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Manufacturer Part #


M41T62 Series 4.4 V Serial Real-Time Clock (RTC) with 56 bytes NVRAM - QFN-16

ECAD Model:
Mfr. Name: STMicroelectronics
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Product Specification Section
Technical Attributes
Attributes Table
Date Format: DW:DM:M:Y
Time Format: HH:MM:SS
Interface: I2C / 2-Wire / Serial
Non-Volatile Memory Size: 16B
SRAM Size: 16b
Supply Voltage-Nom: 1.3V to 4.4V
Temperature Grade: Industrial
Operating Temp Range: -40°C to +85°C
Storage Temperature Range: -55°C to +125°C
Package Style:  QFN-16
Mounting Method: Surface Mount
Features & Applications

The M41T62Q6F is a part of M41T series I2C RTC. It has an operating temperature ranging from -40 °C to +85 °C and it comes in QFN-16 Packaging.

The M41T6x serial access TIMEKEEPER®is a low power serial 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 8 registers provide status/control of alarm, 32 KHz output, calibration, and watchdog functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.


  • Serial 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.
  • Programmable 1 Hz to 32 KHz square wave output
  • Programmable alarm with interrupt function
  • 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 16-lead QFN
    • Ultra-small 1.5 mm x 3.2 mm, Lead-free 8-pin ceramic leadless chip carrier with embedded 32 KHz crystal - no external oscillator components required (M41T62)
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