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 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, and external control signals. It contains eight accurate Schmitt trigger inputs with clamp circuits and communicates via the I2C-bus.
The device operates in two modes: Normal I/O expander where it acts like a slave while the microcontroller is running, and Sleep mode where the IC acts as a master to wake up the microcontroller during events. Key features include a 32.768 kHz RC or crystal oscillator, a watchdog timer function, and an LED blinking oscillator.
| Supply Voltage (Vop) | 4.5 V to 5.5 V |
|---|---|
| Quiescent Supply Current (Iq) | 130 µA to 200 µA |
| Maximum SCL Clock Frequency | 400 kHz |
| Virtual Junction Temperature (Ty) | 150 °C |
| Package Type | SOT137-1 plastic small outline package; 24 leads |
| Oscillator Frequency | 32.768 kHz |
It acts as an intelligent I/O expander to interface between a microcontroller and input signals like ignition or low supply detection.
Communication is performed via the I2C-bus at a maximum frequency of 400 kHz.
Yes, it includes a 32.768 kHz RC oscillator and/or a 32.768 kHz crystal oscillator.