Method for operating an integrated MEMS microphone device comprising a package housing enclosing an interior cavity, wherein an integrated MEMS microphone die with a movable membrane, at least one environmental sensor and a thermal decoupling circuit are arranged inside the cavity, the method comprising the steps of: - repeatedly operating the environmental sensor in a measurement mode; - activating the thermal decoupling circuit for a transition phase (TP1, TP2) preceding and/or succeeding the measurement mode of the environmental sensor; and - during the transition phase (TP1, TP2), gradually adjusting of temperature inside the cavity due to the flow of electrical current through the thermal decoupling circuit; wherein: - the measurement mode is initiated by switching the environmental sensor on, and/or terminated by switching the environmental sensor off, - heat dissipation due to the flow of electrical current through the thermal decoupling circuit meets a first level when the measurement mode is initiated, and/or drops from the first level when the measurement mode is terminated, and - the thermal decoupling circuit comprises an adjustable current source or an adjustable current sink to dissipate heat into the cavity and the thermal decoupling circuit is separate from the environmental sensor, and wherein: - a dissipation current (Id) of the thermal decoupling circuit is adjusted depending on the transition function, and wherein - in the transition phase preceding the measurement mode, the dissipation current (Id) is adjusted until it meets an operating current (Iq), wherein the operating current (Iq) is defined by the operating condition of the measurement mode, and/or - in the transition phase succeeding the measurement mode, the dissipation current (Id) is adjusted to drop from operating current (Iq). - repeatedly operating the environmental sensor in a measurement mode; - activating the thermal decoupling circuit for a transition phase (TP1, TP2) preceding and/or succeeding the measurement mode of the environmental sensor; and - during the transition phase (TP1, TP2), gradually adjusting of temperature inside the cavity due to the flow of electrical current through the thermal decoupling circuit; wherein: - the measurement mode is initiated by switching the environmental sensor on, and/or terminated by switching the environmental sensor off, - heat dissipation due to the flow of electrical current through the thermal decoupling circuit meets a first level when the measurement mode is initiated, and/or drops from the first level when the measurement mode is terminated, and - the thermal decoupling circuit comprises an adjustable current source or an adjustable current sink to dissipate heat into the cavity and the thermal decoupling circuit is separate from the environmental sensor, and wherein: - a dissipation current (Id) of the thermal decoupling circuit is adjusted depending on the transition function, and wherein - in the transition phase preceding the measurement mode, the dissipation current (Id) is adjusted until it meets an operating current (Iq), wherein the operating current (Iq) is defined by the operating condition of the measurement mode, and/or - in the transition phase succeeding the measurement mode, the dissipation current (Id) is adjusted to drop from operating current (Iq).