STMicroelectronics M41T62LC6F

The M41T62LC6F is a low-power serial real-time clock (RTC) produced by STMicroelectronics. This device features a built-in 32.768 kHz oscillator and is designed for applications requiring precise timekeeping with minimal power consumption. The M41T62LC6F uses eight registers for the clock/calendar function, configured in binary-coded decimal (BCD) format, and an additional eight registers for status/control of alarm, 32 kHz output, calibration, and watchdog functions. Data is transferred serially via a two-line, bidirectional I²C interface.

The device is available in two compact package options: a 3 x 3 mm 16-pin QFN requiring a user-supplied 32 kHz crystal, and an ultra-small 1.5 x 3.2 mm LCC with an embedded crystal, eliminating the need for external oscillator components.

• 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
• Low operating current of 35 μA (at 400 kHz I²C speed)
• 32 kHz square wave output, 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 minutes timeout
• Software clock calibration, ±2 parts per million (±5 seconds per month)
• Automatic leap year compensation
• Lead-free and halogen-free (ECOPACK2) packages

The M41T62LC6F is suitable for a variety of applications requiring precise timekeeping and low power consumption, such as:

• Portable electronics (e.g., smartwatches, fitness trackers)
• Industrial control systems
• Automotive systems
• Medical devices
• IoT devices
• Battery-powered devices where low power consumption is critical

1. What is the primary function of the M41T62LC6F?

   The primary function of the M41T62LC6F is to serve as a low-power serial real-time clock (RTC) with alarm functions.

2. What interface does the M41T62LC6F use for data transfer?

   The M41T62LC6F uses a 400 kHz I²C serial interface for data transfer.

3. What are the package options available for the M41T62LC6F?

   The device is available in a 3 x 3 mm 16-pin QFN package requiring a user-supplied 32 kHz crystal, and an ultra-small 1.5 x 3.2 mm LCC package with an embedded crystal.

4. What is the operating voltage range of the M41T62LC6F?

   The operating voltage range of the M41T62LC6F is 1.3 V to 4.4 V.

5. Does the M41T62LC6F support programmable alarms?

   Yes, the M41T62LC6F supports programmable alarms with interrupt functions.

6. What is the accuracy of the software clock calibration?

   The software clock calibration can adjust timekeeping to within ±2 parts per million (±5 seconds per month).

7. Does the M41T62LC6F have a watchdog timer?

   Yes, the M41T62LC6F has an accurate programmable watchdog timer with a timeout range of 62.5 ms to 31 minutes.

8. What is the operating temperature range of the M41T62LC6F?

   The operating temperature range of the M41T62LC6F is –40 to +85 °C.

9. Is the M41T62LC6F suitable for battery-powered devices?

   Yes, the M41T62LC6F is highly suitable for battery-powered devices due to its low power consumption.

10. Does the M41T62LC6F support automatic leap year compensation?

    Yes, the M41T62LC6F supports automatic leap year compensation.

11. What are the environmental benefits of the M41T62LC6F packages?

    The packages of the M41T62LC6F are lead-free and halogen-free (ECOPACK2), making them environmentally friendly.