Electronic device and method for operating the electronic device

Abstract

Embodiments of the present disclosure relate to radio frequency identification and Qi wireless power devices. A device including a frequency demodulator and an amplitude demodulator is provided. The device is configured to use the frequency demodulator and the amplitude demodulator in parallel in a first mode, and activate a radio frequency identification (RFID) card mode or a Qi charger mode based on the result provided by the demodulator.

Description

Technical Field

[0001] The present disclosure relates generally to electronic devices, and more particularly to electronic devices integrating RFID (Radio Frequency Identification) technology. Background Art

[0002] Contactless technology is very widespread and is used extensively in transport and access control applications. The current trend is to group as many functions (traditionally carried by contactless cards or IC cards) as possible onto a single device, such as a mobile phone. Summary of the invention

[0003] There is a need for improved contactless access devices, particularly access devices equipped with RFID technology.

[0004] One embodiment provides a device including a frequency demodulator and an amplitude demodulator, the device being configured to use the two demodulators in parallel in a first mode and to activate an RFID card mode or a Qi charger mode based on results provided by the demodulators.

[0005] One embodiment provides a method implemented by an apparatus including a frequency demodulator and an amplitude demodulator, wherein the apparatus uses the two demodulators in parallel in a first mode and uses the two demodulators serially in a second mode.

[0006] According to an embodiment, both the frequency demodulator and the amplitude demodulator further comprise a load modulator / demodulator.

[0007] According to one embodiment, in the second mode, both the frequency demodulator and the amplitude demodulator operate continuously.

[0008] According to one embodiment, the load modulator of the apparatus is used when the apparatus communicates with an external RFID type device configured in reader mode.

[0009] According to one embodiment, the load modulator is used when the device is charged by an external device and when the device emulates an RFID card configured as Type A.

[0010] According to an embodiment, when the apparatus is in the second mode, the Qi analog front end of the apparatus is adapted to FM or AM data, FM data is used to communicate with a Qi charger device, AM data is used to communicate with an RFID device configured in card mode.

[0011] According to one embodiment, an amplitude demodulator is used to demodulate the response of an external Type A device configured in card mode in load modulation.

[0012] According to an embodiment, the amplitude demodulator is used to demodulate commands received from an external device configured in a reader mode.

[0013] According to an embodiment, a frequency demodulator is used to demodulate a response received from an external Type B device configured in card mode.

[0014] According to an embodiment, a frequency demodulator is used to demodulate a digital ping or any subsequent data packets received from an external charging device.

[0015] According to an embodiment, a frequency demodulator is used to demodulate a response received from an external chargeable device.

[0016] According to one embodiment, when an external field is detected on the antenna, it is checked whether the field comes from an RFID device or from a Qi device.

[0017] According to an embodiment, the check is performed by transmitting periodic interrogation frames in both RFID mode and Qi mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above features and advantages and others will be described in detail in the following description of specific embodiments given by way of illustration and not limitation with reference to the accompanying drawings, in which:

[0019] Figure 1 An example of a communication system including a device of Qi technology is schematically shown, to which the embodiments are applicable as an example;

[0020] Figure 2 Shows Figure 1 a timing diagram of the operating modes of the device shown;

[0021] Figure 3 shows a flow chart illustrating Figure 2 A portion of the timing diagram shown in;

[0022] Figure 4 Shows Figure 2 An example of a portion of a timing diagram is shown;

[0023] Figure 5 Shows Figure 1 a block diagram of an embodiment of a communication circuit of the illustrated apparatus;

[0024] Figure 6 Shows Figure 5 A first operation example of the circuit shown;

[0025] Figure 7 Shows Figure 2 Another example of a portion of a timing diagram is shown;

[0026] Figure 8 Shows Figure 5 A second operation example of the circuit shown;

[0027] Fig. 9 Shows Figure 2 Another example of a portion of a timing diagram is shown;

[0028] Fig.10 Shows Figure 5 A third operation example of the circuit shown;

[0029] Fig.11 Shows Figure 5 A fourth operation example of the illustrated circuit;

[0030] Fig.12 Shows Figure 5 A fifth operation example of the illustrated circuit;

[0031] Fig.13 Shows Figure 5 a sixth operation example of the illustrated circuit; and

[0032] Fig.14 Shows Figure 2 Another example of a portion of the timing diagram is shown. DETAILED DESCRIPTION

[0033] Similar features have been designated by similar reference numerals in the various figures. In particular, common structural and / or functional features in the various embodiments may have the same reference numerals and may have the same structure, dimensions, and material properties.

[0034] For the sake of clarity, only the operations and elements that are helpful for understanding the embodiments described herein are described in detail and described. Specifically, circuits determined according to their respective functions are not described in detail in structure.

[0035] Unless otherwise specified, when reference is made to two elements being connected together, this means a direct connection without any intervening elements other than conductors; when reference is made to two elements being coupled together, this means the two elements may be connected or may be coupled through one or more other elements.

[0036] In the following disclosure, unless otherwise stated, when referring to absolute position qualifiers, such as terms "front", "back", "up", "down", "left", "right", etc., or relative position qualifiers, such as terms "up", "down", "high", "low", etc., or orientation qualifiers, such as "horizontal", "vertical", etc., reference is made to the direction shown in the figure.

[0037] Unless otherwise specified, the expressions "about," "approximately," "substantially," and "in the order of" mean within 10%, preferably within 5%.

[0038] In this specification, it is proposed to take advantage of the fact that Qi technology (corresponding to the standard developed by the Wireless Power Consortium for wireless energy transmission) is widely developed in new smartphones. Qi technology is particularly interesting because it is suitable for frequency bands including low frequencies (LF) (100kHz to 200kHz). Therefore, in this specification, it is sought to establish LF communication through RFID technology by using some components of the circuit dedicated to Qi technology.

[0039] Figure 1 An example of a communication system including devices of Qi technology is schematically shown, as an example, the disclosed embodiments are applicable to Qi technology.

[0040] Figure 1 The system 11 shown in FIG. 1 comprises an electronic device 13 adapted to communicate with other electronic devices / apparatuses using Qi technology and RFID technology.

[0041] According to one embodiment, the device 13 is a mobile phone, such as a smartphone or a tablet computer.

[0042] according to Figure 1 In the embodiment shown, the device 13 is adapted to be charged by the Qi charger platform 15 (chargeable mode), or to be adapted to charge another electronic device 17 equipped with Qi technology (charger mode). In other words, the device 13 is adapted to adjust according to its external environment to switch from charger mode to rechargeable mode. The device 13 can then operate in charger mode and charge devices in its environment, or operate in rechargeable mode and be charged by a charger device in its environment.

[0043] according to Figure 1 In the embodiment shown, the device 13 is also adapted to communicate with RFID devices configured in card mode 19 and RFID devices configured in reader mode 21. In other words, the device 13 is adapted to adjust according to its external environment to switch from reader mode to card mode. The device 13 can then operate in reader mode and communicate with devices in card mode present in its environment, or operate in card mode and communicate with devices in reader mode present in its environment.

[0044] According to an application example, the embodiments are applicable to transportation systems and access control, for example, to doors of buildings equipped with low frequency (LF) technology.

[0045] Figure 2 is a timing diagram illustrating Figure 1 The operating mode of the device shown.

[0046] when Figure 1 When the device 13 is not communicating, it is shown in a low power mode or standby state to reduce power consumption.

[0047] When the device 13 is in the standby state, it should still be able to detect the presence of an RFID reader, RFID card, rechargeable device or charger device.

[0048] Figure 2 The timing diagram shown in comprises two consecutive parts I and II, part I corresponding to the operation when the device 13 is in the standby mode and part II corresponding to the operation when the device 13 is in a normal mode called the polling mode.

[0049] according to Figure 2 In the embodiment shown, when the device 13 is in standby mode (part I), it "probes" its environment by emitting pulses 23 of short period. For example, two pulses 23 are separated by a time interval 25. The pulses 23 correspond to short field emissions of the device 13 to detect a possible device configured in card mode or a rechargeable device present in the field of the device 13. In the case of detecting such a device, the device 13 then wakes up from the standby state and switches to normal mode (part II). This detection enables the analysis of electrical quantities (for example amplitude or phase) specific to these pulses 23, which would change if a device configured in card mode or a rechargeable device were nearby.

[0050] During interval 25, device 13 is in listener mode for devices in reader mode or charger devices within range.

[0051] Figure 3 is a flow chart illustrating Figure 2 A portion of the sequence diagram shown. More precisely, the flow chart corresponds to an implementation example of the Listener pattern.

[0052] If the device 13 detects a field (block 61, Field Detected), the device activates by exiting standby mode (block 63, Entering Active Mode) and responds to the reader or charger device depending on the detected technology.

[0053] More precisely, the device 13 comprises two demodulators, one suitable for demodulating On-Off Keying (OOK) modulation and the other suitable for demodulating Frequency Shift Keying (FSK) modulation. When both demodulators are activated, the device 13 is in normal mode (block 65, activating OOK and FSK demodulators).

[0054] In response to a reader or charger device, the device 13 detects the technology of the device within range and more precisely the type of modulation it is based on. Thus, the device 13 detects On-Off Keying (OOK) modulation (block 67, OOK detected) or Frequency Shift Keying (FSK) modulation (block 73, FSK detected).

[0055] The response of device 13 is appropriate to the type of modulation detected by the device.

[0056] If, in addition to OOK modulation, type A is detected based on the frame start, the device 13 responds by sending a reply with load modulation according to the RFID standard (block 69, Type A detected based on frame start: send reply with load modulation according to the RFID standard).

[0057] If, in addition to OOK modulation, type B is detected based on the start of the frame, the device 13 also responds by turning on the field after field off detection and modulating the reply according to the RFID standard using FSK (box 71, type B detected based on the start of the frame: turning on the field after field off detection and replying according to the RFID standard using FSK).

[0058] If FSK modulation is detected, the device 13 responds by utilizing load modulation according to the Qi standard (block 75, Qi charger: respond with load modulation according to the Qi standard).

[0059] according to Figure 2 In the illustrated embodiment, in normal mode (part II), the device 13 issues periodic inquiry frames 27 during which the device 13 generates a field for card mode devices or rechargeable devices within range. The inquiry frame 27 may be repeated several times for any card mode device to respond before returning to standby mode. The purpose of these periodic frames (polling cycles) is to determine the type of external device based on the type of transmitted frames to which the external device responds.

[0060] Frame 27 consists, for example, of two consecutive transmission bursts 29 and 31 , burst 29 (LF RFID request) being configured to generate a field understandable by a card mode device and burst 31 (reverse Qi) being configured to generate a field understandable by a chargeable device.

[0061] In other words, during the frame 27, the device 13 successively implements two transmission bursts 29 and 31, each representing a type of technology (Qi or RFID). The types of technology addressed by the bursts are, in order, the RFID technology and the Qi technology.

[0062] Figure 4 Shown Figure 2 An expanded example of the portion of the timing diagram shown. More precisely, Figure 4 A timing diagram showing frame 27 is shown.

[0063] according to Figure 4In the illustrated embodiment, the burst 29 includes a guard time followed by two consecutive requests, each representing type A or type B. Each of the first request (OOK type a command) and the second request (OOK type B command) is followed by a wait time 33 (timeout for receiving a response). During the wait time 33, the device 13 waits for a response from a type A card mode device or a type B card mode device in its field.

[0064] according to Figure 4 In the embodiment shown, burst 29 and burst 31 are separated by a reset time (RESET).

[0065] according to Figure 4 In the embodiment shown, the burst 31 includes a guard time (guard time) followed by a request (digital ping) representative of Qi technology. The request is followed by a wait time 33 (timeout to receive a response). During the wait time 33, the device 13 waits for a response from a device charging in its field.

[0066] according to Figure 4 In the illustrated embodiment, device 13 is in listener mode before burst 29 , between bursts 29 and 31 , and after burst 31 .

[0067] According to one embodiment, the duration of each pulse 23 is between 50 microseconds (μs) and 100 μs, for example of the order of 70 μs, and the duration of each pulse 29, 31 is between 50 milliseconds (ms) and 100 ms, for example of the order of 70 ms. The duration of the interval 25 and the waiting time 33 is between 200 ms and 1 s.

[0068] Figure 5 Schematically represented in block form Figure 1 An embodiment of the communication circuit 35 of the device 13 is shown.

[0069] The communication circuit 35 is coupled to an antenna 37 (antenna) via a matching circuit 39 (matching circuit). The communication circuit 35 may also be coupled to an application processor 41 (AP) and / or a secure element 43 (SE).

[0070] according to Figure 3 In the illustrated embodiment, the communication circuit 35 comprises:

[0071] a controller 45 (controller), for example a microcontroller or a microprocessor for managing the exchanges between the different elements of the circuit 35 ;

[0072] an RFID reader wireless encoder / decoder 47 (RFID-RW-UART), coupled to the controller 45, for encoding / decoding data in reader mode;

[0073] an RFID card emulation receiver / transmitter 49 (RFID-CE-UART), coupled to the controller 45, for encoding / decoding data in card mode;

[0074] Qi receiver / transmitter analog front end 51 (Qi receiver / transmitter analog front end), coupled to the matching circuit 39, for shaping the received and transmitted signals;

[0075] Transmit / transmit circuit 53 (TX driver) for amplifying the signal provided by controller 45 to Qi analog front end 51 in transmission;

[0076] A frequency demodulator and load modulator / modem (also called backscatter) 55 (Qi demodulator LM / FSK), located between the Qi analog front end 51 and the controller 45, for frequency demodulating the signal received by the Qi analog front end 51;

[0077] A load modulator 57 (load modulator), located between the controller 45 and the matching circuit 39, for influencing the external magnetic field in the RFID card mode or the charger mode; and

[0078] The amplitude demodulator and load modulator / demodulator 59 (RFID demodulator OOK / LM), located between the matching circuit 39 and the controller 45, is adapted to demodulate the received signal in RFID card and reader modes, respectively.

[0079] According to an embodiment, the controller 45 includes an encoding circuit dedicated to Qi technology.

[0080] Figures 6 to 14 Six examples of the operation of circuit 35 are shown, depending on the external device it detects or the external device it detects. Figures 6 to 14 In each of the figures, components not required in the illustrated usage example are not shown.

[0081] Figure 6 The circuit 35 is shown when the device 13 is in reader mode detecting and communicating with a Type A LF device configured in card mode.

[0082] Figure 7 Shows Figure 6 35 is an example timing diagram of frame 27 of circuit 35.

[0083] according to Figure 6 and Figure 7 In the illustrated embodiment, when the device 13 detects an external Class A device configured in card mode and communicating in low frequency (LF), the device 13 operates in reader mode.

[0084] In this mode, the application processor uses the controller 45 to run (link a) I) the low frequency RFID reader wireless application.

[0085] The controller 45 uses the RFID reader wireless encoder / decoder 47 to construct a low frequency RFID reader wireless command or LF RFID RW command (link a) II).

[0086] The controller 45 uses the TX driver 53 and the Qi analog front end 51 to use on-off keying modulation (OOK type A command a) III, Figure 7 )(Link a) III), generates a LF RFID RW command according to type A.

[0087] The response (LM Tag Response, Figure 7 ).

[0088] According to an embodiment not shown, the response of the external device to the device 13 in card mode is demodulated by the Qi demodulator 55 .

[0089] The controller 45 then decodes the external device in card mode response (link a) V) using the RFID reader wireless encoder / decoder 47 and forwards the corresponding data to the application processor 41 (link a) VI).

[0090] During this operation, controller 45 may use secure element 43 to perform any desired cryptographic operations.

[0091] After contact is established between device 13 and a device within range, they both communicate by sending successive commands and responses.

[0092] Figure 8 The circuit 35 is shown when the device 13 is in reader mode detecting and communicating with a Type B LF device configured in card mode.

[0093] Fig. 9 yes Figure 8 Timing diagram of an example of frame 27 in circuit 35.

[0094] according to Figure 8 The illustrated embodiment, after no response to a request in type A, proceeds to detection of an external type B device configured in card mode.

[0095] according to Figure 8 In the illustrated embodiment, when the device 13 detects an external Type B device configured in card mode and communicating in LF, the device 13 operates in reader mode.

[0096] In this mode, the application processor uses the controller 45 to run (link b) I) the low frequency RFID reader wireless application.

[0097] The controller 45 uses the RFID reader wireless encoder / decoder 47 to construct a low frequency RFID reader wireless command or LF RFID RW command (link b) II).

[0098] The controller 45 modulates the amplitude by using on-off keying (OOK type B command B) III, Fig. 9 )(Link B) III) Generates a magnetic field using the TX driver 53 and the Qi analog front end 51, and generates a LF RFID RW command according to the B type.

[0099] After generating the command, the device 13 stops its magnetic field and waits for a reply from the external device.

[0100] The response (FSK type B response, Fig. 9 ).

[0101] The controller 45 then decodes the external device in card mode response (link b) V) using the RFID reader wireless encoder / decoder 47 and forwards the corresponding data to the application processor 41 (link b) VI).

[0102] During this operation, controller 45 may use secure element 43 to perform any desired cryptographic operations.

[0103] After contact is established between the device 13 and a device within range, they both communicate by sending successive commands and responses.

[0104] Fig.10 The circuit 35 is shown when the device 13 is in card mode detecting and communicating with a Type A low frequency device configured in reader mode.

[0105] according to Fig.10 In the illustrated embodiment, when the device 13 detects an external Class A device configured in reader mode and communicating in LF, the device 13 operates in card mode.

[0106] In this mode, the application processor uses the controller 45 to run (link c) I low frequency RFID card emulation application.

[0107] Via the RFID demodulator 59 (link c) II), the commands from the external device in reader mode to the device 13 are demodulated using on-off keying amplitude demodulation.

[0108] The controller 45 then decodes the external device command using the RFID card emulation encoder / decoder 49 (link c) III), and constructs a response using the RFID card emulation encoder / decoder 49 (link c) IV).

[0109] The controller 45 uses load modulation (link c)V) to produce a response according to Type A using a load modulator 57 via the matching circuit 39 when the device is in card mode.

[0110] During this operation, controller 45 may use secure element 43 to perform any desired cryptographic operations.

[0111] Fig.11 The circuit 35 is shown when the device 13 is in card mode detecting and communicating with a Type B LF device configured in reader mode.

[0112] according to Fig.11 In the illustrated embodiment, when the device 13 detects an external Type B device configured in reader mode and communicating in LF, the device 13 operates in card mode.

[0113] In this mode, the application processor uses the controller 45 to run (link d) I) a low frequency RFID card emulation application.

[0114] Commands from an external device in reader mode to the device 13 are demodulated using on-off keying demodulation via the RFID demodulator 59 (link d) II).

[0115] The controller 45 then decodes the external device command using the RFID card emulation encoder / decoder 49 (link d) III), and constructs a response using the RFID card emulation encoder / decoder 49 (link d) IV).

[0116] The controller 45 uses frequency shift keying modulation (FSK modulation) (link d)V), using the TX driver 53 and the Qi analog front end 51, to generate a response according to the B type via the matching circuit 39 when the device is in the card mode.

[0117] During this operation, the controller 45 may use the secure element 43 to perform any cryptographic operations required.

[0118] Fig.12 Circuit 35 is shown when device 13 detects and is charged by a charger device.

[0119] according to Fig.12 In the illustrated embodiment, when the device 13 detects an external charger Qi device, the device 13 operates in a charging mode.

[0120] In this mode, Qi analog pings from an external device in charger mode to device 13 are demodulated using FSK demodulation via Qi demodulator 55 and decoded by controller 45 (link e)1).

[0121] The controller 45 generates a response using the load modulator 57 via the matching circuit 39 (link e) II).

[0122] The device 13 is then charging and the controller 45 transmits the monitoring data to the application processor 41 (link e) III).

[0123] During this operation, the controller 45 may use the secure element 43 if authentication needs to be performed.

[0124] Fig.13 Circuit 35 is shown when device 13 detects and charges a rechargeable device.

[0125] Fig.14 yes Fig.13 Timing diagram of an example of frame 27 in circuit 35.

[0126] according to Fig.13 and 14 In the illustrated embodiment, detection of a chargeable device is performed after no response to the RFID request (frame 27).

[0127] according to Fig.13 In the illustrated embodiment, when the device 13 detects an external Qi device in the charger mode, the device 13 operates in the charger mode.

[0128] In this mode, the controller 45 uses the TX driver 53 and the Qi analog front end 51 to send a digital Qi ping (digital ping f) I using FSK modulation (link f) I. Fig.14 ).

[0129] Response from external device (LM response from the device to be charged, Fig.14 ) is demodulated by the QiQi analog front end 51 (link f) II) using the Qi demodulator 55 and decoded by the controller (link f) III.

[0130] The device 13 then charges the devices within range and the controller 45 transmits the monitoring data to the application processor 41 (link f)III).

[0131] During this operation, the controller 45 may use the secure element 43 if authentication needs to be performed.

[0132] After contact is established between the device 13 and the device in range, they both communicate by sending successive commands and responses. Any subsequent data packets received from the external charger device can then be demodulated by the Qi demodulator 55.

[0133] According to the disclosed embodiments, Figure 2 During the illustrated phase I, the device 13 is adapted to use the Qi demodulator and the RFID demodulator in parallel, whereas during phase II, the device 13 is adapted to use the Qi demodulator and the RFID demodulator sequentially.

[0134] An advantage of the described embodiments is that they make it possible to combine RFID LF and Qi technologies within the same circuit.

[0135] Various embodiments and variations have been described. Those skilled in the art will appreciate that certain features of these embodiments may be combined, and those skilled in the art will readily generate other variations.

[0136] Finally, actual implementation of the embodiments and variations described herein is within the capabilities of those skilled in the art, based on the functional description provided above.

[0137] A device can be summarized as including a frequency demodulator (55) and an amplitude demodulator (59), the device being configured to use the two demodulators in parallel in a first mode (I) and to activate an RFID card mode or a Qi charger mode based on results provided by the demodulators.

[0138] The method implemented by the device can be summarized as comprising a frequency demodulator (55) and an amplitude demodulator (59), wherein the device uses the two demodulators in parallel in a first mode (I) and uses the two demodulators serially in a second mode (II).

[0139] The frequency and amplitude demodulator may also include a load modulator / demodulator.

[0140] In the second mode, both the frequency demodulator and the amplitude demodulator may operate continuously.

[0141] The load modulator (57) of the device may be used when the device is communicating with an external RFID device which is configured in reader mode.

[0142] The load modulator (57) can be used when the device is charged by an external device and when it emulates an RFID card in a Type A configuration.

[0143] When the device is in the second mode, the device's Qi analog front end (51) may be adapted to frequency modulate or amplitude modulate data, the frequency modulated data being used to communicate with a Qi charger device, the amplitude modulated data being used to communicate with an RFID device configured in card mode.

[0144] The amplitude demodulator (59) can be used to demodulate the response of an external Type A device configured in card mode in load modulation.

[0145] The amplitude demodulator (59) may be used to demodulate commands received from an external device configured in reader mode.

[0146] The frequency demodulator (55) may be used to demodulate responses received from an external Type B device configured in card mode.

[0147] The frequency demodulator (55) may be used to demodulate the digital ping or any subsequent data packets received from the external charging device.

[0148] The frequency demodulator (55) may be used to demodulate the response received from the external rechargeable device.

[0149] When the device detects an external field on the antenna, it can check whether the external field comes from an RFID device or from a Qi device.

[0150] This can be checked by transmitting periodic interrogation frames in both RFID mode and Qi mode.

[0151] The various embodiments described above can be combined to provide further embodiments. These and other changes can be made to the embodiments in light of the above detailed description. In general, in the following claims, the terms used should not be interpreted as limiting the claims to the specific embodiments disclosed in the specification and claims, but should be interpreted as including all possible embodiments and the full range of equivalents to which these claims are entitled. Therefore, the claims are not limited by this disclosure.

Claims

1. An electronic device, comprising: a frequency demodulator configured to provide a first demodulation result; as well as An amplitude demodulator is configured to provide a second demodulation result, wherein: The electronic device is configured to: In a first mode, the frequency demodulator and the amplitude demodulator are used in parallel; and activating a radio frequency identification RFID card mode or a Qi charger mode based on the first demodulation result and the second demodulation result; and The frequency demodulator and the amplitude demodulator are used continuously in a second mode. 2 . The electronic device according to claim 1 , further comprising a load modulator configured to influence an external magnetic field in the RFID card mode or the Qi charger mode. 3 . The electronic device of claim 2 , wherein the electronic device uses the load modulator in response to the electronic device communicating with an external RFID Type A device configured in a reader mode.

4. The electronic device of claim 3, wherein the load modulator is used in response to the electronic device being charged by an external device or when the electronic device emulates an RFID card configured as Type A.

5. The electronic device according to claim 1, comprising: The Qi analog front end is configured to frequency modulate data or amplitude modulate data in response to the electronic device being in the second mode, the frequency modulated data is used to communicate with the Qi chargeable device, and the amplitude modulated data is used to communicate with the RFID device configured in the card mode.

6. The electronic apparatus of claim 1, wherein the amplitude demodulator is configured to demodulate a response of an external RFID Type A device configured in card mode. 7 . The electronic apparatus of claim 1 , wherein the amplitude demodulator is configured to demodulate a command received from an external device configured in a reader mode. 8 . The electronic apparatus of claim 1 , wherein the frequency demodulator is configured to demodulate a response received from an external Type B device configured in a card mode. 9 . The electronic apparatus of claim 1 , wherein the frequency demodulator is configured to demodulate a digital ping or subsequent data packet received from an external charging device.

10. The electronic apparatus of claim 1, wherein the frequency demodulator is configured to demodulate a response received from an external chargeable device.

11. The electronic device according to claim 1, comprising: antenna, wherein in response to detecting an external field on the antenna, the electronic device checks whether the field is generated by an RFID device or a Qi device.

12. The electronic device according to claim 11, wherein the electronic device checks whether the field is generated by the RFID device depending on whether the modulation type is amplitude modulation or frequency modulation.

13. A method for operating an electronic device, comprising: providing a first demodulation result by a frequency demodulator of the device; providing a second demodulation result by an amplitude demodulator of the device; In a first mode, the frequency demodulator and the amplitude demodulator are used in parallel; Based on the first demodulation result and the second demodulation result, activating a radio frequency identification RFID card mode or a Qi charger mode; as well as In a second mode, the frequency demodulator and the amplitude demodulator are used continuously.

14. The method of claim 13, wherein the apparatus further comprises a load modulator configured to influence an external magnetic field in the RFID card mode or the Qi charger mode.

15. The method according to claim 14, comprising: The load modulator is used in response to communicating with an external RFID Type A device configured in reader mode.

16. The method according to claim 15, comprising: The load modulator is used in response to the apparatus being charged by an external device or in response to the apparatus emulating an RFID card configured as Type A.

17. The method according to claim 13, comprising: In response to the device being in the second mode, the data is frequency modulated or the data is amplitude modulated, the frequency modulated data is used to communicate with the Qi chargeable device, and the amplitude modulated data is used to communicate with the RFID device configured in the card mode.

18. The method of claim 13, wherein the amplitude demodulator is configured to demodulate a response of an external RFID Type A device configured in card mode.

19. The method of claim 13, wherein the amplitude demodulator is configured to demodulate commands received from an external device configured in a reader mode.

20. The method of claim 13, wherein the frequency demodulator is configured to demodulate a response received from an external Type B device configured in card mode.

21. The method of claim 13, wherein the frequency demodulator is configured to demodulate a digital ping or subsequent data packet received from an external charging device.

22. The method of claim 13, wherein the frequency demodulator is configured to demodulate a response received from an external chargeable device.

23. The method according to claim 13, comprising: In response to detecting an external field at the antenna, it is checked whether the field is generated by an RFID device or by a Qi device.

24. The method according to claim 23, comprising: Transmit periodic inquiry frames to detect whether the Qi device or the RFID device that can be charged is within range.

25. The method of claim 13, comprising: When operating in low power mode, detect RFID devices or Qi devices, In response to detecting the RFID device or the Qi device, transitioning to a polling mode; as well as In the polling mode, it is determined whether the RFID device or the Qi device is within range.

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