The SAA1305T is an on/off logic IC, intended for use in car radios to interface between a microcontroller and various input signals such as ignition, low supply detection, on/off key and external control signals.
The SAA1305T can replace an existing on/off logic built-up with discrete components.
The SAA1305T contains 8 inputs with accurate Schmitt triggers and clamp circuits. The main function of this IC is an intelligent I/O expander with 2 modes of operation:
The communication with the IC is performed via the I²C-bus (400 kHz). Extra functions of the SAA1305T are:
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