serving as the main oscillator, a second oscillator serving as the standby oscillator, which works permanently, has a significantly lower oscillation frequency than the main oscillator and has a significantly lower power consumption than the main oscillator has. Conventionally, for example, an RC oscillator or an IC oscillator in which a capacitance is used is used as the standby oscillator is periodically charged and discharged using a power source and a switch.
  • the control circuit according to the invention can be switched to a standby mode during times when there is no need for control and can be repeatedly switched back to full operation for a short wake-up time during the standby mode. It has a full-operation circuit part which is only operable during full operation of the control circuit and has a frequency-stable main oscillator with a relatively high current requirement. It comprises a standby circuit part, which is operational both in full operation and in standby operation and has a frequency-accurate, tunable standby oscillator with low power consumption. The standby oscillator is tuned during the wake-up times with the help of the main oscillator.
  • the full operating circuit part comprises a control device and the standby circuit part contains a frequency control device in which a frequency control signal controlling the oscillator frequency of the standby oscillator can be stored, and a wake-up device controlled by an output signal of the standby oscillator, by means of which during the wake-up times at least the control device and the main oscillator can be brought into full operation.
  • a frequency measuring device is provided, by means of which a measurement of the actual oscillator frequency of the standby oscillator can be carried out during the wake-up times.
  • This embodiment has a frequency correction device, by means of which the actual oscillator frequency measured during the respective wake-up time is comparable with an oscillator target frequency and by means of which a corrected frequency control signal depending on the respective comparison result can be generated and in each case stored as a new frequency control signal in the frequency control device.
  • the actual frequency of the standby oscillator is measured with each wake-up operation and if the actual frequency of the standby oscillator deviates from its target frequency, the standby oscillator is adjusted to the desired target frequency. Due to the relatively short time intervals between the individual wake-up times, the standby oscillator thus maintains its target frequency with very high reliability, despite its inherently poor frequency constancy.
  • control circuit contains a status monitoring device, by means of which the respective states of predetermined sensors and / or detectors and / or other types of electrical devices can be monitored in standby mode of the control circuit and the control circuit can be switched back to full operation when predetermined states are determined.
  • the control circuit can have a microcontroller which has at least one interrupt input, via which the microcontroller can be switched back from standby to full operation.
  • the frequency of the standby oscillator can be controllable by means of a digital frequency control signal.
  • a digital frequency control signal used to determine which of the tuning current sources is switched on to charge a capacitance of the standby oscillator.
  • the frequency control device can have a frequency control signal register in which the frequency control signal, which is obtained during the respective wake-up time from a comparison of the actual and target frequency of the Standby oscillator has resulted, is storable and its memory content determines the respective frequency of the standby oscillator.
  • the frequency measuring device can have a time window device, by means of which, within the respective wake-up time period, a time window with a window duration dependent on the actual oscillation period duration of the standby oscillator is opened, the number of oscillations of the main oscillator occurring during the window duration are counted and the count value obtained in this way by means of a Frequency comparison device is compared with a reference count value corresponding to the desired oscillation period duration of the standby oscillator.
  • the control circuit according to the invention is suitable for a central locking device for a motor vehicle which has a plurality of electrical switch contacts which are assigned, for example, locking locks located at different points in the motor vehicle and of which at least part of its switching state changes when the central locking device is actuated.
  • the switching states of at least some of the switch contacts can be monitored. If a change in the switching state of at least one of the electrical contacts is detected in standby mode, the system switches back to full mode.
  • the embodiment of a control circuit according to the invention shown in the form of a block diagram in FIG. 1 comprises a microcontroller ⁇ C as the control device, which is under the timing control of a main oscillator MOSC designed as a quartz oscillator, from which the microcontroller ⁇ C receives a main clock signal MCLK via a first microcontroller input IN1.
  • This control circuit also includes a standby oscillator SBOSC, which generates a standby clock signal SBCLK. This is given to a wake-up circuit WUP. Under control of the standby clock signal SBCLK, this periodically generates a wake-up signal, which it supplies to an interrupt input INT of the microcontroller ⁇ C.
  • the wake-up signal is generated at every nth clock pulse of the standby clock signal SBCLK, where n can be any integer.
  • the frequency of the standby oscillator SBOSC can be tuned by means of a digital frequency control signal FCS, which can be stored in a frequency control signal register FCR.
  • the clock frequency SBCLK can be changed by changing the memory content of FCR.
  • the control circuit also has a TIMER as a frequency measuring device, which is connected to the microcontroller via a data bus DB.
  • the frequency measuring device TIMER has a time measuring input ZE, which is connected to the output of an AND logic circuit A, which has a first input E1 connected to the output of the main oscillator MOSC, a second input E2 connected to an output of a gate logic GL and one with the output O connected to the time measurement input ZE.
  • the gate logic GL has a logic input LE, to which the standby clock signal SBCLK is fed.
  • the gate logic GL generates a window signal GATE at a logic output LA under the time control of SBCLK within every m th wake-up time duration, where m can be any integer and is preferably equal to 1, the duration of a time window TF ( 3) is determined and is supplied on the one hand to the second input E2 of A and on the other hand to a second microcontroller input IN2.
  • the AND logic circuit A is transparent to the main clock signal MCLK (FIG. 2) of the main oscillator MOSC.
  • the frequency measuring device TIMER counts the number of clock pulses of the main clock signal MCLK supplied to it during the respective time window TF (FIG. 4).
  • the microcontroller ⁇ C queries the count value reached at the end of the time window TF via the data bus DB from the frequency measuring device TIMER.
  • the main oscillator MOSC has a frequency of 8 MHz and the standby oscillator SBOSC has e.g. a frequency of 32 KHz.
  • the standby oscillator SBOSC has e.g. a frequency of 32 KHz.
  • significantly more clock pulses MCLK fit into the time window TF, which is strictly correlated with the frequency of the standby oscillator SBOSC and, for example, has the duration of a clock pulse from SBCLK, than is shown in FIGS. 2 to 4.
  • a nominal count value is stored in the microcontroller ⁇ C, which corresponds to a predetermined nominal frequency of the standby oscillator SBOSC.
  • the frequency control signal written into the frequency control signal register FCR determines the respective frequency of the standby oscillator SBOSC until the frequency control signal register FCR is supplied by the microcontroller ⁇ C with a new frequency control signal.
  • FIG. 5 shows a preferred embodiment of a standby oscillator SBOSC suitable for the control circuit according to the invention.
  • This standby oscillator is constructed in a manner known per se as an IC oscillator, that is to say as an oscillator which has a capacitor which is periodically alternately charged by means of a current source device and discharged by means of a switch.
  • the oscillator shown in FIG. 5 comprises a series circuit connected between a supply voltage source UB and a ground connection GND with a capacitor C and four current sources S1 to S4 connected in parallel with one another.
  • a first switch SW1 is connected in parallel to the capacitor C.
  • a switching point P between the capacitor C and the current sources S1 to S4 is connected to an input of a comparator COM, the output signal of which controls the switching state of the switch SW1.
  • the current source S1 serves as the main current source and is permanently connected to the capacitor C.
  • the current sources S2 to S4 serve as tuning current sources.
  • One of three switches SW2 to SW4 is connected between each of the tuning current sources S2 to S4 and the voltage supply source UB.
  • the switching states of the switches SW2 to SW4 are controlled by means of switch control signals FCS1, FCS2 and FCS3, which are are different bit positions of the frequency control signal FCS stored in the frequency control signal register FCR.
  • the tuning current sources S2 to S4 deliver different sized current values I 1 or I 1/2 or I 1/4 and are weighted according to the dual number system.
  • the oscillator shown in FIG. 5 functions in such a way that the capacitor C is charged with the current of at least the main current source S1 when the switch SW1 is open.
  • the charging voltage of the capacitor C increases accordingly until this charging voltage reaches a predetermined reference value, whereupon the comparator COM generates an output signal which brings the switch SW1 into its conductive state, which leads to a sudden discharge of the capacitor C.
  • This alternating charging and discharging of the capacitor is repeated periodically, the steepness of the rise in the charging voltage and thus the respective duration of the charging process being dependent on the charging current. This in turn depends on how many of the tuning current sources S2 to S4 are switched on by means of the associated switches SW2 to SW4. And this is determined by the digital frequency control signal FCS stored in the frequency control signal register FCR.
  • the wake-up circuit WUP can simultaneously be used as a state monitoring device, by means of which the various states of predetermined (not shown) sensors and / or detectors or other electrical devices, for example electrical switch contacts, are assigned to the various locking locks of the motor vehicle are monitored.
  • the mode of operation of the control circuit shown in FIG. 1 is considered below in the event that it is used in connection with the control of a central locking device for a motor vehicle.
  • control circuit is working, that is to say that it is in full operation. If no control requirement has been determined by the control circuit for a predetermined period of time by means of the condition monitoring device, for example because either the motor vehicle as a whole is not used or the central locking system has not been operated for a long time, the microcontroller .mu.C is activated by means of a stop command in the current program step stopped and turned off.
  • the microcontroller ⁇ C is switched on via the input INT for a respective wake-up time of, for example, 1 ms, which also turns on the Main oscillator leads MOSC.
  • a time window TF is generated by means of the gate logic GL, with the aid of ⁇ C the comparison between the actual frequency and the target frequency of the standby oscillator SBOSC is carried out and the new frequency control signal, which depends on the result of this comparison, is entered into the frequency control signal register FCR inscribed, which leads to a corresponding control of the switches SW2 to SW4 of the standby oscillator SBOSC shown in FIG.
  • the microcontroller ⁇ C and the main oscillator MOSC are switched off again.
  • the wake-up circuit WUP detects a change in state during a standby time period with regard to one or more of the electrical contacts monitored by it, it gives one immediately, ie without waiting for the next wake-up time, via the interrupt input INT Interrupt command acting as a wake-up signal to the microcontroller ⁇ C, whereupon this and the main oscillator MOSC are switched on, the control circuit is thus switched back to full operation. Since the microcontroller .mu.C is switched off in each case by a stop command, the microcontroller .mu.C continues with each wake-up operation in the program step in which it was previously switched off by the stop command.
EP97107367A 1996-05-06 1997-05-05 Dispositif de commande avec un oscillateur de mise en veille accordable Expired - Lifetime EP0806713B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19618094 1996-05-06
DE19618094A DE19618094C2 (de) 1996-05-06 1996-05-06 Steuerschaltung mit nachstimmbarem Standby-Oszillator

Publications (2)

Publication Number Publication Date
EP0806713A1 true EP0806713A1 (fr) 1997-11-12
EP0806713B1 EP0806713B1 (fr) 2002-09-25

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EP97107367A Expired - Lifetime EP0806713B1 (fr) 1996-05-06 1997-05-05 Dispositif de commande avec un oscillateur de mise en veille accordable

Country Status (3)

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US (1) US5973617A (fr)
EP (1) EP0806713B1 (fr)
DE (1) DE19618094C2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN101182744B (zh) * 2007-12-04 2011-05-04 深圳市海贝斯智能科技有限公司 双路控制电子门锁

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US6917608B1 (en) 2000-12-22 2005-07-12 National Semiconductor Corporation Microsequencer microcode bank switched architecture
US6963554B1 (en) 2000-12-27 2005-11-08 National Semiconductor Corporation Microwire dynamic sequencer pipeline stall
US6971036B2 (en) * 2001-04-19 2005-11-29 Onwafer Technologies Methods and apparatus for low power delay control
DE10127424B4 (de) * 2001-06-06 2004-09-02 Infineon Technologies Ag Elektronische Schaltung mit asynchroner Taktung von Peripherieeinheiten
EP1267021B1 (fr) * 2001-06-13 2007-10-31 Freescale Semiconductor, Inc. Dispositif de communication passif et système de contrôle d'accès passif
DE10232671B4 (de) * 2002-07-18 2004-12-30 Webasto Thermosysteme Gmbh Reformer für ein Brennstoffzellensystem für ein Fahrzeug
DE10306568A1 (de) * 2003-02-17 2004-08-26 Delphi Technologies, Inc., Troy Elektronische Schließvorrichtung
DE10316805B4 (de) * 2003-04-11 2010-04-08 Continental Automotive Gmbh Verfahren und Vorrichtung zur Erhöhung der Betriebssicherheit einer elektrischen Komponente
US7496774B2 (en) * 2004-06-04 2009-02-24 Broadcom Corporation Method and system for generating clocks for standby mode operation in a mobile communication device
TWI264873B (en) * 2005-02-05 2006-10-21 Neotec Semiconductor Ltd Wake up circuit
US8159241B1 (en) * 2007-04-24 2012-04-17 Marvell International Ltd. Method and apparatus for on-chip adjustment of chip characteristics
EP2525265B1 (fr) * 2011-05-14 2015-06-03 Johnson Controls Automotive Electronics GmbH Procédé de fonctionnement d'un dispositif d'horloge
US10071778B2 (en) * 2015-12-31 2018-09-11 Sierra Extreme Torque stick apparatus and methods of use
CN115709710B (zh) * 2022-12-15 2023-09-05 江苏润石科技有限公司 车辆车身稳定控制方法、芯片及系统

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EP0118108B1 (fr) * 1983-03-04 1991-05-02 Nec Corporation Mémoire à accès aléatoire avec mode d'opération actif et mode d'opération d'attente
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US4264967A (en) * 1978-10-20 1981-04-28 Citizen Watch Co., Ltd. Unit time producing system
EP0015873B1 (fr) * 1979-03-09 1983-04-13 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Oscillateur avec un résonateur basse fréquence à quartz
US4456386A (en) * 1980-11-26 1984-06-26 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Timepiece having a divider chain with an adjustable division rate
EP0118108B1 (fr) * 1983-03-04 1991-05-02 Nec Corporation Mémoire à accès aléatoire avec mode d'opération actif et mode d'opération d'attente
EP0457964A1 (fr) * 1990-05-11 1991-11-27 Webasto AG Fahrzeugtechnik Appareil de commande à distance, en particulier pour la commande d'équipements pour voiture
EP0586256A2 (fr) * 1992-09-04 1994-03-09 Nokia Mobile Phones Ltd. Système de mesure de temps

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101182744B (zh) * 2007-12-04 2011-05-04 深圳市海贝斯智能科技有限公司 双路控制电子门锁

Also Published As

Publication number Publication date
DE19618094A1 (de) 1997-11-20
US5973617A (en) 1999-10-26
EP0806713B1 (fr) 2002-09-25
DE19618094C2 (de) 1999-06-02

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