M41T00AUD

M41T00AUD Serial real-time clock (RTC) with audio Features Combination real-time clock with audio ■ ■ Serial real-time clock (RTC) based on M41T00 Audio section provides: – 300 mW differential audio amplifier – 256 and 512 Hz tone generation – –33 to +12 dB gain, 3 dB steps (16 steps plus MUTE) 0 °C to 70 °C operation Small DFN16 package (5 mm x 4 mm) DFN16 (5 mm x 4 mm) ■ ■ Audio section ■ Real-time clock details ■ ■ ■ Superset of M41T00 3.0 to 3.6 V operation – Timekeeping down to 1.7 V Automatic backup switchover circuit – Ultra-low 400 nA backup current at 3.0 V (typ) – Suitable for battery or capacitor backup – On-chip trickle charge circuit for backup capacitor 400 kHz I2C bus M41T00 compatible register set with counters for seconds, minutes, hours, day, date, month, years, and century – Automatic leap year compensation – HT bit set when clock goes into backup mode RTC operates using 32,768 Hz quartz crystal – Calibration register provides for adjustments of –63 to +126 ppm – Oscillator supports crystals with up to 40 kΩ series resistance, 12.5 pF load capacitance Oscillator fail detect circuit OF bit indicates when oscillator has stopped for four or more cycles ■ www.DataSheet.net/ Power amplifier – Differential output amplifier – Provides 300 mW into 8 Ω (THD+N = 2% (max), fin = 1 kHz) Summing node at audio input – Inverting configuration with summing resistors into the minus (-) terminal – 0 dB gain with 10 kΩ feedback resistor and 20 kΩ input summing resistor...