M41T62
Serial real-time clock (RTC) with alarm-
Active
The M41T6x is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator. Eight registers are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional eight registers provide status/control of alarm, 32 KHz output, calibration, and watchdog functions. 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.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts (M41T62/65), 32 KHz output (M41T62/63/64), programmable square wave output (M41T62/63/64), and watchdog output (M41T63/65). 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 M41T6x is supplied in two very small packages: a tiny, 3 mm x 3 mm 16-pin QFN which requires a user-supplied 32 KHz crystal, and an ultra-small 1.5 mm x 3.2 mm LCC with embedded crystal - no external crystal is required.
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Datasheet
Key Features
- Serial real-time clock (RTC) with alarm functions
400 kHz I2C serial interface Memory mapped registers for seconds, minutes, hours, day, date, month, year, and century Tenths/hundredths of seconds register - 350 nA timekeeping current at 3 V
- Timekeeping down to 1.0 V
- 1.3 V to 4.4 V I2C bus operating voltage
4.4 V max VCCsuitable for lithium-ion battery operation - Low operating current of 35 μA (at 400 kHz)
- 32 KHz square wave output is on at power-up. Suitable for driving a microcontroller in low-power mode. Can be disabled. (M41T62/63/64)
- Programmable 1 Hz to 32 KHz square wave output (M41T62/63/64)
- Programmable alarm with interrupt function (M41T62/65)
- 32 KHz crystal oscillator integrates crystal load capacitors, works with high series resistance crystals
- Oscillator stop detection monitors clock operation
- Accurate programmable watchdog
62.5 ms to 31 min timeout - Software clock calibration. Can adjust timekeeping to within ±2 parts per million (±5 seconds per month)
- Automatic leap year compensation
- –40 to +85 °C operation
- Two package options:
Very small 3 mm x 3 mm, lead-free & halogen-free (ECOPACK2®) 16-lead QFN Ultra-small 1.5 mm x 3.2 mm, lead-free & halogen-free (ECOPACK2®) 8-pin ceramic leadless chip carrier with embedded 32 KHz crystal - no external oscillator components required (M41T62)
Circuit Diagram
Design Resources
TopTechnical Documentation
Product Specifications
| Description | Version | Size |
|---|---|---|
DS3840: Low-power serial real-time clocks (RTCs) with alarm
|
20.0 | 1,755 KB |
|
DB0641: RTC dongle demonstration board based on the M41T62 and ST72651AR6
|
1.1 | 90 KB |
Application Notes
| Description | Version | Size |
|---|---|---|
|
AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST
|
4.0 | 248 KB |
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AN1572: Power-down time-stamp function in serial real-time clocks (RTCs)
|
2.0 | 171 KB |
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AN1879: How to use M41ST87 tamper detect and RAM clear
|
4.2 | 70 KB |
|
AN3060: Applications guide for serial real-time clocks (RTCs)
|
2.0 | 355 KB |
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AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
|
4.1 | 123 KB |
Technical Notes & Articles
| Description | Version | Size |
|---|---|---|
|
TA0344: Highly accurate, automatic temperature-compensated real-time clock (RTC) solution
|
1.0 | 251 KB |
Related Tools and Software
Related Tools and Software
| Part Number | Description |
|---|---|
| STEVAL-SCM001V1 | RTC dongle demonstration board based on the M41T62 and ST72651AR6 |
Publications and Collaterals
Brochure
| Description | Version | Size |
|---|---|---|
|
Serial real-time clock (RTC) ICs
|
1.0.0 | 2,329 KB |
Sample & Buy
Top| Part Number | Marketing Status | Package | Packing Type | Operating Temperature (min) | Operating Temperature (max) | NVRAM size | Automotive Grade | Order From ST | Unit Price (US$)* @ | Distributor Availability | RoHS Compliance Grade | Download Material Declaration** |
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| M41T62LC6F | Active | LCC8 3.2x1.5 mm | Tape And Reel | -40 | 85 | _ |
| Ecopack2 | - | |||||||||||||||||||||||||||||||||||||||||||
| M41T62Q6F | Active | VFQFPN 16 3x3x0.9 | Tape And Reel | -40 | 85 | _ |
| Ecopack2 | PDF XML | |||||||||||||||||||||||||||||||||||||||||||
(*) 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 (**) 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. |
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