The StereoAmp click features a 3.5mm input jack and four output screw terminals for connecting passive speakers. It runs on either 3.3V or 5V power supply and communicates with the MCU through the I2C interface.
Each LM48100Q-Q1 is used for one channel, left or right. Both input paths have their own independent, 32-step volume control.
The mixer, volume control and device mode select are controlled through an I2C compatible interface.
BTL or a bridge-tied load is an output configuration where the speakers are connected (bridged) between two audio amplifier outputs. In a single-ended configuration one side of the load is connected to the ground. Here both channels are connected, but one has an inverted signal. Compared to a single-ended configuration BTL has two times more voltage swing across the load (speakers).
The doubled voltage swing means four times more power to the speakers. This is ideal for applications and devices where due to battery size the supply voltage is lower.
The IC has an I2C selectable low power shutdown mode that disables the device, reducing current consumption to 0.01μA.
The output fault detection system can sense load conditions and protect the device during short circuit events and detect open circuit conditions. The LM48100Q-Q1 output fault diagnostics are controlled through the I2C interface.
