M41T82SM6F Real-Time Clock (RTC) ICs by STMicroelectronics

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

Status: Active
Series: M41T82
RoHS: Compliant
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The M41T8x are low-power serial I 2 C 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 I 2 C 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.

Prices starting from US$1.75


Distributor Starting From Stock
Logo for Farnell Farnell US$1.81
4,760
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Logo for Newark Electronics Newark Electronics US$2.42
4,760
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Logo for element14 element14 US$2.13
4,760
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Logo for Future Electronics Future Electronics US$1.75
2,500
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Logo for Avnet Silica Avnet Silica -
80,000
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Logo for Avnet America Avnet America US$1.88
-
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Logo for EBV Elektronik EBV Elektronik -
-
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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
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
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)
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

Resources


Application Notes
AN3060 Applications guide for serial real-time clocks (RTCs)
AN1011 Battery technology used in NVRAM and real-time clock (RTC) products from ST
AN2678 Extremely accurate timekeeping over temperature using adaptive calibration
AN934 How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
AN1216 Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)
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


Alternative Descriptions

ALARM RTC, 32B, I2C, 5.5V, SOIC-8 | Farnell
Alarm Rtc, 32B, I2C, 5.5V, Soic-8 | Newark Electronics
STMicroelectronics, M41T82SM6F | RS
M41T82 Series 3 to 5.5 V Battery Switchover Serial I2C RTC - SOIC-8 | Future Electronics
Real Time Clock Serial 32Byte 8-Pin SO N T/R | Avnet Silica


Frequently Asked Questions

Where can I find additional details, specifications and documents for a M41T82SM6F?

Additional datasheets, footprints and schematics for M41T82SM6F are listed on our Part Details page. You can also find images and similar parts to M41T82SM6F on this page.

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What category does M41T82SM6F fall under?

The M41T82SM6F is listed under Clocks and Timers > Real-Time Clock (RTC) ICs > RTC - Serial Interface.

Can I view similar or alternative parts?

You can view similar parts to M41T82SM6F when available in the RTC - Serial Interface range under the specifications section at the bottom of the details page.

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Is the M41T82SM6F RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

Which authorised distributors for M41T82SM6F have stock available?

Authorised distributors including Farnell, Newark Electronics, element14, RS and Future Electronics have stock available or on a lead time for M41T82SM6F.

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