The I2C bus is active when STANDBY pin is de-asserted (for example, STANDBY pin is set to logic high). This is when the device is either in Mute or Play mode. TI warranties TAS5421-Q1 and TAS5411-Q1 operation when the device is out of STANDBY as described in the data sheet (SLOS921B and SLOS814D).

The SDA pin usage is described in the following sections. The described options below follow the data sheet recommendation (for example, all I2C communications is performed during STANDBY high). The descriptions are meant to clarify the usage stated in the data sheets. The solutions described below do not alter TI’s warranty, other terms of sale, or the applicable specification.