Radio frequency communication device

Patent metadata

Field	Value
Publication number	US-11037435-B2
Application number	US-201916687491-A
Country	US
Kind code	B2
Filing date	Nov 18, 2019
Priority date	Nov 18, 2019
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A communication device includes a main controller configured to control an RF communication of the communication device, and an antenna coupled to the main controller and driven by the main controller with modulated carrier signal. The communication device includes a detector coupled to the main controller and configured to detect a presence of an external communication device and to initiate a wake-up of the main controller in response to the detection. The communication device further includes one or more temperature sensors coupled to the detector and configured to detect temperature information of external or nearby circuits of the communication device. The detector is configured not to initiate the wake-up of the main controller if a difference between a first temperature measurement and a second temperature measurement is above a first temperature threshold or below a second temperature threshold.

First claim

What is claimed is:

1. A communication device comprising:
a main controller configured to control an RF communication of the communication device;
an antenna coupled to said main controller and driven by said main controller with modulated carrier signal;
a detector coupled to said main controller and configured to detect a presence of an external communication device and to initiate a wake-up of said main controller in response to said detection; and
one or more temperature sensors coupled to said detector and configured to detect temperature information of external or nearby circuits of the communication device;
wherein the detector is configured to detect said presence by detecting a load on an RF interface of the communication device;
wherein the detector is configured not to initiate said wake-up of said main controller if a difference between a first temperature measurement and a second temperature measurement is above a first temperature threshold or below a second temperature threshold; and
wherein the detector is configured to initiate said wake-up of said main controller if a difference between said load and a reference load is above a detection threshold and said difference between said first temperature measurement and said second temperature measurement is less than said first temperature threshold and greater than said second temperature threshold;
wherein the detector is configured not to initiate said wake-up of said main controller includes increasing said detection threshold by a first scaling factor if said difference between said first temperature measurement and said second temperature measurement is above said first temperature threshold.

2. The communication device of claim 1 , wherein the detector is configured not to initiate said wake-up of said main controller includes increasing said detection threshold by a second scaling factor if said difference between said first temperature measurement and said second temperature measurement is below said second temperature threshold.

3. The communication device of claim 1 , further comprising a non-volatile random-access memory (NVRAM) or a flash memory for storing one or more configuration parameters.

4. The communication device of claim 1 , wherein the detector is configured not to initiate said wake-up of said main controller includes detecting a strong temperature increase event if said difference between said first temperature measurement and said second temperature measurement is above said first temperature threshold.

5. The communication device of claim 1 , wherein the detector is configured not to initiate said wake-up of said main controller includes detecting a strong temperature decrease event if said difference between said first temperature measurement and said second temperature measurement is below said second temperature threshold.

6. The communication device of claim 1 , wherein said communication device is a near field communication, (NFC) device, a radio frequency identification (RFID) device, a mobile device, or a wearable device.

7. The communication device of claim 1 , wherein the first temperature threshold is a positive value, and the second temperature threshold is a negative value.

8. A method comprising:
detecting a load on an RF interface of a communication device;
detecting temperature information of external or nearby circuits of the communication device;
determining whether to initiate a wake-up of a main controller of the communication device in response to said detecting said load and said temperature information;
preventing said wake-up of said main controller if a difference between a first temperature measurement and a second temperature measurement is above a first temperature threshold or below a second temperature threshold; and
initiating said wake-up of said main controller if a difference between said load and a reference load is above a detection threshold and said difference between said first temperature measurement and said second temperature measurement is less than said first temperature threshold and greater than said second temperature threshold;
wherein preventing initiating said wake-up of said main controller includes increasing said detection threshold by a first scaling factor if said difference between said first temperature measurement and said second temperature measurement is above said first temperature threshold.

9. The method of claim 8 , wherein preventing initiating said wake-up of said main controller includes increasing said detection threshold by a second scaling factor if said difference between said first temperature measurement and said second temperature measurement is below said second temperature threshold.

10. The method of claim 8 , wherein detecting temperature information of external or nearby circuits of the communication device includes detecting a strong temperature increase event if said difference between said first temperature measurement and said second temperature measurement is above said first temperature threshold.

11. The method of claim 8 , wherein detecting temperature information of external or nearby circuits of the communication device includes detecting a strong temperature decrease event if said difference between said first temperature measurement and said second temperature measurement is below said second temperature threshold.

12. The method of claim 8 , further comprising setting the first temperature threshold to a positive value and the second temperature threshold to a negative value.

13. A communication device comprising:
a main controller configured to control an RF communication of the communication device;
an antenna coupled to said main controller and driven by said main controller with modulated carrier signal;
a detector coupled to said main controller and configured to detect a presence of an external communication device and to initiate a wake-up of said main controller in response to said detection;
one or more temperature sensors configured to detect temperature information of external or nearby circuits of the communication device; and
a temperature compensation tracking module coupled to said one or more temperature sensors and configured to determine an error caused by a temperature change in response to said temperature information;
wherein the detector is configured to detect said presence by detecting a first load on an RF interface of the communication device and deriving a second load by subtracting said error from said first load; and
wherein the detector is configured to initiate said wake-up of said main controller if a difference between said second load and a reference is above a detection threshold.

14. The communication device of claim 13 , wherein said temperature compensation tracking module is configured to predict said error based on a difference between a first temperature measurement at a first time instant and a second temperature measurement at a second time instant and one or more configuration parameters.

15. The communication device of claim 14 , further comprising a non-volatile random-access memory (NVRAM) for storing said one or more configuration parameters.

16. The communication device of claim 13 , wherein said detector is configured to control said temperature compensation tracking module.

17. The communication device of claim 13 , wherein said temperature compensation tracking module is configured to determine an error caused by a temperature change includes said temperature compensation tracking module determining an error caused by a strong temper

Assignees

• Nxp Bv

Inventors

• Wobak Markus
• Tretnjak Stefan

Classifications

• H04L12/12

  Arrangements for remote connection or disconnection of substations or of equipment thereof · CPC title

• G08B29/185 Primary

  Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system · CPC title

• G08B21/182

  Level alarms, e.g. alarms responsive to variables exceeding a threshold · CPC title

• H04Q2209/47

  using RFID associated with sensors · CPC title

• H04Q9/00 Primary

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title