M41T82

Active

Serial I²C bus real-time clock (RTC) with battery switchover

Download datasheet Order Direct
Overview
Online design
Sample & Buy
Solutions
Documentation
CAD Resources
Tools & Software
Quality & Reliability
Partner products
Sales Briefcase

Product overview

Description

The M41T8x are low-power serial I2C real-time clocks (RTCs) with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 and SO8 packages, embedded crystal for the SOX18 package). Eight bytes of the register map (see Table 2 on page 23) are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM. Addresses and data are transferred serially via a two-line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T8x has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button battery when a power failure occurs.
Functions available to the user include a non-volatile, time-of-day clock/calendar, two alarm interrupts, watchdog timer, programmable 8-bit counter, and square wave outputs. The eight clock address locations contain the century, year, month, date, day, hour, minute, second, and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically. The M41T83 is supplied in either a QFN16 or an SOX18, 300 mil SOIC which includes an embedded 32 KHz crystal. The SOX18 package requires only a user-supplied battery to provide non-volatile operation. The M41T82 is available only in an SO8 package.
  • All features

    • Ultra-low battery supply current of 365 nA
    • Factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18)
      • Much better accuracies achievable using built-in programmable analog and digital calibration circuits
    • 2.0 V to 5.5 V clock operating voltage
    • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
    • Automatic switchover and reset output circuitry (fixed reference)
      • M41T83S: VCC= 3.00 V to 5.50 V
      • M41T83R: VCC= 2.70 V to 5.50 V
      • M41T83Z: VCC= 2.38 V to 5.50 V
    • Serial interface supports I2C bus (400 kHz protocol)
    • Programmable alarm with interrupt function (valid even during battery backup mode)
    • Optional 2ndprogrammable alarm available
    • Square wave output defaults to 32 KHz on power-up (M41T83 only)
    • RESET (RST) output
    • Watchdog timer
    • Programmable 8-bit counter/timer
    • 7 bytes of battery-backed user SRAM
    • Battery low flag
    • Low operating current of 80 μA
    • Oscillator stop detection
    • Battery or SuperCap™ backup
    • Operating temperature of –40 °C to 85 °C
    • Package options
      • a 16-lead QFN (M41T83)
      • an 8-lead SOIC (M41T82) or
      • an 18-lead embedded crystal SOIC (M41T83)
    • RoHS compliance: lead-free components are compliant with the RoHS directive

Circuit Diagram

You might also like...

Recommended for you

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      STSW-SRTC001

      Active

      I2C code for Serial RTC

      Clocks and Timers Software ST
      STSW-SRTC001

      Description:

      I2C code for Serial RTC

      STSW-SRTC002

      Active

      SPI code -Serial RTC

      Clocks and Timers Software ST
      STSW-SRTC002

      Description:

      SPI code -Serial RTC
    • Part number
      Status
      Description
      Type
      Supplier

      RTC 9 Click

      Active

      RTC 9 Click is a real-time clock module that has an extremely low power consumption, allowing it to be used with a single button cell battery, for an extended period of time.

      Components and Modules MikroElektronika
      RTC 9 Click

      Description:

      RTC 9 Click is a real-time clock module that has an extremely low power consumption, allowing it to be used with a single button cell battery, for an extended period of time.

EDA Symbols, Footprints and 3D Models

STMicroelectronics - M41T82

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Symbols

Symbols

Footprints

Footprints

3D model

3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T82RM6F
Active
SO-8 Industrial Ecopack1
M41T82SM6F
Active
SO-8 Industrial Ecopack1
M41T82ZM6F
Active
SO-8 Industrial Ecopack1

M41T82RM6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T82SM6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T82ZM6F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) 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.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Budgetary Price (US$)*/Qty
More info
min
max
M41T82ZM6F Available at 3 distributors

Distributor availability ofM41T82ZM6F

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 104 0 Order Now
MOUSER WORLDWIDE 29 1 Order Now
Farnell Element14 EUROPE 2317 1 Order Now

Distributor reported inventory date: 2021-09-29

Distributor Name

Newark Element14

Stock

104

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

29

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2317

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-29

Buy Direct
Active
EAR99 NEC Tape And Reel SO-8 -40 85 1.1891 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

MOROCCO

M41T82RM6F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape And Reel SO-8 -40 85 1.1891 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

MOROCCO

M41T82SM6F Available at 2 distributors

Distributor availability ofM41T82SM6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 11 1 Order Now
Farnell Element14 EUROPE 41 1 Order Now

Distributor reported inventory date: 2021-09-29

Distributor Name

DIGIKEY

Stock

11

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

41

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-29

Active
EAR99 NEC Tape And Reel SO-8 -40 85 1.081 / 1k
MORE INFO

NVRAM size (B):

7

Country of Origin:

MOROCCO

M41T82ZM6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.1891 / 1k

Distributor availability ofM41T82ZM6F

Distributor Name
Region Stock Min. Order Third party link
Newark Element14 AMERICA 104 0 Order Now
MOUSER WORLDWIDE 29 1 Order Now
Farnell Element14 EUROPE 2317 1 Order Now

Distributor reported inventory date: 2021-09-29

Distributor Name

Newark Element14

Stock

104

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

29

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2317

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-29

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.1891 / 1k

NVRAM size (B)

7

Country of Origin

MOROCCO

M41T82RM6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.1891 / 1k

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.1891 / 1k

NVRAM size (B)

7

Country of Origin

MOROCCO

M41T82SM6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.081 / 1k

Distributor availability ofM41T82SM6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 11 1 Order Now
Farnell Element14 EUROPE 41 1 Order Now

Distributor reported inventory date: 2021-09-29

Distributor Name

DIGIKEY

Stock

11

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

41

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-29

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.081 / 1k

NVRAM size (B)

7

Country of Origin

MOROCCO

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