Overview
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.
Key Specifications
| Parameter | Value |
|---|---|
| Interface | 400 kHz I²C serial interface |
| Timekeeping Current | 350 nA at 3 V |
| Operating Voltage | 1.3 V to 4.4 V |
| Maximum Voltage | 4.4 V |
| Operating Temperature | –40 to +85 °C |
| Package Options | 3 x 3 mm 16-pin QFN, 1.5 x 3.2 mm 8-pin LCC with embedded crystal |
| Alarm Functions | Programmable alarm with interrupt function |
| 32 kHz Output | 32 kHz square wave output, programmable 1 Hz to 32 kHz square wave output |
| Watchdog Timer | Accurate programmable watchdog, 62.5 ms to 31 minutes timeout |
| Calibration | Software clock calibration, ±2 parts per million (±5 seconds per month) |
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
- 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
Applications
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
Q & A
- 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.
- What interface does the M41T62LC6F use for data transfer?
The M41T62LC6F uses a 400 kHz I²C serial interface for data transfer.
- 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.
- What is the operating voltage range of the M41T62LC6F?
The operating voltage range of the M41T62LC6F is 1.3 V to 4.4 V.
- Does the M41T62LC6F support programmable alarms?
Yes, the M41T62LC6F supports programmable alarms with interrupt functions.
- 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).
- 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.
- What is the operating temperature range of the M41T62LC6F?
The operating temperature range of the M41T62LC6F is –40 to +85 °C.
- Is the M41T62LC6F suitable for battery-powered devices?
Yes, the M41T62LC6F is highly suitable for battery-powered devices due to its low power consumption.
- Does the M41T62LC6F support automatic leap year compensation?
Yes, the M41T62LC6F supports automatic leap year compensation.
- 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.
