To provide a semiconductor device that maintains the accuracy of determining a failure of a sound reproduction device despite a change in temperature.SOLUTION: A semiconductor device has a normal operation mode, an inspection mode, and a calibration mode, and comprises: a test signal generation circuit 60 that, in the inspection mode for determining the state of a sound reproduction device 3, modulates a test signal to generate a third modulated signal TP and a fourth modulated signal TN; an amplifier circuit 50 that outputs a third amplified signal DOXP obtained by amplifying the third modulated signal to a first output terminal 91, and outputs a fourth amplified signal DOXN obtained by amplifying the fourth modulated signal to a second output terminal 92; a peak frequency detection circuit 70 that measures the electric potential difference between the first output terminal and the second output terminal, and detects a peak frequency fpeak at which the impedance of the sound reproduction device that is a speaker or a buzzer reaches a peak; and a determination circuit 61 that determines whether the peak frequency is included in a reference frequency range determined on the basis of the frequency band of the test signal and information on the temperature of the sound reproduction device.SELECTED DRAWING: Figure 1

    【課題】温度が変化しても音再生装置の故障判定の精度を維持する半導体装置を提供する。【解決手段】通常動作モード、検査モード及びキャリブレーションモードを有する半導体装置は、音再生装置3の状態を判定する検査モードにおいて、テスト信号を変調して第3変調信号TP及び第4変調信号TNを生成するテスト信号生成回路60と、第3変調信号を増幅した第3増幅信号DOXPを第1出力端子91に出力するとともに、第4変調信号を増幅した第4増幅信号DOXNを第2出力端子92に出力する増幅回路50と、第1出力端子と第2出力端子との電位差を測定し、スピーカー或いはブザーである音再生装置のインピーダンスがピークとなるピーク周波数fpeakを検出するピーク周波数検出回路70と、ピーク周波数が、テスト信号の周波数帯域と音再生装置の温度情報とに基づいて決められた基準周波数範囲に含まれるか否かを判定する判定回路61と、を備える。【選択図】図1


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    Title :

    SEMICONDUCTOR DEVICE AND ELECTRONIC APPARATUS


    Additional title:

    半導体装置及び電子機器


    Contributors:

    Publication date :

    2025-02-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04R LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS , Lautsprecher, Mikrofone, Schallplatten-Tonabnehmer oder ähnliche akustische, elektromechanische Wandler / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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