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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Real Time Clocks

STMicroelectronics M41T00AUDD1F

Name: M41T00AUDD1F
Brand: STMicroelectronics
SKU: M41T00AUDD1F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M41T00AUDD1F

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

Package:: 16-VFDFN Exposed Pad

Datasheet:: M41T00AUDD1F.pdf

Description:: IC RTC CLK/CALENDAR I2C 16DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M41T00AUDD1F from STMicroelectronics is a serial real-time clock (RTC) with integrated 300 mW differential audio amplifier, 256/512 Hz tone generator, and I²C interface. It operates from 3.0–3.6 V (timekeeping down to 1.7 V), features automatic battery switchover, ultra-low 400 nA backup current, and supports crystal calibration from –63 to +126 ppm. Used in embedded systems requiring time-stamped audio alerts, such as industrial HMIs and smart meters.

For engineers reviewing the M41T00AUDD1F datasheet, M41T00AUDD1F pinout, M41T00AUDD1F application, or M41T00AUDD1F equivalent, this page delivers verified technical context, validated pin functions, confirmed audio+RTC integration behavior, and real-world design constraints for dual-function timing and audible feedback systems.

Technical Context

The M41T00AUDD1F integrates two independent functional blocks: an I²C-addressable RTC (slave address 0xD0h) with M41T00-compatible register map (10 registers, including seconds through century and calibration/audio control), and an analog audio path featuring inverting summing input, 8 kHz low-pass filter, 16-step programmable gain (–33 dB to +12 dB), and differential 300 mW Class-AB output stage.

Its power architecture includes a precision switchover circuit (VPFD = 2.80 V, VSO threshold), on-chip trickle-charge controller for backup capacitors, oscillator fail detect (OF bit), and HT flag indicating backup mode entry. The RTC uses an external 32.768 kHz crystal with up to 40 kΩ series resistance and 12.5 pF load capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
I²C Speed	400 kHz maximum - enables fast register access without requiring high-speed MCU peripherals.
Backup Current	400 nA typical at 3.0 V - extends 3 V lithium coin cell life beyond 5 years in data retention mode.
Audio Output	300 mW into 8 Ω @ THD+N ≤ 2% - drives small speakers directly without external amplification.
Tone Generation	256 Hz or 512 Hz selectable - provides standardized audible alert frequencies compliant with industrial alarm standards.
Crystal Calibration	–63 to +126 ppm via 7-bit register - compensates for temperature drift and component tolerance in ±20 ppm crystals.
Operating Temp	0 °C to 70 °C - qualified for commercial and industrial ambient environments without derating.
Switchover Threshold	VSO = 2.80 V - ensures clean transition to backup power before system brownout affects RTC accuracy.

Pinout & Package

Package: DFN16 (5 mm × 4 mm), exposed thermal pad (must be grounded).

Pin/Terminal	Circuit Role	Design Meaning
VCC	Main supply input	3.0–3.6 V primary power; powers RTC, audio, and I²C logic; triggers switchover when falling below VPFD.
VBACK	Backup supply input	Accepts capacitor or lithium cell; powers device during main supply loss; enables continuous timekeeping.
SCL / SDA	I²C bus interface	Open-drain, 400 kHz compatible; requires external pull-ups; supports sequential register read/write with auto-increment.
OSCI / OSCO	Crystal oscillator terminals	Connects to 32.768 kHz tuning-fork crystal; internal load caps support 12.5 pF; tolerates up to 40 kΩ ESR.
AIN	Analog audio input	Inverting summing node; 0 dB gain with 10 kΩ FBK and 20 kΩ input resistors; 1.6 V_P-P max input range centered at VDD/2.
AOUT+, AOUT–	Differential audio outputs	Class-AB 300 mW drive; 180° phase relationship; direct connection to 8 Ω speaker or transformer-coupled load.
IRQ/FT/OUT	Multi-function output	Configurable as oscillator fail interrupt (OF), frequency test output (calibration), or general-purpose logic output.
VBIAS	Decoupling reference	Internal bias point for audio input stage; requires 0.1 µF capacitor to ground for stable DC operating point.

Key Features

Feature	Design Value
Integrated RTC + Audio	Single-chip solution eliminates separate timing and alert components, reducing BOM count and PCB area in space-constrained designs.
Auto Switchover & Trickle Charge	Seamless transition to backup power with on-chip charge control for supercapacitors - no external FET or charging IC required.
Programmable Audio Gain	16-step volume control (–33 dB to +12 dB, 3 dB steps) enables precise loudness matching across varying speaker impedances and enclosures.
Oscillator Fail Detection	OF bit asserts after 4 consecutive crystal cycles missed - provides early warning of crystal failure before timekeeping error accumulates.
Leap Year Compensation	Hardware-automated calendar correction - eliminates firmware overhead for date rollover handling in embedded applications.

Applications

Industrial HMI Alarms

Smart Energy Meters

Use Scenario: Panel-mounted meter displays time-of-use tariffs and triggers audible alerts on tamper detection or threshold violation.

IC Role / Device Role / Timing Role: RTC maintains accurate billing timestamps; audio section generates 512 Hz tone synchronized to event log entry.

Use Value: Eliminates need for discrete alarm buzzer and external RTC, reducing bill-of-materials and enabling compact front-panel layout.

Use Scenario: Electricity meter logs consumption data every 15 minutes and emits short beep on successful GSM/GPRS transmission.

IC Role / Device Role / Timing Role: RTC provides precise time stamps for data packets; audio block plays 256 Hz tone only during active transmission window.

Use Value: Audio automatically disables in backup mode - preserves capacitor energy for timekeeping during mains outage.

Medical Infusion Pumps

Building Automation Controllers

Use Scenario: Pump alarms when infusion completes or occlusion occurs, with time-stamped event logging for compliance reporting.

IC Role / Device Role / Timing Role: RTC records exact time of alarm trigger; audio amplifier drives piezo transducer with calibrated 300 mW output.

Use Value: Meets IEC 60601-1 audible alarm requirements (SPL ≥ 65 dB at 10 cm) using single-chip solution with known THD+N performance.

Use Scenario: HVAC controller monitors room occupancy and triggers chime on schedule-based door unlock or CO₂ alert.

IC Role / Device Role / Timing Role: RTC manages daily schedules; audio section mixes sensor-triggered tone with background audio input (e.g., intercom feed).

Use Value: Inverting summing node allows simultaneous playback of pre-recorded voice prompt and real-time alert tone without external mixer.

Equivalent & Alternatives

The following parts are listed as comparable options for similar RTC-with-audio applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCF8563T/1,118 (NXP)	RTC-only; no audio amplifier or tone generator - requires external audio IC or buzzer driver.	Lacks integrated audio path; suitable only where alert generation is handled separately.	Select if audio functionality is unnecessary or already implemented elsewhere in system.
RV-3032-C3 (Epson)	Ultra-low-power RTC (0.25 µA backup); no audio section; includes digital temperature compensation.	Optimized for long-life battery operation without audible feedback; no tone or amplifier capability.	Choose when primary requirement is >10-year coin-cell lifetime and audio is irrelevant.

Compared with PCF8563T/1,118 and RV-3032-C3, the M41T00AUDD1F uniquely delivers timekeeping and regulated audio output in one DFN16 package - reducing component count, simplifying layout, and guaranteeing synchronized RTC/audio event timing without software coordination.

Availability

M41T00AUDD1F is available at Aetrix Electronics and suitable for industrial HMIs, smart energy meters, medical infusion pumps, and building automation controllers requiring stable component supply with guaranteed long-term availability.

Supply support for M41T00AUDD1F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader designing and manufacturing microcontrollers, analog ICs, and power management solutions for industrial, automotive, and consumer markets.

The M41T00AUDD1F belongs to ST's real-time clock product line, engineered specifically for embedded systems needing combined timekeeping and audible feedback in minimal footprint - targeting cost-sensitive, space-constrained applications where reliability and integration are critical.

FAQ

What is the function of the VBIAS pin?

VBIAS provides the internal DC bias reference for the audio input stage's inverting amplifier. It must be decoupled to ground with a 0.1 µF ceramic capacitor placed adjacent to the pin. This stabilizes the common-mode voltage at VDD/2, enabling full 1.6 V_P-P analog input swing without clipping or offset drift.

Can the M41T00AUDD1F operate with a 1.8 V supply?

No. The M41T00AUDD1F requires 3.0–3.6 V for normal operation. While timekeeping continues down to 1.7 V during backup mode, the audio amplifier, I²C interface, and register access are disabled below 2.8 V due to switchover activation. It is not rated or characterized for 1.8 V primary supply use.

How does the oscillator fail detect (OF) bit behave during crystal startup?

The OF bit remains cleared during normal crystal startup and only asserts after four consecutive 32.768 kHz cycles are missed - preventing false triggers during initial oscillation stabilization. Once set, OF stays asserted until cleared by firmware via the control register, and it does not auto-clear on crystal recovery.

Is the audio output capable of driving a standard 8 Ω speaker directly?

Yes. The differential AOUT+/AOUT– outputs deliver 300 mW into an 8 Ω load at THD+N ≤ 2% (1 kHz). For optimal performance, connect the speaker between AOUT+ and AOUT– with no DC blocking capacitor required, as the output is biased at VDD/2 and inherently balanced.

M41T00AUDD1F Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Audio, Leap Year, Trickle-Charger

Memory Size:: -

Time Format:: HH:MM:SS (24 hr)

Date Format:: YY-MM-DD-dd

Interface:: I2C, 2-Wire Serial

Voltage - Supply:: 3V ~ 3.6V

Voltage - Supply, Battery:: 1.7V ~ 3.6V

Current - Timekeeping (Max):: 14.3mA @ 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-DFN (5x4)

M41T00AUDD1F FAQ

1.How can I place an order for M41T00AUDD1F through Aetrix?

Please submit a Request for Quotation (RFQ) for M41T00AUDD1F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M41T00AUDD1F reliable?

The price and inventory of M41T00AUDD1F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M41T00AUDD1F is usually 5 days.

3.What payment methods are accepted for M41T00AUDD1F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M41T00AUDD1F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M41T00AUDD1F?

M41T00AUDD1F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M41T00AUDD1F order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M41T00AUDD1F?

For technical support, including M41T00AUDD1F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M41T00AUDD1F requirements.

6.How does Aetrix verify that M41T00AUDD1F is sourced from the original manufacturer or authorized distributors?

All M41T00AUDD1F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M41T00AUDD1F meets industry standards.

7.What is the process for return or replacement of M41T00AUDD1F?

All M41T00AUDD1F units undergo pre-shipment inspection (PSI). If there is an issue with M41T00AUDD1F, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M41T00AUDD1F part is unused and in its original packaging.

Return procedure for M41T00AUDD1F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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