Serial Real-time Clock With Audio

The M41T00AUD is a low power serial Real-Time Clock (RTC) with an integral Audio section with Tone generator and 300mW output Amplifier The RTC is a superset of the M41T00 with enhancements such as a precision reference for switchover, an Oscillator fail detect circuit and storing of the time at power down. The Audio section includes a summing Amplifier (inverting) at the input. An 8kHz low pass Filter follows that with a 16 step programmable gain stage next. A 256 or 512Hz Audio Tone CAN be switched into the Filter in place of the input signal. From the gain stage, the 300mW Amplifier drives the output pins. By STMicroelectronics