M41T62:Low-power serial real-time clock (RTC) with alarm

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 (M41T62/64), programmable square wave output (M41T62/64), and watchdog output (M41T65). 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 x 3 mm 16-pin QFN which requires a user-supplied 32 KHz crystal, and an ultra-small 1.5 x 3.2 mm LCC with embedded crystal - no external crystal is required.

Key Features

  • Serial real-time clock (RTC) with alarm functions
    • 400 kHz I2 C 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 I2 C bus operating voltage
    • 4.4 V max VCC suitable for lithium-ion battery operation
  • Low operating current of 35 μA (at 400 kHz I2 C speed)
  • 32 KHz square wave output is on at power-up. Suitable for driving a microcontroller in low-power mode. Can be disabled. (M41T62/64)
  • Programmable 1 Hz to 32 KHz square wave output (M41T62/64)
  • 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 x 3 mm, lead-free & halogen-free (ECOPACK2® ) 16-lead QFN
    • Ultra-small 1.5 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)
产品规格
DescriptionVersionSize
DS3840: 具有报警功能的低功耗串行实时时钟(RTC)22.0920 KB
应用手册
DescriptionVersionSize
AN3060: 串行实时时钟(RTC)应用指南3.0453 KB
AN1011: ST NVRAM 和实时时钟(RTC)产品中使用的电池技术4.0416 KB
AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products4.1123 KB
AN1216: Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)2.0192 KB
AN4641: 集成TIMEKEEPER® 与实时时钟监控器功能1.0508 KB
AN923: Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs4.0142 KB
AN1572: 串行实时时钟(RTC)的掉电时间戳功能2.0394 KB
AN1336: Power-fail comparator for NVRAM supervisory devices2.0127 KB
手册
DescriptionVersionSize
Serial real-time clock ICs1.0827 KB
白皮书
DescriptionVersionSize
Smart watches and fitness bands benefit from the ultra-small date/time chip from STMicroelectronics1.0160 KB
Clocks and Timers Software
型号制造商Description
STSW-M41T62STPlatform-independent device driver for M41T62
STSW-SRTC001STI2C code for Serial RTC
STSW-SRTC002STSPI code -Serial RTC
解决方案评估工具
型号制造商Description
STEVAL-FET001V1STM41T62LC6F adapter board for a standard DIL 24 socket
样片和购买
型号PackagePacking TypeOperating Temperature (°C) (min)Operating Temperature (°C) (max)Unit Price (US$) *QuantityNVRAM size (B)ECCN (EU)ECCN (US)Country of Origin
M41T62LC6FLCC8 3.2x1.5 mmTape And Reel-40851.8191000-NECEAR99-
M41T62Q6FVFQFPN 16 3x3x0.9Tape And Reel-40850.8231000-NECEAR99MALAYSIA
质量和可靠性
型号PackageGradeRoHS Compliance GradeMaterial Declaration**
M41T62LC6FLCC8 3.2x1.5 mmIndustrialEcopack2md_a0dt-wspc-chip-wspc-carrier-wspc-ceramic-wspc-leadless-wspc-8l_amc2-wspc-sllaaal_vers2_sdm_signed.pdf
md_a0dt-wspc-chip-wspc-carrier-wspc-ceramic-wspc-leadless-wspc-8l_amc2-wspc-sllaaal_vers2_sdm.xml
M41T62Q6FVFQFPN 16 3x3x0.9IndustrialEcopack2md_zq_vfqfpn-wspc-3x3x0.9-wspc-1.7-wspc-16l_edzq-wspc-2lla262.pdf
具有报警功能的低功耗串行实时时钟(RTC) M41T65
circuit_diagram_10397_thumbnail.png M41T65
串行实时时钟(RTC)应用指南 M41T60
ST NVRAM 和实时时钟(RTC)产品中使用的电池技术 M4Z28-BR00SH
How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products M41T60
Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs) M41T94
集成TIMEKEEPER® 与实时时钟监控器功能 M41T60
Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs M41T60
串行实时时钟(RTC)的掉电时间戳功能 M41T60
Power-fail comparator for NVRAM supervisory devices M41T60
Predicting the battery life and data retention period of NVRAMs and serial RTCs M4T28-BR12SH
Power-fail comparator for NVRAM supervisory devices M41T62
md_a0dt-wspc-chip-wspc-carrier-wspc-ceramic-wspc-leadless-wspc-8l_amc2-wspc-sllaaal_vers2_sdm_signed.pdf M41T62
md_a0dt-wspc-chip-wspc-carrier-wspc-ceramic-wspc-leadless-wspc-8l_amc2-wspc-sllaaal_vers2_sdm.xml M41T62
md_zq_vfqfpn-wspc-3x3x0.9-wspc-1.7-wspc-16l_edzq-wspc-2lla262.pdf M41T62