# US 2026/0101286 A1 · Near field communication device and operating method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0101286 A1 - Document ID: US20260101286A1 - Status: Published application - Kind: A1 - Application number: 19/343,321 - Filed: 2025-09-29 - Published: 2026-04-09 - Earliest claimed: 2024-10-04 - Assignees: NXP B.V. - Applicants: NXP B.V. - Inventors: Mark Feichtinger; Ulrich Andreas Muehlmann; Markus Wobak - Web page: https://patentgrep.com/patent/US20260101286A1 ## CPC - H04B 5/00: Near-field transmission systems, e.g. inductive or capacitive transmission systems - H04W 52/0251: {using monitoring of local events, e.g. events related to user activity} - H04L 43/0876: Network utilisation, e.g. volume of load or congestion level - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 52/0235: {where the received signal is a power saving command} - H04W 52/028: {switching on or off only a part of the equipment circuit blocks} - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: a wake-up unit configured to: transmit one or more radio frequency, RF, pulses; detect a loading condition change occurring in response to transmitting the RF pulses; wake up one or more functional components of the NFC device if the loading condition change exceeds a predefined wake-up threshold; and a calibration state determination unit configured to determine a calibration state of the wake-up unit by detecting whether the loading condition change is within a predefined range below the wake-up threshold. In accordance with a second aspect of the present disclosure, a corresponding method of operating an NFC device is conceived. ## Claims ### Claim at position 1 -15. (canceled) ### Claim 16 A near field communication (NFC) device comprising: a wake-up unit configured to: transmit one or more radio frequency (RF) pulses; detect a loading condition change occurring in response to transmitting the one or more RF pulses; wake up one or more functional components of the NFC device if the loading condition change exceeds a predefined wake-up threshold; and a calibration state determination unit configured to determine a calibration state of the wake-up unit by detecting whether the loading condition change is within a predefined range below the predefined wake-up threshold. ### Claim 17 (depends on 16) The NFC device of claim 16, wherein the calibration state determination unit is further configured to: increment a counter indicative of a number of times that the loading condition change is within the predefined range; and determine that the calibration of the wake-up unit is outdated if the counter exceeds a predefined counter threshold. ### Claim 18 (depends on 17) The NFC device of claim 17, wherein the calibration state determination unit is configured to reset the counter if the wake-up unit has woken up the functional components and communication has been established with an external communication counterpart. ### Claim 19 (depends on 17) The NFC device of claim 17, wherein the calibration state determination unit is configured to subtract a configurable number from the counter if the wake-up unit has woken up the functional components and no communication has been established with an external communication counterpart after a predefined amount of time. ### Claim 20 (depends on 17) The NFC device of claim 17, wherein the calibration state determination unit is further configured to initiate a recalibration of the wake-up unit if it has determined that the calibration of the predefined wake-up unit is outdated. ### Claim 21 (depends on 20) The NFC device of claim 20, wherein the calibration state determination unit is configured to reset the counter upon or after initiating the recalibration of the wake-up unit. ### Claim 22 (depends on 16) The NFC device of claim 16, wherein the calibration state determination unit is configured to detect that the loading condition change is within the predefined range if the loading condition change is greater than a low threshold and smaller than a high threshold, the low threshold and high threshold being smaller than the predefined wake-up threshold. ### Claim 23 (depends on 16) The NFC device of claim 16, wherein the loading condition change comprises a change of a magnitude of an output signal of an analog-to-digital converter (ADC) comprised in the NFC device. ### Claim 24 (depends on 16) The NFC device of claim 16, being implemented as a wireless charging poller (WLC-P). ### Claim 25 A method of operating a near field communication (NFC) device, the method comprising: transmitting, by a wake-up unit included in the NFC device, one or more radio frequency (RF) pulses; detecting, by the wake-up unit, a loading condition change occurring in response to transmitting the one or more RF pulses; waking up, by the wake-up unit, one or more functional components of the NFC device if the loading condition change exceeds a predefined wake-up threshold; and determining, by a calibration state determination unit included in the NFC device, a calibration state of the wake-up unit by detecting whether the loading condition change is within a predefined range below the predefined wake-up threshold. ### Claim 26 (depends on 25) The method of claim 25, further comprising: incrementing, by the calibration state determination unit, a counter indicative of a number of times that the loading condition change is within the predefined range; and determining, by the calibration state determination unit, that the calibration of the wake-up unit is outdated if the counter exceeds a predefined counter threshold. ### Claim 27 (depends on 26) The method of claim 26, wherein, if the wake-up unit has woken up the functional components and communication has been established with an external communication counterpart, the method further comprises resetting, by the calibration state determination unit, the counter. ### Claim 28 (depends on 26) The method of claim 26, wherein the calibration state determination unit subtracts a configurable number from the counter if the wake-up unit has woken up the functional components and no communication has been established with an external communication counterpart after a predefined amount of time. ### Claim 29 (depends on 26) The method of claim 26, wherein, in response to determining the calibration of the wake-up unit is outdated, the method further comprises initiating, by the calibration state determination unit, a recalibration of the wake-up unit. ### Claim 30 (depends on 29) The method of claim 29, further comprising resetting, by the calibration state determination unit, the counter upon or after initiating the recalibration of the wake-up unit. ### Claim 31 (depends on 25) The method of claim 25, further comprising detecting, by the calibration state determination unit, that the loading condition change is within the predefined range if the loading condition change is greater than a low threshold and smaller than a high threshold, the low threshold and high threshold being smaller than the predefined wake-up threshold. ### Claim 32 (depends on 25) The method of claim 25, wherein the loading condition change comprises a change of the magnitude of an output signal of an analog-to-digital converter (ADC) comprised in the NFC device. ### Claim 33 (depends on 25) The method of claim 25, wherein the NFC device is implemented as a wireless charging poller (WLC-P).