M41T00AUD(2007) 데이터 시트보기 (PDF) - STMicroelectronics

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M41T00AUD
(Rev.:2007)

Serial real-time clock with audio

STMicroelectronics 

M41T00AUD

Serial real-time clock with audio

Features

■ Combination real-time clock with audio

– Serial RTC based on M41T00

– Audio section provides:

– 300mW differential audio amplifier

– 256 and 512Hz tone generation

– -33 to +12dB gain, 3dB steps (16 steps

plus MUTE)

■ Real-time clock details:

– Superset of M41T00

– 3.0 to 3.6V operation

– Timekeeping down to 1.7V

– Automatic backup switchover circuit

– Ultra low 400nA backup current at 3.0V

(typ)

– Suitable for battery or capacitor backup

– On-chip trickle charge circuit for backup

capacitor

– 400kHz 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 32,768Hz quartz

crystal

– Calibration register provides for

adjustments of -63 to +126ppm

– Oscillator supports crystals with up to

40kΩ series resistance, 12.5pF load

capacitance

– Oscillator fail detect circuit OF bit indicates

when oscillator has stopped for four or

more cycles

DFN16 (5mm x 4mm)

“D” Suffix

■ Audio section

– Power amplifier

– Differential output amplifier

– Provides 300mW into 8Ω (THD+N = 2%

(max), fin = 1kHz)

– Summing node at audio input

– Inverting configuration with summing

resistors into the minus (-) terminal

– 0dB gain with 10kΩ feedback resistor

and 20kΩ input summing resistors

– Signal input centered at VDD/2

– 1.6VP-P analog input range (max)

– 256 or 512 Hz signal multiplexing with

analog input to provide audio with beep

tones

– Volume control, 4-bit register

– Allows gain adjustment from -33dB to

+12dB

– 3dB steps

– MUTE bit

– Audio automatically shuts off in backup

mode

■ 0°C to 70°C operation

■ Small DFN16 package (5mm x 4mm)

December 2007

Rev 2

1/44

www.st.com

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