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  • The M41T00AUD is a low-power serial real-time clock (RTC) with an integral audio section with tone generator and 300 mW 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 8 kHz low-pass filter follows that with a 16-step programmable gain stage next. A 256 or 512 Hz audio tone can be switched into the filter in place of the input signal. From the gain stage, the 300 mW amplifier drives the output pins.

    The M41T00AUD has a built-in power sense circuit which detects power failures and automatically switches to the backup input when VCCis removed. Backup power can be supplied by a capacitor or by a battery such as a lithium coin cell. The device includes a trickle charge circuit for charging the capacitor.
    The RTC includes a built-in 32.768 kHz oscillator controlled by an external crystal. Eight register bytes are used for the clock/calendar functions and are superset compatible with the M41T00. Two additional registers control the audio section and the trickle charger. The 10 registers are accessed over a 400 kHz I2C bus. The address register increments automatically after each byte READ or WRITE operation thus streamlining transfers by eliminating the need to send a new address for each byte to be transferred.
    Typical data retention times will be in excess of 5 years with a 50 mAh 3 V lithium cell.

    Key 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)
    • 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
    • Audio section
      • 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 resistors
        • Signal input centered at VDD/2
        • 1.6 VP-Panalog 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 –33 dB to +12 dB
        • 3 dB steps
        • MUTE bit
      • Audio automatically shuts off in backup mode

Sample & Buy

Part Number
Package
Packing Type
Temperature (°C) Marketing Status
Budgetary Price (US$)*
Quantity
NVRAM size (B)
More info
Order from Distributors
Order from ST
min
max
M41T00AUDD1F DFN16 5X4X0.9 Tape And Reel 0 70
Active
1.881 10000 -
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

No availability of distributors reported, please contact our sales office

M41T00AUDD1F

Package

DFN16 5X4X0.9

Packing Type

Tape And Reel

Unit Price (US$)

1.881*

Operating Temperature (°C)

(min)

0

(max)

70

Marketing Status

Active

Unit Price (US$)

1.881

Quantity

10000

NVRAM size (B)

-

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Embedded Software

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS5259
      Serial real-time clock (RTC) with audio
      5.0
      376.1 KB
      PDF
      DS5259

      Serial real-time clock (RTC) with audio

    • Description Version Size Action
      AN3060
      Applications guide for serial real-time clocks (RTCs)
      3.0
      878.56 KB
      PDF
      AN1011
      Battery technology used in NVRAM and real-time clock (RTC) products from ST
      4.0
      248.17 KB
      PDF
      AN934
      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
      4.1
      123.42 KB
      PDF
      AN4641
      Integrating TIMEKEEPER® and real-time clock supervisor functions
      1.0
      479.28 KB
      PDF
      AN923
      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
      4.0
      142.23 KB
      PDF
      AN1572
      Power-down time-stamp function in serial real-time clocks (RTCs)
      2.0
      171.31 KB
      PDF
      AN1336
      Power-fail comparator for NVRAM supervisory devices
      2.0
      127.81 KB
      PDF
      AN1012
      Predicting the battery life and data retention period of NVRAMs and serial RTCs
      4.1
      439.45 KB
      PDF
      AN2583
      Understanding and applying the M41T00AUD real-time clock with audio
      1.2
      211.9 KB
      PDF
      AN3060

      Applications guide for serial real-time clocks (RTCs)

      AN1011

      Battery technology used in NVRAM and real-time clock (RTC) products from ST

      AN934

      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products

      AN4641

      Integrating TIMEKEEPER® and real-time clock supervisor functions

      AN923

      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs

      AN1572

      Power-down time-stamp function in serial real-time clocks (RTCs)

      AN1336

      Power-fail comparator for NVRAM supervisory devices

      AN1012

      Predicting the battery life and data retention period of NVRAMs and serial RTCs

      AN2583

      Understanding and applying the M41T00AUD real-time clock with audio

Publications and Collaterals

    • Description Version Size Action
      Serial real-time clock ICs 1.0
      827.11 KB
      PDF

      Serial real-time clock ICs

Quality & Reliability

    • Description Version Size Action
      Products Underwriter Laboratories (UL) Information 2.1
      543.21 KB
      PDF

      Products Underwriter Laboratories (UL) Information

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T00AUDD1F
Active
DFN16 5X4X0.9 Industrial Ecopack2

M41T00AUDD1F

Package:

DFN16 5X4X0.9

Material Declaration**:

Marketing Status

Active

Package

DFN16 5X4X0.9

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.