EP2708962B1 - An integrated real time clock circuit - Google Patents
An integrated real time clock circuit Download PDFInfo
- Publication number
- EP2708962B1 EP2708962B1 EP12184873.3A EP12184873A EP2708962B1 EP 2708962 B1 EP2708962 B1 EP 2708962B1 EP 12184873 A EP12184873 A EP 12184873A EP 2708962 B1 EP2708962 B1 EP 2708962B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- integrated circuit
- embedded
- real time
- time
- power
- 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.)
- Active
Links
- 239000013078 crystal Substances 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
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
Description
- 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.
- In many applications it is necessary to provide a precise real time PRT for a device, in particular for a mobile device which may be transported between different time zones.
- 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.
- Conventional devices having conventional integrated real time clock units can use precise quartz crystals which are normally embedded inside a chip package of the respective chip. However even for a precise quartz crystal which can be even temperature compensated during continuous use of the respective device normally a time drift is observed. In many cases the observed time drift can be substantial In some cases the time drift may be more than 10 minutes during a time period of a few months of operation of the respective device. A further disadvantage is when the mobile device comprising the real time clock unit is transported between different time zones, the user of the mobile device has always to adjust the system time of the device corresponding to the current time of the momentary location or time zone. Moreover, if the change of summer to wintertime and reverse is not supported by a software implemented in the respective device further adjustment has to be performed by a user of the mobile device.
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EP 2 161 633 A2 discloses an integrated circuit, referenced as 30, embedding a Real Time Clock unit and a multi-channel GPS receiver. Synchronization signals are received, during predetermined time intervals, from several GPS satellites and the RTC contents are updated based on the time contents of the synchronization signal having the highest signal strength. - Accordingly, it is 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.
- This object is achieved by an integrated circuit comprising the features of
claim 1. - In a possible embodiment of the integrated circuit according to the present invention the embedded multizone radio receiver of said integrated circuit is connected to at least one antenna of said integrated circuit to receive said external synchronization signals.
- In a further possible embodiment of the integrated circuit according to the present invention the at least one antenna of said integrated circuit comprises a ferrite antenna.
- In a still further embodiment of the integrated circuit according to the present invention 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.
- In a possible embodiment of the integrated circuit according to the present invention 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. In a further possible embodiment of the integrated circuit according to the present invention the integrated power management unit switches said embedded multizone radio 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.
- In a further possible embodiment of the integrated circuit according to the present invention 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.
- In a further possible embodiment of the integrated circuit according to the present invention the battery is embedded in a package of said integrated circuit.
- In a possible embodiment of the integrated circuit according to the present invention said integrated circuit further comprises 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 as defined above. In a possible embodiment of the user device according to the present invention the user device is a personal computer.
- In a further possible embodiment of the present invention the user device is a mobile computer.
- In a still further embodiment of the user device according to the present invention the user device is an automotive device of a vehicle.
- The invention further provides a system comprising the features of
claim 14. Accordingly, 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 as defined above. In the following possible embodiments of the integrated circuit having an integrated real time clock unit are explained in more detail with reference to the enclosed figures. - Fig. 1
- shows a block diagram of a possible embodiment of the integrated circuit in an integrated real time clock unit according to the present invention;
- Fig. 2
- shows a block diagram of a possible implementation of a radio receiver provided in the integrated circuit of the present invention;
- Fig. 3
- shows a diagram for illustrating a possible implementation of a power management unit according to a possible embodiment of the integrated circuit according to the present invention.
- As can be seen in
Fig. 1 theintegrated circuit 1 according to the present invention comprises in the shown implementation different units embedded in an integrated circuit package as shown inFig. 1 . In the shown implementation theintegrated circuit 1 comprises an integrated real time clock unit 2 adapted to provide a precise real time PRT which can output at aterminal 3 of the IC package to other components or units of the respective device such as a mobile device. The integratedcircuit 1 further comprises at least one embeddedmultizone 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 integratedcircuit 1. In the shown implementation ofFig. 1 the at least one antenna 5 of the integratedcircuit 1 comprises a ferrite antenna. The ferrite antenna 5 is connected in the shown implementation to an embeddedmultizone radio receiver 4 of the integratedcircuit 1 which is adapted to receive and demodulate received external radio synchronization signals transmitted on predetermined radio signal frequencies. The embeddedmultizone receiver 4 such as the embedded multizone radio receiver as shown inFig.1 is powered up by apower management unit 6 of said integratedcircuit 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 embeddedmultizone receiver 4. In a possible embodiment such as in the implementation shown inFig. 1 the real time clock unit 2 of theintegrated circuit 1 can be connected to an embedded quartz crystal 7 of the integratedcircuit 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 embeddedmultizone receiver 4 is powered up by thepower management unit 6 to operate in a time correction mode of the integratedcircuit 1. In a possible embodiment the integratedpower management unit 6 switches the embeddedmultizone 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. - In a possible embodiment such as in the implementation shown in
Fig. 1 the integratedcircuit 1 further comprises an embedded battery 8 which supplies said real time clock unit 2 having a low power consumption permanently with electrical power. In contrast, the embeddedmultizone receiver 4 is only supplied with electrical power by the embedded battery 8 when it has been switched by thepower management unit 6 in the power-up time correction mode of the integratedcircuit 1. The battery 8 can be embedded in the package of the integratedcircuit 1. - The integrated
circuit 1 as shown inFig. 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 integratedcircuit 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 embeddedmultizone receiver 4 which is used by the real time clock unit 2 and embedded in an integratedcircuit 1. The embeddedmultizone 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 inFig. 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 inFig. 2 . - In a possible embodiment the ferrite antenna 5 can also be embedded inside the IC package of the integrated
circuit 1. To keep the power consumption of the integratedcircuit 1 low theradio 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 embeddedmultizone 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 themultizone radio receiver 4 can be performed by thepower management unit 6 which can be also embedded in the IC package of the integratedcircuit 1. - Since 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. In a possible embodiment 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 thepower management unit 6. In a possible implementation also a GPS receiver stage can be implemented. - To save battery power supplied by the embedded battery 8 such as a lithium battery, 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. In a possible embodiment thepower management unit 6 is enabled by the RTC unit 2 wherein an enable signal EN is applied by the RTC unit 2 to thepower management unit 6 as shown inFig. 1 . When a multizone function is implemented thepower 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 thepower management unit 6 as shown in principle inFig. 3 . - In the shown implementation 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 inFig. 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 thepower management unit 6 and scanned for different synchronization signals transmitted in the area where the device comprising theintegrated circuit 1 is located. In the shown implementation thepower 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 themultizone 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 thepower management unit 6. In a possible implementation one switch, forexample 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. Theintegrated circuit 1 shown inFig. 1 has amultizone radio receiver 4 as shown inFig. 2 and an embeddedpower management unit 6 as shown inFig. 3 . 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 anintegrated circuit 1 with an integrated RTC unit 2 as shown inFig. 1 . - 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 . Also the antenna 5 can be embedded in the IC package.
Claims (13)
- An integrated circuit, IC, (1) comprising an integrated Real Time Clock, RTC, unit (2) adapted to provide a precise real time (PRT), said integrated circuit (1) comprising
at least one embedded multizone radio receiver (4) adapted to receive and demodulate received external radio synchronization signals transmitted on predetermined radio signal frequencies from transmitters located in different time zones,
wherein the integrated circuit is adapted to correct a current real time (CRT) of said RTC unit (2) according to time information carried in said received external synchronization signal having the highest signal strength to provide said precise real time (PRT),
wherein said integrated circuit comprises a power management unit (6) adapted to power-up said embedded multizone radio receiver (4) of said integrated circuit (1) from a power-down sleeping mode to a time correction mode for a predetermined time period in regular time intervals to catch a synchronization signal and to correct the current real time (CRT) according to the time information carried in said received external radio synchronization signals. - The integrated circuit according to claim 1,
wherein the embedded multizone radio receiver (4) of said integrated circuit (1) is powered down again in a power-off state, after a predetermined time after the synchronization signal has been received and extracted. - The integrated circuit according to one of the preceding claims 1 or 2,
wherein said embedded multizone radio receiver (4) of said integrated circuit (1) is connected to at least one antenna (5) of said integrated circuit (1) to receive said external synchronization signals. - The integrated circuit according to claim 3,
wherein said at least one antenna (5) of said integrated circuit (1) comprises a ferrite antenna (5). - The integrated circuit according to one of the preceding claims 1 - 4,
wherein said RTC Unit (2) of said integrated circuit (1) is connected to an embedded quartz crystal (7) of said integrated circuit (1) to provide a current real time (CRT) stored in a real time memory of said RTC unit (2). - The integrated circuit according to claim 5,
wherein the current real time (CRT) stored in said real time memory of said RTC unit (2) is updated according to time information carried in the received external synchronization signal having the highest signal strength when said embedded multizone radio receiver (4) is powered up by said power management unit (6) to operate in said time correction mode. - The integrated circuit according to claim 6,
wherein said integrated power management unit (6) switches said embedded multizone radio receiver (4) 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 RTC unit (2) in regular time intervals determined on the basis of the current real time (CRT) provided in said real time memory of said RTC unit (2). - The integrated circuit according to one of the preceding claims 1 - 7,
wherein said integrated circuit (1) comprises a battery (8) which supplies said RTC unit (2) having a low power consumption permanently with electrical power and said embedded multizone radio receiver (4) when it has been switched by said power management unit (6) into said power-up time correction mode. - The integrated circuit according to claim 8,
wherein said battery (8) is embedded in a package of said integrated circuit (1). - The integrated circuit according to claim 1,
wherein said integrated circuit (1) further comprises an embedded GPS/GALILEO receiver adapted to extract time information carried in a received GPS signal. - A user device comprising an integrated circuit (1) with an integrated RTC unit (2) according to any of the preceding claims 1-10.
- A user device according to claim 11,
wherein said user device comprises
a personal computer or
a mobile computer or
an automotive device. - 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 RTC unit (2) according to one of the preceding claims 1 - 12.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP12184873.3A EP2708962B1 (en) | 2012-09-18 | 2012-09-18 | An integrated real time clock circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP12184873.3A EP2708962B1 (en) | 2012-09-18 | 2012-09-18 | An integrated real time clock circuit |
Publications (2)
Publication Number | Publication Date |
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EP2708962A1 EP2708962A1 (en) | 2014-03-19 |
EP2708962B1 true EP2708962B1 (en) | 2017-08-16 |
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EP12184873.3A Active EP2708962B1 (en) | 2012-09-18 | 2012-09-18 | An integrated real time clock circuit |
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US8116170B2 (en) * | 2007-12-19 | 2012-02-14 | Seiko Epson Corporation | Timekeeping device and satellite signal reception method for a timekeeping device |
JP5251372B2 (en) * | 2008-09-04 | 2013-07-31 | セイコーエプソン株式会社 | Electronic clock |
WO2011004214A1 (en) * | 2009-07-07 | 2011-01-13 | Council Of Scientific & Industrial Research | Improved teleclock receiver utilizing mobile telephone network |
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