EP2708962A1 - Circuit intégré d'horloge à temps réel - Google Patents

Circuit intégré d'horloge à temps réel Download PDF

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Publication number
EP2708962A1
EP2708962A1 EP12184873.3A EP12184873A EP2708962A1 EP 2708962 A1 EP2708962 A1 EP 2708962A1 EP 12184873 A EP12184873 A EP 12184873A EP 2708962 A1 EP2708962 A1 EP 2708962A1
Authority
EP
European Patent Office
Prior art keywords
integrated circuit
real time
embedded
time
receiver
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
EP12184873.3A
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German (de)
English (en)
Other versions
EP2708962B1 (fr
Inventor
Irina Mladenova
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.)
Rohm Co Ltd
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Rohm Co Ltd
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Filing date
Publication date
Application filed by Rohm Co Ltd filed Critical Rohm Co Ltd
Priority to EP12184873.3A priority Critical patent/EP2708962B1/fr
Publication of EP2708962A1 publication Critical patent/EP2708962A1/fr
Application granted granted Critical
Publication of EP2708962B1 publication Critical patent/EP2708962B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
    • G04R20/04—Tuning or receiving; Circuits therefor

Definitions

  • the invention relates to an integrated circuit comprising an integrated real time clock unit adapted to provide a precise real time for an electronic device.
  • a conventional real time clock circuit can be formed by a chip used in a computer or a mobile device to keep a current time and date.
  • an object of the present invention to provide an integrated circuit comprising an integrated real time clock unit adapted to provide a precise real time without any necessary adjustments by the user of a device within which the integrated circuit is provided when the device is moved between different time zones.
  • the invention accordingly provides an integrated circuit comprising an integrated real time clock unit adapted to provide a precise real time, said integrated circuit comprising at least one embedded multizone receiver adapted to receive external synchronization signals transmitted on predetermined signal frequencies, wherein a current real time of said real time clock unit is corrected according to a time information carried in said received external synchronization signal having the highest signal strength to provide the precise real time.
  • the at least one embedded multizone receiver of the integrated circuit comprises an embedded multizone radio receiver adapted to receive and demodulate received external radio synchronization signals transmitted on predetermined radio signal frequencies.
  • the embedded multizone receiver of said integrated circuit is powered up by a power management unit of said integrated circuit from a power-down sleeping mode to a time correction mode for a predetermined time period in regular time intervals to correct the current real time according to the time information carried in said received external synchronization signals.
  • the embedded multizone receiver of said integrated circuit is connected to at least one antenna of said integrated circuit to receive said external synchronization signals.
  • the at least one antenna of said integrated circuit comprises a ferrite antenna.
  • said real time clock unit of the integrated circuit is connected to an embedded quartz crystal of said integrated circuit to provide a current real time stored in a real time memory of said real time clock unit.
  • the current real time stored in said real time memory of said real time clock unit is corrected according to time information carried in the received external synchronization signal having the highest signal strength when said embedded multizone receiver is powered up by said power management unit to operate in said time correction mode.
  • the integrated power management unit switches said embedded multizone receiver from said power-down sleeping mode for a predetermined time period to said power-up time correction mode in response to an embedded signal received by said real time clock unit in regular time intervals determined on the basis of the current real time stored in said real time memory of said real time clock unit.
  • the integrated circuit further comprises a battery which supplies said real time clock unit having a low power consumption permanently with electrical power and said embedded multizone receiver only when it has been switched by said power management unit in said power-up time correction mode.
  • the battery is embedded in a package of said integrated circuit.
  • said integrated circuit comprises at least one embedded multizone receiver and/or an integrated embedded multizone GPS/GALILEO receiver adapted to extract in time information carried in a received GPS signal.
  • the invention further provides a user device comprising an integrated circuit with an integrated real time clock unit adapted to provide a precise real time, said integrated circuit of said user device comprising at least one embedded multizone receiver adapted to receive external synchronization signals transmitted on predetermined signal frequencies, wherein a current real time of said real time clock unit is corrected according to time information carried in said received external synchronization signal having the highest signal strength to provide the precise real time.
  • the user device is a personal computer.
  • the user device is a mobile computer.
  • the user device is an automotive device of a vehicle.
  • the invention further provides a system comprising the features of claim 14.
  • the invention further provides a system comprising transmitters located in different time zones and adapted to transmit synchronization signals on predetermined signal frequencies and user devices each having an integrated circuit with an integrated real time clock unit adapted to provide a precise real time, wherein the integrated circuit of said user device comprises at least one embedded multizone receiver adapted to receive external synchronization signals transmitted on the predetermined signal frequencies, wherein a current real time of said real time clock unit is corrected according to time information carried in said received external synchronization signal having the highest signal strength to provide said precise real time.
  • the invention further provides a method for providing a user device in different time zones with a precise real time comprising the features of claim 15.
  • the invention provides a method for providing a user device In different time zones with a precise real time comprising the steps of:
  • the integrated circuit 1 comprises in the shown implementation different units embedded in an integrated circuit package as shown in Fig. 1 .
  • the integrated circuit 1 comprises an integrated real time clock unit 2 adapted to provide a precise real time PRT which can output at a terminal 3 of the IC package to other components or units of the respective device such as a mobile device.
  • the integrated circuit 1 further comprises at least one embedded multizone receiver 4 adapted to receive external synchronization signals transmitted on predetermined signal frequencies by means of an antenna 5 which can also be embedded in the integrated circuit 1.
  • the at least one antenna 5 of the integrated circuit 1 comprises a ferrite antenna.
  • the ferrite antenna 5 is connected in the shown implementation to an embedded multizone radio receiver 4 of the integrated circuit 1 which is adapted to receive and demodulate received external radio synchronization signals transmitted on predetermined radio signal frequencies.
  • the embedded multizone receiver 4 such as the embedded multizone radio receiver as shown in Fig.1 is powered up by a power management unit 6 of said integrated circuit 1 from a power-up-down sleeping mode to a time correction mode for a predetermined time period in regular time intervals to correct the current real time CRT according to time information carried in the received external synchronization signals received by this embedded multizone receiver 4.
  • a power management unit 6 of said integrated circuit 1 from a power-up-down sleeping mode to a time correction mode for a predetermined time period in regular time intervals to correct the current real time CRT according to time information carried in the received external synchronization signals received by this embedded multizone receiver 4.
  • the real time clock unit 2 of the integrated circuit 1 can be connected to an embedded quartz crystal 7 of the integrated circuit 1 to provide a current real time CRT which may be stored in an internal real time memory or time register of the real time clock unit 2.
  • the current real time CRT stored in the real time memory of the real time clock unit 2 is corrected according to the time information carried in the received external synchronization signal having the highest signal strength when the embedded multizone receiver 4 is powered up by the power management unit 6 to operate in a time correction mode of the integrated circuit 1.
  • the integrated power management unit 6 switches the embedded multizone receiver 4 from a power-down sleeping mode for a predetermined time period sad as 60 sacs to said power-up time correction mode in response to an embedded signal received by the real time clock unit 2 in regular time intervals determined on the basis of the current real time CRT updated in the real time memory of the real time clock unit 2 on the basis of an oscillation signal generated by the quartz crystal 7.
  • the integrated circuit 1 further comprises an embedded battery 8 which supplies said real time clock unit 2 having a low power consumption permanently with electrical power.
  • the embedded multizone receiver 4 is only supplied with electrical power by the embedded battery 8 when it has been switched by the power management unit 6 in the power-up time correction mode of the integrated circuit 1.
  • the battery 8 can be embedded in the package of the integrated circuit 1.
  • the integrated circuit 1 as shown in Fig. 1 can be used within a user device, in particular in a mobile computer, laptop or in an automotive device of a vehicle such as a car. This mobile device can travel between different time zones. Moreover, the integrated circuit 1 according to the present invention can also be used in not mobile devices such as a personal computer to minimize a time drift of the internal reference time.
  • Fig. 2 shows a block diagram of a possible embodiment of an embedded multizone receiver 4 which is used by the real time clock unit 2 and embedded in an integrated circuit 1.
  • the embedded multizone receiver 4 is in the shown implementation an embedded multizone radio receiver adapted to receive and demodulate received external radio synchronization signals transmitted on predetermined radio signal frequencies.
  • the radio receiver can be connected to antenna 5 such as a ferrite antenna.
  • An RF amplifying stage receives the radio signal and supplies it to an analog mixer connected to an analog local oscillator as shown in Fig. 2 .
  • An IF amplifier and filter can be provided receiving the mixed signal wherein the output of the IF amplifier and filter connected to a decoder.
  • the output of the decoder is connected to a single bit analog-digital converter ADC as shown in Fig. 2 .
  • the ferrite antenna 5 can also be embedded inside the IC package of the integrated circuit 1.
  • the radio receiver 4 is in a possible embodiment kept in a power-down mode and is only powered up or started once a day or week for a few minutes to catch a synchronization signal in a time correction mode.
  • the embedded multizone radio receiver 4 is then powered down again in a power-off state after a predetermined time during after the synchronization signal has been received and extracted.
  • a control of the power-up or power-down of the multizone radio receiver 4 can be performed by the power management unit 6 which can be also embedded in the IC package of the integrated circuit 1.
  • synchronization signals can be transmitted on different frequencies in different multi-time zones. Further different types of modulation can be used and corresponding demodulators can be arranged in the integrated multizone receiver 4 which is formed by a wideband receiver adapted to decode different types of data coding.
  • the embedded radio receiver comprises different input stages adjusted for the most used frequencies for different time zones and these stages can be supplied concurrently with power by the power management unit 6.
  • a GPS receiver stage can be implemented.
  • the power management unit 6 can enable the radio/GPS receiver 4 for some period, for example each day or week for a predetermined time which lasts long enough to allow that the time synchronization signal TSS transmitted in the respective time zone is caught and decoded.
  • the power management unit 6 is enabled by the RTC unit 2 wherein an enable signal EN is applied by the RTC unit 2 to the power management unit 6 as shown in Fig. 1 .
  • the power management unit 6 can scan in a possible implementation the receivers and/or input stages supplying a supply voltage to the respective stages for a short time one by one to each stage until a synchronization signal is caught or all receivers have been scanned by the power management unit 6 as shown in principle in Fig. 3 .
  • the power management unit 6 comprises a power switch control which is adapted to control switches SW1, SW2, SW3, SW4 connected in parallel to a power supply unit, for instance the embedded battery 8 shown in Fig. 1 .
  • a switch is connected to a receiver/input stage connected to receive a synchronization signal in a different time zone or with a different modulation scheme.
  • the different switches SW1 to SW4 are activated and closed consecutively by the power switch control of the power management unit 6 and scanned for different synchronization signals transmitted in the area where the device comprising the integrated circuit 1 is located.
  • the power management unit 6 receives an enable signal from the RTC unit 2 and is activated to perform a consecutive switching of the power supply to the different input stages of the multizone receiver 4.
  • the switch SW1 is closed under the control of the power switch control and activates the receiver or input stage adapted to catch a synchronization signal in a first zone A. After a predetermined time the power switch control activates the next input stage of the multizone receiver 4 to scan for another synchronization signal. Step by step each of the switches SW1 to SW4 are closed under the control of the power switch control of the power management unit 6.
  • one switch for example switch 4 can be connected to a GPS/GALILEO receiver which receives a power supply if switch SW4 is closed.
  • the GPS/GALILEO receiver is adapted to extract time information carried in a received GPS signal.
  • the integrated circuit 1 shown in Fig. 1 has a multizone radio receiver 4 as shown in Fig.
  • the integrated circuit IC can be provided within a user device such as a personal computer or a mobile computer. This user device can move between different locations and different time zones. Each time zone having one transmitter can be provided adapted to transmit synchronization signals on predetermined signal frequencies. Accordingly, the invention provides a system having transmitters located in different time zones adapted to transmit synchronization signals on predetermined signal frequencies as well as user devices each having an integrated circuit 1 with an integrated RTC unit 2 as shown in Fig. 1 .
  • the invention further provides a method for providing a user device in different time zones with a precise real time, PRT, comprising the steps as shown in the flow chart of Fig. 4 .
  • a precise real time for each time zone can be generated by a precise clock unit of the respective time zone.
  • This precise real time, PRT can be transmitted in a synchronization signal of the respective time zone on a predetermined signal frequency in step S2.
  • step S3 a current real time, CRT, of a user device is corrected according to the received precise real time, PRT, carried in the synchronization signal received by said user device and having the highest signal strength.
  • the RTC unit 2 has the advantage that it frees the main system of the device from time-critical tasks.
  • the quartz crystal 7 can be embedded inside the chip package as shown in Fig. 1 .
  • the antenna 5 can be embedded in the IC package.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
EP12184873.3A 2012-09-18 2012-09-18 Circuit intégré d'horloge à temps réel Active EP2708962B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12184873.3A EP2708962B1 (fr) 2012-09-18 2012-09-18 Circuit intégré d'horloge à temps réel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12184873.3A EP2708962B1 (fr) 2012-09-18 2012-09-18 Circuit intégré d'horloge à temps réel

Publications (2)

Publication Number Publication Date
EP2708962A1 true EP2708962A1 (fr) 2014-03-19
EP2708962B1 EP2708962B1 (fr) 2017-08-16

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ID=47146158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12184873.3A Active EP2708962B1 (fr) 2012-09-18 2012-09-18 Circuit intégré d'horloge à temps réel

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EP (1) EP2708962B1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2073081A1 (fr) * 2007-12-19 2009-06-24 Seiko Epson Corporation Dispositif garde-temps et procédé de réception de signaux satellites pour un dispositif garde-temps
EP2161633A2 (fr) * 2008-09-04 2010-03-10 Seiko Epson Corporation Horloge électronique
WO2011004214A1 (fr) * 2009-07-07 2011-01-13 Council Of Scientific & Industrial Research Récepteur teleclock amélioré utilisant un réseau de téléphone mobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2073081A1 (fr) * 2007-12-19 2009-06-24 Seiko Epson Corporation Dispositif garde-temps et procédé de réception de signaux satellites pour un dispositif garde-temps
EP2161633A2 (fr) * 2008-09-04 2010-03-10 Seiko Epson Corporation Horloge électronique
WO2011004214A1 (fr) * 2009-07-07 2011-01-13 Council Of Scientific & Industrial Research Récepteur teleclock amélioré utilisant un réseau de téléphone mobile

Also Published As

Publication number Publication date
EP2708962B1 (fr) 2017-08-16

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