SAA1305T

General description

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 (master) is running and the SAA1305T acts like a slave.
2. Sleep mode of the total application: the microcontroller is stopped and the SAA1305T acts like a master. 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.

Features

• 8 accurate Schmitt trigger inputs with clamp circuits
• Very low quiescent current
• Reset generator circuit
• Changed information output
• On/off output to control a regulator IC which supplies the microcontroller
• 32.768 kHz RC oscillator and/or a 32.768 kHz crystal oscillator
• No delayed reset needed (start-up behaviour oscillator fixed by internal logic)
• Watchdog timer function
• Blinking LED oscillator with drive circuit for LED
• Watch function.

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Pricing/ordering/availability

Block diagrams/pinning

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SAA1305T links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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