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On/off logic IC

SAA1305T Archived
  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

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:

  • 1. Normal I/O expander: the microcontroller (leader) is running and the SAA1305T acts like a follower.
  • 2. Sleep mode of the total application: the microcontroller is stopped and the SAA1305T acts like a leader. During an event, the microcontroller is awakened.

The communication with the IC is performed via the I²C-bus (400 kHz). Extra functions of the SAA1305T are:

  • LED blinker circuit
  • One-day watch
  • Watchdog timer.
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