# US 2021/0243537 A1 · Low-Power Differential Communication Architectures > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243537 A1 - Document ID: US20210243537A1 - Status: Published application - Kind: A1 - Application number: 16/778,425 - Filed: 2020-01-31 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: Advanced Bionics AG - Applicants: Advanced Bionics AG - Inventors: R. Tissa Karunasiri; Jie Yan; Scott Kenneth Arfin; Don Banh - Web page: https://patentgrep.com/patent/US20210243537A1 ## CPC - H04R 25/554: {using a wireless connection, e.g. between microphone and amplifier or using Tcoils} - A61N 1/36038: {Cochlear stimulation} - A61N 1/37235: {Aspects of the external programmer} - A61N 1/37276: {characterised by means for reducing power consumption during telemetry} - H03L 7/0812: {and where no voltage or current controlled oscillator is used} - H04R 25/30: {Monitoring or testing of hearing aids, e.g. functioning, settings, battery power} - A61N 1/0541: {Cochlear electrodes} - A61N 1/37252: {Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data} - H04B 1/40: Circuits - H04R 2225/021: Behind the ear [BTE] hearing aids - H04R 2225/67: Implantable hearing aids or parts thereof not covered by H04R25/606 - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - H03L: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B) - H04B: TRANSMISSION ## Abstract A device includes a voltage source configured to selectively drive a first wire and a second wire with a first voltage level. The device further includes an adjustable current source configured to selectively discharge the first and second wire. The device further includes a control circuit configured to output data and power by way of the first and second wire by selectively coupling the first wire to the voltage source and the second wire to the adjustable current source such that, during a first time period, the first wire has the first voltage level and the second wire has a second voltage level. The data and power is output by also selectively switching the couplings of the first time period such that, during a second time period subsequent to the first time period, the first wire has the second voltage level and the second wire has the first voltage level. ## Claims ### Claim 1 A device comprising: a voltage source configured to selectively drive a first wire and a second wire with a first voltage level, the first and second wires included in a differential signaling wire pair; an adjustable current source configured to selectively discharge the first wire and the second wire; and a control circuit configured to output data and power by way of the differential signaling wire pair by: selectively coupling the first wire to the voltage source and the second wire to the adjustable current source such that, during a first time period, the first wire has the first voltage level and the second wire has a second voltage level less than the first voltage level and greater than zero volts; and selectively switching the first wire from being coupled to the voltage source to being coupled to the adjustable current source and the second wire from being coupled to the adjustable current source to being coupled to the voltage source such that, during a second time period subsequent to the first time period, the first wire has the second voltage level and the second wire has the first voltage level. ### Claim 2 (depends on 1) The device of claim 1, wherein the control circuit is further configured to set the second voltage level by controlling a characteristic of the adjustable current source. ### Claim 3 (depends on 2) The device of claim 2, wherein the characteristic includes a value of an output of the adjustable current source. ### Claim 4 (depends on 2) The device of claim 2, wherein the characteristic includes an on time of the adjustable current source. ### Claim 5 (depends on 2) The device of claim 2, wherein the control circuit is configured to determine a value of the characteristic by: measuring the second voltage level; comparing the second voltage level to a predetermined voltage level; and adjusting, based on the comparing, the value of the characteristic. ### Claim 6 (depends on 2) The device of claim 2, wherein the control circuit is configured to determine a value of the characteristic by: selecting a first value of the second voltage level; sending a command by way of the differential signaling wire pair using the first value of the second voltage level; and selecting, based on whether a response to the command is received, a second value of the second voltage level. ### Claim 7 (depends on 1) The device of claim 1, wherein the control circuit is further configured to set the second voltage level by controlling an amount of time the second wire is selectively coupled to the adjustable current source. ### Claim 8 (depends on 7) The device of claim 7, wherein the control circuit further comprises a pulse circuit configured to control the amount of time. ### Claim 9 (depends on 8) The device of claim 8, wherein the pulse circuit comprises a delay locked loop (DLL). ### Claim 10 (depends on 7) The device of claim 7, wherein the amount of time is a portion of a length of the first time period. ### Claim 11 (depends on 10) The device of claim 10, wherein during a remainder of time of the length of the first time period, the second wire is uncoupled from the adjustable current source. ### Claim 12 (depends on 11) The device of claim 11, wherein, during the remainder of time, the second voltage level is maintained by a capacitance on the second wire. ### Claim 13 (depends on 11) The device of claim 11, wherein, during the remainder of time, the second wire is configured to be set to a third voltage level different from the first voltage level and the second voltage level by another device. ### Claim 14 The device of 1, wherein the first device is a behind-the-ear (BTE) unit of a cochlear implant system and the second device is a headpiece of the cochlear implant system. ### Claim 15 A system comprising: a first device; and a second device coupled to the first device by a differential signaling wire pair comprising a first wire and a second wire, the first device comprising: a voltage source configured to selectively drive the first wire and the second wire with a first voltage level; an adjustable current source configured to selectively discharge the first wire and the second wire; and a control circuit configured to output data and power by way of the differential signaling wire pair by: selectively coupling the first wire to the voltage source and the second wire to the adjustable current source such that, during a first time period, the first wire has the first voltage level and the second wire has a second voltage level less than the first voltage level and greater than zero volts; and selectively switching the first wire from being coupled to the voltage source to being coupled to the adjustable current source and the second wire from being coupled to the adjustable current source to being coupled to the voltage source such that, during a second time period subsequent to the first time period, the first wire has the second voltage level and the second wire has the first voltage level; the second device comprising: a receiving circuit configured to: receive the data and the power by way of the differential signaling wire pair; and transmit the data by way of a radio frequency (RF) transmitter. ### Claim 16 (depends on 15) The system of claim 15, wherein: the control circuit is further configured to set the second voltage level by controlling an amount of time the second wire is selectively coupled to the adjustable current source, the amount of time being a portion of a length of the first time period; the second device further comprises a transmitting circuit configured to output additional data to the first device by way of the differential signaling wire pair by: selectively driving the second wire to a third voltage level that is different from the first voltage level and the second voltage level during a remainder of time of the length of the first time period. ### Claim 17 (depends on 15) The system of claim 15, wherein the first device is a behind-the-ear (BTE) unit of a hearing system and the second device is a headpiece of the hearing system. ### Claim 18 A cochlear implant system comprising: an implant configured to apply electrical stimulation representative of one or more audio signals to an auditory pathway of a user; a headpiece including a transmitter configured to wirelessly transmit power and data to the implant; an external unit coupled to the headpiece by a differential signaling wire pair comprising a first wire and a second wire, the external unit comprising: a voltage source configured to selectively drive the first wire and the second wire with a first voltage level; an adjustable current source configured to selectively discharge the first wire and the second wire; and a control circuit configured to output data and power by way of the differential signaling wire pair by: selectively coupling the first wire to the voltage source and the second wire to the adjustable current source such that, during a first time period, the first wire has the first voltage level and the second wire has a second voltage level less than the first voltage level and greater than zero volts; and selectively switching the first wire from being coupled to the voltage source to being coupled to the adjustable current source and the second wire from being coupled to the adjustable current source to being coupled to the voltage source such that, during a second time period subsequent to the first time period, the first wire has the second voltage level and the second wire has the first voltage level. ### Claim 19 (depends on 18) The system of claim 18, wherein: the control circuit is further configured to set the second voltage level by controlling an amount of time the second wire is selectively coupled to the adjustable current source, the amount of time being a portion of a length of the first time period; the headpiece further comprises a transmitting circuit configured to output additional data to the BTE by way of the differential signaling wire pair by: selectively driving the second wire to a third voltage level that is different from the first voltage level and the second voltage level during a remainder of time of the length of the first time period. ### Claim 20 (depends on 19) The system of claim 19, wherein the control circuit further comprises a pulse circuit including a delay locked loop (DLL) configured to control the amount of time.