SAA1300

The SAA1300 is for switching on and off the supply lines of various circuit parts via an I²C bus signal. Furthermore, it can be used to supply current for switching diodes in radio and television tuners. It contains 5 output stages, which are capable of supplying up to 85 mA in the ON state or sinking up to -100 A in the OFF state.

Current limiting and short-circuit protection are included. The output stages are driven by a shift register/latch combination which is loaded via data from the I²C bus. A power-on reset of the latches ensures the OFF state of the output stages (OUT 2 to OUT 5) without data reception from the I²C bus. A subaddressing system allows the connection of up to three circuits on the same I²C bus lines; one of the outputs (OUT 1, pin 7) can also be used as an input to select the device via a simple internal A/D converter.