Real time clock device for vehicle and operating method thereof

Patent metadata

Field	Value
Publication number	US-11429140-B2
Application number	US-201916687990-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Nov 20, 2018
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A real time clock device for a vehicle may include: a register set provided with a first register, in which second time information is stored, and configured to store Real Time Clock (RTC) data including the time or date; and a data compensation circuit to block an input of a 1 second (1 s) tick to the first register and compensate for a delay time according to the block of the input of the 1 s tick to the first register by an RTC lock signal during a process of transmitting the RTC data to an external device or receiving setting data for the RTC data from the external device.

First claim

What is claimed is:

1. A real time clock device for a vehicle, comprising:
a register set provided with a first register, in which second time information is stored,
and configured to store Real Time Clock (RTC) data including time or date; and
a data compensation circuit configured to block an input of a 1 second (1s) tick to the first register and compensate for a delay time based on the block of the input of the 1 s tick to the first register by an RTC lock signal during a process of transmitting the RTC data to an external device or receiving setting data for the RTC data from the external device.

2. The real time clock device of claim 1 , wherein the RTC lock signal is set by the external device.

3. The real time clock device of claim 2 , wherein when there is no setting of the RTC lock signal by the external device, a normal operation of the register set is performed by the 1 s tick.

4. The real time clock device of claim 1 , wherein the data compensation circuit includes a 1 s tick generator configured to receive a clock from an outside and generate the 1 s tick.

5. The real time clock device of claim 4 , wherein the data compensation circuit further includes a 1 s tick register configured to store a result of a calculation of the 1 s tick and the RTC lock signal.

6. The real time clock device of claim 5 , wherein the data compensation circuit further includes a 1 s tick counter configured to count a 1 s tick based on a value stored in the 1 s tick register.

7. The real time clock device of claim 6 , wherein the data compensation circuit further includes a flag register configured to store an error flag when a 1 s tick occurs twice as a result of the 1 s tick counter.

8. The real time clock device of claim 5 , further comprising:
a selector configured to select at least one of a value stored in the 1 s tick register or a value corresponding to a ground voltage in response to the RTC lock signal.

9. The real time clock device of claim 8 , wherein the selector is activated when the RTC lock signal is detected.

10. The real time clock device of claim 9 , wherein the data compensation circuit further includes an edge detector configured to detect a falling edge of the RTC lock signal and provide the selector with a detected signal.

11. The real time clock device of claim 1 , wherein the data compensation circuit further includes a first logic circuit configured to perform an AND operation on the 1 s tick and an inverted signal of the RTC lock signal, and
a setting of the first register is changed based on a result value of the first logic circuit.

12. The real time clock device of claim 1 , wherein the data compensation circuit further includes a second logic circuit configured to perform an AND operation on the 1 s tick and the RTC lock signal, and
a result value of the second logic circuit is stored in a 1 s tick register.

13. The real time clock device of claim 1 , wherein when the 1 s tick occurs once while the RTC lock signal is set, the data compensation circuit is configured to perform a one-second compensation on the first register when the RTC lock signal is released.

14. The real time clock device of claim 1 , wherein when the 1 s tick occurs twice while the RTC lock signal is set, the data compensation circuit is configured to perform a two-second compensation on the first register when the RTC lock signal is released and generate an error flag.

15. A method of operating a real time clock device for a vehicle, the method comprising:
receiving, by the real time clock device, a request for transmission or reception of Real Time Clock (RTC) data from an external device;
receiving an RTC lock signal from the external device; and
compensating for the RTC data by using the RTC lock signal and a one second (1 s) tick,
wherein the compensating for the RTC data includes blocking an input of the 1 s tick to the first register and compensating for a delay time based on the block of the input of the 1 s tick to the first register.

16. The method of claim 15 , wherein the compensating for the RTC data further includes generating the 1 s tick.

17. The method of claim 15 , wherein the compensating for the RTC data further includes calculating the 1 s tick and the RTC lock signal.

18. The method of claim 17 , wherein the calculating the 1 s tick and the RTC lock signal includes:
performing a first AND operation on the 1 s tick and an inverted signal of the RTC lock signal; and
performing a second AND operation on the 1 s tick and the RTC lock signal.

19. The method of claim 18 , further comprising:
increasing one second in the RTC data based on a result value of the first AND operation.

20. The method of claim 18 , further comprising:
increasing one second in the RTC data by using a result value of the second AND operation and a detected signal of the RTC lock signal.

Assignees

• Hyundai Autron Co Ltd
• Hyundai Mobis Co Ltd

Inventors

• Jang Dong On
• Kim Young Suk
• Park Hyung Min
• Lee Ji Haeng
• Jang Doo Jin
• Jo Won Hee

Classifications

• G04G3/00

  Producing timing pulses (driving circuits for stepping motors G04C3/14; producing preselected time intervals for use as timing standards G04F5/00; pulse technique in general H03K; control, synchronisation, or stabilisation of generators in general H03L) · CPC title

• G05B19/0423 Primary

  Input/output · CPC title

• G04G5/02 Primary

  by temporarily changing the number of pulses per unit time, e.g. quick-feed method · CPC title

• G06F1/14 Primary

  Time supervision arrangements, e.g. real time clock · CPC title

• G05B2219/24215

  Scada supervisory control and data acquisition · CPC title